Faculty Profiles - TSUJI Kenji

Papers - TSUJI Kenji

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A Case of IgA Nephropathy With Membranoproliferative Glomerulonephritis-Like Features. Reviewed International journal

Miyu Kanazawa, Kenji Tsuji, Ryoya Aoki, Mihiro Sue, Hiromasa Miyake, Naruhiko Uchida, Hiroyuki Nakanoh, Kazuhiko Fukushima, Haruhito A Uchida, Jun Wada

Nephrology (Carlton, Vic.) 30 ( 5 ) e70057 2025.5

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

A 73-year-old man was referred due to the onset of nephrotic-range proteinuria. He had been diagnosed with rheumatoid arthritis 18 years prior and had achieved remission with treatment, including methotrexate and janus kinase (JAK) inhibitor. Although routine follow-ups had not revealed any urinary abnormalities, subsequent tests detected proteinuria and hematuria in the absence of infection or other symptoms. As the urinary abnormalities persisted, with a serum albumin decrease and proteinuria measuring 5.7 g/day, indicating nephrotic syndrome, the patient was referred to our hospital for further evaluation, and a renal biopsy was performed. Light microscopy revealed mesangial cell proliferation, endocapillary proliferation and double-contoured basement membranes. Immunofluorescence microscopy showed IgA-dominant deposits in both mesangial areas and glomerular capillary walls. Transmission electron microscopy demonstrated electron-dense deposits in the mesangium and subendothelial regions, leading to the diagnosis of membranoproliferative glomerulonephritis (MPGN)-type IgA nephropathy. Immunostaining with the Gd-IgA1 (galactose-deficient IgA1)-specific antibody (KM55) was positive, consistent with the diagnosis. Following the initiation of steroid therapy, proteinuria rapidly decreased, achieving complete remission within 5 months. IgA nephropathy with MPGN-like features often presents as nephrotic syndrome, differing from the typical pathological and clinical presentation of IgA nephropathy, making differentiation from secondary MPGN and other diseases sometimes challenging. This case suggests that KM55 staining may offer additional information in differentiating atypical IgA nephropathy with non-classical pathological features.

DOI： 10.1111/nep.70057

Text mining for case report articles on "peritoneal dialysis" from PubMed database. Reviewed International journal

Kazuhiko Fukushima, Kenji Tsuji, Hiroyuki Nakanoh, Naruhiko Uchida, Soichiro Haraguchi, Shinji Kitamura, Jun Wada

Therapeutic apheresis and dialysis : official peer-reviewed journal of the International Society for Apheresis, the Japanese Society for Apheresis, the Japanese Society for Dialysis Therapy 2025.3

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: The number of published medical articles on peritoneal dialysis (PD) has been increasing, and efficiently selecting information from numerous articles can be difficult. In this study, we examined whether artificial intelligence (AI) text mining can be a good support for efficiently collecting PD information. METHODS: We performed text mining and analyzed all the abstracts of case reports on PD in the PubMed database. In total, 3137 case reports with abstracts related to "peritoneal dialysis" published from 1970 to 2021 were identified. RESULTS: A total of 280 347 relevant words were extracted from all the abstracts. Word frequency analysis, word dependency analysis, and word frequency transition analysis showed that peritonitis, encapsulating peritoneal sclerosis, and child have been important keywords. Theseanalyses not only reflected historical background but also anticipated future trends of PD study. CONCLUSION: These suggest that text mining can be a good support for efficiently collecting PD information.

DOI： 10.1111/1744-9987.70013

Supplement-induced acute kidney injury reproduced in kidney organoids. Reviewed International journal

Hiroyuki Nakanoh, Kenji Tsuji, Kazuhiko Fukushima, Soichiro Haraguchi, Shinji Kitamura, Jun Wada

