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TRPC3 Regulates Islet Beta-Cell Insulin Secretion.

Gaëlle Rached1, Youakim Saliba1, Dina Maddah1

  • 1Physiology and Pathophysiology Research Laboratory, Pole of Technology and Health, Faculty of Medicine, Saint Joseph University of Beirut, POBox. 17-5208 - Mar Mikhaël, Beirut, 1104 2020, Lebanon.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|January 16, 2023
PubMed
Summary
This summary is machine-generated.

The TRPC3 channel regulates insulin release by controlling calcium levels in pancreatic beta cells, offering a new target for diabetes drug development.

Keywords:
TRPC3beta cellscalciumdiabetesinsulin

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Area of Science:

  • Endocrinology
  • Molecular Biology
  • Physiology

Background:

  • Insulin release is regulated by glucose-stimulated calcium (GSCa) via complex pathways.
  • The role of the TRPC3 cation channel in this process has been unclear.

Purpose of the Study:

  • To investigate TRPC3 as a regulator of insulin secretion and glucose control.
  • To explore TRPC3's function in glucose-stimulated insulin secretion (GSIS) and calcium signaling.

Main Methods:

  • Studied human and animal islets, Trpc3 knockout mice, and pharmacological tools.
  • Utilized fluorescent glucose analogues and calcium imaging to assess islet function.
  • Evaluated TRPC3 activation with GSK1702934A in type 2 diabetic mice.

Main Results:

  • TRPC3 is expressed in human and mouse islet beta cells and controls insulin secretion independently of KATP channels.
  • TRPC3 regulates cytosolic calcium oscillations following glucose stimulation but not glucose uptake.
  • TRPC3 inhibition or knockout impairs insulin secretion and causes glucose intolerance; activation improves diabetes hallmarks.

Conclusions:

  • TRPC3 plays a crucial role in GSIS by modulating calcium signaling.
  • TRPC3 is a promising therapeutic target for enhancing insulin secretion and treating diabetes.