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Regulatory mechanism of mTORC1 activity in pancreatic beta cells in the development of type 2 diabetes

Research Project

Project/Area Number 20K08860
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 54040:Metabolism and endocrinology-related
Research InstitutionKobe University

Principal Investigator

Asahara Shun-ichiro  神戸大学, 医学部附属病院, 助教 (00570342)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2021: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywords膵β細胞 / 可塑性 / mTORC1 / 糖尿病 / 膵島 / 脱分化 / 2型糖尿病
Outline of Research at the Start

本研究では、高脂肪食負荷GCN2欠損マウスを用いて以下の解明を目指す。
・膵β細胞におけるmTORC1活性亢進経路の解明
・膵β細胞のmTORC1活性調節に及ぼす新規機序の解明
また、ヒトiPS細胞由来の膵β細胞やヒト膵島を用いることによって、EIF2AK4遺伝子のSNP の存在がモデルマウスの結果と合致することを確認する。

Outline of Final Research Achievements

Although the mechanism of pancreatic β-cell volume reduction has not yet been elucidated, mTORC1 activation in islets of type 2 diabetes patients is thought to be involved. In this study, we analyzed pancreatic β-cell-specific TSC2 knockout (βTSC2KO). βTSC2KO showed an increase in chromogranin A-positive and islet hormone-negative cells, suggesting a differentiation effect. βTSC2KO islets showed amylase-positive cells, which were associated with the exocrine cells, and co-positivity of Ptf1a and chromogranin A, a transcription factor of exocrine cells, was also observed. These results suggest that homeostatic activation of mTORC1 may cause a decrease in β-cells by converting them into exocrine cells in old age.

Academic Significance and Societal Importance of the Research Achievements

糖尿病は1型、2型いずれにおいても、膵β細胞量が発症において重要な因子となる。膵β細胞量減少機序については、これまでに多くの報告があるが、いまだに臨床応用されるようなものはない。代表者は糖尿病膵島でmTORC1が活性化されていることに注目し、mTORC1活性調節を制御することが出来れば、1型糖尿病の根治や2型糖尿病の発症予測ができるのではないかと考えた。本研究を進展させることによって、将来的な膵β細胞不全の治療・予防につながるものと期待している。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (16 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (14 results) (of which Int'l Joint Research: 4 results,  Peer Reviewed: 14 results,  Open Access: 14 results) Presentation (1 results)

  • [Int'l Joint Research] Columbia University(米国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Chlorogenic Acid and Caffeine in Coffee Restore Insulin Signaling in Pancreatic Beta Cells2023

    • Author(s)
      Ihara Y, Asahara SI, Inoue H, Seike M, Ando M, Kabutoya H, Kimura-Koyanagi M, Kido Y.
    • Journal Title

      Kobe J Med Sci.

      Volume: 69

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] A case of multiple glucagonomas with no clinical manifestations of excess glucagon despite hyperglucagonemia2023

    • Author(s)
      Amano S, Suenaga S, Hamamoto K, Yada S, Tsuyama T, Shinoda S, Tanaka Y, Takemoto Y, Harada E, Tanabe K, Asahara S, Hoshii K, Takami T.
    • Journal Title

      DEN Open

      Volume: 3 Issue: 1

    • DOI

      10.1002/deo2.230

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] l-Asparaginase regulates mTORC1 activity via a TSC2-dependent pathway in pancreatic beta cells2023

    • Author(s)
      Seike M, Asahara SI, Inoue H, Kudo M, Kanno A, Yokoi A, Suzuki H, Kimura-Koyanagi M, Kido Y, Ogawa W.
    • Journal Title

      Biochem Biophys Res Commun.

      Volume: 652 Pages: 121-130

    • DOI

      10.1016/j.bbrc.2023.02.035

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cyb5r3-based mechanism and reversal of secondary failure to sulfonylurea in diabetes2023

    • Author(s)
      Watanabe H, Du W, Son J, Sui L, Asahara SI, Kurland IJ, Kuo T, Kitamoto T, Miyachi Y, de Cabo R, Accili D.
    • Journal Title

      Sci Transl Med.

