研究者詳細 - 江口　潤

論文 - 江口　潤

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HOMA-beta independently predicts survival in patients with advanced cancer on treatment with immune checkpoint inhibitors 査読

Mayu Watanabe, Jun Eguchi, Atsushi Takamoto, Hiromitsu Kanzaki, Yohei Noda, Syunsuke Kagawa, Jun Wada

15 2024年12月

Plasma angiotensin-converting enzyme 2 (ACE2) is a marker for renal outcome of diabetic kidney disease (DKD) (U-CARE study 3). 国際誌

Asami Ueno, Yasuhiro Onishi, Koki Mise, Satoshi Yamaguchi, Ayaka Kanno, Ichiro Nojima, Chigusa Higuchi, Haruhito A Uchida, Kenichi Shikata, Satoshi Miyamoto, Atsuko Nakatsuka, Jun Eguchi, Kazuyuki Hida, Akihiro Katayama, Mayu Watanabe, Tatsuaki Nakato, Atsuhito Tone, Sanae Teshigawara, Takashi Matsuoka, Shinji Kamei, Kazutoshi Murakami, Ikki Shimizu, Katsuhito Miyashita, Shinichiro Ando, Tomokazu Nunoue, Jun Wada

BMJ open diabetes research & care 12 ( 3 ) 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

INTRODUCTION: ACE cleaves angiotensin I (Ang I) to angiotensin II (Ang II) inducing vasoconstriction via Ang II type 1 (AT1) receptor, while ACE2 cleaves Ang II to Ang (1-7) causing vasodilatation by acting on the Mas receptor. In diabetic kidney disease (DKD), it is still unclear whether plasma or urine ACE2 levels predict renal outcomes or not. RESEARCH DESIGN AND METHODS: Among 777 participants with diabetes enrolled in the Urinary biomarker for Continuous And Rapid progression of diabetic nEphropathy study, the 296 patients followed up for 9 years were investigated. Plasma and urinary ACE2 levels were measured by the ELISA. The primary end point was a composite of a decrease of estimated glomerular filtration rate (eGFR) by at least 30% from baseline or initiation of hemodialysis or peritoneal dialysis. The secondary end points were a 30% increase or a 30% decrease in albumin-to-creatinine ratio from baseline to 1 year. RESULTS: The cumulative incidence of the renal composite outcome was significantly higher in group 1 with lowest tertile of plasma ACE2 (p=0.040). Group 2 with middle and highest tertile was associated with better renal outcomes in the crude Cox regression model adjusted by age and sex (HR 0.56, 95% CI 0.31 to 0.99, p=0.047). Plasma ACE2 levels demonstrated a significant association with 30% decrease in ACR (OR 1.46, 95% CI 1.044 to 2.035, p=0.027) after adjusting for age, sex, systolic blood pressure, hemoglobin A1c, and eGFR. CONCLUSIONS: Higher baseline plasma ACE2 levels in DKD were protective for development and progression of albuminuria and associated with fewer renal end points, suggesting plasma ACE2 may be used as a prognosis marker of DKD. TRIAL REGISTRATION NUMBER: UMIN000011525.

DOI： 10.1136/bmjdrc-2024-004237

Reduced Immunogenicity of COVID-19 Vaccine in Obese Patients with Type 2 Diabetes: A Cross-Sectional Study.

Hiroko Takahashi, Jun Eguchi, Mayu Watanabe, Masanori Nakayama, Jun Wada

Acta medica Okayama 78 ( 2 ) 185 - 191 2024年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

The global pandemic of coronavirus infection 2019 (COVID-19) was an unprecedented public health emergency. Several clinical studies reported that heart disease, lung disease, diabetes, hypertension, dyslipidemia, and obesity are critical risk factors for increased severity of and hospitalization for COVID-19. This is largely because patients with these underlying medical conditions can show poor immune responses to the COVID-19 vaccinations. Diabetes is one of the underlying conditions most highly associated with COVID-19 susceptibility and is considered a predictor of poor prognosis of COVID-19. We therefore investigated factors that influence the anti-SARS-CoV-2 spike IgG antibody titer after three doses of vaccination in patients with type 2 diabetes. We found that obesity was associated with low anti-SARS-CoV-2 spike IgG antibody titers following three-dose vaccination in type 2 diabetics. Obese patients with type 2 diabetes may have attenuated vaccine efficacy and require additional vaccination; continuous infection control should be considered in such patients.

DOI： 10.18926/AMO/66927

Inhibition of Amino Acids Influx into Proximal Tubular Cells Improves Lysosome Function in Diabetes. 国際誌

Yuzuki Kano, Satoshi Yamaguchi, Koki Mise, Chieko Kawakita, Yasuhiro Onishi, Naoko Kurooka, Ryosuke Sugawara, Haya Hamed Hassan Albuayjan, Atsuko Nakatsuka, Jun Eguchi, Jun Wada

Kidney360 2023年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Inhibition of glucose influx into proximal tubular cells (PTCs) by sodium-glucose co-transporter 2 (SGLT2) inhibitors revealed prominent therapeutic impacts on diabetic kidney disease (DKD). Collectrin (CLTRN) serves as a chaperone for the trafficking of neutral amino acid transporters in the apical membranes of proximal tubular cells. We investigated the beneficial effects of reduced influx of amino acids into proximal tubular cells in diabetes and obesity model of Cltrn-/y mice. METHODS: Cltrn+/y and Cltrn-/y mice at 5 weeks of age were assigned to standard diet- (STD) and streptozotocin and high fat diet-treated (STZ-HFD) groups. RESULTS: At 22-23 weeks of age, body weight and HbA1c levels significantly increased in STZ-HFD-Cltrn+/y compared to STD-Cltrn+/y; however, they were not altered in STZ-HFD-Cltrn-/y compared to STZ-HFD-Cltrn+/y. At 20 weeks of age, urinary albumin creatinine ratio (UACR) was significantly reduced in STZ-HFD-Cltrn-/y compared to STZ-HFD-Cltrn+/y. Under the treatments with STZ and HFD, the Cltrn gene deficiency caused significant increase in urinary concentration of amino acids such as Gln, His, Gly, Thr, Tyr, Val, Trp, Phe, Ile, Leu and Pro. In proximal tubular cells in STZ-HFD-Cltrn+/y, the enlarged lysosomes with diameter of 10 μm or more were associated with reduced autolysosomes, and the formation of giant lysosomes was prominently suppressed in STZ-HFD-Cltrn-/y. Phospho-mTOR and inactive form of phospho-TFEB were reduced in STZ-HFD-Cltrn-/y compared to STZ-HFD-Cltrn+/y. CONCLUSIONS: The reduction of amino acids influx into proximal tubular cells inactivated mTOR, activated TFEB, improved lysosome function, and ameliorated vacuolar formation of PTCs in STZ-HFD-Cltrn-/y mice.

DOI： 10.34067/KID.0000000000000333

Role of glycosylphosphatidylinositol-anchored high-density lipoprotein binding protein 1 in hypertriglyceridemia and diabetes.

Naoko Kurooka, Jun Eguchi, Jun Wada

Journal of diabetes investigation 14 ( 10 ) 1148 - 1156 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

In diabetes, the impairment of insulin secretion and insulin resistance contribute to hypertriglyceridemia, as the enzymatic activity of lipoprotein lipase (LPL) depends on insulin action. The transport of LPL to endothelial cells and its enzymatic activity are maintained by the formation of lipolytic complex depending on the multiple positive (glycosylphosphatidylinositol-anchored high-density lipoprotein binding protein 1 [GPIHBP1], apolipoprotein C-II [APOC2], APOA5, heparan sulfate proteoglycan [HSPG], lipase maturation factor 1 [LFM1] and sel-1 suppressor of lin-12-like [SEL1L]) and negative regulators (APOC1, APOC3, angiopoietin-like proteins [ANGPTL]3, ANGPTL4 and ANGPTL8). Among the regulators, GPIHBP1 is a crucial molecule for the translocation of LPL from parenchymal cells to the luminal surface of capillary endothelial cells, and maintenance of lipolytic activity; that is, hydrolyzation of triglyceride into free fatty acids and monoglyceride, and conversion from chylomicron to chylomicron remnant in the exogenous pathway and from very low-density lipoprotein to low-density lipoprotein in the endogenous pathway. The null mutation of GPIHBP1 causes severe hypertriglyceridemia and pancreatitis, and GPIGBP1 autoantibody syndrome also causes severe hypertriglyceridemia and recurrent episodes of acute pancreatitis. In patients with type 2 diabetes, the elevated serum triglyceride levels negatively correlate with circulating LPL levels, and positively with circulating APOC1, APOC3, ANGPTL3, ANGPTL4 and ANGPTL8 levels. In contrast, circulating GPIHBP1 levels are not altered in type 2 diabetes patients with higher serum triglyceride levels, whereas they are elevated in type 2 diabetes patients with diabetic retinopathy and nephropathy. The circulating regulators of lipolytic complex might be new biomarkers for lipid and glucose metabolism, and diabetic vascular complications.

DOI： 10.1111/jdi.14056

肥満・脂肪細胞・インスリン抵抗性 2型糖尿病,肥満症におけるmicroRNAの機能解析

和田淳, 大井祐貴子, 黒岡直子, 菅原亮佑, 宮本聡, 中司敦子, 江口潤, 四方賢一

糖尿病合併症 37 ( Suppl.1 ) 188 - 188 2023年9月

【指定難病Up to Date】家族性低βリポタンパク血症に関する最近の知見

江口潤, 和田淳

岡山医学会雑誌 135 ( 2 ) 81 - 84 2023年8月

Brown Adipose Tissue PPARγ Is Required for the Insulin-Sensitizing Action of Thiazolidinediones.

Yusuke Shibata, Jun Eguchi, Jun Wada

Acta medica Okayama 77 ( 3 ) 243 - 254 2023年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

Brown adipose tissue (BAT) plays a critical role in metabolic homeostasis. BAT dysfunction is associated with the development of obesity through an imbalance between energy expenditure and energy intake. The nuclear receptor peroxisome proliferator-activated receptor gamma (PPARγ) is the master regulator of adipogenesis. However, the roles of PPARγ and thiazolidinediones (TZDs) in the regulation of BAT metabolism remain unclear. TZDs, which are selective PPARγ activators, improve systemic insulin resistance in animals and humans. In the present study, we generated brown adipocyte-specific PPARγ-deficient mice (BATγKO) to examine the in vivo roles of PPARγ and TZDs in BAT metabolism. In electron microscopic examinations, brown adipocyte-specific PPARγ deletion promoted severe whitening of brown fat and morphological alteration of mitochondria. Brown adipocyte-specific PPARγ deletion also reduced mRNA expression of BATselective genes. Although there was no difference in energy expenditure between control and BATγKO mice in calorimetry, norepinephrine-induced thermogenesis was impaired in BATγKO mice. Moreover, pioglitazone treatment improved diet-induced insulin resistance in the control mice but not in the BATγKO mice. These findings suggest that BAT PPARγ is necessary for the maintenance of brown adipocyte function and for the insulin-sensitizing action of TZDs.

DOI： 10.18926/AMO/65489

マジンドール(Mazindol:MZD)先行導入後に腹腔鏡下スリーブ胃切除術を行った高度肥満の2例

賀島肇, 菊地覚次, 香川俊輔, 江口潤, 中司敦子, 高橋絢子, 黒田新士, 半澤俊哉, 庄司良平, 垣内慶彦, 松三雄騎, 野間和広, 楳田祐三, 和田淳, 藤原俊義

肥満研究 28 ( Suppl. ) 352 - 352 2022年11月

腹腔鏡下スリーブ状胃切除(LSG)の安全な導入と普及への課題

菊地覚次, 賀島肇, 香川俊輔, 江口潤, 中司敦子, 高橋絢子, 黒田新士, 半澤俊哉, 庄司良平, 垣内慶彦, 松三雄騎, 野間和広, 楳田祐三, 和田淳, 藤原俊義

肥満研究 28 ( Suppl. ) 354 - 354 2022年11月

Roles of Transmembrane Protein 97 (TMEM97) in Adipose Tissue and Skeletal Muscle.

Masafumi Tenta, Jun Eguchi, Jun Wada

Acta medica Okayama 76 ( 3 ) 235 - 245 2022年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

The combination of sarcopenia and obesity (sarcopenic obesity) is associated with the development of metabolic syndrome and cardiovascular events. The molecular pathways that develop sarcopenic obesity have studied intensively. Transmembrane protein 97 (TMEM97) is 176 amino acids conserved integral membrane protein with four transmembrane domains that is expressed in several types of cancer. Its physiological significance in adipose tissue and skeletal muscle has been unclear. We studied TMEM97-transgenic mice and mice lacking TMEM97, and our findings indicate that TMEM97 expression is regulated in adipose tissue and skeletal muscle from obesity. TMEM97 represses adipogenesis and promotes myogenesis in vitro. Fat-specific TMEM97 transgenic mice showed systemic insulin resistance. Mice overexpressing TMEM97 in skeletal muscle exhibited systemic insulin resistance. Mice lacking TMEM97 were protected against diet-induced obesity and insulin resistance. These phenotypes are associated with the effects of TMEM97 on inflammation genes in adipose tissue and skeletal muscle. Our findings indicates that there is a link between TMEM97 and chronic inflammation in obesity.

DOI： 10.18926/AMO/63717

Circulating GPIHBP1 levels and microvascular complications in patients with type 2 diabetes: A cross-sectional study. 国際誌

Naoko Kurooka, Jun Eguchi, Kazutoshi Murakami, Shinji Kamei, Toru Kikutsuji, Sakiko Sasaki, Akiho Seki, Satoshi Yamaguchi, Ichiro Nojima, Mayu Watanabe, Chigusa Higuchi, Akihiro Katayama, Haruhito A Uchida, Atsuko Nakatsuka, Kenichi Shikata, Jun Wada

Journal of clinical lipidology 16 ( 2 ) 237 - 245 2022年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Glycosylphosphatidylinositol-anchored high-density lipoprotein binding protein 1 (GPIHBP1) plays a crucial role in lipolytic processing. Previous studies have shown that GPIHBP1 mutations cause severe hypertriglyceridemia and that serum GPIHBP1 levels are marginally higher in patients with coronary heart disease; however, the role of GPIHBP1 in type 2 diabetes mellitus (T2DM) remains unknown. OBJECTIVE: We investigated the association between circulating GPIHBP1 levels and the prevalence of microvascular complications in T2DM. METHODS: A total of 237 subjects with T2DM and 235 non-diabetic control subjects were enrolled in this study. Their serum GPIHBP1 levels were evaluated using ELISA assays. RESULTS: Circulating GPIHBP1 levels were higher in patients with T2DM (952.7 pg/mL [761.3-1234.6], p < 0.0001) than in non-diabetic subjects (700.6 [570.8-829.6]), but did not differ in T2DM patients with or without hypertriglyceridemia. Serum GPIHBP1 levels were significantly higher in patients with T2DM with diabetic retinopathy (DR), diabetic nephropathy (DN), and microvascular complications than in those without these complications. Multivariable logistic regression and receiver operating characteristic (ROC) curve analyses revealed that the presence of microvascular complications, but not macrovascular complications, was independently associated with serum GPIHBP1 levels, which could predict the presence of diabetic microvascular complications. CONCLUSIONS: Elevated GPIHBP1 levels are associated with microvascular complications in T2DM and may help to predict their progression.

DOI： 10.1016/j.jacl.2022.01.006

The Association of Postprandial Triglyceride Variability with Renal Dysfunction and Microalbuminuria in Patients with Type 2 Diabetic Mellitus: A Retrospective and Observational Study. 国際誌

Natsumi Matsuoka-Uchiyama, Haruhito A Uchida, Shugo Okamoto, Yasuhiro Onishi, Katsuyoshi Katayama, Mariko Tsuchida-Nishiwaki, Hidemi Takeuchi, Rika Takemoto, Yoshiko Hada, Ryoko Umebayashi, Naoko Kurooka, Kenji Tsuji, Jun Eguchi, Hirofumi Nakajima, Kenichi Shikata, Jun Wada

Journal of diabetes research 2022 3157841 - 3157841 2022年

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: We examined whether or not day-to-day variations in lipid profiles, especially triglyceride (TG) variability, were associated with the exacerbation of diabetic kidney disease. METHODS: We conducted a retrospective and observational study. First, 527 patients with type 2 diabetes mellitus (DM) who had had their estimated glomerular filtration rate (eGFR) checked every 6 months since 2012 for over 5 years were registered. Variability in postprandial TG was determined using the standard deviation (SD), SD adjusted (Adj-SD) for the number of measurements, and maximum minus minimum difference (MMD) during the first three years of follow-up. The endpoint was a ≥40% decline from baseline in the eGFR, initiation of dialysis or death. Next, 181 patients who had no micro- or macroalbuminuria in February 2013 were selected from among the 527 patients for an analysis. The endpoint was the incidence of microalbuminuria, initiation of dialysis, or death. RESULTS: Among the 527 participants, 110 reached a ≥40% decline from baseline in the eGFR or death. The renal survival was lower in the higher-SD, higher-Adj-SD, and higher-MMD groups than in the lower-SD, lower-Adj-SD, and lower-MMD groups, respectively (log-rank test p = 0.0073, 0.0059, and 0.0195, respectively). A lower SD, lower Adj-SD, and lower MMD were significantly associated with the renal survival in the adjusted model (hazard ratio, 1.62, 1.66, 1.59; 95% confidence intervals, 1.05-2.53, 1.08-2.58, 1.04-2.47, respectively). Next, among 181 participants, 108 developed microalbuminuria or death. The nonincidence of microalbuminuria was lower in the higher-SD, higher-Adj-SD, and higher-MMD groups than in the lower-SD, lower-Adj-SD, and lower-MMD groups, respectively (log-rank test p = 0.0241, 0.0352, and 0.0474, respectively). CONCLUSIONS: Postprandial TG variability is a novel risk factor for eGFR decline and the incidence of microalbuminuria in patients with type 2 DM.

