• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Functional analysis of MLCK during insulin secretion in islet beta cells

Research Project

Project/Area Number 17K08651
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Pathological medical chemistry
Research InstitutionTokyo Medical and Dental University

Principal Investigator

Fujikawa Makoto  東京医科歯科大学, 大学院医歯学総合研究科, 助教 (90573048)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2017: ¥2,340,000 (Direct Cost: ¥1,800,000、Indirect Cost: ¥540,000)
Keywords糖尿病 / インスリン分泌 / ATP / エネルギー代謝 / GSIS / ATP合成 / インスリン
Outline of Final Research Achievements

It it known that intracellular calcium and ATP increase in islet beta cells during insulin secretion after eating. Moreover, actin-myosin contraction (eg muscle) is regulated by MLCK, which is calcium-responsive protein kinase. It is reported that the MLCK is relative to insulin secretion. Then, we established MLCK knockdown cell lines and checked the secretion activity. MLCK-knockdonw cells have lower activities of insulin secretion and ATP synthesis in mitochondria. However, intracellular ATP levels in MLCK-konckdown cells are higher than ones in the control cells, in contrary to our expectation.

Academic Significance and Societal Importance of the Research Achievements

インスリン分泌において細胞内ATP量の上昇は重要であるが、少なくともMLCKのインスリン分泌に果たす機能についてはATP量変化とは区別されるべきである。今回は2つの疑問が解明できなかった。1つはミトコンドリアATP合成酵素が阻害されても細胞内ATP量が増加すること。もう1つは細胞内ATP量がインスリン分泌に重要なレベルに達してもMLCKを阻害するとインスリン分泌が低下すること。前者は解糖系ーミトコンドリアによるATP合成系とATP消費との総合的な研究がエネルギー代謝制御の分野において益々必要である。後者はMLCKはATP亢進後の段階 (分泌顆粒の輸送など)で重要な役割を担っていると結論づける。

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report

URL: 

Published: 2017-04-28   Modified: 2021-02-19  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi