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The role of calcium-sensing receptors in the regulation of pancreatic beta cell and intestinal epithelial cell function.

Research Project

Project/Area Number 18K16234
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 54040:Metabolism and endocrinology-related
Research InstitutionThe University of Tokushima

Principal Investigator

KURAHASHI Kiyoe  徳島大学, 大学院医歯薬学研究部(医学域), 助教 (30567342)

Project Period (FY) 2018-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2018: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords糖尿病 / 膵β細胞 / カルシウム感知受容体 / Calcilytic / インスリン / ミトコンドリア / Ca感知受容体 / CaSR / インスリン分泌 / インクレチン分泌
Outline of Final Research Achievements

Human active mutant CaSR knock-in mice (ADH-KI) showed abnormal glucose tolerance with decreased insulin secretion, but the insulin content per islet and the number of islets were not different from those of wild-type mice, suggesting that the mechanism of decreased insulin secretion due to constant activation of CaSR signaling was not a decrease in pancreatic beta cell volume, but a decrease in insulin secretion. ADH-KI was administered with an inhibitor of CaSR, which had trend of improving glucose tolerance, suggesting that CaSR may be a novel target for drug therapy for diabetes.

Academic Significance and Societal Importance of the Research Achievements

既報では活性型変異CaSRによる耐糖能異常は膵β細胞量の減少によるとされていたが、本研究では新たな機序として膵β細胞のインスリン分泌機構の異常を見出した。CaSR阻害薬の投与によりインスリン分泌の改善が認められたことから、CaSRが糖尿病の治療標的となりうることを見出した。CaSRを標的とした糖尿病治療は類を見ず、画期的と考えられる。今後、膵β細胞選択的なヒト活性型変異CaSRノックインマウスを作出するなどしてさらに機序の解明を進め、CaSRを新たな治療標的として確立していく。

Report

(5 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report

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Published: 2018-04-23   Modified: 2023-01-30  

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