研究者詳細 - 中山　真彰

論文 - 中山　真彰

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Double-faced CX3CL1 enhances lymphangiogenesis-dependent metastasis in an aggressive subclone of oral squamous cell carcinoma. 国際誌

Htoo Shwe Eain, Hotaka Kawai, Masaaki Nakayama, May Wathone Oo, Toshiaki Ohara, Yoko Fukuhara, Kiyofumi Takabatake, Quisheng Shan, Yamin Soe, Kisho Ono, Keisuke Nakano, Nobuyoshi Mizukawa, Seiji Iida, Hitoshi Nagatsuka

JCI insight 9 ( 10 ) 2024年5月

記述言語：英語掲載種別：研究論文（学術雑誌）

Because cancer cells have a genetically unstable nature, they give rise to genetically different variant subclones inside a single tumor. Understanding cancer heterogeneity and subclone characteristics is crucial for developing more efficacious therapies. Oral squamous cell carcinoma (OSCC) is characterized by high heterogeneity and plasticity. On the other hand, CX3C motif ligand 1 (CX3CL1) is a double-faced chemokine with anti- and pro-tumor functions. Our study reported that CX3CL1 functioned differently in tumors with different cancer phenotypes, both in vivo and in vitro. Mouse OSCC 1 (MOC1) and MOC2 cells responded similarly to CX3CL1 in vitro. However, in vivo, CX3CL1 increased keratinization in indolent MOC1 cancer, while CX3CL1 promoted cervical lymphatic metastasis in aggressive MOC2 cancer. These outcomes were due to double-faced CX3CL1 effects on different immune microenvironments indolent and aggressive cancer created. Furthermore, we established that CX3CL1 promoted cancer metastasis via the lymphatic pathway by stimulating lymphangiogenesis and transendothelial migration of lymph-circulating tumor cells. CX3CL1 enrichment in lymphatic metastasis tissues was observed in aggressive murine and human cell lines. OSCC patient samples with CX3CL1 enrichment exhibited a strong correlation with lower overall survival rates and higher recurrence and distant metastasis rates. In conclusion, CX3CL1 is a pivotal factor that stimulates the metastasis of aggressive cancer subclones within the heterogeneous tumors to metastasize, and our study demonstrates the prognostic value of CX3CL1 enrichment in long-term monitoring in OSCC.

DOI： 10.1172/jci.insight.174618

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Novel Iron Chelators, Super-Polyphenols, Show Antimicrobial Effects against Cariogenic Streptococcus mutans. 国際誌

Yuki Shinoda-Ito, Kazuhiro Omori, Takashi Ito, Masaaki Nakayama, Atsushi Ikeda, Masahiro Ito, Toshiaki Ohara, Shogo Takashiba

Antibiotics (Basel, Switzerland) 12 ( 11 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Dental caries are an oral infectious disease that can affect human health both orally and systemically. It remains an urgent issue to establish a novel antibacterial method to prevent oral infection for a healthy life expectancy. The aim of this study was to evaluate the inhibitory effects of novel iron chelators, super-polyphenols (SPs), on the cariogenic bacterium Streptococcus mutans, in vitro. SPs were developed to reduce the side effects of iron chelation therapy and were either water-soluble or insoluble depending on their isoforms. We found that SP6 and SP10 inhibited bacterial growth equivalent to povidone-iodine, and viability tests indicated that their effects were bacteriostatic. These results suggest that SP6 and SP10 have the potential to control oral bacterial infections such as Streptococcus mutans.

DOI： 10.3390/antibiotics12111562

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Novel Iron Chelators, Super-Polyphenols, Show Antimicrobial Effects against Cariogenic Streptococcus mutans. 国際誌

Yuki Shinoda-Ito, Kazuhiro Omori, Takashi Ito, Masaaki Nakayama, Atsushi Ikeda, Masahiro Ito, Toshiaki Ohara, Shogo Takashiba

Antibiotics (Basel, Switzerland) 12 ( 11 ) 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3390/antibiotics12111562

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Association of illness perception and alexithymia with fatigue in hemodialysis recipients: a single-center, cross-sectional study. 国際誌

Yoko Tanemoto, Ui Yamada, Masaaki Nakayama, Takeaki Takeuchi, Fumiaki Tanemoto, Yugo Ito, Daiki Kobayashi, Daisuke Ohta, Masahiro Hashizume