American journal of nephrology 1 - 15 2025.2

Authorship：Corresponding author Language：English

INTRODUCTION: Acute kidney injury (AKI) associated with the consumption of Beni-koji CholesteHelp supplements, which contain red yeast rice (Beni-Koji), has become a significant public health concern in Japan. While renal biopsy findings from several case reports have suggested tubular damage, no definitive causal relationship has been established, and the underlying mechanisms of kidney injury remain poorly understood. The complexity of identifying toxic substances in supplements containing various bioactive compounds makes conventional investigative approaches both time-consuming and challenging. This highlights an urgent need to establish a reliable platform for assessing organ-specific toxicity in such supplements. In this study, we utilized a kidney organoid model derived from adult rat kidney stem cells (KS cells) to assess the potential tubular toxicity of these supplements. METHODS: KS cell clusters were cultured in three-dimensional system supplemented with growth factors to promote kidney organoids. The organoids were subsequently exposed to Beni-koji CholesteHelp supplements or cisplatin, followed by histological and molecular analyses to evaluate structural and molecular impacts. RESULTS: Established organoids had the kidney-like structures including tubular-like structures and glomerulus-like structures at the tips of multiple tubules. Treatment with Beni-koji CholesteHelp supplements induced significant tubular damage in the organoids, characterized by epithelial cell thinning, structural disruption, and increase in cleaved caspase-3-positive apoptotic tubular cells, similar to the organoids treated with cisplatin. CONCLUSIONS: These findings provide the first evidence suggesting that certain toxicants in specific batches of Beni-koji CholesteHelp supplements cause direct renal tubular injury. This KS cell-based organoid system represents a cost-effective, reproducible, and technically simple platform for nephrotoxicity screening.

DOI： 10.1159/000544795

The Gut-Kidney Axis in Chronic Kidney Diseases. Reviewed International journal

Kenji Tsuji, Naruhiko Uchida, Hiroyuki Nakanoh, Kazuhiko Fukushima, Soichiro Haraguchi, Shinji Kitamura, Jun Wada

Diagnostics (Basel, Switzerland) 15 ( 1 ) 2024.12

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

The gut-kidney axis represents the complex interactions between the gut microbiota and kidney, which significantly impact the progression of chronic kidney disease (CKD) and overall patient health. In CKD patients, imbalances in the gut microbiota promote the production of uremic toxins, such as indoxyl sulfate and p-cresyl sulfate, which impair renal function and contribute to systemic inflammation. Mechanisms like endotoxemia, immune activation and oxidative stress worsen renal damage by activating pro-inflammatory and oxidative pathways. Insights into these mechanisms highlight the impact of gut-derived metabolites, bacterial translocation, and immune response changes on kidney health, suggesting new potential approaches for CKD treatment. Clinical applications, such as dietary interventions, prebiotics, probiotics and fecal microbiota transplantation, are promising in adjusting the gut microbiota to alleviate CKD symptoms and slow disease progression. Current research highlights the clinical relevance of the gut-kidney axis, but further study is essential to clarify these mechanisms' diagnostic biomarkers and optimize therapeutic interventions. This review emphasizes the importance of an integrated approach to CKD management, focusing on the gut microbiota as a therapeutic target to limit kidney injury.

DOI： 10.3390/diagnostics15010021

Presumed Choroidopathy of IgG4-Related Disease Discovered During 16-Year Follow-Up of a Patient With Polycystic Kidney Disease. Reviewed International journal

Toshihiko Matsuo, Takehiro Tanaka, Kenji Tsuji

Cureus 16 ( 10 ) e70865 2024.10

Language：English Publishing type：Research paper (scientific journal)

Immunoglobulin G4 (IgG4)-related disease is characterized by infiltration with IgG4-producing plasma cells in different organs and the elevation of serum IgG4. We present a patient with polycystic kidney disease in long-term follow-up who developed bilateral lacrimal gland enlargement and presumed IgG4-related choroidopathy at different time points. A 45-year-old woman developed bilateral upper eyelid swelling. Head MRI showed bilateral lacrimal gland enlargement, and the resection on both sides revealed foci of infiltration with lymphocytes and plasma cells in bilateral lacrimal glands. The IgG4-immunostaining did not satisfy the diagnostic criteria. She had been taking oral valsartan 40 mg daily for hypertension with polycystic kidney disease. The patient was well until the age of 49 years, when she noticed yellowish vision in the right eye compared to the left eye. The right eye showed multiple yellowish spotty lesions in the deep retina to choroid with a mildly hyperemic optic disc, while the left eye showed the normal fundus. No inflammation was noted in the anterior segments of both eyes. Fundus angiography demonstrated early-phase no-filling with late-phase leakage by fluorescein dye and both early-phase and late-phase no-filling by indocyanine green dye, leading to the diagnosis of acute posterior multifocal placoid pigment epitheliopathy (APMPPE). She began to have oral prednisolone tapered from 30 mg daily and discontinued in a year. At the age of 52 years, she switched to candesartan 8 mg daily and began to have tolvaptan (a selective competitive vasopressin receptor 2 (V2) antagonist) 90 mg daily for polycystic kidney disease with liver cysts. At that time, the lesions in the right eye had mild degeneration. The patient was followed once a year ophthalmologically to maintain good vision. At 57 years, serum IgG4, which was measured for the first time on suspicion of IgG4-related disease, was elevated to 269.6 mg/dL. In the following four years to the latest visit at 61 years, she kept stable but high levels of serum IgG4 around 300 mg/dL. Serum IgG4 measurement is helpful to make a clinical diagnosis and, hence, a clinical decision since the spectrum of IgG4-related disease remains obscure.