DOI： 10.1155/2022/3157841

Adipocyte-specific inhibition of Mir221/222 ameliorates diet-induced obesity through targeting Ddit4 査読

Satoshi Yamaguchi, Dongxiao Zhang, Akihiro Katayama, Naoko Kurooka, Ryosuke Sugawara, Haya H. Albuayjan, Atsuko Nakatsuka, Jun Eguchi and Jun Wada

Frontiers in Endocrinology 2021年12月

Author Correction: Lgals9 deficiency ameliorates obesity by modulating redox state of PRDX2 (Scientific Reports, (2021), 11, 1, (5991), 10.1038/s41598-021-85080-1)

Tomokazu Nunoue, Satoshi Yamaguchi, Sanae Teshigawara, Akihiro Katayama, Atsuko Nakatsuka, Jun Eguchi, Toshiro Niki, Jun Wada

Scientific Reports 11 ( 1 ) 2021年12月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：Nature Research

The original version of this Article contained errors. In Figure 5, the size marker gel image was mistakenly placed in Panel (e). The original Figure 5 and accompanying legend appear below. Additionally in Supplementary Figure 4 and 5, the panel labels and corresponding red boxes for uncropped images were omitted. The original Supplementary Information 1 file is provided below. The original Article and accompanying Supplementary Information 1 file have been corrected. (Figure presented.).

DOI： 10.1038/s41598-021-98293-1

耐糖能異常妊婦における妊娠後期・分娩直後・産後2ヵ月でのインスリン分泌能の変化

渡邉真由, 牧尉太, 衛藤英理子, 江口潤, 増山寿, 和田淳

糖尿病と妊娠 21 ( 3 ) S - 103 2021年11月

Longitudinal observation of insulin secretory ability before and after the onset of immune checkpoint inhibitor-induced diabetes mellitus: A report of two cases. 国際誌

Noriko Fujiwara, Mayu Watanabe, Akihiro Katayama, Yohei Noda, Jun Eguchi, Hitomi Kataoka, Shunsuke Kagawa, Jun Wada

Clinical case reports 9 ( 9 ) e04574 2021年9月

A Vaspin-HSPA1L complex protects proximal tubular cells from organelle stress in diabetic kidney disease. 国際誌

Atsuko Nakatsuka, Satoshi Yamaguchi, Jun Eguchi, Shigeru Kakuta, Yoichiro Iwakura, Hitoshi Sugiyama, Jun Wada

Communications biology 4 ( 1 ) 373 - 373 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

Proximal tubular cells (PTCs) are crucial for maintaining renal homeostasis, and tubular injuries contribute to progression of diabetic kidney disease (DKD). However, the roles of visceral adipose tissue-derived serine protease inhibitor (vaspin) in the development of DKD is not known. We found vaspin maintains PTCs through ameliorating ER stress, autophagy impairment, and lysosome dysfunction in DKD. Vaspin-/- obese mice showed enlarged and leaky lysosomes in PTCs associated with increased apoptosis, and these abnormalities were also observed in the patients with DKD. During internalization into PTCs, vaspin formed a complex with heat shock protein family A (Hsp70) member 1 like (HSPA1L) as well as 78 kDa glucose-regulated protein (GRP78). Both vaspin-partners bind to clathrin heavy chain and involve in the endocytosis. Notably, albumin-overload enhanced extracellular release of HSPA1L and overexpression of HSPA1L dissolved organelle stresses, especially autophagy impairment. Thus, vapsin/HSPA1L-mediated pathways play critical roles in maintaining organellar function of PTCs in DKD.

DOI： 10.1038/s42003-021-01902-y

Lgals9 deficiency ameliorates obesity by modulating redox state of PRDX2. 国際誌

Tomokazu Nunoue, Satoshi Yamaguchi, Sanae Teshigawara, Akihiro Katayama, Atsuko Nakatsuka, Jun Eguchi, Toshiro Niki, Jun Wada

Scientific reports 11 ( 1 ) 5991 - 5991 2021年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

The adipose tissue is regarded as an endocrine organ and secretes bioactive adipokines modulating chronic inflammation and oxidative stress in obesity. Gal-9 is secreted out upon cell injuries, interacts with T-cell immunoglobulin-3 (Tim-3) and induces apoptosis in activated Th1 cells. Gal-9 also binds to protein disulfide isomerase (PDI), maintains PDI on surface of T cells, and increases free thiols in the disulfide/thiol cycles. To explore the molecular mechanism of obesity, we investigated Gal-9-/- and Gal-9wt/wt C57BL/6J mice fed with high fat-high sucrose (HFHS) chow. Gal-9-/- mice were resistant to diet-induced obesity associated with reduction of epididymal and mesenteric fat tissues and improved glucose tolerance compared with Gal-9wt/wt mice. However, the number of M1, M2 macrophages, and M1/M2 ratio in epididymal fat were unaltered. Under HFHS chow, Gal-9-/- mice receiving Gal-9-/- or Gal-9wt/wt bone marrow-derived cells (BMCs) demonstrated significantly lower body weight compared with Gal-9wt/wt mice receiving Gal-9-/- BMCs. We identified the binding between Gal-9 and peroxiredoxin-2 (PRDX2) in sugar chain-independent manner by nanoLC-MS/MS, immunoprecipitation, and pull-down assay. In 3T3L1 adipocytes, Gal-9 knockdown shifts PRDX2 monomer (reduced form) dominant from PRDX2 dimer (oxidized form) under oxidative stress with H2O2. The inhibition of Gal-9 in adipocytes may be a new therapeutic approach targeting the oxidative stress and subsequent glucose intolerance in obesity.

DOI： 10.1038/s41598-021-85080-1

Novel Urinary Glycan Biomarkers Predict Cardiovascular Events in Patients With Type 2 Diabetes: A Multicenter Prospective Study With 5-Year Follow Up (U-CARE Study 2). 国際誌

Koki Mise, Mariko Imamura, Satoshi Yamaguchi, Mayu Watanabe, Chigusa Higuchi, Akihiro Katayama, Satoshi Miyamoto, Haruhito A Uchida, Atsuko Nakatsuka, Jun Eguchi, Kazuyuki Hida, Tatsuaki Nakato, Atsuhito Tone, Sanae Teshigawara, Takashi Matsuoka, Shinji Kamei, Kazutoshi Murakami, Ikki Shimizu, Katsuhiro Miyashita, Shinichiro Ando, Tomokazu Nunoue, Michihiro Yoshida, Masao Yamada, Kenichi Shikata, Jun Wada

Frontiers in cardiovascular medicine 8 668059 - 668059 2021年

記述言語：英語掲載種別：研究論文（学術雑誌）

Background: Although various biomarkers predict cardiovascular event (CVE) in patients with diabetes, the relationship of urinary glycan profile with CVE in patients with diabetes remains unclear. Methods: Among 680 patients with type 2 diabetes, we examined the baseline urinary glycan signals binding to 45 lectins with different specificities. Primary outcome was defined as CVE including cardiovascular disease, stroke, and peripheral arterial disease. Results: During approximately a 5-year follow-up period, 62 patients reached the endpoint. Cox proportional hazards analysis revealed that urinary glycan signals binding to two lectins were significantly associated with the outcome after adjustment for known indicators of CVE and for false discovery rate, as well as increased model fitness. Hazard ratios for these lectins (+1 SD for the glycan index) were UDA (recognizing glycan: mixture of Man5 to Man9): 1.78 (95% CI: 1.24-2.55, P = 0.002) and Calsepa [High-Man (Man2-6)]: 1.56 (1.19-2.04, P = 0.001). Common glycan binding to these lectins was high-mannose type of N-glycans. Moreover, adding glycan index for UDA to a model including known confounders improved the outcome prediction [Difference of Harrel's C-index: 0.028 (95% CI: 0.001-0.055, P = 0.044), net reclassification improvement at 5-year risk increased by 0.368 (0.045-0.692, P = 0.026), and the Akaike information criterion and Bayesian information criterion decreased from 725.7 to 716.5, and 761.8 to 757.2, respectively]. Conclusion: The urinary excretion of high-mannose glycan may be a valuable biomarker for improving prediction of CVE in patients with type 2 diabetes, and provides the rationale to explore the mechanism underlying abnormal N-glycosylation occurring in patients with diabetes at higher risk of CVE. Trial Registration: This study was registered with the University Hospital Medical Information Network on June 26, 2012 (Clinical trial number: UMIN000011525, URL: https://upload.umin.ac.jp/cgi-open-bin/ctr_e/ctr_view.cgi?recptno=R000013482).

DOI： 10.3389/fcvm.2021.668059

Upregulation of Mir342 in Diet-Induced Obesity Mouse and the Hypothalamic Appetite Control. 国際誌

Dongxiao Zhang, Satoshi Yamaguchi, Xinhao Zhang, Boxuan Yang, Naoko Kurooka, Ryosuke Sugawara, Haya Hamed H Albuayjan, Atsuko Nakatsuka, Jun Eguchi, Takeshi Y Hiyama, Atsunori Kamiya, Jun Wada

Frontiers in endocrinology 12 727915 - 727915 2021年

記述言語：英語掲載種別：研究論文（学術雑誌）

In obesity and type 2 diabetes, numerous genes are differentially expressed, and microRNAs are involved in transcriptional regulation of target mRNAs, but miRNAs critically involved in the appetite control are not known. Here, we identified upregulation of miR-342-3p and its host gene Evl in brain and adipose tissues in C57BL/6 mice fed with high fat-high sucrose (HFHS) chow by RNA sequencing. Mir342 (-/-) mice fed with HFHS chow were protected from obesity and diabetes. The hypothalamic arcuate nucleus neurons co-express Mir342 and EVL. The percentage of activated NPY+pSTAT3+ neurons were reduced, while POMC+pSTAT3+ neurons increased in Mir342 (-/-) mice, and they demonstrated the reduction of food intake and amelioration of metabolic phenotypes. Snap25 was identified as a major target gene of miR-342-3p and the reduced expression of Snap25 may link to functional impairment hypothalamic neurons and excess of food intake. The inhibition of miR-342-3p may be a potential candidate for miRNA-based therapy.

DOI： 10.3389/fendo.2021.727915

Roles of transmembrane Protein 97 (TMEM97) in Adipose Tissue and Skeletal Muscle 査読

Masafumi Tenta, Jun Eguchi, and Jun Wada

Acta Medica Okayama 2021年

Adipocyte-Specific Inhibition of Mir221/222 Ameliorates Diet-Induced Obesity Through Targeting Ddit4. 国際誌

Satoshi Yamaguchi, Dongxiao Zhang, Akihiro Katayama, Naoko Kurooka, Ryosuke Sugawara, Haya Hamed Hassan Albuayjan, Atsuko Nakatsuka, Jun Eguchi, Jun Wada

Frontiers in endocrinology 12 750261 - 750261 2021年

記述言語：英語掲載種別：研究論文（学術雑誌）

MicroRNAs expressed in adipocytes are involved in transcriptional regulation of target mRNAs in obesity, but miRNAs critically involved in this process is not well characterized. Here, we identified upregulation of miR-221-3p and miR-222-3p in the white adipose tissues in C57BL/6 mice fed with high fat-high sucrose (HFHS) chow by RNA sequencing. Mir221 and Mir222 are paralogous genes and share the common seed sequence and Mir221/222AdipoKO mice fed with HFHS chow demonstrated resistance to the development of obesity compared with Mir221/222flox/y . Ddit4 is a direct target of Mir221 and Mir222, and the upregulation of Ddit4 in Mir221/222AdipoKO was associated with the suppression of TSC2 (tuberous sclerosis complex 2)/mammalian target of rapamycin complex 1 (mTORC1)/S6K (ribosomal protein S6 kinase) pathway. The overexpression of miR-222-3p linked to enhanced adipogenesis, and it may be a potential candidate for miRNA-based therapy.

DOI： 10.3389/fendo.2021.750261

Medication adherence in patients with type 2 diabetes: Investigations for association of medication Adherence and Glycemic Control

Naoko Kurooka, Jun Eguchi, Mari Ashida, Michiko Nakajima, Jun Wada, Hirofumi Nakajima

Journal of the Japan Diabetes Society 63 ( 9 ) 609 - 617 2020年9月

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Japan Diabetes Society

[AIM] Medication adherence is closely related to glycemic control in type 2 diabetes patients. To evaluate the association of medication adherence with glycemic control in type 2 diabetes patients, we investigated the adherence rate and degree of adherence required to achieve a certain treatment goal. [METHODS] A self-assessment questionnaire survey was conducted in 1022 patients recruited from among hospital outpatients. The medication adherence rate and degree were assessed by self-reported data. The medication adherence score evaluated the medication adherence degree on a scale of 1 to 5 (1=often, 2=sometimes, 3=occasionally, 4 =almost never, 5=never). The medication adherence rate evaluated the percentage of medicines used. [RESULTS] Seventy-five percent of patients were considered adherent to their medication. Female sex, age &gt
70 years old and 1 dose daily were significantly associated with medication adherence. Furthermore, a !95 % adherence rate was related to a hemoglobin A1c &lt
7.0 %. An adherence rate of 95 % matched an adherence score of 4. [CONCLUSION] The present study showed that female subjects, those &gt
70 years old and those with once-daily medication were more adherent to their medication than others. A more than 95 % medication adherence rate is required to achieve therapeutic goals in type 2 diabetes patients.

DOI： 10.11213/tonyobyo.63.609

Dysfunction of CD8 + PD-1 + T cells in type 2 diabetes caused by the impairment of metabolism-immune axis. 国際誌

Ichiro Nojima, Shingo Eikawa, Nahoko Tomonobu, Yoshiko Hada, Nobuo Kajitani, Sanae Teshigawara, Satoshi Miyamoto, Atsuhito Tone, Haruhito A Uchida, Atsuko Nakatsuka, Jun Eguchi, Kenichi Shikata, Heiichiro Udono, Jun Wada

Scientific reports 10 ( 1 ) 14928 - 14928 2020年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

The metabolic changes and dysfunction in CD8 + T cells may be involved in tumor progression and susceptibility to virus infection in type 2 diabetes (T2D). In C57BL/6JJcl mice fed with high fat-high sucrose chow (HFS), multifunctionality of CD8 + splenic and tumor-infiltrating lymphocytes (TILs) was impaired and associated with enhanced tumor growth, which were inhibited by metformin. In CD8 + splenic T cells from the HFS mice, glycolysis/basal respiration ratio was significantly reduced and reversed by metformin. In the patients with T2D (DM), multifunctionality of circulating CD8 + PD-1 + T cells stimulated with PMA/ionomycin as well as with HLA-A*24:02 CMV peptide was dampened, while metformin recovered multifunctionality. Both glycolysis and basal respiration were reduced in DM, and glycolysis was increased by metformin. The disturbance of the link between metabolism and immune function in CD8 + PD-1 + T cells in T2D was proved by recovery of antigen-specific and non-specific cytokine production via metformin-mediated increase in glycolytic activity.

DOI： 10.1038/s41598-020-71946-3

The hypoglycemia-prevention effect of sensor-augmented pump therapy with predictive low glucose management in Japanese patients with type 1 diabetes mellitus: a short-term study.

