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• W2110160705 abstract "Glucagon-like peptide-1 (GLP-1) is a potent regulator of glucose-stimulated insulin secretion whose mechanisms of action are only partly understood. In the present paper, we show that at low (3 mM) glucose concentrations, GLP-1 increases the free intramitochondrial concentrations of both Ca(2+) ([Ca(2+)](m)), and ATP ([ATP](m)) in clonal MIN6 beta-cells. Suggesting that cAMP-mediated release of Ca(2+) from intracellular stores is responsible for these effects, increases in [ATP](m) that were induced by GLP-1 were completely blocked by the Rp isomer of adenosine-3',5'-cyclic monophosphothioate (Rp-cAMPS), or by chelation of intracellular Ca(2+). Furthermore, inhibition of Ins(1,4,5) P (3) (IP(3)) receptors with xestospongin C, or application of ryanodine, partially inhibited GLP-1-induced [ATP](m) increases, and the simultaneous blockade of both IP(3) and ryanodine receptors (RyR) completely eliminated the rise in [ATP](m). GLP-1 appeared to prompt Ca(2+)-induced Ca(2+) release through IP(3) receptors via a protein kinase A (PKA)-mediated phosphorylation event, since ryanodine-insensitive [ATP](m) increases were abrogated with the PKA inhibitor, H89. In contrast, the effects of GLP-1 on RyR-mediated [ATP](m) increases were apparently mediated by the cAMP-regulated guanine nucleotide exchange factor cAMP-GEFII, since xestospongin C-insensitive [ATP](m) increases were blocked by a dominant-negative form of cAMP-GEFII (G114E,G422D). Taken together, these results demonstrate that GLP-1 potentiates glucose-stimulated insulin release in part via the mobilization of intracellular Ca(2+), and the stimulation of mitochondrial ATP synthesis." @default.
• W2110160705 created "2016-06-24" @default.
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• W2110160705 date "2003-01-15" @default.
• W2110160705 modified "2023-09-25" @default.
• W2110160705 title "Glucagon-like peptide-1 mobilizes intracellular Ca2+ and stimulates mitochondrial ATP synthesis in pancreatic MIN6 beta-cells" @default.
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• W2110160705 doi "https://doi.org/10.1042/bj20021288" @default.
• W2110160705 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1223096" @default.
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