Scientific reports 13 ( 1 ) 16592 - 16592 2023年10月

記述言語：英語掲載種別：研究論文（学術雑誌）

Fatigue in hemodialysis recipients interferes with daily activities and renal rehabilitation, and its underlying causes and treatment remain unclear. Psychological factors, like illness perceptions and alexithymia, cause fatigue in other diseases; however, their contribution to hemodialysis-related fatigue is unknown. This cross-sectional study included 53 hemodialysis recipients. To assess participants' fatigue, we used a self-administered patient-reported outcome questionnaire whose items have shown correlation with those of established scales, such as the Profile of Mood States and Visual Analogue Scales. The associations among the scores of the revised Illness Perceptions Questionnaire (IPQ-R), Toronto Alexithymia Scale (TAS-20), and Hospital Anxiety and Depression Scale and fatigue were analyzed using bivariable and multivariable analyses. Patients with fatigue had significantly higher median scores for the IPQ-R subscales "Identity" and "Negative emotional representation about illness" than those without fatigue, suggesting the association of specific illness perception with fatigue. Median scores for the TAS-20 subscale "Difficulty identifying feelings" were also significantly higher among fatigued patients, suggesting the association of alexithymia with fatigue. Depression was not associated with fatigue. Multivariable logistic regression revealed the association of a high "Identity" score with the risk of fatigue (adjusted odds ratio, 1.32; 95% confidence interval, 1.00-1.73; P = 0.04), while there were no significant association between a high "Difficulty identifying feelings" score and the risk of fatigue (adjusted odds ratio, 1.09; 95% confidence interval, 0.95-1.24). Specific illness perception and alexithymia were slightly associated with hemodialysis-related fatigue. Cognitive-behavioral therapy for these conditions could reduce fatigue and promote renal rehabilitation.

DOI： 10.1038/s41598-023-43935-9

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Pathophysiology of encapsulating peritoneal sclerosis: lessons from findings of the past three decades in Japan.

Masaaki Nakayama, Masanobu Miyazaki, Chieko Hamada, Yasuhiko Ito, Kazuho Honda

Clinical and experimental nephrology 27 ( 9 ) 717 - 727 2023年9月

記述言語：英語掲載種別：研究論文（学術雑誌）

Encapsulating peritoneal sclerosis (EPS), a condition with a high mortality rate, is a serious complication of peritoneal dialysis (PD). In Japan, EPS became a central issue in the clinical setting during the mid-90s and the beginning of this century. However, following the introduction of biocompatible neutral PD solutions containing lower levels of glucose degradation products, the incidence and clinical severity of EPS has been greatly lessened. During the past three decades, the etiology of EPS has been elucidated by findings obtained by peritoneal biopsy, laparoscopy, and surgical intervention. Accumulating findings suggest the need for a paradigm change on the nature of EPS pathophysiology; notably, EPS appears not to reflect peritoneal sclerosis per se, but rather the formation of a neo-membrane as a biological reaction to peritoneal injury. This narrative review looks back on the history of EPS in Japan, and discusses EPS pathophysiology, the impact of neutral PD solution on peritoneal protection, and a future novel diagnostic approach, ultra-fine endoscope, for the identification of patients at high risk of EPS.

DOI： 10.1007/s10157-023-02360-y

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口腔癌におけるCX3CL1とリンパ節転移の関係(Relationship between CX3CL1 and lymph node metastasis in oral cancer)

河合穂高, トゥ・シュエイン, 中山真彰, 大原利章, 長塚仁

日本癌学会総会記事 82回 1421 - 1421 2023年9月

口腔癌におけるCX3CL1とリンパ節転移の関係(Relationship between CX3CL1 and lymph node metastasis in oral cancer)

河合穂高, トゥ・シュエイン, 中山真彰, 大原利章, 長塚仁

日本癌学会総会記事 82回 1421 - 1421 2023年9月

The Fungal Metabolite (+)-Terrein Abrogates Inflammatory Bone Resorption via the Suppression of TNF-α Production in a Ligature-Induced Periodontitis Mouse Model

Hidefumi Sako, Kazuhiro Omori, Masaaki Nakayama, Hiroki Mandai, Hidetaka Ideguchi, Saki Yoshimura-Nakagawa, Kyosuke Sakaida, Chiaki Nagata-Kamei, Hiroya Kobayashi, Satoki Ishii, Mitsuaki Ono, Soichiro Ibaragi, Tadashi Yamamoto, Seiji Suga, Shogo Takashiba