Akihiro Katayama, Atsuhito Tone, Mayu Watanabe, Sanae Teshigawara, Satoshi Miyamoto, Jun Eguchi, Atsuko Nakatsuka, Kenichi Shikata, Jun Wada

Diabetology international 11 ( 2 ) 97 - 104 2020年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

Aims/introduction: The predictive low glucose management (PLGM) system was introduced in March 2018 in Japan. Although there are some reports demonstrating the benefit of PLGM in preventing hypoglycemia, no data are currently available in Japanese patients with type 1 diabetes mellitus (T1DM). The aim of the present study is to evaluate the effect of PLGM with sensor-augmented pump therapy in the prevention of hypoglycemia in Japanese patients. Materials and methods: We included 16 patients with T1DM who used the MiniMed®640G system after switching from the MiniMed®620G system. We retrospectively analysed the data of the continuous glucose monitoring system in 1 month after switching to MiniMed®640G. Results: The area under the curve (AUC) of hypoglycemia of < 70 mg/dL was lowered from 0.42 ± 0.43 mg/dL day to 0.18 ± 0.18 mg/dL day (P = 0.012). Correspondingly, the duration of severe hypoglycemia (< 54 mg/dL) was reduced significantly from 15.3 ± 21.7 min/day to 4.8 ± 6.9 min/day (P = 0.019). The duration of hypoglycemia was reduced, but the reduction was not significant. Regarding the AUC for hyperglycemia > 180 mg/dL and the duration of hyperglycemia did not change. With the PLGM function, 79.3% of the predicted hypoglycemic events were avoided. Conclusions: The hypoglycemia avoidance rate was comparable to those in previous reports. In addition, we demonstrated that PLGM can markedly suppress severe hypoglycemia without deteriorating glycemic control in Japanese T1DM patients. It is necessary to further investigate the effective use of the PLGM feature such as establishing a lower limit and the timing of resumption.

DOI： 10.1007/s13340-019-00408-7

A Patient with Type 3 Autoimmune Polyglandular Syndrome who Developed Systemic Lupus Erythematosus 8 years after the Diagnosis of Autoimmune Hepatitis.

Tomoyo Mifune-Morioka, Haruhito A Uchida, Kazuhiko Fukushima, Mayu Watanabe, Chihiro Ouchi, Koki Mise, Chieko Kawakita, Yuzuki Kano, Akifumi Onishi, Kishio Toma, Jun Eguchi, Nozomu Wada, Fusao Ikeda, Erika Sasaki, Yu Suganami, Masayuki Kishida, Hitoshi Sugiyama, Hiroyuki Okada, Jun Wada

Acta medica Okayama 73 ( 4 ) 367 - 372 2019年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

Eight years prior to her present admission, a 61-year-old Japanese woman was diagnosed with autoimmune hepatitis, slowly progressive insulin-dependent diabetes mellitus, and chronic thyroiditis; she had been treated with oral prednisolone (PSL). After she suddenly discontinued PSL, she newly developed systemic lupus erythematosus. A combination therapy of oral PSL and intravenous cyclophosphamide resulted in remission. She was finally diagnosed with autoimmune polyglandular syndrome (APS) type 3 (3A ,3B, 3D), complicated with four different autoimmune diseases. Since patients with type 3 APS may present many manifestations over a long period of time, they should be carefully monitored.

DOI： 10.18926/AMO/56940

Fetuin-Aの糖尿病腎症進展における役割

三瀬広記, 中司敦子, 山口哲志, 勅使川原早苗, 田邊克幸, 江口潤, 和田淳

糖尿病 62 ( Suppl.1 ) S - 202 2019年4月

Effect of an enhanced recovery after surgery protocol in patients undergoing pancreaticoduodenectomy: A randomized controlled trial. 国際誌

Kosei Takagi, Ryuichi Yoshida, Takahito Yagi, Yuzo Umeda, Daisuke Nobuoka, Takashi Kuise, Shiro Hinotsu, Takashi Matsusaki, Hiroshi Morimatsu, Jun Eguchi, Jun Wada, Masuo Senda, Toshiyoshi Fujiwara

Clinical nutrition (Edinburgh, Scotland) 38 ( 1 ) 174 - 181 2019年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND & AIMS: Evidence of the advantages of enhanced recovery after surgery (ERAS) protocols following pancreaticoduodenectomy (PD) is limited. The aim of this study was to examine the efficiency of ERAS protocols in patients following PD. METHODS: Between June 2014 and October 2016, patients undergoing PD were randomly assigned to receive ERAS protocols or standard care. The primary endpoint was the postoperative length of stay. Secondary endpoints included postoperative complications, postoperative quality-of-life (QoR-40J), readmission, and medical cost. RESULTS: Of 80 eligible patients, 74 were analyzed in intention-to-treat principles: 37 in the control group and 37 in the ERAS group. The mean length of stay in the ERAS group was significantly shorter than that in the control group (20.1 ± 5.4 vs 26.9 ± 13.5 days, P < 0.001). The ERAS group had a significantly lower percentage of postoperative complications (32.4% vs 56.8%, P = 0.034) and readmissions (0% vs 8.1%, P = 0.038). Quality-of-life was also significantly better in the ERAS group (184 ± 12.4 vs 177 ± 14.5, P = 0.022). The total medical cost was lower in the ERAS group, but not significantly ($25,445 ± 5065 vs $28,384 ± 9999, P = 0.085). CONCLUSIONS: The optimization of ERAS protocols in patients undergoing PD is safe and accelerates perioperative recovery and quality-of-life, thereby reducing the length of stay. Morbidity was significantly decreased in the ERAS group without compromising surgical outcome. REGISTRATION NUMBER: UMIN000014068.

DOI： 10.1016/j.clnu.2018.01.002

2型糖尿病患者における尿中糖鎖排泄量と腎・心血管イベントおよび総死亡との関連の検討査読

今村麻理子, 三瀬広記, 中塔辰明, 清水一紀, 安藤晋一郎, 松岡孝, 宮下雄博, 肥田和之, 江口潤, 中司敦子, 四方賢一, 和田淳

糖尿病 62 ( 2 ) 113 - 113 2019年2月

GPIHBP1 autoantibody syndrome during interferon β1a treatment 査読

Jun Eguchi, Kazuya Miyashita, Isamu Fukamachi, Katsuyuki Nakajima, Masami Murakami, Yuko Kawahara, Toru Yamashita, Yasuyuki Ohta, Koji Abe, Atsuko Nakatsuka, Mai Mino, Satoru Takase, Hiroaki Okazaki, Robert A. Hegele, Michael Ploug, Xuchen Hu, Jun Wada, Stephen G. Young, Anne P. Beigneux

Journal of Clinical Lipidology 13 ( 1 ) 62 - 69 2019年

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：ELSEVIER SCIENCE INC

© 2018 National Lipid Association Background: Autoantibodies against glycosylphosphatidylinositol-anchored high-density lipoprotein–binding protein 1 (GPIHBP1) cause chylomicronemia by blocking the ability of GPIHBP1 to bind lipoprotein lipase (LPL) and transport the enzyme to its site of action in the capillary lumen. Objective: A patient with multiple sclerosis developed chylomicronemia during interferon (IFN) β1a therapy. The chylomicronemia resolved when the IFN β1a therapy was discontinued. Here, we sought to determine whether the drug-induced chylomicronemia was caused by GPIHBP1 autoantibodies. Methods: We tested plasma samples collected during and after IFN β1a therapy for GPIHBP1 autoantibodies (by western blotting and with enzyme-linked immunosorbent assays). We also tested whether the patient's plasma blocked the binding of LPL to GPIHBP1 on GPIHBP1-expressing cells. Results: During IFN β1a therapy, the plasma contained GPIHBP1 autoantibodies, and those autoantibodies blocked GPIHBP1's ability to bind LPL. Thus, the chylomicronemia was because of the GPIHBP1 autoantibody syndrome. Consistent with that diagnosis, the plasma levels of GPIHBP1 and LPL were very low. After IFN β1a therapy was stopped, the plasma triglyceride levels returned to normal, and GPIHBP1 autoantibodies were undetectable. Conclusion: The appearance of GPIHBP1 autoantibodies during IFN β1a therapy caused chylomicronemia. The GPIHBP1 autoantibodies disappeared when the IFN β1a therapy was stopped, and the plasma triglyceride levels fell within the normal range.

DOI： 10.1016/j.jacl.2018.10.004

A retrospective observational study on the effects of switching from conventional insulin pump to sensor-augmented pump (SAP) therapy

Satoshi Yamaguchi, Atsuhito Tone, Sanae Teshigawara, Mayu Watanabe, Akihiro Katayama, Satoshi Miyamoto, Jun Eguchi, Atsuko Nakatsuka, Chigusa Higuchi, Daisuke Ogawa, Kenichi Shikata, Jun Wada

Journal of the Japan Diabetes Society 62 ( 5 ) 315 - 321 2019年

記述言語：日本語掲載種別：研究論文（学術雑誌）出版者・発行元：Japan Diabetes Society

The purpose of this retrospective observational study is to analyze the clinical course of sensor augmented pump (SAP) therapy after switching from insulin pump therapy and to evaluate the predictors of the therapeutic effects of SAP therapy. Twenty-two type 1 diabetes patients who received SAP therapy for more than one year after switching from insulin pump therapy were enrolled. HbAlc levels were unchanged at 6 months and significantly improved at 12 months. The HbAlc levels at 6 months were decreased in 14 patients and unchanged or increased in the other 8 patients. In the latter group with unchanged or increased HbAlc levels at 6 months, the mean HbAlc level at the induction of SAP therapy was significantly lower and the percentage of patients with SMBG &lt
70 mg/dL before SAP therapy was higher in comparison to the former group. A multiple regression analysis showed a significant negative correlation between the change in % TBD (6M) and the change in the HbAlc level (6M). Conclusively, in patients with frequent hypoglycemia, we should evaluate the therapeutic effects based on various parameters, such as average sensor glucose levels and AUC &lt
70 mg/dL, since it is possible that the HbAlc level may transiently increase after the induction of SAP therapy in such cases.

DOI： 10.11213/tonyobyo.62.315

Acquired partial lipoatrophy as graft-versus-host disease and treatment with metreleptin: two case reports. 国際誌

Yusuke Shibata, Atsuko Nakatsuka, Jun Eguchi, Satoshi Miyamoto, Yukari Masuda, Motoharu Awazawa, Akinobu Takaki, Ryuichi Yoshida, Takahito Yagi, Jun Wada

Journal of medical case reports 12 ( 1 ) 368 - 368 2018年12月

記述言語：英語掲載種別：研究論文（学術雑誌）

INTRODUCTION: Acquired partial lipoatrophy has been reported after bone marrow transplantation during childhood; however, no adult cases have previously been reported. We herein report two adult cases of acquired partial lipoatrophy after transplantation. CASE PRESENTATION: A 28-year-old Japanese woman developed diabetic ketoacidosis and received insulin therapy after bone marrow transplantation. She manifested partial lipoatrophy of the extremities, prominent insulin resistance, hyperglycemia, hypertriglyceridemia, and fatty liver. A 40-year-old Japanese woman underwent liver transplantation from a living donor for alcoholic liver disease after abstinence from alcohol. She newly developed non-alcoholic steatohepatitis and diabetes. Non-alcoholic steatohepatitis progressed to liver failure, and a second liver transplantation from a brain-dead donor was performed at 42 years of age. She demonstrated loss of subdermal fat of the upper and lower extremities, prominent insulin resistance, hyperglycemia, and hypertriglyceridemia. In both cases, the injection of recombinant methionyl human leptin reversed all of the metabolic abnormalities. CONCLUSIONS: Acquired partial lipoatrophy after transplantation is a manifestation of chronic graft-versus-host disease in adults. This entity is associated with diabetes with prominent insulin resistance and severe hypertriglycemia and can be successfully treated with metreleptin for the long term.

DOI： 10.1186/s13256-018-1901-y

Renal expression of trefoil factor 3 mRNA in association with tubulointerstitial fibrosis in IgA nephropathy. 国際誌

Keiko Tanaka, Hitoshi Sugiyama, Toshio Yamanari, Koki Mise, Hiroshi Morinaga, Masashi Kitagawa, Akifumi Onishi, Ayu Ogawa-Akiyama, Katsuyuki Tanabe, Jun Eguchi, Yasukazu Ohmoto, Kenichi Shikata, Jun Wada

Nephrology (Carlton, Vic.) 23 ( 9 ) 855 - 862 2018年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

AIM: Trefoil factor 3 (TFF3) is a small peptide that is involved in mucosal protection. TFF3 is widely expressed in multiple tissues including kidney tissue. Previous studies have reported that the levels of urinary TFF3 are significantly increased in patients with chronic kidney disease. The aim of this study is to detect the TFF3 mRNA in kidney and elucidate the relationship between renal TFF3 mRNA and tubulointerstitial fibrosis in IgA nephropathy (IgAN). METHODS: We investigated the renal mRNA expression of TFF3 by real-time PCR analysis in biopsy specimens from patients with IgAN, other glomerulonephritis (OGN) and minor glomerular abnormalities (MGA). We also determined the renal localization of TFF3 and the levels of urinary TFF3 by immunostaining and ELISA, respectively. RESULTS: The renal TFF3 mRNA expression was significantly associated with the urinary TFF3 secretion and the tubulointerstitial fibrosis score in the IgAN group alone. Immunostaining of the renal specimen of IgAN patients revealed that TFF3 is located in the renal tubular epithelial cells. The locations were almost the same as those that showed uromodulin positivity; specifically, the thick ascending limb (TAL) of the loop of Henle and the early portion of the distal tubule. The urinary TFF3 levels were positively correlated with the levels of urinary biomarkers of tubulointerstitial injury in such patients. CONCLUSION: Renal TFF3 mRNA is associated with renal tubulointerstitial fibrosis in IgAN patients. The TFF3 located in the renal tubular epithelial cells may play a role in the progression of tubulointerstitial fibrosis in IgAN patients.

DOI： 10.1111/nep.13444

Identification of Novel Urinary Biomarkers for Predicting Renal Prognosis in Patients With Type 2 Diabetes by Glycan Profiling in a Multicenter Prospective Cohort Study: U-CARE Study 1. 国際誌

Koki Mise, Mariko Imamura, Satoshi Yamaguchi, Sanae Teshigawara, Atsuhito Tone, Haruhito A Uchida, Jun Eguchi, Atsuko Nakatsuka, Daisuke Ogawa, Michihiro Yoshida, Masao Yamada, Kenichi Shikata, Jun Wada

Diabetes care 41 ( 8 ) 1765 - 1775 2018年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: Because quantifying glycans with complex structures is technically challenging, little is known about the association of glycosylation profiles with the renal prognosis in diabetic kidney disease (DKD). RESEARCH DESIGN AND METHODS: In 675 patients with type 2 diabetes, we assessed the baseline urinary glycan signals binding to 45 lectins with different specificities. The end point was a decrease of estimated glomerular filtration rate (eGFR) by ≥30% from baseline or dialysis for end-stage renal disease. RESULTS: During a median follow-up of 4.0 years, 63 patients reached the end point. Cox proportional hazards analysis revealed that urinary levels of glycans binding to six lectins were significantly associated with the outcome after adjustment for known indicators of DKD, although these urinary glycans, except that for DBA, were highly correlated with baseline albuminuria and eGFR. Hazard ratios for these lectins were (+1 SD for the glycan index) as follows: SNA (recognizing glycan Siaα2-6Gal/GalNAc), 1.42 (95% CI 1.14-1.76); RCA120 (Galβ4GlcNAc), 1.28 (1.01-1.64); DBA (GalNAcα3GalNAc), 0.80 (0.64-0.997); ABA (Galβ3GalNAc), 1.29 (1.02-1.64); Jacalin (Galβ3GalNAc), 1.30 (1.02-1.67); and ACA (Galβ3GalNAc), 1.32 (1.04-1.67). Adding these glycan indexes to a model containing known indicators of progression improved prediction of the outcome (net reclassification improvement increased by 0.51 [0.22-0.80], relative integrated discrimination improvement increased by 0.18 [0.01-0.35], and the Akaike information criterion decreased from 296 to 287). CONCLUSIONS: The urinary glycan profile identified in this study may be useful for predicting renal prognosis in patients with type 2 diabetes. Additional investigation of glycosylation changes and urinary glycan excretion in DKD is needed.