DOI： 10.7759/cureus.70865

A case of renal hypouricemia due to T217M mutation in SLC22A12 incidentally associated with IgA nephropathy. Reviewed International journal

Yoshimasa Sakurabu, Haruhito A Uchida, Toshihisa Tahara, Tomohiko Asakawa, Haruka Yamasaki, Katsuyoshi Katayama, Shugo Okamoto, Yasuhiro Onishi, Natsumi Matsuoka-Uchiyama, Keiko Tanaka, Hidemi Takeuchi, Kenji Tsuji, Ryoko Umebayashi, Yuki Ohashi, Kimiyoshi Ichida, Jun Wada

Clinical case reports 12 ( 9 ) e9368 2024.9

Language：English Publishing type：Research paper (scientific journal)

A T217M heterozygous mutation in the SLC22A12 gene caused renal hypouricemia; this patient with IgA nephropathy had no findings other than IgA nephropathy on renal biopsy. Hypouricemia was susceptible to oxidative stress, but IgA nephropathy in the patient with hypouricemia could be treated with steroid pulse therapy without adverse events.

DOI： 10.1002/ccr3.9368

A case of membranous nephropathy complicated by Cronkhite-Canada syndrome successfully treated with mizoribine. Reviewed

Hiroyuki Nakanoh, Kenji Tsuji, Shiho Morimoto, Kazuhiko Fukushima, Masaya Iwamuro, Haruhito A Uchida, Jun Wada

CEN case reports 2024.7

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Cronkhite-Canada syndrome (CCS) is a non-hereditary disorder characterized by non-neoplastic hamartomatous gastrointestinal polyposis, hair loss, nail atrophy, hyperpigmentation, and diarrhea. While the relationship between CCS and nephritis remains unclear, seven cases of nephritis complicated by CCS have been reported to date, all of which were membranous nephropathy (MN). A 57-year-old man presented with taste disturbance, hair loss, nail plate atrophy, skin pigmentation, and frequent diarrhea. Endoscopic findings showed multiple polyposis of the stomach and large intestine. Given the above, he was diagnosed with CCS. The symptoms gradually improved with prednisolone treatment, although urinary protein and hypoproteinemia appeared during the tapering of prednisolone. He was diagnosed with MN using a renal biopsy, and immunofluorescence microscopy with IgG subclass staining showed predominantly diffuse granular capillary wall staining of IgG4. The cause of secondary MN was not found, including malignant tumors. Nephrotic-range proteinuria persisted despite treatment with prednisolone and cyclosporine. Additional treatment with mizoribine resulted in incomplete remission type 1 of nephrotic syndrome, suggesting that mizoribine may be a treatment option for patients with CCS with steroid-resistant MN. Considering a high prevalence of hypoproteinemia due to chronic diarrhea and protein-losing enteropathy in patients with CCS, proteinuria might be overlooked; thus, follow-up urinalysis would be recommended in patients with CCS.

