2015 Fiscal Year Final Research Report
Potentiation of Glucose-Stimulated Insulin Secretion by GPR40-PLC-TRPC Pathway and cAMP-EPAC2-TRPM2 Pathway in Pancreatic Beta Cells
| Project/Area Number |
26870532
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Multi-year Fund |
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| Research Field |
Endocrinology
Metabolomics
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| Research Institution | Jichi Medical University |
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Principal Investigator |
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| Project Period (FY) |
2014-04-01 – 2016-03-31
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| Keywords | 膵β細胞 / インクレチン / ＧＰＲ４０ / ＧＬＰ－１ / Ｔｒｐｍ２ / ＴｒｐＣ３ |
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| Outline of Final Research Achievements |
It has been proposed that glucose-stimulated insulin secretion is initiated by closure of KATP channels, followed by membrane depolarization. In theory, however, closure of KATP channels is insufficient to shift the membrane potential toward a threshold level, since membrane potential is determined by the overall balance between outward and inward currents. Modest constitutional opening of background inward current through nonselective cation channels (NSCCs) is crucial to facilitate depolarization. Recently, we demonstrated that a class of NSCC is activated by both glucose metabolism and incretin hormones, via Trpm2 pathway. In this study, we demonstrate that gastric hormone ghrelin attenuates glucose-induced insulin secretion via TRPM2 pathway. We also demonstrate that GPR40 agonist stimulate insulin secretion via the TRPC3 channel pathway. We believe that TRPM2 pathway and TRPC3 pathway provide a potential therapeutic target for the treatment of type 2 diabetes.
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| Free Research Field |
インスリン分泌
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