Journal of Fungi 9 ( 3 ) 314 - 314 2023年3月

掲載種別：研究論文（学術雑誌）出版者・発行元：MDPI AG

Current periodontal treatment focuses on the mechanical removal of the source of infection, such as bacteria and their products, and there is no approach to control the host inflammatory response that leads to tissue destruction. In order to control periodontal inflammation, we have previously reported the optimization of (+)-terrein synthesis methods and the inhibitory effect of (+)-terrein on osteoclast differentiation in vitro. However, the pharmacological effect of (+)-terrein in vivo in the periodontitis model is still unknown. In this study, we investigated the effect of synthetic (+)-terrein on inflammatory bone resorption using a ligature-induced periodontitis mouse model. Synthetic (+)-terrein (30 mg/kg) was administered intraperitoneally twice a week to the mouse periodontitis model. The control group was treated with phosphate buffer. One to two weeks after the induction of periodontitis, the periodontal tissues were harvested for radiological evaluation (micro-CT), histological evaluation (HE staining and TRAP staining), and the evaluation of inflammatory cytokine production in the periodontal tissues and serum (quantitative reverse-transcription PCR, ELISA). The synthetic (+)-terrein-treated group suppressed alveolar bone resorption and the number of osteoclasts in the periodontal tissues compared to the control group (p < 0.05). In addition, synthetic (+)-terrein significantly suppressed both mRNA expression of TNF-α in the periodontal tissues and the serum concentration of TNF-α (both p < 0.05). In conclusion, we have demonstrated that synthetic (+)-terrein abrogates alveolar bone resorption via the suppression of TNF-α production and osteoclast differentiation in vivo. Therefore, we could expect potential clinical effects when using (+)-terrein on inflammatory bone resorption, including periodontitis.

DOI： 10.3390/jof9030314

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The Fungal Metabolite (+)-Terrein Abrogates Inflammatory Bone Resorption via the Suppression of TNF-α Production in a Ligature-Induced Periodontitis Mouse Model. 国際誌

Journal of fungi (Basel, Switzerland) 9 ( 3 ) 2023年3月

記述言語：英語掲載種別：研究論文（学術雑誌）

DOI： 10.3390/jof9030314

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侵襲性歯周炎の血液診断マーカー候補となる細胞外小胞由来マイクロRNAとその炎症誘導機構の探索

森彩乃, 山本直史, 井手口英隆, 河村麻理, 河本美奈, 伊東昌洋, 小野喜章, 中山真彰, 江口傑徳, 大野充昭, 大森一弘, 高柴正悟

日本歯周病学会会誌 64 ( 春季特別 ) 114 - 114 2022年5月

Porphyromonas gingivalis Gingipains Induce Cyclooxygenase-2 Expression and Prostaglandin E2 Production via ERK1/2-Activated AP-1 (c-Jun/c-Fos) and IKK/NF-κB p65 Cascades. 査読国際誌

Masaaki Nakayama, Mariko Naito, Kazuhiro Omori, Shintaro Ono, Koji Nakayama, Naoya Ohara

Journal of immunology (Baltimore, Md. : 1950) 208 ( 5 ) 1146 - 1154 2022年3月

担当区分：筆頭著者記述言語：英語掲載種別：研究論文（学術雑誌）

Porphyromonas gingivalis is commonly known as one of the major pathogens contributing to periodontitis, and its persistent infection may increase the risk for the disease. The proinflammatory mediators, including IL-6, TNF-α, and cyclooxygenase-2 (COX-2)/PGE2, are closely associated with progression of periodontitis. In this study, we focused on the cysteine protease "gingipains," lysine-specific gingipain, arginine-specific gingipain (Rgp) A, and RgpB, produced by P. gingivalis, and used the wild-type strain and several gene-deletion mutants (rgpA, rgpB, kgp, and fimA) to elucidate the involvement of gingipains in COX-2 expression and PGE2 production. We infected human monocytes, which are THP-1 cells and primary monocytes, with these bacterial strains and found that gingipains were involved in induction of COX-2 expression and PGE2 production. We have shown that the protease activity of gingipains was crucial for these events by using gingipain inhibitors. Furthermore, activation of ERK1/2 and IκB kinase was required for gingipain-induced COX-2 expression/PGE2 production, and these kinases activated two transcription factors, c-Jun/c-Fos (AP-1) and NF-κB p65, respectively. In particular, these data suggest that gingipain-induced c-Fos expression via ERK is essential for AP-1 formation with c-Jun, and activation of AP-1 and NF-κB p65 plays a central role in COX-2 expression/PGE2 production. Thus, we show the (to our knowledge) novel finding that gingipains with the protease activity from P. gingivalis induce COX-2 expression and PGE2 production via activation of MEK/ERK/AP-1 and IκB kinase/NF-κB p65 in human monocytes. Hence it is likely that gingipains closely contribute to the inflammation of periodontal tissues.