DOI： 10.1007/s13730-024-00908-9

Successful treatment for life threatening recurrent non-traumatic rectus sheath hematoma in a case with microscopic polyangiitis with rapidly progressive glomerulonephritis. Reviewed

Hiroyuki Nakanoh, Hidemi Takeuchi, Morimoto Shiho, Yuya Terajima, Shugo Okamoto, Yasuhiro Onishi, Keiko Tanaka, Takayuki Katsuyama, Kenji Tsuji, Yoshinori Matsumoto, Katsuyuki Tanabe, Hiroshi Morinaga, Mayu Uka, Koji Tomita, Haruhito A Uchida, Takao Hiraki, Jun Wada

Internal medicine (Tokyo, Japan) 2024.4

Language：English Publishing type：Research paper (scientific journal)

A 68-year-old woman was admitted to our hospital because of a rapid progression of renal dysfunction with positive myeloperoxidase antineutrophil cytoplasmic antibody and was diagnosed with rapidly progressive glomerulonephritis associated with microscopic polyangiitis (MPA). Severe right rectus sheath hematoma (RSH) bleeding from the inferior epigastric artery developed after starting hemodialysis, which required 4 transarterial embolizations due to recurrent bleeding. After additional treatment with methylprednisolone pulse therapy and rituximab, no rebleeding occurred. Although the giant hematoma reached the pelvis, it shrank spontaneously without any intervention. Nontraumatic RSH should therefore be considered when treating patients with multiple risk factors.

DOI： 10.2169/internalmedicine.3239-23

Effects of HIF-PHD inhibitors in kidney development. Reviewed International journal

Soichiro Haraguchi, Kenji Tsuji, Hiroyuki Nakanoh, Kazuhiko Fukushima, Shinji Kitamura, Jun Wada

Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association 2024.3

平滑筋肉腫の両側腎臓への転移に対して両腎摘出術を契機に血液透析導入とした一例 Reviewed

浅川知彦, 竹内英実, 岡本修吾, 大西康博, 田中景子, 辻憲二, 田邊克幸, 森永裕士, 内田治仁, 和田淳

中国腎不全研究会誌 32 2024

SLE透析例のESA低反応性貧血に対しベリムマブにて改善2症例と急性ループス肺炎の剖検例の考察 Reviewed

原口総一郎, 成清武文, 蒲生直幸, 喜多村真治, 辻憲二, 佐田憲映

中国腎不全研究会誌 32 2024

当院における非外傷性腹直筋血腫5症例の報告 Reviewed

中納弘幸, 竹内英実, 森本志帆, 寺嶋悠也, 岡本修吾, 大西康博, 田中景子, 勝山隆行, 辻憲二, 田邊克幸, 森永裕士, 宇賀麻由, 冨田晃司, 平木隆夫, 内田治仁, 和田淳

中国腎不全研究会誌 32 2024

Kidney Veno-Muscular Characteristics and Kidney Disease Progression: A Native Kidney-Biopsy Study. Reviewed International journal

Kenji Tsuji, Hiroyuki Nakanoh, Kensaku Takahashi, Takafumi Morita, Yizhen Sang, Kazuhiko Fukushima, Natsumi Matsuoka-Uchiyama, Yasuhiro Onishi, Haruhito A Uchida, Shinji Kitamura, Jun Wada

Kidney medicine 5 ( 12 ) 100733 - 100733 2023.12

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

RATIONALE & OBJECTIVE: Assessment of kidney biopsies provides crucial information for diagnosis and disease activity, as well as prognostic value. Kidney-biopsy specimens occasionally contain veno-muscular complex (VMC), which consists of muscle tissues around the kidney venous system in the corticomedullary region. However, the role of VMC and the clinical significance of VMC variants are poorly understood. In the present study, we investigated kidney prognostic values of VMC variants. STUDY DESIGN: Retrospective cohort study. SETTING & PARTICIPANTS: Among 808 patients who underwent a kidney biopsy from 2011 to 2019, 246 patients whose kidney biopsy specimens contained VMC were enrolled. PREDICTORS: VMC variants; inflammatory-VMC (an infiltration of ≥80 inflammatory cells/mm2-VMC area) and VMC hypertrophy (hyper-VMC, a VMC average width ≥850 μm), and the interstitial fibrosis/tubular atrophy (IFTA) score. OUTCOMES: A decline in estimated glomerular filtration rate (eGFR) ≥40% from the baseline or commencement of kidney replacement therapy. ANALYTICAL APPROACH: Cox proportional hazards model. RESULTS: Among 246 patients with data on VMC, mean baseline eGFR was 56.0±25.6 ml/min per 1.73 m2; 80 had high inflammatory-VMC, and 62 had VMC hypertrophy. There were 51 kidney events over median follow-up of 2.5 years. We analyzed 2 VMC variants. Multivariable logistic regression analysis revealed that eGFR negatively correlated with the presence of both inflammatory-VMC and hyper-VMC. A Cox proportional hazards analysis revealed that inflammatory-VMC (but not hyper-VMC) was independently associated with the primary outcome after adjustments for known risk factors of progression, including proteinuria, eGFR, and the interstitial fibrosis/tubular atrophy (IFTA) score (hazard ratio, 1.97; 95% confidence interval, 1.00-3.91). LIMITATIONS: Single-center study and small sample size. CONCLUSIONS: Assessment of inflammatory-VMC provides additional kidney prognostic information to known indicators of kidney disease progression in patients who undergo kidney biopsy. PLAIN-LANGUAGE SUMMARY: Assessment of kidney biopsies provides crucial information for diagnosis, disease activity, and prognostic value. Kidney-biopsy specimens occasionally contain veno-muscular complex (VMC), which consists of muscle tissues around the kidney venous system. Currently, the role of VMC in kidney health and diseases and the clinical significance of VMC variants are poorly understood. In the present study, we have shown that an infiltration of ≥80 inflammatory cells/mm2-VMC area (inflammatory-VMC) is independently associated with kidney disease progression after adjustments for known risk factors of progression. Therefore, assessment of inflammatory-VMC provides additional kidney prognostic information to known indicators of kidney disease progression in patients who undergo kidney biopsy.