DOI： 10.2337/dc18-0030

1型糖尿病合併妊婦における妊娠期間中の体重変化とインスリン所要量の検討

勅使川原早苗, 利根淳仁, 山口哲志, 渡邉真由, 三瀬広記, 野島一郎, 高橋寛子, 柴田祐介, 中司敦子, 江口潤, 和田淳

糖尿病 61 ( Suppl.1 ) S - 311 2018年4月

当院における免疫チェックポイント阻害薬による副作用(耐糖能異常および甲状腺機能異常)の検討

渡邉真由, 有木沙織, 山口哲志, 樋口千草, 勅使川原早苗, 宮本聡, 利根淳仁, 中司敦子, 江口潤, 四方賢一, 和田淳

糖尿病 61 ( Suppl.1 ) S - 255 2018年4月

糖尿病患者における糖鎖プロファイリングによる腎予後予測因子の同定

三瀬広記, 今村麻里子, 山口哲志, 勅使川原早苗, 江口潤, 中司敦子, 山田雅雄, 和田淳

糖尿病 60 ( Suppl.1 ) S - 261 2017年4月

メタボリックシンドロームおけるガレクチン-9の意義

勅使川原早苗, 布上朋和, 山口哲志, 三瀬広記, 柴田祐助, 高橋寛子, 野島一郎, 利根敦仁, 江口潤, 中司敦子, 和田淳

糖尿病 60 ( Suppl.1 ) S - 376 2017年4月

肥満・糖尿病による近位尿細管細胞障害とvaspinの細胞保護作用機序の解明

中司敦子, 山口哲志, 柴田祐助, 高橋寛子, 三瀬広記, 勅使川原早苗, 江口潤, 和田淳

糖尿病 60 ( Suppl.1 ) S - 259 2017年4月

SAP療法の治療反応性を予見する患者像の検討

利根淳仁, 勅使川原早苗, 宮本聡, 江口潤, 中司敦子, 樋口千草, 小川大輔, 四方賢一, 和田淳

糖尿病 60 ( Suppl.1 ) S - 390 2017年4月

Marked hypertriglyceridemia induced by interferon-β1a therapy in a clinically isolated syndrome patient. 国際誌

Yuko Kawahara, Toru Yamashita, Yasuyuki Ohta, Kota Sato, Keiichiro Tsunoda, Mami Takemoto, Nozomi Hishikawa, Jun Eguchi, Koji Abe

Journal of the neurological sciences 373 144 - 146 2017年2月

IRF3 promotes adipose inflammation and insulin resistance and represses browning. 国際誌

Manju Kumari, Xun Wang, Louise Lantier, Anna Lyubetskaya, Jun Eguchi, Sona Kang, Danielle Tenen, Hyun Cheol Roh, Xingxing Kong, Lawrence Kazak, Rasheed Ahmad, Evan D Rosen

The Journal of clinical investigation 126 ( 8 ) 2839 - 54 2016年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

The chronic inflammatory state that accompanies obesity is a major contributor to insulin resistance and other dysfunctional adaptations in adipose tissue. Cellular and secreted factors promote the inflammatory milieu of obesity, but the transcriptional pathways that drive these processes are not well described. Although the canonical inflammatory transcription factor NF-κB is considered to be the major driver of adipocyte inflammation, members of the interferon regulatory factor (IRF) family may also play a role in this process. Here, we determined that IRF3 expression is upregulated in the adipocytes of obese mice and humans. Signaling through TLR3 and TLR4, which lie upstream of IRF3, induced insulin resistance in murine adipocytes, while IRF3 knockdown prevented insulin resistance. Furthermore, improved insulin sensitivity in IRF3-deficient mice was associated with reductions in intra-adipose and systemic inflammation in the high fat-fed state, enhanced browning of subcutaneous fat, and increased adipose expression of GLUT4. Taken together, the data indicate that IRF3 is a major transcriptional regulator of adipose inflammation and is involved in maintaining systemic glucose and energy homeostasis.

DOI： 10.1172/JCI86080

Inhibition of SGLT2 alleviates diabetic nephropathy by suppressing high glucose-induced oxidative stress in type 1 diabetic mice. 国際誌

Takashi Hatanaka, Daisuke Ogawa, Hiromi Tachibana, Jun Eguchi, Tatsuyuki Inoue, Hiroshi Yamada, Kohji Takei, Hirofumi Makino, Jun Wada

Pharmacology research & perspectives 4 ( 4 ) e00239 2016年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

It is unclear whether the improvement in diabetic nephropathy by sodium glucose cotransporter 2 (SGLT2) inhibitors is caused by a direct effect on SGLT2 or by the improvement in hyperglycemia. Here, we investigated the effect of dapagliflozin on early-stage diabetic nephropathy using a mouse model of type 1 diabetes and murine proximal tubular epithelial cells. Eight-week-old Akita mice were treated with dapagliflozin or insulin for 12 weeks. Body weight, urinary albumin excretion, blood pressure, as well as levels of blood glucose and hemoglobin A1c were measured. Expansion of the mesangial matrix, interstitial fibrosis, and macrophage infiltration in kidneys were evaluated by histology. Oxidative stress and apoptosis were evaluated in kidneys and cultured proximal tubular epithelial cells. Compared with nontreated mice, dapagliflozin and insulin decreased blood glucose and hemoglobin A1c levels equally. Urine volume and water intake increased significantly in the dapagliflozin-treated group compared with those in the insulin-treated group, but there were no differences in body weight or blood pressure between the two groups. Macrophage infiltration and fibrosis in renal interstitium improved significantly in the dapagliflozin group compared with the insulin group. Oxidative stress was attenuated by dapagliflozin, and suppression occurred in a dose-dependent manner. RNAi knockdown of SGLT2 resulted in reduced oxidative stress. Dapagliflozin ameliorates diabetic nephropathy by suppressing hyperglycemia-induced oxidative stress in a manner independent of hyperglycemia improvement in Akita mice. Our findings suggest that dapagliflozin may be a novel therapeutic approach for the treatment of diabetic nephropathy.

DOI： 10.1002/prp2.239

Antiobesity Action of ACAM by Modulating the Dynamics of Cell Adhesion and Actin Polymerization in Adipocytes. 国際誌

Kazutoshi Murakami, Jun Eguchi, Kazuyuki Hida, Atsuko Nakatsuka, Akihiro Katayama, Miwa Sakurai, Haruki Choshi, Masumi Furutani, Daisuke Ogawa, Kohji Takei, Fumio Otsuka, Jun Wada

Diabetes 65 ( 5 ) 1255 - 67 2016年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

Coxsackie virus and adenovirus receptor-like membrane protein (CLMP) was identified as the tight junction-associated transmembrane protein of epithelial cells with homophilic binding activities. CLMP is also recognized as adipocyte adhesion molecule (ACAM), and it is upregulated in mature adipocytes in rodents and humans with obesity. Here, we present that aP2 promoter-driven ACAM transgenic mice are protected from obesity and diabetes with the prominent reduction of adipose tissue mass and smaller size of adipocytes. ACAM is abundantly expressed on plasma membrane of mature adipocytes and associated with formation of phalloidin-positive polymerized form of cortical actin (F-actin). By electron microscopy, the structure of zonula adherens with an intercellular space of ∼10-20 nm was observed with strict parallelism of the adjoining cell membranes over distances of 1-20 μm, where ACAM and γ-actin are abundantly expressed. The formation of zonula adherens may increase the mechanical strength, inhibit the adipocyte hypertrophy, and improve the insulin sensitivity.

DOI： 10.2337/db15-1304

糖尿病性腎症におけるVaspinの意義

中司敦子, 三瀬広記, 江口潤, 和田淳

日本腎臓学会誌 58 ( 3 ) 262 - 262 2016年5月

Insufficiency of phosphatidylethanolamine N-methyltransferase is risk for lean non-alcoholic steatohepatitis. 国際誌

Atsuko Nakatsuka, Makoto Matsuyama, Satoshi Yamaguchi, Akihiro Katayama, Jun Eguchi, Kazutoshi Murakami, Sanae Teshigawara, Daisuke Ogawa, Nozomu Wada, Tetsuya Yasunaka, Fusao Ikeda, Akinobu Takaki, Eijiro Watanabe, Jun Wada

Scientific reports 6 21721 - 21721 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

Although obesity is undoubtedly major risk for non-alcoholic steatohepatitis (NASH), the presence of lean NASH patients with normal body mass index has been recognized. Here, we report that the insufficiency of phosphatidylethanolamine N-methyltransferase (PEMT) is a risk for the lean NASH. The Pemt-/- mice fed high fat-high sucrose (HFHS) diet were protected from diet-induced obesity and diabetes, while they demonstrated prominent steatohepatitis and developed multiple liver tumors. Pemt exerted inhibitory effects on p53-driven transcription by forming the complex with clathrin heavy chain and p53, and Pemt-/- mice fed HFHS diet demonstrated prominent apoptosis of hepatocytes. Furthermore, hypermethylation and suppressed mRNA expression of F-box protein 31 and hepatocyte nuclear factor 4α resulted in the prominent activation of cyclin D1. PEMT mRNA expression in liver tissues of NASH patients was significantly lower than those with simple steatosis and we postulated the distinct clinical entity of lean NASH with insufficiency of PEMT activities.

DOI： 10.1038/srep21721

The gender specific risk factors for prolonged hospitalization due to acute pyelonephritis in a Japanese tertiary emergency center. 国際誌

Risa Muneishi, Ryuta Tanimoto, Koichiro Wada, Philip Hsiao, Jun Eguchi, Motoo Araki, Toyohiko Watanabe, Yasutomo Nasu, Naoki Akebi

Journal of infection and chemotherapy : official journal of the Japan Society of Chemotherapy 22 ( 2 ) 108 - 11 2016年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVES: The aim of this study is to characterize the potential differences between male and female patients with acute pyelonephritis (AP) and to predict the severity of AP based on the length of hospital stay. METHODS: We conducted a retrospective medical chart review of 172 consecutive adult patients who were hospitalized in Tsuyama Central Hospital due to AP from January 2007 through June 2012. We analyzed the length of hospital stay by the proportional hazard model. RESULTS: A total of 172 patients were identified who were admitted to our hospital with a diagnosis of AP. Of them, 62% (106/172) were female. Except for urological malignancy, there was no significant difference between men and women in underlying disease. Out of 26 variables, univariate analysis in male showed that only urolithiasis (OR 1.75, p = 0.0294) was significantly associated with longer hospital stay, while septic shock (OR 3.18, P = 0.003), urological malignancy (OR 2.94, P = 0.002), age over 65 (OR 1.66, p = 0.018) and neurogenic bladder (OR 1.92, p = 0.014) were all associated with longer hospital stay in female patients. CONCLUSIONS: This is the first report to identify the risk factors for prolonged hospital stay for the patients who were admitted with AP in the Japanese population. The risk factors causing prolonged hospital stay were totally different between males and females. Reviewing the medical history based on sex gender might enable a clinician to predict the severity of acute pyelonephritis during the initial evaluation.

DOI： 10.1016/j.jiac.2015.11.007

Beneficial impact of Gpnmb and its significance as a biomarker in nonalcoholic steatohepatitis. 国際誌

Akihiro Katayama, Atsuko Nakatsuka, Jun Eguchi, Kazutoshi Murakami, Sanae Teshigawara, Motoko Kanzaki, Tomokazu Nunoue, Kazuyuki Hida, Nozomu Wada, Tetsuya Yasunaka, Fusao Ikeda, Akinobu Takaki, Kazuhide Yamamoto, Hiroshi Kiyonari, Hirofumi Makino, Jun Wada

Scientific reports 5 16920 - 16920 2015年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Nonalcoholic fatty liver disease (NAFLD) is the most common cause of chronic liver disease worldwide. Gpnmb is classified as a type 1 membrane protein and its soluble form is secreted by ADAM10-mediated cleavage. Gpnmb mRNA was found in the Kupffer cells and white adipose tissues (WATs) and its upregulation in obesity was recently found. Here, we generated aP2 promoter-driven Gpnmb transgenic (Tg) mice and the overexpression of Gpnmb ameliorated the fat accumulation and fibrosis of the liver in diet-induced obesity model. Soluble form of Gpnmb in sera was elevated in Gpnmb Tg mice and Gpnmb concentrated in hepatic macrophages and stellate cells interacted with calnexin, which resulted in the reduction of oxidative stress. In the patients with non-alcoholic steatohepatitis, serum soluble GPNMB concentrations were higher compared with the patients with simple steatosis. The GPNMB is a promising biomarker and therapeutic target for the development and progression of NAFLD in obesity.

DOI： 10.1038/srep16920

Translocase of inner mitochondrial membrane 44 alters the mitochondrial fusion and fission dynamics and protects from type 2 diabetes. 国際誌

Yu Wang, Akihiro Katayama, Takahiro Terami, Xiaoying Han, Tomokazu Nunoue, Dongxiao Zhang, Sanae Teshigawara, Jun Eguchi, Atsuko Nakatsuka, Kazutoshi Murakami, Daisuke Ogawa, Yasuhide Furuta, Hirofumi Makino, Jun Wada

Metabolism: clinical and experimental 64 ( 6 ) 677 - 88 2015年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: In obesity and type 2 diabetes, the impairment of mitochondrial function in white adipose tissue (WAT) is linked to a reduction in whole body insulin sensitivity. Timm44 is upregulated in the kidneys of streptozotocin-induced diabetic mice. In the inner mitochondrial membrane, Timm44 anchors mitochondrial heat-shock protein 70 (mtHsp70) to the translocase of inner mitochondrial membrane 23 (TIM23) complex and facilitates the import of mitochondria-targeted preproteins into the mitochondrial matrix dependent on the inner membrane potential and ATP hydrolysis on ATPase domain of mtHsp70. METHODS: We generated the aP2-promoter driven Timm44 transgenic (Tg) mouse model and investigated whether Timm44 Tg mice fed high-fat/high-sucrose (HFHS) chow are protected from type 2 diabetes and obesity. RESULTS: The body weight of aP2-promoter driven Timm44 Tg mice was lower than that of wild type mice, and insulin sensitivity was greater in Timm44 Tg mice than in wild type mice. Although WAT weight was not altered in Timm44 Tg mice fed HFHS chow, adipocyte size was reduced, and mitochondrial fusion associated with decreased expression of fission genes, such as Dnm1l and Fis1, was observed. In addition, when fed standard (STD) chow, the expressions of the fusion genes Opa1, Mfn1 and Mfn2, and Mfn1 were significantly increased in Timm44 Tg mice compared to wild type mice, and fused mitochondria were also observed in Timm44 Tg mice fed STD chow. CONCLUSIONS: The Timm44 gene may be a new target for the treatment of type 2 diabetes.

DOI： 10.1016/j.metabol.2015.02.004

Identification of circulating miR-101, miR-375 and miR-802 as biomarkers for type 2 diabetes. 国際誌

Chigusa Higuchi, Atsuko Nakatsuka, Jun Eguchi, Sanae Teshigawara, Motoko Kanzaki, Akihiro Katayama, Satoshi Yamaguchi, Naoto Takahashi, Kazutoshi Murakami, Daisuke Ogawa, Sakiko Sasaki, Hirofumi Makino, Jun Wada

Metabolism: clinical and experimental 64 ( 4 ) 489 - 97 2015年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

PURPOSE: The unique circulating microRNAs (miRNAs) observed in patients with type 2 diabetes (T2D) are candidates as new biomarkers and therapeutic targets. In order to identify circulating miRNAs relevant to the disease process in case of type 2 diabetes, we performed the Illumina sequencing of miRNAs derived from the serum, liver and epididymal white adipose tissue (WAT) of diet-induced obese male C57BL/6J mice. BASIC PROCEDURES: We selected four miRNAs, miR-101, miR-335, miR-375, and miR-802, which are increased in the sera and tissues of obese mice, and measured the serum levels of miRNAs in T2D and subjects with normal glucose tolerance (NGT). MAIN FINDINGS: The serum concentrations of miRNAs, log(10)miR-101, log(10)miR-375, and log(10)miR-802, were significantly increased in the T2D patients compared with NGT subjects (1.41±2.01 v.s. -0.57±1.05 (P=1.36×10(-5)), 0.20±0.58 v.s. 0.038±1.00 (P=3.06×10(-6)), and 2.45±1.27 v.s. 0.97±0.98 (P=0.014), respectively). The log(10)miR-335 values did not demonstrate any significant differences between the T2D and NGT groups (-1.08±1.35 v.s. -0.38±1.21 (P=0.25)). According to the stepwise regression analysis, the HbA1c was an independent predictor of miR-101. Regarding the serum miR-802 levels, eGFR, HbA1c and HDL-C values were identified as significant determinants. PRINCIPAL CONCLUSIONS: The present findings demonstrated that the circulating miR-101, miR-375 and miR-802 levels are significantly increased in T2D patients versus NGT subjects and they may become the new biomarkers for type 2 diabetes.

DOI： 10.1016/j.metabol.2014.12.003

Structural design and synthesis of arylalkynyl amide-type peroxisome proliferator-activated receptor γ (PPARγ)-selective antagonists based on the helix12-folding inhibition hypothesis. 国際誌

Masao Ohashi, Kanae Gamo, Yuta Tanaka, Minoru Waki, Yoko Beniyama, Kenji Matsuno, Jun Wada, Masafumi Tenta, Jun Eguchi, Makoto Makishima, Nobuyasu Matsuura, Takuji Oyama, Hiroyuki Miyachi

European journal of medicinal chemistry 90 53 - 67 2015年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Peroxisome proliferator-activated receptor γ (PPARγ) antagonists are candidates for treatment of type 2 diabetes, obesity and osteoporosis. However, few rational design strategies are currently available. Here, we utilized the helix12 (H12)-folding inhibition hypothesis, in combination with our previously determined X-ray crystal structure of PPARγ agonist MEKT-21 (6) complexed with the PPARγ ligand-binding domain, to design and develop a potent phenylalkynyl amide-type PPARγ antagonist 9i, focusing initially on pinpoint structural modification of the propanoic acid moiety of 6. Since 9i retained very weak, but distinct, PPARγ agonist activity, we next modified the distal benzene ring of 9i, aiming to delete the residual PPARγ agonist activity while retaining the antagonist activity. Introduction of a chlorine atom at the 2-position of the distal benzene ring afforded 9p, which exhibited potent, PPARγ-selective full antagonist activity without detectable agonist activity. We found that 9p stabilized the corepressor-PPARγ complex and suppressed basal PPARγ activity. This compound showed anti-adipogenesis activity at the cellular level. This agonist-antagonist switching concept based on the H12-folding inhibition hypothesis should also be applicable for designing other classes of PPARγ full antagonists.