DOI： 10.4049/jimmunol.2100866

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Attempt of thyX gene silencing and construction of a thyX deleted clone in a Mycobacterium bovis BCG 査読

Yuki Arimura, Yusuke Minato, Takayuki Wada, Masaaki Nakayama, Ayako Ryumon, Nao Hirata, Chie Nakajima, Yasuhiko Suzuki, Manabu Ato, Kazuo Kobayashi, Naoko Ohara, Seiji Iida, Naoya Ohara

Microbiology and Immunology 66 ( 1 ) 10 - 14 2022年1月

Attempt of thyX gene silencing and construction of a thyX deleted clone in a Mycobacterium bovis BCG. 国際誌

Yuki Arimura, Yusuke Minato, Takayuki Wada, Masaaki Nakayama, Ayako Ryumon, Nao Hirata, Chie Nakajima, Yasuhiko Suzuki, Manabu Ato, Kazuo Kobayashi, Naoko Ohara, Seiji Iida, Naoya Ohara

Microbiology and immunology 66 ( 1 ) 10 - 14 2022年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Mycobacterium tuberculosis, the causative agent of tuberculosis, possess flavin-dependent thymidylate synthase, ThyX. Since thyX is absent in humans and was shown to be essential for M. tuberculosis normal growth, ThyX is thought to be an attractive novel TB drug target. This study assessed thyX essentiality in Mycobacterium bovis BCG strains using CRISPR interference based gene silencing and found that thyX is not essential in an M. bovis BCG Tokyo derivative strain. A thyX deletion mutant strain was successfully constructed from that strain, which reinforces the non-essentiality of thyX under a certain genetic background.

DOI： 10.1111/1348-0421.12944

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GRIM-19 is a target of mycobacterial Zn2+ metalloprotease 1 and indispensable for NLRP3 inflammasome activation. 国際誌

Tomomi Kurane, Tetsuro Matsunaga, Tomoaki Ida, Kazuko Sawada, Akira Nishimura, Masayuki Fukui, Masayuki Umemura, Masaaki Nakayama, Naoya Ohara, Sohkichi Matsumoto, Takaaki Akaike, Goro Matsuzaki, Giichi Takaesu

FASEB journal : official publication of the Federation of American Societies for Experimental Biology 36 ( 1 ) e22096 2022年1月

記述言語：英語掲載種別：研究論文（学術雑誌）

Tuberculosis is a communicable disease caused by Mycobacterium tuberculosis which primarily infects macrophages and establishes intracellular parasitism. A mycobacterial virulence factor Zn2+ metalloprotease 1 (Zmp1) is known to suppress interleukin (IL)-1β production by inhibiting caspase-1 resulting in phagosome maturation arrest. However, the molecular mechanism of caspase-1 inhibition by Zmp1 is still elusive. Here, we identified GRIM-19 (also known as NDUFA13), an essential subunit of mitochondrial respiratory chain complex I, as a novel Zmp1-binding protein. Using the CRISPR/Cas9 system, we generated GRIM-19 knockout murine macrophage cell line J774.1 and found that GRIM-19 is essential for IL-1β production during mycobacterial infection as well as in response to NLRP3 inflammasome-activating stimuli such as extracellular ATP or nigericin. We also found that GRIM-19 is required for the generation of mitochondrial reactive oxygen species and NLRP3-dependent activation of caspase-1. Loss of GRIM-19 or forced expression of Zmp1 resulted in a decrease in mitochondrial membrane potential. Our study revealed a previously unrecognized role of GRIM-19 as an essential regulator of NLRP3 inflammasome and a molecular mechanism underlying Zmp1-mediated suppression of IL-1β production during mycobacterial infection.

