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Endocrinol."],"abstract":"<jats:p>Gamma aminobutyric acid (GABA) is a non-proteinogenic amino acid and neurotransmitter that is produced in the islet at levels as high as in the brain. GABA is synthesized by the enzyme glutamic acid decarboxylase (GAD), of which the 65 kDa isoform (GAD65) is a major autoantigen in type 1 diabetes. Originally described to be released <jats:italic>via<\/jats:italic> synaptic-like microvesicles or from insulin secretory vesicles, beta cells are now understood to release substantial quantities of GABA directly from the cytosol <jats:italic>via<\/jats:italic> volume-regulated anion channels (VRAC). Once released, GABA influences the activity of multiple islet cell types through ionotropic GABA<jats:sub>A<\/jats:sub> receptors and metabotropic GABA<jats:sub>B<\/jats:sub> receptors. GABA also interfaces with cellular metabolism and ATP production <jats:italic>via<\/jats:italic> the GABA shunt pathway. Beta cells become depleted of GABA in type 1 diabetes (in remaining beta cells) and type 2 diabetes, suggesting that loss or reduction of islet GABA correlates with diabetes pathogenesis and may contribute to dysfunction of alpha, beta, and delta cells in diabetic individuals. While the function of GABA in the nervous system is well-understood, the description of the islet GABA system is clouded by differing reports describing multiple secretion pathways and effector functions. This review will discuss and attempt to unify the major experimental results from over 40 years of literature characterizing the role of GABA in the islet.<\/jats:p>","DOI":"10.3389\/fendo.2022.972115","type":"journal-article","created":{"date-parts":[[2022,9,29]],"date-time":"2022-09-29T14:12:57Z","timestamp":1664460777000},"update-policy":"https:\/\/doi.org\/10.3389\/crossmark-policy","source":"Crossref","is-referenced-by-count":69,"title":["The role of GABA in islet function"],"prefix":"10.3389","volume":"13","author":[{"given":"D. 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