      Volume: 15 Issue: 681

    • DOI

      10.1126/scitranslmed.abq4126

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The transcription factor ATF3 switches cell death from apoptosis to necroptosis in hepatic steatosis in male mice2023

    • Author(s)
      Inaba Yuka、Hashiuchi Emi、Watanabe Hitoshi、Kimura Kumi、Oshima Yu、Tsuchiya Kohsuke et al.
    • Journal Title

      Nature Communications

      Volume: 14 Issue: 1 Pages: 167-167

    • DOI

      10.1038/s41467-023-35804-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Regulation of Pancreatic β-Cell Mass by Gene-Environment Interaction2022

    • Author(s)
      Asahara SI, Inoue H, Kido Y.
    • Journal Title

      Diabetes Metab J

      Volume: 46 Issue: 1 Pages: 38-48

    • DOI

      10.4093/dmj.2021.0045

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Roles of mTOR in the Regulation of Pancreatic β-Cell Mass and Insulin Secretion2022

    • Author(s)
      Asahara S, Inoue H, Watanabe H, Kido Y.
    • Journal Title

      Biomolecules

      Volume: 12 Issue: 5 Pages: 618-618

    • DOI

      10.3390/biom12050614

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Glutamate is an essential mediator in glutamine‐amplified insulin secretion2021

    • Author(s)
      Han Guirong、Takahashi Harumi、Murao Naoya、Gheni Ghupurjan、Yokoi Norihide、Hamamoto Yoshiyuki、Asahara Shun‐ichiro、Seino Yutaka、Kido Yoshiaki、Seino Susumu
    • Journal Title

      Journal of Diabetes Investigation

      Volume: - Issue: 6 Pages: 920-930

    • DOI

      10.1111/jdi.13497

    • NAID

      120007097043

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Patch-seq shows the heterogeneity of pancreatic islet cells.2021

    • Author(s)
      Asahara S
    • Journal Title

      J Diabetes Investig.

      Volume: - Issue: 5 Pages: 691-693

    • DOI

      10.1111/jdi.13514

    • NAID

      120007032320

    • Related Report
      2021 Research-status Report 2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Oral administration of D-serine prevents the onset and progression of colitis in mice.2021

    • Author(s)
      Takehito Asakawa, Michio Onizawa, Chikako Saito, Rie Hikichi, Daiki Yamada, Ai Minamidate, Tomoaki Mochimaru, Shun-ichiro Asahara, Yoshiaki Kido, Shigeru Oshima, Takashi Nagaishi, Kiichiro Tsuchiya, Hiromasa Ohira, Ryuichi Okamoto, Mamoru Watanabe.
    • Journal Title

      Journal of Gastroenterolog.

      Volume: 56 Issue: 8 Pages: 732-745

    • DOI

      10.1007/s00535-021-01792-1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Histone deacetylase 6 regulates insulin signaling in pancreatic β cells2021

    • Author(s)
      Inoue H, Asahara SI, Sugiura Y, Kawada Y, Imai A, Hara C, Kanno A, Kimura-Koyanagi M, Kido Y.
    • Journal Title

      Biochem Biophys Res Commun .

      Volume: 534 Pages: 896-901

    • DOI

      10.1016/j.bbrc.2020.10.078

    • NAID

      120007033584

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Sex difference in the association of obesity with personal or social background among urban residents in Japan2020

    • Author(s)
      Asahara SI, Miura H, Ogawa W, Tamori Y.
    • Journal Title

      PLoS One.

      Volume: 15 Issue: 11 Pages: e0242105-e0242105

    • DOI

      10.1371/journal.pone.0242105

    • NAID

      120006938919

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] GCN2 regulates pancreatic β-cell mass by sensing intracellular amino acid levels.2020

    • Author(s)
      Kanno A, Asahara SI, Furubayashi A, Masuda K, Yoshitomi R, Suzuki E, Takai T, Kimura-Koyanagi M, Matsuda T, Bartolome A, Hirota Y, Yokoi N, Inaba Y, Inoue H, Matsumoto M, Inoue K, Abe T, Wei FY, Tomizawa K, Ogawa W, Seino S, Kasuga M, Kido Y.
    • Journal Title

      JCI Insight.

      Volume: 5 Issue: 9 Pages: 128820-128820

    • DOI

      10.1172/jci.insight.128820

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Association between mean platelet volume in the pathogenesis of type 2 diabetes mellitus and diabetic macrovascular complications in Japanese patients.2019

    • Author(s)
      Inoue H, Saito M, Kouchi K, Asahara SI, Nakamura F, Kido Y.
    • Journal Title

      J. Diab. Invest.

      Volume: - Issue: 4 Pages: 938-945

    • DOI

      10.1111/jdi.13198

    • NAID

      120006876706

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 2型糖尿病感受性遺伝子Kcnq1遺伝子領域による膵β細胞量調節機構の解明2020

    • Author(s)
      原千佐子、淺原俊一郎、木戸良明
    • Organizer
      第63回日本糖尿病学会年次学術集会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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