DOI： 10.1096/fj.202101074RR

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GRIM-19 is a target of mycobacterial Zn2+ metalloprotease 1 and indispensable for NLRP3 inflammasome activation 査読

The FASEB Journal 2021年12月

フッ化ナトリウムによるCCNファミリー遺伝子制御を介した歯肉線維化抑制作用の検討

水川朋美, 西田崇, 明石翔, 大杉綾花, 大森一弘, 中山真彰, 高柴正悟, 上岡寛, 滝川正春, 久保田聡

岡山歯学会雑誌 40 ( 2 ) 34 - 35 2021年12月

Attempt of thyX gene silencing and construction of a thyX deleted clone in a Mycobacterium bovis BCG. 査読

Yuki Arimura, Yusuke Minato, Takayuki Wada, Masaaki Nakayama, Ayako Ryumon, Nao Hirata, Chie Nakajima, Yasuhiko Suzuki, Manabu Ato, Kazuo Kobayashi, Naoko Ohara, Seiji Iida, Naoya Ohara

Microbiol Immunol. 2021年9月

The fungal metabolite (+)-terrein abrogates ovariectomy-induced bone loss and receptor activator of nuclear factor-κB ligand–induced osteoclastogenesis by suppressing protein kinase-C α/βII phosphorylation. 査読国際誌

Kyosuke Sakaida, Kazuhiro Omori, Masaaki Nakayama, Hiroki Mandai, Saki Nakagawa, Hidefumi Sako, Chiaki Kamei, Satoshi Yamamoto, Hiroya Kobayashi, Satoki Ishii, Mitsuaki Ono, Soichiro Ibaragi, Keisuke Yamashiro, Tadashi Yamamoto, Seiji Suga and Shogo Takashiba

Frontiers in Pharmacology 12 674366 - 674366 2021年6月

Point mutation in the stop codon of MAV_RS14660 increases the growth rate of Mycobacterium avium subspecies hominissuis. 査読

Tomomi Kawakita, Tetsu Mukai, Mitsunori Yoshida, Hiroyuki Yamada, Masaaki Nakayama, Yuji Miyamoto, Masato Suzuki, Noboru Nakata, Takemasa Takii, Akihide Ryo, Naoya Ohara, Manabu Ato

Microbiology 167 ( 2 ) 2021年2月

Point mutation in the stop codon of MAV_RS14660 increases the growth rate of Mycobacterium avium subspecies hominissuis. 国際誌

Tomomi Kawakita, Tetsu Mukai, Mitsunori Yoshida, Hiroyuki Yamada, Masaaki Nakayama, Yuji Miyamoto, Masato Suzuki, Noboru Nakata, Takemasa Takii, Akihide Ryo, Naoya Ohara, Manabu Ato

Microbiology (Reading, England) 167 ( 2 ) 2021年2月

記述言語：英語掲載種別：研究論文（学術雑誌）

Mycobacterium avium subspecies hominissuis (MAH) is a pathogen that causes various non-tuberculous mycobacterial diseases in humans and animals worldwide. Among the genus, MAH is characterized by relatively slow growth. Here, we isolated a rapidly growing variant of the MAH 104 strain. The variant strain (named N104) exhibited an enhanced growth rate and higher motility compared to the parent MAH 104 strain (P104). Whole-genome sequencing analysis of N104 revealed the loss of the stop codon of MAV_RS14660 due to a single nucleotide replacement, resulting in the substitution of the codon for tryptophan. Notably, exclusion of the stop codon ligated the open reading frames and caused the fusion of two adjacent proteins. A revertant parent strain, in which a mutation was introduced to restore the stop codon, revealed that elimination of the stop codon in MAV_RS14660 was responsible for the N104 phenotype. Furthermore, we analysed the phenotypes of the parent and mutated strains by determining the functions of the MAV_RS14660 and MAV_RS14655 coding regions flanking the stop codon. The mutant strains, expected to express a fusion protein, exhibited increased resistance to antimicrobial drugs and exogenous copper toxicity compared to that of the parent strains. These findings suggest that the fusion of the MAV_RS14660- and MAV_RS14655-encoding regions in the mutant N104 strain could be related to the modified functions of these intrinsic proteins.

DOI： 10.1099/mic.0.001007

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