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The role of GABA in islet function.

D Walker Hagan1, Sandra M Ferreira1, Gustavo J Santos2

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Frontiers in Endocrinology
|October 17, 2022
PubMed
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Gamma aminobutyric acid (GABA) is a neurotransmitter found in islets, crucial for cell function. Its depletion in diabetes suggests a link to pathogenesis and cell dysfunction.

Keywords:
beta cellinsulinisletpancreasreceptorsignalingγ-Aminobutyric acid (GABA)

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Area of Science:

  • Endocrinology
  • Neuroscience
  • Metabolic Research

Background:

  • Gamma aminobutyric acid (GABA), a neurotransmitter, is synthesized in pancreatic islets at concentrations comparable to the brain.
  • Glutamic acid decarboxylase (GAD), particularly the GAD65 isoform, synthesizes GABA and is a key autoantigen in type 1 diabetes.
  • Islet GABA influences alpha, beta, and delta cell activity via GABA receptors and impacts cellular metabolism.

Purpose of the Study:

  • To review and unify the diverse experimental findings on the role of GABA in pancreatic islets.
  • To clarify secretion pathways and effector functions of GABA within the islet microenvironment.
  • To explore the correlation between GABA levels and diabetes pathogenesis.

Main Methods:

  • Literature review of over 40 years of research on islet GABA.
  • Analysis of studies investigating GABA synthesis, release, and receptor interactions in islets.
  • Examination of data linking GABA levels to diabetes and islet cell function.

Main Results:

  • Islet beta cells release GABA from the cytosol via volume-regulated anion channels (VRAC), in addition to previously described pathways.
  • GABA acts on both ionotropic (GABAA) and metabotropic (GABAB) receptors on various islet cell types.
  • Reduced GABA levels are observed in both type 1 and type 2 diabetes, correlating with disease progression.

Conclusions:

  • The islet GABA system is complex, with multiple release mechanisms and functions.
  • Loss of GABA in islets is linked to diabetes pathogenesis and contributes to islet cell dysfunction.
  • Further research is needed to fully elucidate the therapeutic potential of targeting the islet GABA system.