Regulated exocytosis of GABA-containing synaptic-like microvesicles in pancreatic beta-cells.
We have explored whether gamma-aminobutyric acid (GABA) is released by regulated exocytosis of GABA-containing synaptic-like microvesicles (SLMVs) in insulin-releasing rat pancreatic beta-cells. To this end, beta-cells were engineered to express GABA(A)-receptor Cl(-)-channels at high density using adenoviral infection. Electron microscopy indicated that the average diameter of the SLMVs is 90 nm, that every beta-cell contains approximately 3,500 such vesicles, and that insulin-containing lar...Expand abstract
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