DOI： 10.1016/j.ejmech.2014.11.017

2型糖尿病の経過中にBasedow病を発症した1例

布上朋和, 江口潤, 寺見隆宏, 田中景子, 平松澄恵, 小松原基志, 和田淳, 四方賢一, 槇野博史

糖尿病 57 ( 8 ) 654 - 654 2014年8月

Metallothionein deficiency exacerbates diabetic nephropathy in streptozotocin-induced diabetic mice. 国際誌

Hiromi Tachibana, Daisuke Ogawa, Norio Sogawa, Masato Asanuma, Ikuko Miyazaki, Naoto Terami, Takashi Hatanaka, Chikage Sato Horiguchi, Atsuko Nakatsuka, Jun Eguchi, Jun Wada, Hiroshi Yamada, Kohji Takei, Hirofumi Makino

American journal of physiology. Renal physiology 306 ( 1 ) F105-15 2014年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Oxidative stress and inflammation play important roles in diabetic complications, including diabetic nephropathy. Metallothionein (MT) is induced in proximal tubular epithelial cells as an antioxidant in the diabetic kidney; however, the role of MT in renal function remains unclear. We therefore investigated whether MT deficiency accelerates diabetic nephropathy through oxidative stress and inflammation. Diabetes was induced by streptozotocin injection in MT-deficient (MT(-/-)) and MT(+/+) mice. Urinary albumin excretion, histological changes, markers for reactive oxygen species (ROS), and kidney inflammation were measured. Murine proximal tubular epithelial (mProx24) cells were used to further elucidate the role of MT under high-glucose conditions. Parameters of diabetic nephropathy and markers of ROS and inflammation were accelerated in diabetic MT(-/-) mice compared with diabetic MT(+/+) mice, despite equivalent levels of hyperglycemia. MT deficiency accelerated interstitial fibrosis and macrophage infiltration into the interstitium in the diabetic kidney. Electron microscopy revealed abnormal mitochondrial morphology in proximal tubular epithelial cells in diabetic MT(-/-) mice. In vitro studies demonstrated that knockdown of MT by small interfering RNA enhanced mitochondrial ROS generation and inflammation-related gene expression in mProx24 cells cultured under high-glucose conditions. The results of this study suggest that MT may play a key role in protecting the kidney against high glucose-induced ROS and subsequent inflammation in diabetic nephropathy.

DOI： 10.1152/ajprenal.00034.2013

Pemt deficiency ameliorates endoplasmic reticulum stress in diabetic nephropathy. 国際誌

Mayu Watanabe, Atsuko Nakatsuka, Kazutoshi Murakami, Kentaro Inoue, Takahiro Terami, Chigusa Higuchi, Akihiro Katayama, Sanae Teshigawara, Jun Eguchi, Daisuke Ogawa, Eijiro Watanabe, Jun Wada, Hirofumi Makino

PloS one 9 ( 3 ) e92647 2014年

記述言語：英語掲載種別：研究論文（学術雑誌）

Phosphatidylethanolamine N-methyltransferase (Pemt) catalyzes the methylation of phosphatidylethanolamine (PE) to phosphatidylcholine (PC) mainly in the liver. Under an obese state, the upregulation of Pemt induces endoplasmic reticulum (ER) stress by increasing the PC/PE ratio in the liver. We targeted the Pemt gene in mice to explore the therapeutic impact of Pemt on the progression of diabetic nephropathy and diabetes, which was induced by the injection of streptozotocin (STZ). Although the blood glucose levels were similar in STZ-induced diabetic Pemt+/+ and Pemt-/-mice, the glomerular hypertrophy and albuminuria in Pemt-/- mice were significantly reduced. Pemt deficiency reduced the intraglomerular F4/80-positive macrophages, hydroethidine fluorescence, tubulointerstitial fibrosis and tubular atrophy. The expression of glucose-regulated protein-78 (GRP78) was enriched in the renal tubular cells in STZ-induced diabetic mice, and this was ameliorated by Pemt deficiency. In mProx24 renal proximal tubular cells, the treatment with ER-stress inducers, tunicamycin and thapsigargin, increased the expression of GRP78, which was reduced by transfection of a shRNA lentivirus for Pemt (shRNA-Pemt). The number of apoptotic cells in the renal tubules was significantly reduced in Pemt-/- diabetic mice, and shRNA-Pemt upregulated the phosphorylation of Akt and decreased the cleavage of caspase 3 and 7 in mProx24 cells. Taken together, these findings indicate that the inhibition of Pemt activity ameliorates the ER stress associated with diabetic nephropathy in a model of type 1 diabetes and corrects the functions of the three major pathways downstream of ER stress, i.e. oxidative stress, inflammation and apoptosis.

DOI： 10.1371/journal.pone.0092647

Nuclear hormone receptor expression in mouse kidney and renal cell lines. 国際誌

Daisuke Ogawa, Jun Eguchi, Jun Wada, Naoto Terami, Takashi Hatanaka, Hiromi Tachibana, Atsuko Nakatsuka, Chikage Sato Horiguchi, Naoko Nishii, Hirofumi Makino

PloS one 9 ( 1 ) e85594 2014年

記述言語：英語掲載種別：研究論文（学術雑誌）

Nuclear hormone receptors (NHRs) are transcription factors that regulate carbohydrate and lipid metabolism, immune responses, and inflammation. Although several NHRs, including peroxisome proliferator-activated receptor-γ (PPARγ) and PPARα, demonstrate a renoprotective effect in the context of diabetic nephropathy (DN), the expression and role of other NHRs in the kidney are still unrecognized. To investigate potential roles of NHRs in the biology of the kidney, we used quantitative real-time polymerase chain reaction to profile the expression of all 49 members of the mouse NHR superfamily in mouse kidney tissue (C57BL/6 and db/m), and cell lines of mesangial (MES13), podocyte (MPC), proximal tubular epithelial (mProx24) and collecting duct (mIMCD3) origins in both normal and high-glucose conditions. In C57BL/6 mouse kidney cells, hepatocyte nuclear factor 4α, chicken ovalbumin upstream promoter transcription factor II (COUP-TFII) and COUP-TFIII were highly expressed. During hyperglycemia, the expression of the NHR 4A subgroup including neuron-derived clone 77 (Nur77), nuclear receptor-related factor 1, and neuron-derived orphan receptor 1 significantly increased in diabetic C57BL/6 and db/db mice. In renal cell lines, PPARδ was highly expressed in mesangial and proximal tubular epithelial cells, while COUP-TFs were highly expressed in podocytes, proximal tubular epithelial cells, and collecting duct cells. High-glucose conditions increased the expression of Nur77 in mesangial and collecting duct cells, and liver x receptor α in podocytes. These data demonstrate NHR expression in mouse kidney cells and cultured renal cell lines and suggest potential therapeutic targets in the kidney for the treatment of DN.

DOI： 10.1371/journal.pone.0085594

Long-term treatment with the sodium glucose cotransporter 2 inhibitor, dapagliflozin, ameliorates glucose homeostasis and diabetic nephropathy in db/db mice. 国際誌

Naoto Terami, Daisuke Ogawa, Hiromi Tachibana, Takashi Hatanaka, Jun Wada, Atsuko Nakatsuka, Jun Eguchi, Chikage Sato Horiguchi, Naoko Nishii, Hiroshi Yamada, Kohji Takei, Hirofumi Makino

PloS one 9 ( 6 ) e100777 2014年

記述言語：英語掲載種別：研究論文（学術雑誌）

Inhibition of sodium glucose cotransporter 2 (SGLT2) has been reported as a new therapeutic strategy for treating diabetes. However, the effect of SGLT2 inhibitors on the kidney is unknown. In addition, whether SGLT2 inhibitors have an anti-inflammatory or antioxidative stress effect is still unclear. In this study, to resolve these issues, we evaluated the effects of the SGLT2 inhibitor, dapagliflozin, using a mouse model of type 2 diabetes and cultured proximal tubular epithelial (mProx24) cells. Male db/db mice were administered 0.1 or 1.0 mg/kg of dapagliflozin for 12 weeks. Body weight, blood pressure, blood glucose, hemoglobin A1c, albuminuria and creatinine clearance were measured. Mesangial matrix accumulation and interstitial fibrosis in the kidney and pancreatic β-cell mass were evaluated by histological analysis. Furthermore, gene expression of inflammatory mediators, such as osteopontin, monocyte chemoattractant protein-1 and transforming growth factor-β, was evaluated by quantitative reverse transcriptase-PCR. In addition, oxidative stress was evaluated by dihydroethidium and NADPH oxidase 4 staining. Administration of 0.1 or 1.0 mg/kg of dapagliflozin ameliorated hyperglycemia, β-cell damage and albuminuria in db/db mice. Serum creatinine, creatinine clearance and blood pressure were not affected by administration of dapagliflozin, but glomerular mesangial expansion and interstitial fibrosis were suppressed in a dose-dependent manner. Dapagliflozin treatment markedly decreased macrophage infiltration and the gene expression of inflammation and oxidative stress in the kidney of db/db mice. Moreover, dapagliflozin suppressed the high-glucose-induced gene expression of inflammatory cytokines and oxidative stress in cultured mProx24 cells. These data suggest that dapagliflozin ameliorates diabetic nephropathy by improving hyperglycemia along with inhibiting inflammation and oxidative stress.

DOI： 10.1371/journal.pone.0100777

Interferon regulatory factor 4 regulates obesity-induced inflammation through regulation of adipose tissue macrophage polarization. 国際誌

Jun Eguchi, Xingxing Kong, Masafumi Tenta, Xun Wang, Sona Kang, Evan D Rosen

Diabetes 62 ( 10 ) 3394 - 403 2013年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Interferon regulatory factors (IRFs) play functionally diverse roles in the transcriptional regulation of the immune system. We have previously shown that several IRFs are regulators of adipogenesis and that IRF4 is a critical transcriptional regulator of adipocyte lipid handling. However, the functional role of IRF4 in adipose tissue macrophages (ATMs) remains unclear, despite high expression there. Here we show that IRF4 expression is regulated in primary macrophages and in ATMs of high-fat diet-induced obese mice. Irf4(-/-) macrophages produce higher levels of proinflammatory cytokines, including interleukin-1β and tumor necrosis factor-α, in response to fatty acids. In coculture experiments, IRF4 deletion in macrophages leads to reduced insulin signaling and glucose uptake in 3T3-L1 adipocytes. To determine the macrophage-specific function of IRF4 in the context of obesity, we generated myeloid cell-specific IRF4 knockout mice, which develop significant insulin resistance on a high-fat diet, despite no difference in adiposity. This phenotype is associated with increased expression of inflammatory genes and decreased insulin signaling in adipose tissue, skeletal muscle, and liver. Furthermore, Irf4(-/-) ATMs express markers suggestive of enhanced M1 polarization. These findings indicate that IRF4 is a negative regulator of inflammation in diet-induced obesity, in part through regulation of macrophage polarization.

DOI： 10.2337/db12-1327

Phosphatidylethanolamine N-Methyltransferase (PEMT) Deficiency Protects from Obesity and Insulin Resistance but Promote Steatoheptitis With Tumorigenesis

Atsuko Nakatsuka, Jun Wada, Kazutoshi Murakami, Takahiro Terami, Jun Eguchi, Daisuke Ogawa, Hirofumi Makino

DIABETES 62 A529 - A529 2013年7月

Visceral adipose tissue-derived serine proteinase inhibitor inhibits apoptosis of endothelial cells as a ligand for the cell-surface GRP78/voltage-dependent anion channel complex. 国際誌

Atsuko Nakatsuka, Jun Wada, Izumi Iseda, Sanae Teshigawara, Kanji Higashio, Kazutoshi Murakami, Motoko Kanzaki, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Kazuyuki Hida, Jun Eguchi, Daisuke Ogawa, Yasushi Matsuki, Ryuji Hiramatsu, Hideo Yagita, Shigeru Kakuta, Yoichiro Iwakura, Hirofumi Makino

Circulation research 112 ( 5 ) 771 - 80 2013年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

RATIONALE: Visceral adipose tissue-derived serine proteinase inhibitor (vaspin) is an adipokine identified from visceral adipose tissues of genetically obese rats. OBJECTIVE: The role of vaspin in the diabetic vascular complications remains elusive, and we investigated the effects of vaspin on the vascular function under the diabetic milieu. METHODS AND RESULTS: Adenovirus carrying the full length of the vaspin gene (Vaspin-Ad) ameliorated intimal proliferation of balloon-injured carotid arteries in diabetic Wistar rats. The expression of Ccl2, Pdgfb, and Pdgfrb genes was significantly reduced by the treatment of Vaspin-Ad. In cuff-injured femoral arteries, the intimal proliferation was ameliorated in vaspin transgenic (Vaspin Tg) mice. The application of recombinant vaspin and Vaspin-Ad promoted the proliferation and inhibited the apoptosis of human aortic endothelial cells. Adenovirus expressing vaspin with calmodulin and streptavidin-binding peptides was applied to human aortic endothelial cells, subjected to tandem tag purification and liquid chromatography-tandem mass spectrometry, and we identified GRP78 (78-kDa glucose-regulated protein) as an interacting molecule. The complex formation of vaspin, GRP78, and voltage-dependent anion channel on the plasma membrane was confirmed by the immunoprecipitation studies using aortas of Vaspin Tg mice. The binding assay using (125)I-vaspin in human aortic endothelial cells revealed high-affinity binding (dissociation constant = 0.565×10(-9) m) by the treatment of 5 μM thapsigargin, which recruited GRP78 from the endoplasmic reticulum to plasma membrane by inducing endoplasmic reticulum stress. In human aortic endothelial cells, vaspin induced phosphorylation of Akt and inhibited the kringle 5-induced Ca(2+) influx and subsequent apoptosis. CONCLUSIONS: Vaspin is a novel ligand for the cell-surface GRP78/voltage-dependent anion channel complex in endothelial cells and promotes proliferation, inhibits apoptosis, and protects vascular injuries in diabetes mellitus.

DOI： 10.1161/CIRCRESAHA.111.300049

Serum galectin-9 levels are elevated in the patients with type 2 diabetes and chronic kidney disease. 国際誌

Yuko Kurose, Jun Wada, Motoko Kanzaki, Sanae Teshigawara, Atsuko Nakatsuka, Kazutoshi Murakami, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Mayu Watanabe, Chigusa Higuchi, Jun Eguchi, Nobuyuki Miyatake, Hirofumi Makino

BMC nephrology 14 23 - 23 2013年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Galectin-9 (Gal-9) induces apoptosis in activated T helper 1 (TH1) cells as a ligand for T cell immunoglobulin mucin-3 (Tim-3). Gal-9 also inhibits the G1 phase cell cycle arrest and hypertrophy in db/db mice, the hallmark of early diabetic nephropathy, by reversing the high glucose-induced up-regulation of cyclin dependent kinase inhibitors such as p27(Kip1) and p21(Cip1). METHODS: We investigated the serum levels of Gal-9 in the patients with type 2 diabetes and various stages of chronic kidney disease (CKD) (n=182). RESULTS: Serum Gal-9 levels in the patients with type 2 diabetes were 131.9 ± 105.4 pg/ml and Log(10)Gal-9 levels significantly and positively correlated with age (r=0.227, p=0.002), creatinine (r=0.175, p=0.018), urea nitrogen (r=0.162, p=0.028) and osmotic pressure (r=0.187, p=0.014) and negatively correlated with estimated glomerular filtration rate (eGFR) (r=-0.188, p=0.011). Log(10)Gal-9 levels increased along with the progression of GFR categories of G1 to G4, and they were statistically significant by Jonckheere-Terpstra test (p=0.012). Log(10)Gal-9 levels remained similar levels in albuminuria stages of A1 to A3. CONCLUSION: The elevation of serum Gal-9 in the patients with type 2 diabetes is closely linked to GFR and they may be related to the alteration of the immune response and inflammation of the patients with type 2 diabetes and CKD.