DOI： 10.1016/j.xkme.2023.100733

Preventive effect of culture supernatant of epithelial-like peritoneal mesothelial cells on peritoneal fibrosis. Reviewed International journal

Kensaku Takahashi, Kenji Tsuji, Hiroyuki Nakanoh, Kazuhiko Fukushima, Shinji Kitamura, Jun Wada

Peritoneal dialysis international : journal of the International Society for Peritoneal Dialysis 8968608231213577 - 8968608231213577 2023.11

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Peritoneal fibrosis (PF) is a primary reason for discontinuing peritoneal dialysis, which involves characteristic changes of peritoneal mesothelial cells (PMCs). We previously reported preventive effects of implanting human epithelial-like PMCs (P-Epi) for mouse PF caused by mechanical peritoneum scrapings. In the present study, we analysed the preventive effects of culture supernatant of P-Epi in PF. Concentrated culture supernatant of P-Epi or human fibroblast-like PMCs (P-Fibro) or vehicles was injected into nude mice that had undergone mechanical scraping of the parietal and visceral peritoneum, and thickness and amount of adhesions were analysed. Although increased peritoneal adhesions and peritoneum thickening were observed in the vehicle-injected positive control group compared to the sham operation group, fewer number of adhesions and less thickness were observed in the mice treated with culture supernatant of P-Epi, but not P-Fibro, compared to the vehicle-injected positive controls. Immunofluorescent analysis revealed that the expression of extracellular matrix, type I collagen and fibronectin, was lower in the mice treated with culture supernatant of P-Epi than in the vehicle-injected positive controls. In addition, exosomes from P-Epi significantly reduced transforming growth factor-β (TGF-β)-induced expressions of type I collagen and fibronectin in 3T3 fibroblast cells. Collectively, culture supernatant of P-Epi has preventive effects on PF, thus cell therapy is not necessarily required. Further exploration of substances secreted by P-Epi and their protective mechanisms could lead to the development of therapeutic strategies to limit PF.

DOI： 10.1177/08968608231213577

Role of Semaphorin 3A in Kidney Development and Diseases. Reviewed International coauthorship International journal

Yizhen Sang, Kenji Tsuji, Hiroyuki Nakanoh, Kazuhiko Fukushima, Shinji Kitamura, Jun Wada

Diagnostics (Basel, Switzerland) 13 ( 19 ) 2023.9

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

Kidney diseases are worldwide public health problems affecting millions of people. However, there are still limited therapeutic options against kidney diseases. Semaphorin 3A (SEMA3A) is a secreted and membrane-associated protein, which regulates diverse functions, including immune regulation, cell survival, migration and angiogenesis, thus involving in the several pathogeneses of diseases, including eyes and neurons, as well as kidneys. SEMA3A is expressed in podocytes and tubular cells in the normal adult kidney, and recent evidence has revealed that excess SEMA3A expression and the subsequent signaling pathway aggravate kidney injury in a variety of kidney diseases, including nephrotic syndrome, diabetic nephropathy, acute kidney injury, and chronic kidney disease. In addition, several reports have demonstrated that the inhibition of SEMA3A ameliorated kidney injury via a reduction in cell apoptosis, fibrosis and inflammation; thus, SEMA3A may be a potential therapeutic target for kidney diseases. In this review article, we summarized the current knowledge regarding the role of SEMA3A in kidney pathophysiology and their potential use in kidney diseases.

