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Elucidation of simultaneous secretion mechanism of insulin and incretin and its significance for drug discovery application

Research Project

Project/Area Number 18K08474
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 InstitutionKyoto University

Principal Investigator

Harashima Shinichi  京都大学, 医学研究科, 客員研究員 (80444793)

Project Period (FY) 2018-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2019: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2018: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
Keywordsインスリン分泌 / インクレチン分泌 / 炎症 / 肥満 / SKIP / インスリン / インクレチン / 脂質代謝 / 2型糖尿病 / 創薬
Outline of Final Research Achievements

Sphingosine kinase 1 interacting protein (SKIP) is expressed in pancreatic b‐cells, and intestinal K‐ and L‐cells. Secretion of GIP) and GLP‐1as well as insulin are significantly increased, and blood glucose levels are decreased in SKIP‐deficient (SKIP-/-) mice compared with those in wild‐type mice. Plasma triglyceride, LDL cholesterol, and proinflammatory cytokines in adipose tissues, livers, and intestines were significantly decreased in SKIP-/- mice. In summary, depletion of SKIP ameliorates glucose tolerance by enhancing secretion of insulin and incretins, improves lipid metabolism, and reduces basal inflammation levels. Thus, inhibition of SKIP action may emerge as a new option for treatment of type 2 diabetes mellitus with metabolic dysfunction.

Academic Significance and Societal Importance of the Research Achievements

2型糖尿病の病態には、グルコース応答性インスリン分泌の低下とインクレチン効果の減弱が関与しているとされている。そのことから、糖尿病の薬物治療では、インスリン分泌を促す治療やインクレチン分泌を促す治療が主に選択される。とくに、日本人を含めたアジア人は、インスリン分泌の低下とインクレチン作用の減弱を補う治療が効果があり、インスリン分泌とインクレチン分泌を促す同時に促す治療は2型糖尿病の理想的な治療と言える。最近では、注射薬であるが、基礎インスリンとGLP-1受容体作動薬の配合注で治療が実践されている。SKIPがその治療選択の一つになる可能性が本研究で示され、その意義は大きいと考えている。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (2 results)

All 2019 2018

All Journal Article (1 results) (of which Peer Reviewed: 1 results) Presentation (1 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Whole-exome sequencing in a Japanese family with highly aggregated diabetes identifies a candidate susceptibility mutation in ADAMTSL3.2018

    • Author(s)
      Jambaljav B. Tanaka D. Nagashima K. Harashima SI. Harada N. Harada T. Fujiwara Y. Wang Y. Liu Y. Tabara Y. Matsuda F. Koizumi A. Inagaki N.
    • Journal Title

      Diabetes Res Clin Pracy.

      Volume: 135 Pages: 143-149

    • DOI

      10.1016/j.diabres.2017.11.012

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] Sphingosine kinase 1-interacting protein is a dual regulator of insulin and incretin secretion2019

    • Author(s)
      Liu Y, Harashima S, Yabe D, Inagaki N.
    • Organizer
      Asian Islet Biology & Incretin Symposium 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2018-04-23   Modified: 2022-01-27  

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