DOI： 10.1186/1471-2369-14-23

Urinary fetuin-A is a novel marker for diabetic nephropathy in type 2 diabetes identified by lectin microarray. 国際誌

Kentaro Inoue, Jun Wada, Jun Eguchi, Atsuko Nakatsuka, Sanae Teshigawara, Kazutoshi Murakami, Daisuke Ogawa, Takahiro Terami, Akihiro Katayama, Atsuhito Tone, Izumi Iseda, Kazuyuki Hida, Masao Yamada, Tomohisa Ogawa, Hirofumi Makino

PloS one 8 ( 10 ) e77118 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

We analyzed the urine samples of patients with type 2 diabetes at various stages of diabetic nephropathy by lectin microarray to identify a biomarker to predict the progression of diabetic nephropathy. Japanese patients with type 2 diabetes at various stages of nephropathy were enrolled and we performed lectin microarray analyses (n = 17) and measured urinary excretion of fetuin-A (n = 85). The increased signals of urine samples were observed in Siaα2-6Gal/GalNAc-binding lectins (SNA, SSA, TJA-I) during the progression of diabetic nephropathy. We next isolated sialylated glycoproteins by using SSA-lectin affinity chromatography and identified fetuin-A by liquid chromatography-tandem mass spectrometer. Urinary excretion of fetuin-A significantly increased during the progression of albuminuria (A1, 0.40 ± 0.43; A2, 0.60 ± 0.53; A3 1.57 ± 1.13 ng/gCr; p = 7.29 × 10(-8)) and of GFR stages (G1, 0.39 ± 0.39; G2, 0.49 ± 0.45; G3, 1.25 ± 1.18; G4, 1.34 ± 0.80 ng/gCr; p = 3.89 × 10(-4)). Multivariate logistic regression analysis was employed to assess fetuin-A as a risk for diabetic nephropathy with microalbuminuria or GFR<60 mL/min. Fetuin-A is demonstrated as a risk factor for both microalbuminuria and reduction of GFR in diabetic nephropathy with the odds ratio of 4.721 (1.881-11.844) and 3.739 (1.785-7.841), respectively. Collectively, the glycan profiling analysis is useful method to identify the urine biomarkers and fetuin-A is a candidate to predict the progression of diabetic nephropathy.

DOI： 10.1371/journal.pone.0077118

Urinary angiotensinogen is a marker for tubular injuries in patients with type 2 diabetes. 国際誌

Takahiro Terami, Jun Wada, Kentaro Inoue, Atsuko Nakatsuka, Daisuke Ogawa, Sanae Teshigawara, Kazutoshi Murakami, Akihiro Katayama, Jun Eguchi, Hirofumi Makino

International journal of nephrology and renovascular disease 6 233 - 40 2013年

記述言語：英語掲載種別：研究論文（学術雑誌）

PURPOSE: Urinary angiotensinogen has been reported as a marker for the activation of intrarenal renin-angiotensin system (RAS) in various kidney diseases. To investigate the importance of urinary angiotensinogen in diabetic nephropathy, we compared the urinary levels of angiotensinogen, albumin, and α1-microglobulin. MATERIALS AND METHODS: Japanese patients with type 2 diabetes at various stages of nephropathy (n=85) were enrolled, and we measured albumin/creatinine ratio (ACR) and urinary excretion of angiotensinogen and α1-microglobulin. We also compared the clinical data of the patients treated with or without angiotensin II receptor blockers or angiotensin-converting enzyme inhibitors (RAS inhibitors [+], n=51; RAS inhibitors [-], n=34). RESULTS: Urinary angiotensinogen levels positively correlated with ACR (r=0.367, P=3.84×10(-4)) and urinary α1-microglobulin (r=0.734, P=1.32 × 10(-15)), while they negatively correlated with estimated glomerular filtration ratio (eGFR) (r=-0.350, P=1.02 × 10(-3)) and high-density lipoprotein cholesterol (r=-0.216, P=0.049). Multiple regression analysis was carried out to predict urinary angiotensinogen levels by employing eGFR, ACR, and urinary α1-microglobulin as independent variables; only urinary α1-microglobulin entered the regression equation at a significant level. Although ACR was higher in the RAS inhibitors (+) group, urinary α1-microglobulin and angiotensinogen did not show significant increase in the RAS inhibitors (+) group. CONCLUSION: Urinary angiotensinogen is well correlated with urinary α1-microglobulin and reflected the tubular injuries which may be associated with the intrarenal RAS activation in patients with type 2 diabetes.

DOI： 10.2147/IJNRD.S51829

Vaspin is an adipokine ameliorating ER stress in obesity as a ligand for cell-surface GRP78/MTJ-1 complex. 国際誌

Atsuko Nakatsuka, Jun Wada, Izumi Iseda, Sanae Teshigawara, Kanji Higashio, Kazutoshi Murakami, Motoko Kanzaki, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Kazuyuki Hida, Jun Eguchi, Chikage Sato Horiguchi, Daisuke Ogawa, Yasushi Matsuki, Ryuji Hiramatsu, Hideo Yagita, Shigeru Kakuta, Yoichiro Iwakura, Hirofumi Makino

Diabetes 61 ( 11 ) 2823 - 32 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

It is unknown whether adipokines derived from adipose tissues modulate endoplasmic reticulum (ER) stress induced in obesity. Here, we show that visceral adipose tissue-derived serine protease inhibitor (vaspin) binds to cell-surface 78-kDa glucose-regulated protein (GRP78), which is recruited from ER to plasma membrane under ER stress. Vaspin transgenic mice were protected from diet-induced obesity, glucose intolerance, and hepatic steatosis, while vaspin-deficient mice developed glucose intolerance associated with upregulation of ER stress markers. With tandem affinity tag purification using HepG2 cells, we identified GRP78 as an interacting molecule. The complex formation of vaspin, GRP78, and murine tumor cell DnaJ-like protein 1 (MTJ-1) (DnaJ homolog, subfamily C, member 1) on plasma membrane was confirmed by cell-surface labeling with biotin and immunoprecipitation in liver tissues and H-4-II-E-C3 cells. The addition of recombinant human vaspin in the cultured H-4-II-E-C3 cells also increased the phosphorylation of Akt and AMP-activated protein kinase (AMPK) in a dose-dependent manner, and anti-GRP78 antibodies completely abrogated the vaspin-induced upregulation of pAkt and pAMPK. Vaspin is a novel ligand for cell-surface GRP78/MTJ-1 complex, and its subsequent signals exert beneficial effects on ER stress-induced metabolic dysfunctions.

DOI： 10.2337/db12-0232

Activation of liver X receptor inhibits osteopontin and ameliorates diabetic nephropathy. 国際誌

Hiromi Tachibana, Daisuke Ogawa, Yuichi Matsushita, Dennis Bruemmer, Jun Wada, Sanae Teshigawara, Jun Eguchi, Chikage Sato-Horiguchi, Haruhito Adam Uchida, Kenichi Shikata, Hirofumi Makino

Journal of the American Society of Nephrology : JASN 23 ( 11 ) 1835 - 46 2012年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Osteopontin is a proinflammatory cytokine and monocyte chemoattractant implicated in the pathogenesis of diabetic nephropathy. Synthetic agonists for liver X receptors (LXRs) suppress the expression of proinflammatory genes, including osteopontin, but whether LXR activation modulates diabetic nephropathy is unknown. We administered the LXR agonist T0901317 to mice with streptozotocin-induced diabetes and evaluated its effects on diabetic nephropathy. The LXR agonist decreased urinary albumin excretion without altering blood glucose levels and substantially attenuated macrophage infiltration, mesangial matrix accumulation, and interstitial fibrosis. LXR activation suppressed the gene expression of inflammatory mediators, including osteopontin, in the kidney cortex. In vitro, LXR activation suppressed osteopontin expression in proximal tubular epithelial cells by inhibiting AP-1-dependent transcriptional activation of the osteopontin promoter. Taken together, these results suggest that inhibition of renal osteopontin by LXR agonists may have therapeutic potential for diabetic nephropathy.

DOI： 10.1681/ASN.2012010022

肥満症におけるGpnmbの意義

片山晶博, 和田淳, 中司敦子, 江口潤, 村上和敏, 神崎資子, 勅使川原早苗, 井上謙太郎, 寺見隆宏, 渡邉真由, 樋口千草, 肥田和之, 四方賢一, 槇野博史

肥満研究 18 ( Suppl. ) 156 - 156 2012年9月

Serum vaspin concentrations are closely related to insulin resistance, and rs77060950 at SERPINA12 genetically defines distinct group with higher serum levels in Japanese population. 国際誌

Sanae Teshigawara, Jun Wada, Kazuyuki Hida, Atsuko Nakatsuka, Jun Eguchi, Kazutoshi Murakami, Motoko Kanzaki, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Izumi Iseda, Yuichi Matsushita, Nobuyuki Miyatake, John F McDonald, Kikuko Hotta, Hirofumi Makino

The Journal of clinical endocrinology and metabolism 97 ( 7 ) E1202-7 2012年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

CONTEXT: Vaspin is an adipokine with insulin-sensitizing effects identified from visceral adipose tissues of genetically obese rats. OBJECTIVE: We investigated genetic and nongenetic factors that define serum concentrations of vaspin. DESIGN, SETTING AND PARTICIPANTS: Vaspin levels were measured with RIA in Japanese subjects with normal fasting plasma glucose (NFG; n = 259) and type 2 diabetes patients (T2D; n = 275). Single nucleotide polymorphisms (SNP) at SERPINA12 (vaspin) gene locus were discovered, and five SNP were genotyped in the subjects with varied body mass index (n = 1138). RESULTS: The level of serum vaspin in 93% of the samples was found to vary from 0.2 to nearly 2 ng/ml in NFG subjects (n = 259) and from 0.2 to nearly 3 ng/ml in T2D patients (n = 275) (Vaspin(Low) group), whereas a significant subpopulation (7%) in both groups displayed much higher levels of 10-40 ng/ml (Vaspin(High) group). In the Vaspin(Low) group, serum vaspin levels in T2D were significantly higher than healthy subjects (0.99 ± 0.04 vs. 0.86 ± 0.02 ng/ml; P < 0.01). Both in T2D and genotyped Japanese population, serum vaspin levels closely correlated with homeostasis model of assessment for insulin resistance rather than anthropometric parameters. By genotyping, rs77060950 tightly linked to serum vaspin levels, i.e. CC (0.6 ± 0.4 ng/ml), CA (18.4 ± 9.6 ng/ml), and AA (30.5 ± 5.1 ng/ml) (P < 2 × 10(-16)). Putative GATA-2 and GATA-3 binding consensus site was found at rs77060950. CONCLUSIONS: Serum vaspin levels were related to insulin resistance, and higher levels of serum vaspin in 7% of the Japanese population are closely linked to minor allele sequence (A) of rs77060950.

DOI： 10.1210/jc.2011-3297

RXR antagonism induces G0 /G1 cell cycle arrest and ameliorates obesity by up-regulating the p53-p21(Cip1) pathway in adipocytes. 国際誌

Atsuko Nakatsuka, Jun Wada, Kazuyuki Hida, Aya Hida, Jun Eguchi, Sanae Teshigawara, Kazutoshi Murakami, Motoko Kanzaki, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Daisuke Ogawa, Hiroyuki Kagechika, Hirofumi Makino

The Journal of pathology 226 ( 5 ) 784 - 95 2012年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

The peroxisome proliferator activated receptor-γ (PPARγ) agonist, pioglitazone (PIO), exerts anti-diabetic properties associated with increased fat mass, whereas the retinoid X receptor (RXR) antagonist HX531 demonstrates anti-obesity and anti-diabetic effects with reduced body weight and fat pad mass. The cell cycle abnormality in adipocytes has not been well-investigated in obesity or during treatment with modulators of nuclear receptors. We therefore investigated cell size and cell cycle distributions of adipocytes in vivo and examined the expression of cell cycle regulators in cultured human visceral preadipocytes. The cell size distribution and cell cycle analyses of in vivo adipocytes derived from OLETF rats demonstrated that HX531 brought about G0/G1 cell cycle arrest associated with the inhibition of cellular hypertrophy, which resulted in the reduction of fat pad mass. In contrast, PIO promoted proliferation activities associated with the increase in M + late M:G0 + G1 ratio and the appearance of both small and hypertrophied adipocytes. In cultured human visceral preadipocytes HX531 up-regulated cell cycle regulators, p53, p21(Cip1), cyclin D1, Fbxw7 and Skp2, which are known contributors towards G0 /G1 cell cycle arrest. The knockdown of p53 with a shRNA lentivirus reversed the HX531-induced up-regulation of p21(Cip1), which is one of the major p53-effector molecules. We conclude that HX531 exerts anti-obesity and anti-diabetes properties by up-regulating the p53-p21(Cip1) pathway, resulting in G0/G1 cell cycle arrest and the inhibition of cellular hypertrophy of adipocytes.

DOI： 10.1002/path.3001

FOSL2 promotes leptin gene expression in human and mouse adipocytes. 国際誌

Christiane D Wrann, Jun Eguchi, Aline Bozec, Zhao Xu, Tarjei Mikkelsen, Jeffrey Gimble, Heike Nave, Erwin F Wagner, Shao-En Ong, Evan D Rosen

The Journal of clinical investigation 122 ( 3 ) 1010 - 21 2012年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

The adipocyte-derived hormone leptin is a critical regulator of many physiological functions, ranging from satiety to immunity. Surprisingly, very little is known about the transcriptional pathways that regulate adipocyte-specific expression of leptin. Here, we report studies in which we pursued a strategy integrating BAC transgenic reporter mice, reporter assays, and chromatin state mapping to locate an adipocyte-specific cis-element upstream of the leptin (LEP) gene in human fat cells. Quantitative proteomics with affinity enrichment of protein-DNA complexes identified the transcription factor FOS-like antigen 2 (FOSL2) as binding specifically to the identified region, a result that was confirmed by ChIP. Knockdown of FOSL2 in human adipocytes decreased LEP expression, and overexpression of Fosl2 increased Lep expression in mouse adipocytes. Moreover, the elevated LEP expression observed in obesity correlated well with increased FOSL2 levels in mice and humans, and adipocyte-specific genetic deletion of Fosl2 in mice reduced Lep expression. Taken together, these data identify FOSL2 as a critical regulator of leptin expression in adipocytes.

DOI： 10.1172/JCI58431

Galectin-9 and T cell immunoglobulin mucin-3 pathway is a therapeutic target for type 1 diabetes. 国際誌

Motoko Kanzaki, Jun Wada, Koichi Sugiyama, Atsuko Nakatsuka, Sanae Teshigawara, Kazutoshi Murakami, Kentaro Inoue, Takahiro Terami, Akihiro Katayama, Jun Eguchi, Hisaya Akiba, Hideo Yagita, Hirofumi Makino

Endocrinology 153 ( 2 ) 612 - 20 2012年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

Galectin-9 (Gal-9), a ligand for T cell Ig mucin-3 (Tim-3), induces apoptosis in cluster of differentiation 4 (CD4)(+) Tim-3(+) T helper 1 (T(H)1) cells via the Gal-9-Tim-3 pathway and negatively regulates T(H)1 immunity. In turn, Gal-9 activates dendritic cells (DC) to produce TNF-α, which promotes the T(H)1 response. We investigated the efficacy of Gal-9 against T(H)1-mediated autoimmune diabetes in NOD mice and compared with anti-Tim-3 monoclonal antibody (RMT3-23), which inhibited the binding between Tim-3-Ig and Gal-9 in a solid-phase binding assay. mRNA expression of Gal-9 was prominently induced by the treatment of interferon-γ in MIN6 cells, and Gal-9 was also expressed in the pancreatic β-cells in NOD mice, suggesting Gal-9 may be released from pancreatic β-cells to terminate T(H)1-mediated inflammation. Long-term injection of Gal-9 exhibits preventive efficacy for development of diabetes in NOD mice, but RMT3-23 demonstrated further prominent therapeutic potential compared with Gal-9. Gal-9 induced apoptosis of CD4(+)Tim-3(+) T(H)1 cells at the concentration of 0.2 μM, whereas RMT3-23 failed to enhance the apoptosis of CD4(+)Tim-3(+) T(H)1 cells. In contrast, Gal-9 induced TNF-α production in cultured DC in a dose-dependent manner; however, RMT3-23 inhibited Gal-9-induced TNF-α production in a dose-dependent manner. Although Gal-9 exhibited certain therapeutic potential against autoimmune diabetes by enhancing apoptosis of CD4(+)Tim-3(+) T(H)1 cells, RMT3-23 exhibited prominent therapeutic efficacy by suppressing the TNF-α production and activation of DC. Taken together, the inhibition of the Gal-9-Tim-3 pathway on DC, upstream of T(H)1 response, may be a new target for the treatment of type 1 diabetes.