DOI： 10.3390/diagnostics13193038

MicroRNAs as Biomarkers and Therapeutic Targets for Acute Kidney Injury. Reviewed International journal

Kenji Tsuji, Hiroyuki Nakanoh, Kazuhiko Fukushima, Shinji Kitamura, Jun Wada

Diagnostics (Basel, Switzerland) 13 ( 18 ) 2023.9

Authorship：Lead author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Acute kidney injury (AKI) is a clinical syndrome where a rapid decrease in kidney function and/or urine output is observed, which may result in the imbalance of water, electrolytes and acid base. It is associated with poor prognosis and prolonged hospitalization. Therefore, an early diagnosis and treatment to avoid the severe AKI stage are important. While several biomarkers, such as urinary L-FABP and NGAL, can be clinically useful, there is still no gold standard for the early detection of AKI and there are limited therapeutic options against AKI. miRNAs are non-coding and single-stranded RNAs that silence their target genes in the post-transcriptional process and are involved in a wide range of biological processes. Recent accumulated evidence has revealed that miRNAs may be potential biomarkers and therapeutic targets for AKI. In this review article, we summarize the current knowledge about miRNAs as promising biomarkers and potential therapeutic targets for AKI, as well as the challenges in their clinical use.

DOI： 10.3390/diagnostics13182893

Elderly Brothers With Fabry Disease Exhibiting Cardiac and Renal Manifestations Reviewed

Keiko Tanaka, Hitoshi Sugiyama, Hiroshi Morinaga, Akifumi Onishi, Yuzuki Kano, Hidemi Takeuchi, Kenji Tsuji, Motoki Kubo, Katsuyuki Tanabe, Haruhito A. Uchida, Kazufumi Nakamura, Jun Wada

Annals of Internal Medicine: Clinical Cases 2 ( 5 ) 2023.5

The Effect of Medical Cooperation in the CKD Patients: 10-Year Multicenter Cohort Study. Reviewed International journal

Yasuhiro Onishi, Haruhito A Uchida, Yohei Maeshima, Yuka Okuyama, Nozomu Otaka, Haruyo Ujike, Keiko Tanaka, Hidemi Takeuchi, Kenji Tsuji, Masashi Kitagawa, Katsuyuki Tanabe, Hiroshi Morinaga, Masaru Kinomura, Shinji Kitamura, Hitoshi Sugiyama, Kosuke Ota, Keisuke Maruyama, Makoto Hiramatsu, Yoshiyuki Oshiro, Shigeru Morioka, Keiichi Takiue, Kazuyoshi Omori, Masaki Fukushima, Naoyuki Gamou, Hiroshi Hirata, Ryosuke Sato, Hirofumi Makino, Jun Wada

Journal of personalized medicine 13 ( 4 ) 2023.3

Language：English Publishing type：Research paper (scientific journal)

INTRODUCTION: While chronic kidney disease (CKD) is one of the most important contributors to mortality from non-communicable diseases, the number of nephrologists is limited worldwide. Medical cooperation is a system of cooperation between primary care physicians and nephrological institutions, consisting of nephrologists and multidisciplinary care teams. Although it has been reported that multidisciplinary care teams contribute to the prevention of worsening renal functions and cardiovascular events, there are few studies on the effect of a medical cooperation system. METHODS: We aimed to evaluate the effect of medical cooperation on all-cause mortality and renal prognosis in patients with CKD. One hundred and sixty-eight patients who visited the one hundred and sixty-three clinics and seven general hospitals of Okayama city were recruited between December 2009 and September 2016, and one hundred twenty-three patients were classified into a medical cooperation group. The outcome was defined as the incidence of all-cause mortality, or renal composite outcome (end-stage renal disease or 50% eGFR decline). We evaluated the effects on renal composite outcome and pre-ESRD mortality while incorporating the competing risk for the alternate outcome into a Fine-Gray subdistribution hazard model. RESULTS: The medical cooperation group had more patients with glomerulonephritis (35.0% vs. 2.2%) and less nephrosclerosis (35.0% vs. 64.5%) than the primary care group. Throughout the follow-up period of 5.59 ± 2.78 years, 23 participants (13.7%) died, 41 participants (24.4%) reached 50% decline in eGFR, and 37 participants (22.0%) developed end-stage renal disease (ESRD). All-cause mortality was significantly reduced by medical cooperation (sHR 0.297, 95% CI 0.105-0.835, p = 0.021). However, there was a significant association between medical cooperation and CKD progression (sHR 3.069, 95% CI 1.225-7.687, p = 0.017). CONCLUSION: We evaluated mortality and ESRD using a CKD cohort with a long-term observation period and concluded that medical cooperation might be expected to influence the quality of medical care in the patients with CKD.

