Cited by 81Pancreatic function and diabetesDiabetes Treatment and ManagementIon Channels and Receptors

Potentiation of Glucose-stimulated Insulin Secretion by the GPR40–PLC–TRPC Pathway in Pancreatic β-Cells

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Yamada, Hodaka, Yoshida, Masashi, Ito, Kiyonori, Dezaki, Katsuya, Yada, Toshihiko, Ishikawa, San-e, Kakei, Masafumi·2016·Scientific Reports

Abstract

G protein-coupled receptors (GPCRs) are expressed in pancreatic beta-cells. G protein-coupled receptor 40 (GPR40) contributes to medium- or long-chain fatty acid-induced amplification of glucose-stimulated insulin secretion (GSIS) and GPR40 agonists are promising therapeutic targets in type 2 diabetes. Recently, we demonstrated that glucagon-like peptide 1, a ligand of pancreatic GPCR, activates a class of nonselective cation channels (NSCCs) and enhances GSIS. The aim of the current study was to determine whether the GPR40 signal interacts with NSCCs. A GPR40 agonist (fasiglifam) potentiated GSIS at 8.3 and 16.7 mM glucose but not 2.8 mM glucose. The NSCC current was activated by fasiglifam at 5.6 mM glucose with 100 μM tolbutamide (−70 mV) and this activation was prevented by the presence of pyrazole-3 (transient receptor potential canonical; a TRPC3 channel blocker). Inhibitors of phospholipase C or protein kinase C (PKC) inhibited the increases in GSIS and the NSCC current induced by GPR40 stimulation. The present study demonstrates a novel mechanism for the regulation of insulin secretion by GPR40 agonist in pancreatic beta-cells. The stimulation of the GPR40–PLC/PKC–TRPC3 channel pathway potentiates GSIS by the depolarization of the plasma membrane in pancreatic beta-cell.

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  • The GPR40 agonist fasiglifam activates a small inward current in the presence of glucose and tolbutamide (~1 pA/pF at -70 mV).

    “More recently, the GPR40 agonist fasiglifam was shown to activate a small inward current in the presence of glucose and tolbutamide (~1 pA/pF at -70 mV) (743).”

    From Pancreatic β-Cell Electrical Activity and Insulin Secretion: Of Mice and Men (2018) · cites this paper as [743]

    The Results section (‘Fasiglifam, a GPR40 agonist…’; Fig. 1a,b) reports that fasiglifam increased an inward current in beta-cells held at −70 mV with 5.6 mM glucose and tolbutamide present. The passages in our copy do not give the claimed magnitude of approximately 1 pA/pF, so that numerical detail is unverified. (LLM, conf=0.86)

    Experimental — accuracy not yet measured
  • Fasiglifam activation of the inward current is associated with ~15 mV depolarization and moderate stimulation of insulin secretion at both 8.3 and 16.7 mM glucose.

    “This was associated with an ~15 mV depolarization and a moderate stimulation of insulin secretion at both 8.3 and 16.7 mM glucose.”
  • The stimulatory effect of fasiglifam can be antagonized by the TRPC3 channel-specific blocker pyrazole-3.

    “The stimulatory effect of the fasiglifam could be antagonized by the TRPC3 channel-specific blocker pyrazole-3 (743).”

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Authors
Yamada, H., Yoshida, M., Ito, K., Dezaki, K., Yada, T., Ishikawa, S.-E., & Kakei, M.
Affiliations
  • Jichi Medical University Saitama Medical Center (JP)
  • Jichi Medical University (JP)
Corresponding author
Kakei, Masafumi
Venue
Scientific Reports
Published
2016-05-16
Volume
6
Issue
1
Pages
25912-25912
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2397497372
Cited by
81
References
34
Citations by year
2026: 5 · 2025: 6 · 2024: 9 · 2023: 2 · 2022: 4 · 2021: 15 · 2020: 6 · 2019: 10 · 2018: 8 · 2017: 12 · 2016: 4
FWCI
12.54
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • Jichi Medical University
  • Japan Society for the Promotion of Science (16K19545, 15K09397, 15K09396, 26670453, 26870532)
Topics
  • Health Sciences › Medicine › Surgery › Pancreatic function and diabetes
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Diabetes Treatment and Management
  • Life Sciences › Neuroscience › Sensory Systems › Ion Channels and Receptors
Keywords
GPR40, glucose-stimulated insulin secretion, pancreatic beta cells, phospholipase C, protein kinase C, TRPC3 channels, non-selective cation channels, glucagon-like peptide-1, type 2 diabetes, membrane depolarization, fatty acid signaling
MeSH terms
Insulin Secretion, Animals, Benzofurans, Drug Synergism, Glucose, Insulin, Male, Type C Phospholipases, Sulfones, Tolbutamide, Signal Transduction, Receptors, G-Protein-Coupled, TRPC Cation Channels, Insulin-Secreting Cells, Rats

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