DOI： 10.1210/en.2011-1579

Telmisartan attenuates diabetic nephropathy by suppressing oxidative stress in db/db mice. 国際誌

Chikage Sato-Horiguchi, Daisuke Ogawa, Jun Wada, Hiromi Tachibana, Ryo Kodera, Jun Eguchi, Atsuko Nakatsuka, Naoto Terami, Kenichi Shikata, Hirofumi Makino

Nephron. Experimental nephrology 121 ( 3-4 ) e97-e108 2012年

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND/AIMS: Telmisartan, an angiotensin II type 1 receptor blocker, is widely used to treat hypertension and kidney diseases, including diabetic nephropathy, because of its renoprotective effects. However, the mechanism by which telmisartan prevents proteinuria and renal dysfunction in diabetic nephropathy is still unclear. In this study, we examined the effects of telmisartan against diabetic nephropathy in db/db mice. METHODS: Telmisartan was administered at a dose of 5 mg/kg/day for 3 weeks to db/db (diabetic) and db/m (control) mice. Urinary albumin excretion, renal histology, and the gene expression of oxidative stress and inflammatory markers in renal tissue were determined. To evaluate the effects of telmisartan on reactive oxygen species (ROS) production, superoxide was detected by dihydroethidium (DHE) staining in vivo and in vitro. RESULTS: Telmisartan reduced albuminuria, mesangial matrix expansion, macrophage infiltration, and the expression of ROS markers (NADPH oxidase 4- and 8-hydroxydeoxyguanosine) and inflammatory cytokines (monocyte chemoattractant protein-1, osteopontin, and transforming growth factor-β) in the kidney. DHE staining showed that telmisartan decreased ROS generation in the kidney and in cultured mesangial and proximal tubular epithelial cells. CONCLUSIONS: Taken together, these findings indicate that telmisartan protects against diabetic nephropathy by reducing diabetes-induced oxidative stress.

DOI： 10.1159/000343102

Transcriptional control of adipose lipid handling by IRF4. 国際誌

Jun Eguchi, Xun Wang, Songtao Yu, Erin E Kershaw, Patricia C Chiu, Joanne Dushay, Jennifer L Estall, Ulf Klein, Eleftheria Maratos-Flier, Evan D Rosen

Cell metabolism 13 ( 3 ) 249 - 59 2011年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

Adipocytes store triglyceride during periods of nutritional affluence and release free fatty acids during fasting through coordinated cycles of lipogenesis and lipolysis. While much is known about the acute regulation of these processes during fasting and feeding, less is understood about the transcriptional basis by which adipocytes control lipid handling. Here, we show that interferon regulatory factor 4 (IRF4) is a critical determinant of the transcriptional response to nutrient availability in adipocytes. Fasting induces IRF4 in an insulin- and FoxO1-dependent manner. IRF4 is required for lipolysis, at least in part due to direct effects on the expression of adipocyte triglyceride lipase and hormone-sensitive lipase. Conversely, reduction of IRF4 enhances lipid synthesis. Mice lacking adipocyte IRF4 exhibit increased adiposity and deficient lipolysis. These studies establish a link between IRF4 and the disposition of calories in adipose tissue, with consequences for systemic metabolic homeostasis.

DOI： 10.1016/j.cmet.2011.02.005

Transcriptional targets in adipocyte biology. 国際誌

Evan Rosen, Jun Eguchi, Zhao Xu

Expert opinion on therapeutic targets 13 ( 8 ) 975 - 86 2009年8月

記述言語：英語掲載種別：研究論文（学術雑誌）

The global burden of metabolic disease demands that we develop new therapeutic strategies. Many of these approaches may center on manipulating the behavior of adipocytes, which contribute directly and indirectly to a host of disease processes including obesity and type 2 diabetes. One way to achieve this goal will be to alter key transcriptional pathways in fat cells, such as those regulating glucose uptake, lipid handling, or adipokine secretion. In this review, we look at what is known about how adipocytes govern their physiology at the gene expression level, and discuss novel ways that we can accelerate our understanding of this area.

DOI： 10.1517/14728220903039706

Collectrin is involved in the development of salt-sensitive hypertension by facilitating the membrane trafficking of apical membrane proteins via interaction with soluble N-ethylmaleiamide-sensitive factor attachment protein receptor complex. 国際誌

Akihiro Yasuhara, Jun Wada, Sandra M Malakauskas, Yanling Zhang, Jun Eguchi, Atsuko Nakatsuka, Kazutoshi Murakami, Motoko Kanzaki, Sanae Teshigawara, Kazuya Yamagata, Thu H Le, Hirofumi Makino

Circulation 118 ( 21 ) 2146 - 55 2008年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Collectrin, a homologue of angiotensin converting enzyme 2, is expressed in pancreatic beta cells and renal proximal tubular and collecting duct cells under the control of hepatocyte nuclear factors-1alpha and -1beta. Because collectrin interacts with the soluble N-ethylmaleiamide-sensitive factor attachment protein receptor (SNARE) complexes, we investigated whether collectrin is involved in sodium handling in hypertension by vesicle trafficking of apical membrane proteins. METHODS AND RESULTS: Collectrin physically interacts with the SNARE complex: snapin, synaptosomal-associated protein 23 kDa, syntaxin-4, and vesicle-associated membrane protein-2 in mIMCD-3 cells. siRNA knockdown of collectrin resulted in a reduction in membrane-associated aquaporin-2, alpha-epithelial Na+ channel, and H+-ATPase. Collectrin and SNARE proteins were abundantly expressed in collecting ducts of Wistar-Kyoto rats. Wistar-Kyoto rats and spontaneously hypertensive rats 7 weeks of age were subjected to normal-salt (1% NaCl) and high-salt (8% NaCl) chow for 10 weeks. High-salt chow prominently elevated blood pressure, oral intake, and urinary excretion of NaCl and water in both groups. Although urinary excretion of aldosterone was significantly suppressed in both groups, collectrin expression was upregulated and associated with the maintenance of aquaporin-2, alpha-epithelial Na+ channel, and H+-ATPase in membrane fractions. Collectrin promoter activities and mRNA and protein expressions were upregulated and ubiquitinated collectrin was reduced by high NaCl (175 to 225 mmol/L) and not altered by 1 micromol/L aldosterone in mIMCD-3 cells. CONCLUSIONS: Upregulation of collectrin by high NaCl independent of aldosterone functionally links to the trafficking of apical membrane proteins via the SNARE complex, and collectrin may be responsible for the sodium retention in salt-sensitive hypertension.

DOI： 10.1161/CIRCULATIONAHA.108.787259

The orphan nuclear receptor chicken ovalbumin upstream promoter-transcription factor II is a critical regulator of adipogenesis. 国際誌

Zhao Xu, Songtao Yu, Chung-Hsin Hsu, Jun Eguchi, Evan D Rosen

Proceedings of the National Academy of Sciences of the United States of America 105 ( 7 ) 2421 - 6 2008年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

The orphan nuclear receptor chicken ovalbumin upstream promoter-transcription factor II (COUP-TFII; Nr2f2) is expressed in adipose tissue in vivo and declines during differentiation. Overexpression of COUP-TFII prevents adipogenesis, whereas shRNA-mediated reduction of COUP-TFII promotes differentiation, as shown by increased lipid accumulation and elevated expression of fat cell marker proteins. Furthermore, reduction of COUP-TFII allows uncommitted fibroblasts to be differentiated into fat cells. COUP-TFII represses the expression of a number of proadipogenic factors in adipocytes, with direct action noted at the CAAT enhancer-binding protein alpha promoter. We show that COUP-TFII acts downstream of hedgehog signaling and is required for the full antiadipogenic effect of this pathway. This effect is mediated in part by interaction with GATA factors. COUP-TFII and GATA2 are physically associated and repress target gene expression in an additive manner. Taken together, our data demonstrate that COUP-TFII represents an endogenous suppressor of adipogenesis, linking antiadipogenic extracellular signals to the core transcriptional cascade.

DOI： 10.1073/pnas.0707082105

Interferon regulatory factors are transcriptional regulators of adipogenesis. 国際誌

Jun Eguchi, Qing-Wu Yan, Dustin E Schones, Michael Kamal, Chung-Hsin Hsu, Michael Q Zhang, Gregory E Crawford, Evan D Rosen

Cell metabolism 7 ( 1 ) 86 - 94 2008年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

We have sought to identify transcriptional pathways in adipogenesis using an integrated experimental and computational approach. Here, we employ high-throughput DNase hypersensitivity analysis to find regions of altered chromatin structure surrounding key adipocyte genes. Regions that display differentiation-dependent changes in hypersensitivity were used to predict binding sites for proteins involved in adipogenesis. A high-scoring example was a binding motif for interferon regulatory factor (IRF) family members. Expression of all nine mammalian IRF mRNAs is regulated during adipogenesis, and several bind to the identified motifs in a differentiation-dependent manner. Furthermore, several IRF proteins repress differentiation. This analysis suggests an important role for IRF proteins in adipocyte biology and demonstrates the utility of this approach in identifying cis- and trans-acting factors not previously suspected to participate in adipogenesis.

DOI： 10.1016/j.cmet.2007.11.002

The role for HNF-1beta-targeted collectrin in maintenance of primary cilia and cell polarity in collecting duct cells. 国際誌

Yanling Zhang, Jun Wada, Akihiro Yasuhara, Izumi Iseda, Jun Eguchi, Kenji Fukui, Qin Yang, Kazuya Yamagata, Thomas Hiesberger, Peter Igarashi, Hong Zhang, Haiyan Wang, Shigeru Akagi, Yashpal S Kanwar, Hirofumi Makino

PloS one 2 ( 5 ) e414 2007年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

Collectrin, a homologue of angiotensin converting enzyme 2 (ACE2), is a type I transmembrane protein, and we originally reported its localization to the cytoplasm and apical membrane of collecting duct cells. Recently, two independent studies of targeted disruption of collectrin in mice resulted in severe and general defects in renal amino acid uptake. Collectrin has been reported to be under the transcriptional regulation by HNF-1alpha, which is exclusively expressed in proximal tubules and localized at the luminal side of brush border membranes. The deficiency of collectrin was associated with reduction of multiple amino acid transporters on luminal membranes. In the current study, we describe that collectrin is a target of HNF-1beta and heavily expressed in the primary cilium of renal collecting duct cells. Collectrin is also localized in the vesicles near the peri-basal body region and binds to gamma-actin-myosin II-A, SNARE, and polycystin-2-polaris complexes, and all of these are involved in intracellular and ciliary movement of vesicles and membrane proteins. Treatment of mIMCD3 cells with collectrin siRNA resulted in defective cilium formation, increased cell proliferation and apoptosis, and disappearance of polycystin-2 in the primary cilium. Suppression of collectrin mRNA in metanephric culture resulted in the formation of multiple longitudinal cysts in ureteric bud branches. Taken together, the cystic change and formation of defective cilium with the interference in the collectrin functions would suggest that it is necessary for recycling of the primary cilia-specific membrane proteins, the maintenance of the primary cilia and cell polarity of collecting duct cells. The transcriptional hierarchy between HNF-1beta and PKD (polycystic kidney disease) genes expressed in the primary cilia of collecting duct cells has been suggested, and collectrin is one of such HNF-1beta regulated genes.

[ACAM, vaspin].

Jun Wada, Kazuyuki Hida, Jun Eguchi, Hirofumi Makino

Nihon rinsho. Japanese journal of clinical medicine 64 Suppl 9 297 - 9 2006年12月

Thiazolidinediones ameliorate diabetic nephropathy via cell cycle-dependent mechanisms. 国際誌

Tatsuo Okada, Jun Wada, Kazuyuki Hida, Jun Eguchi, Izumi Hashimoto, Masako Baba, Akihiro Yasuhara, Kenichi Shikata, Hirofumi Makino

Diabetes 55 ( 6 ) 1666 - 77 2006年6月

記述言語：英語掲載種別：研究論文（学術雑誌）

Thiazolidinediones are ligands for peroxisome proliferator-activated receptor (PPAR)-gamma, widely used as insulin sensitizer in type 2 diabetic patients and implicated in apoptosis, cell proliferation, and cell cycle regulation. Here, the effect of thiazolidinediones on G1-phase cell cycle arrest, the hallmark in diabetic nephropathy, was investigated. Eight-week-old male Otsuka Long-Evans Tokushima fatty rats were treated with pioglitazone (1 mg x kg body wt(-1) x day(-1)) until 50 weeks of age and compared with insulin treatment. Although similar HbA(1c) levels were observed in both groups, pioglitazone significantly inhibited glomerular hypertrophy and mesangial matrix expansion and reduced urinary albumin excretion compared with the insulin-treated group. In addition, pioglitazone significantly reduced the number of glomerular p27(Kip1)-positive cells. Because prominent expression of PPAR-gamma was observed in podocytes in glomeruli and cultured cells, conditionally immortalized mouse podocyte cells were cultured under 5.5 and 25 mmol/l D-glucose supplemented with pioglitazone. Pioglitazone inhibited cell hypertrophy revealed by [(3)H]thymidine and [(3)H]proline incorporation, and pioglitazone reversed high glucose-induced G1-phase cell cycle arrest, i.e., an increase in G0/G1 phase and decrease in S and G2 phases. Pioglitazone suppressed high glucose-induced phosphorylation of p44/42 mitogen-activated protein kinase and reduced Bcl-2 and p27(Kip1) protein levels. Besides glucose-lowering action, pioglitazone ameliorates diabetic nephropathy via cell cycle-dependent mechanisms.

Elevated serum monocyte chemoattractant protein-4 and chronic inflammation in overweight subjects. 国際誌

Izumi Hashimoto, Jun Wada, Aya Hida, Masako Baba, Nobuyuki Miyatake, Jun Eguchi, Kenichi Shikata, Hirofumi Makino

Obesity (Silver Spring, Md.) 14 ( 5 ) 799 - 811 2006年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

OBJECTIVE: Chronic inflammation observed in obesity has been reported to be implicated in the development of atherosclerosis. We screened candidate chemokines that link chronic inflammation and obesity. RESEARCH METHODS AND PROCEDURES: Japanese overweight (n = 39, BMI 28.7 +/- 0.65 kg/m(2)) and normal-weight (n = 24, BMI 22.3 +/- 0.45 kg/m(2)) subjects were enrolled. Using antibody-based protein microarray, spot intensities of monocyte chemoattractant protein (MCP)-4, eotaxin, and eotaxin-2 correlated with anthropometric parameters. We further measured serum concentration of these chemokines and mRNA levels in adipose tissues obtained from volunteers. RESULTS: Serum MCP-4 levels showed positive correlation with BMI (r = 0.318, p = 0.014), waist (r = 0.316, p = 0.018), and waist-to-hip ratio (WHR) (r = 0.264, p = 0.049). Furthermore, MCP-4 correlated with homeostasis model assessment of insulin resistance (r = 0.392, p = 0.002), high-sensitivity C-reactive protein (hsCRP) (r = 0.350, p = 0.006). In step-wise multiple regression analyses, hsCRP independently correlated with MCP-4 levels. The expression of MCP-4 mRNA in visceral adipose tissue positively correlates with BMI. Serum eotaxin levels correlate with BMI (r = 0.262, p = 0.045) and WHR (r = 0.383, p = 0.003). Serum eotaxin-2 levels correlated with BMI (r = 0.464, p < 0.001), waist (r = 0.333, p = 0.017), and WHR (r = 0.278, p = 0.048). However, eotaxin and eotaxin-2 levels did not show significant correlation with hsCRP. DISCUSSION: Serum levels of MCP-4, eotaxin, and eotaxin-2, which belong to CC chemokine family and share CC chemokine receptor 3, correlated with BMI. These chemokines, especially MCP-4, may be critical molecules that link obesity and chronic inflammation.

Elevated serum monocyte chemoattractant protein-4 and chronic inflammation in overweight subjects 査読

Izumi Hashimoto, Jun Wada, Aya Hida, Masako Baba, Nobuyuki Miyatake, Jun Eguchi, Kenichi Shikata, Hirofumi Makino

OBESITY 14 ( 5 ) 799 - 811 2006年5月

記述言語：英語掲載種別：研究論文（学術雑誌）出版者・発行元：NORTH AMER ASSOC STUDY OBESITY

Objective: Chronic inflammation observed in obesity has been reported to be implicated in the development of atherosclerosis. We screened candidate chemokines that link chronic inflammation and obesity.
Research Methods and Procedures: Japanese overweight (n = 39, BMI 28.7 +/- 0.65 kg/m(2)) and normal-weight (n = 24, BMI 22.3 +/- 0.45 kg/m(2)) subjects were enrolled. Using antibody-based protein microarray, spot intensities of monocyte chemoattractant protein (MCP)-4, eotaxin, and eotaxin-2 correlated with anthropometric parameters. We further measured serum concentration of these chemokines and mRNA levels in adipose tissues obtained from volunteers.
Results: Serum MCP-4 levels showed positive correlation with BMI (r = 0.318, p = 0.014), waist (r = 0.316, p = 0.018), and waist-to-hip ratio (WHR) (r = 0.264, p = 0.049). Furthermore, MCP-4 correlated with homeostasis model assessment of insulin resistance (r = 0.392, p = 0.002), high-sensitivity C-reactive protein (hsCRP) (r = 0.350, p = 0.006). In step-wise multiple regression analyses, hsCRP independently correlated with MCP-4 levels. The expression of MCP-4 mRNA in visceral adipose tissue positively correlates with BMI. Serum eotaxin levels correlate with BMI (r = 0.262, p = 0.045) and WHR (r = 0.383, p = 0.003). Serum eotaxin-2 levels correlated with BMI (r = 0.464, p < 0.001), waist (r = 0.333, p = 0.017), and WHR (r = 0.278, p = 0.048). However, eotaxin and eotaxin-2 levels did not show significant correlation with hsCRP.
Discussion: Serum levels of MCP-4, eotaxin, and eotaxin-2, which belong to CC chemokine family and share CC chemokine receptor 3, correlated with BMI. These chemokines, especially MCP-4, may be critical molecules that link obesity and chronic inflammation.