DOI： 10.3390/jpm13040582

スチレン系軟質樹脂を用いた腎生検シミュレーターの開発と有用性の検討 Reviewed

辻憲二, 喜多村真治, 和田淳

日本腎臓学会誌 65 ( 2 ) 105 - 111 2023.3

Authorship：Lead author,　Corresponding author Language：Japanese Publisher：(一社)日本腎臓学会

超音波ガイド経皮的針腎生検は,種々の腎臓病の診断および活動性の評価のために必要な検査であるが,出血などの合併症のリスクが高い侵襲的な技術であり,実用的なシミュレーションモデルが望まれる。われわれは鶏卵を用いた簡易的腎生検シミュレーターを開発したが,耐久性が低く長期保存が困難であった。今回われわれは幅広く適用されるモデルを目指して,スチレン系軟質樹脂を用いた新たな腎生検シミュレーターを開発した。作製したモデルは,超音波下で腎臓の皮質・髄質に該当する部分のコントラストは実際の腎臓のものに類似しており,針穿刺の際にモデル内に針が侵入する様子が超音波下で観察可能であった。本モデルの検証のため,岡山大学病院の腎生検経験20例未満の研修生10名に腎生検模擬を実施し,腎生検経験20例以上の腎生検に熟達した腎臓内科医20名がその様子を観察あるいは模擬を実施した。また,腎生検模擬後に全参加者にアンケート調査を実施した。90%の研修生が,今回の腎生検模擬によって患者への腎生検に対する不安が軽減されると回答した。また,すべての参加者が,研修生が本腎生検模擬を行うことを推奨すると回答した。耐久性の評価では,約100回穿刺後の形態および超音波下の画像ともに継続使用可能と考えられた。以上から,開発したシミュレーターは腎生検の実用的なシミュレーションモデルの良い候補になり得る。(著者抄録)

Association between Urinary Creatinine Excretion and Hypothyroidism in Patients with Chronic Kidney Disease. Reviewed International journal

Natsumi Matsuoka-Uchiyama, Kenji Tsuji, Kensaku Takahashi, Kazuhiko Fukushima, Hidemi Takeuchi, Shinji Kitamura, Kenichi Inagaki, Haruhito A Uchida, Jun Wada

Diagnostics (Basel, Switzerland) 13 ( 4 ) 2023.2

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

While hypothyroidism increases serum creatinine (Cr) levels, it is uncertain whether the elevation is mediated via a decline in the glomerular filtration rate (GFR) or the reflection of enhanced Cr production from the muscles or both. In the present study, we explored an association between urinary Cr excretion rate (CER) and hypothyroidism. A total of 553 patients with chronic kidney disease were enrolled in a cross-sectional study. Multiple linear regression analysis was performed to explore the association between hypothyroidism and urinary CER. The mean urinary CER was 1.01 ± 0.38 g/day and 121 patients (22%) had hypothyroidism. The multiple linear regression analysis revealed explanatory variables with urinary CER, including age, sex, body mass index, 24 h Cr clearance (24hrCcr), and albumin while hypothyroidism was not considered an independent explanatory variable. In addition, scatter plot analysis with regression fit line representing the association between estimated GFR calculated using s-Cr (eGFRcre) and 24hrCcr revealed that eGFRcre and 24hrCcr had strong correlations with each other in hypothyroid patients as well as euthyroid patients. Collectively, hypothyroidism was not considered an independent explanatory variable for urinary CER in the present study and eGFRcre is a useful marker to evaluate kidney function regardless of the presence of hypothyroidism.

DOI： 10.3390/diagnostics13040669

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