DOI： 10.1038/oby.2006.93

Therapeutic approach for diabetic nephropathy using gene delivery of translocase of inner mitochondrial membrane 44 by reducing mitochondrial superoxide production. 国際誌

Yanling Zhang, Jun Wada, Izumi Hashimoto, Jun Eguchi, Akihiro Yasuhara, Yashpal S Kanwar, Kenichi Shikata, Hirofumi Makino

Journal of the American Society of Nephrology : JASN 17 ( 4 ) 1090 - 101 2006年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

Hyperglycemia-induced overproduction of mitochondrial reactive oxygen species has emerged as a major player in diabetic vascular complications. Mammalian translocase of inner mitochondrial membrane 44 (TIM44) was identified by upregulation in diabetic mouse kidneys. TIM44 functions as a membrane anchor of mitochondrial heat-shock protein 70 (mtHsp70) to TIM23 complex and is involved in the import of mitochondria-targeted preproteins into mitochondrial matrix. The process is dependent on inner membrane potential and ATP hydrolysis on ATPase domain of mitochondrial heat-shock protein 70. Hemagglutination virus of Japan-envelope vector that carries pcDNA3.1 plasmid that contains the full-length cDNA of TIM44 and control plasmid were injected weekly into the tail vein of uninephrectomized streptozotocin-induced diabetic CD-1 mice. The gene delivery alleviated proteinuria and renal hypertrophy at 8 wk after the injection, inhibited renal cell proliferation and apoptosis, and suppressed superoxide production. In vitro experiments, using human proximal tubular (HK2) cells, revealed that the gene delivery of TIM44 reversed high glucose-induced metabolic and cellular abnormalities such as enhanced reactive oxygen species production, increased ATP contents, alterations in inner membrane potential, increased cell proliferation, and apoptosis. Transfection with siRNA and expressing vector of TIM44 revealed that TIM44 facilitates import of antioxidative enzymes such as superoxide dismutase and glutathione peroxidase into mitochondria. The gene delivery of TIM44 therefore seems to be beneficial for the maintenance of mitochondrial function and is a novel therapeutic approach for diabetic nephropathy.

Galectin-9 inhibits glomerular hypertrophy in db/db diabetic mice via cell-cycle-dependent mechanisms. 国際誌

Masako Baba, Jun Wada, Jun Eguchi, Izumi Hashimoto, Tatsuo Okada, Akihiro Yasuhara, Kenichi Shikata, Yashpal S Kanwar, Hirofumi Makino

Journal of the American Society of Nephrology : JASN 16 ( 11 ) 3222 - 34 2005年11月

記述言語：英語掲載種別：研究論文（学術雑誌）

Galectins are beta-galactoside-binding lectins that are involved in various biologic processes, such as apoptosis, cell proliferation, and cell-cycle regulation. Galectin-9 (Gal-9) was identified previously and demonstrated to have apoptotic potential to thymocytes in mice and activated CD8(+) T cells in nephrotoxic serum nephritis model. In this study, the effect of Gal-9 on G1-phase cell-cycle arrest, one of the hallmark pathologic changes in early diabetic nephropathy, was investigated. Eight-week-old male db/db mice received injections of recombinant Gal-9 or vehicle for 8 wk. The injection of Gal-9 into db/db mice significantly inhibited glomerular hypertrophy and mesangial matrix expansion and reduced urinary albumin excretion. Gal-9 reduced glomerular expression of TGF-beta1 and the number of p27(Kip1)- and p21(Cip1)-positive cells in glomeruli. Double staining with nephrin and type IV collagen revealed that podocytes were mainly positive for p27(Kip1). For further confirming the cell-cycle regulation by Gal-9, conditionally immortalized mouse podocyte cells were cultured under 5.5 and 25 mM d-glucose supplemented with Gal-9. Cell-cycle distribution analyses revealed that Gal-9 maintained further progression of cell cycle from the G1 phase. Gal-9 reversed the high-glucose-mediated upregulation of p27(Kip1) and p21(Cip1) and inhibited cell-cycle-dependent hypertrophy, i.e., reduced [(3)H]proline incorporation. The data suggest that Gal-9 plays a central role in inducing their successful progression from G1 to G2 phase by suppressing glomerular expression of TGF-beta1 and inhibition of cyclin-dependent kinase inhibitors. Gal-9 may give an impetus to develop new therapeutic tools targeted toward diabetic nephropathy.

Gene delivery of Tim44 reduces mitochondrial superoxide production and ameliorates neointimal proliferation of injured carotid artery in diabetic rats. 国際誌

Takashi Matsuoka, Jun Wada, Izumi Hashimoto, Yanling Zhang, Jun Eguchi, Norio Ogawa, Kenichi Shikata, Yashpal S Kanwar, Hirofumi Makino

Diabetes 54 ( 10 ) 2882 - 90 2005年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Hyperglycemia induces the production of reactive oxygen species (ROS) from mitochondria, which is closely related to diabetic vascular complications. Mammalian translocase of inner mitochondrial membrane (Tim)44 was identified by upregulation in streptozotocin (STZ)-induced diabetic mouse kidneys; Tim44 functions as a membrane anchor of mtHsp70 to TIM23 complex and is involved in the import of preproteins with mitochondria-targeted presequence into mitochondrial matrix. The process is dependent on inner membrane potential (Delta psi) and ATP hydrolysis on ATPase domain of mtHsp70. Here, we show that the gene delivery of Tim44 using pcDNA3.1 vector (pcDNA3.1/TIM44) into the balloon injury model of STZ-induced diabetic rats ameliorated neointimal proliferation. ROS production, inflammatory responses, and cell proliferation in injured carotid artery were diminished by delivery of pcDNA3.1/TIM44. In vitro experiments using human aortic smooth muscle cells (HASMCs) revealed that the gene delivery of Tim44 normalized high-glucose-induced enhanced ROS production and increased ATP production, alterations in inner membrane potential, and cell proliferation. Transfection of siRNA and pcDNA3.1/TIM44 using HASMC culture clarified that import of antioxidative enzymes such as superoxide dismutase and glutathione peroxidase was facilitated by Tim44. Tim44 and its related molecules in mitochondrial import machinery complex are novel targets in the therapeutic interventions for diabetes and its vascular complications.

Visceral adipose tissue-derived serine protease inhibitor: a unique insulin-sensitizing adipocytokine in obesity. 国際誌

Kazuyuki Hida, Jun Wada, Jun Eguchi, Hong Zhang, Masako Baba, Aya Seida, Izumi Hashimoto, Tatsuo Okada, Akihiro Yasuhara, Atsuko Nakatsuka, Kenichi Shikata, Shinji Hourai, Junichiro Futami, Eijiro Watanabe, Yasushi Matsuki, Ryuji Hiramatsu, Shigeru Akagi, Hirofumi Makino, Yashpal S Kanwar

Proceedings of the National Academy of Sciences of the United States of America 102 ( 30 ) 10610 - 5 2005年7月

記述言語：英語掲載種別：研究論文（学術雑誌）

There is a rapid global rise in obesity, and the link between obesity and diabetes remains somewhat obscure. We identified an adipocytokine, designated as visceral adipose tissue-derived serpin (vaspin), which is a member of serine protease inhibitor family. Vaspin cDNA was isolated by from visceral white adipose tissues (WATs) of Otsuka Long-Evans Tokushima fatty (OLETF) rat, an animal model of abdominal obesity with type 2 diabetes. Rat, mouse, and human vaspins are made up of 392, 394, and 395 amino acids, respectively; exhibit approximately 40% homology with alpha1-antitrypsin; and are related to serine protease inhibitor family. Vaspin was barely detectable in rats at 6 wk and was highly expressed in adipocytes of visceral WATs at 30 wk, the age when obesity, body weight, and insulin levels peak in OLETF rats. The tissue expression of vaspin and its serum levels decrease with worsening of diabetes and body weight loss at 50 wk. The expression and serum levels were normalized with the treatment of insulin or insulin-sensitizing agent, pioglitazone, in OLETF rats. Administration of vaspin to obese CRL:CD-1 (ICR) (ICR) mice fed with high-fat high-sucrose chow improved glucose tolerance and insulin sensitivity reflected by normalized serum glucose levels. It also led to the reversal of altered expression of genes relevant to insulin resistance, e.g., leptin, resistin, TNFalpha, glucose transporter-4, and adiponectin. In DNA chip analyses, vaspin treatment resulted in the reversal of expression in approximately 50% of the high-fat high-sucrose-induced genes in WATs. These findings indicate that vaspin exerts an insulin-sensitizing effect targeted toward WATs in states of obesity.

Identification of adipocyte adhesion molecule (ACAM), a novel CTX gene family, implicated in adipocyte maturation and development of obesity. 国際誌

Jun Eguchi, Jun Wada, Kazuyuki Hida, Hong Zhang, Takashi Matsuoka, Masako Baba, Izumi Hashimoto, Kenichi Shikata, Norio Ogawa, Hirofumi Makino

The Biochemical journal 387 ( Pt 2 ) 343 - 53 2005年4月

記述言語：英語掲載種別：研究論文（学術雑誌）

Few cell adhesion molecules have been reported to be expressed in mature adipocytes, and the significance of cell adhesion process in adipocyte biology is also unknown. In the present study, we identified ACAM (adipocyte adhesion molecule), a novel homologue of the CTX (cortical thymocyte marker in Xenopus) gene family. ACAM cDNA was isolated during PCR-based cDNA subtraction, and its mRNA was shown to be up-regulated in WATs (white adipose tissues) of OLETF (Otsuka Long-Evans Tokushima fatty) rats, an animal model for Type II diabetes and obesity. ACAM, 372 amino acids in total, has a signal peptide, V-type (variable) and C2-type (constant) Ig domains, a single transmembrane segment and a cytoplasmic tail. The amino acid sequence in rat is highly homologous to mouse (94%) and human (87%). ACAM mRNA was predominantly expressed in WATs in OLETF rats, and increased with the development of obesity until 30 weeks of age, which is when the peak of body mass is reached. Western blot analysis revealed that ACAM protein, approx. 45 kDa, was associated with plasma membrane fractions of mature adipocytes isolated from mesenteric and subdermal adipose deposits of OLETF rats. Up-regulation of ACAM mRNAs in obesity was also shown in WATs of genetically obese db/db mice, diet-induced obese ICR mice and human obese subjects. In primary cultured mouse and human adipocytes, ACAM mRNA expression was progressively up-regulated during differentiation. Several stably transfected Chinese-hamster ovary K1 cell lines were established, and the quantification of ACAM mRNA and cell aggregation assay revealed that the degree of homophilic aggregation correlated well with ACAM mRNA expression. In summary, ACAM may be the critical adhesion molecule in adipocyte differentiation and development of obesity.

VASPIN(visceral adipose tissue specific SERPIN)とインスリン抵抗性

肥田和之, 和田淳, 江口潤, 松岡孝至, 橋本泉, 安原章浩, 中司敦子, 清田綾, 岡田達夫, 馬場雅子, 四方賢一, 槇野博史

糖尿病 47 ( Suppl.1 ) S252 - S252 2004年4月

The role of adrenomedullin and receptors in glomerular hyperfiltration in streptozotocin-induced diabetic rats. 国際誌

Keita Hiragushi, Jun Wada, Jun Eguchi, Takashi Matsuoka, Akihiro Yasuhara, Izumi Hashimoto, Tetsuji Yamashita, Kazuyuki Hida, Yoshio Nakamura, Kenichi Shikata, Naoto Minamino, Kenji Kangawa, Hirofumi Makino

Kidney international 65 ( 2 ) 540 - 50 2004年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

BACKGROUND: Since adrenomedullin (AM) elicits vasodilatation by binding to specific AM receptors consisted of calcitonin-receptor-like receptor (CRLR)/receptor-activity-modifying protein 2 (RAMP2) or CRLR/receptor-activity-modifying protein 3 (RAMP3) on endothelial cells and stimulating nitric oxide production, AM possibly involves in glomerular capillary dilatation in early phase of diabetic nephropathy. METHODS: Streptozotocin (STZ)-induced diabetic Sprague-Dawley rats at 4 weeks after the injection were employed for expression studies of AM, RAPM2, and RAMP3. The measurement of AM peptide levels in kidney tissue, plasma, and urine was performed. Human aortic endothelial cells (HAEC) were used to investigate functional link between glucose-induced AM production and nitric oxide release. RESULTS: STZ rats showed glomerular hypertrophy and increased urinary NO2- and NO3- excretion. By Northern blot analyses, AM and RAPM2 mRNAs significantly increased in the kidneys of STZ rats, while RAMP3 mRNA was not altered. In STZ rats, AM peptide was actively secreted into urine (1280 +/- 360 fmol/day vs. control 110 +/- 36 fmol/day). AM peptide was mainly detected on cortical and medullary collecting duct cells in control rat kidneys and AM peptide and mRNA were up-regulated on afferent arterioles and glomeruli of STZ rats. RAMP2 expression was detected on afferent arterioles and not in glomeruli in control rats and it was up-regulated on glomerular endothelial cells in STZ rats. In HAEC culture, d-glucose stimulated AM and nitric oxide production and they were suppressed by addition of AM antisense oligodeoxynucleotides. CONCLUSION: Up-regulated expression of AM and RAMP2 in afferent arterioles and glomeruli may be related to selective dilatation of glomerular capillary in acute phase of type 1 diabetes.

Multicentric Castleman's disease associated with glomerular microangiopathy and MPGN-like lesion: does vascular endothelial cell-derived growth factor play causative or protective roles in renal injury? 国際誌

Aya Seida, Jun Wada, Yoshitaka Morita, Masako Baba, Jun Eguchi, Norihisa Nishimoto, Takeshi Okino, Koichi Ichimura, Tadashi Yoshino, Hirofumi Makino

American journal of kidney diseases : the official journal of the National Kidney Foundation 43 ( 1 ) E3-9 2004年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

A 52-year-old Japanese man presented with fever spikes, generalized fatigue, anorexia, and anasarca. The patient was referred for the evaluation of fever of unknown origin in association with swelling of cervical, axillary, and inguinal lymph nodes. He also manifested nephrotic syndrome, acute renal failure, hepatosplenomegaly, massive pleural effusion, ascites, disseminated intravascular coagulation, and hypergammaglobulinemia. C-reactive protein was positive and plasma vascular endothelial cell-derived growth factor (VEGF) and serum interleukin-6 levels were markedly elevated. Lymph node biopsy results showed that findings were compatible with Castleman's disease of hyaline vascular type associated with interfollicular plasmacytosis. In conjunction with the clinical findings, a diagnosis of multicentric Castleman's disease was made. The patient underwent renal biopsy because of nephrotic syndrome, and the results showed proliferation of mesangial cells, lobulation of glomeruli, and tram track pattern of the capillary wall without immune complex deposition. Electron microscopy showed widening of the subendothelial space. No electron-dense deposits were present in both mesangial and subendothelial regions. Pathologic features were compatible with glomerular microangiopathy and membranoproliferative glomerulonephritis-like lesions. With corticosteroid therapy, systemic symptoms disappeared; both VEGF and interleukin-6 levels were normalized, and he went into complete remission of nephrotic syndrome. In this article, the role VEGF plays in the pathogenesis of nephrotic syndrome and glomerular microangiopathy is discussed.

白色脂肪特異的新規膜蛋白(OL-16)の機能解析

江口潤, 和田淳, 肥田和之, 松岡孝至, 馬場雅子, 中司敦子, 橋本泉, 清田綾, 安原章浩, 岡田達夫, 四方賢一, 槇野博史

肥満研究 9 ( Suppl. ) 76 - 76 2003年10月

反応性マクロファージ活性化症候群を合併したGAD抗体陽性の1型糖尿病の1例

橋本泉, 四方賢一, 城戸雄一, 江口潤, 和田淳, 槇野博史

糖尿病 46 ( 3 ) 268 - 268 2003年3月

[Management of diabetic nephropathy with nephrotic syndrome].

Jun Eguchi, Jun Wada, Hirofumi Makino

Nihon rinsho. Japanese journal of clinical medicine 60 Suppl 10 430 - 6 2002年10月

糖尿病性大血管障害におけるミトコンドリア機能異常の関与

松岡孝至, 和田淳, 江口潤, 橋本泉, 清田綾, 肥田和之, 中村好男, 四方賢一, 槇野博史

糖尿病合併症 16 ( Suppl.1 ) 96 - 96 2002年9月

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