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- W2020084328 abstract "In pancreatic beta-cells, calcium is required for insulin secretion, but can also stimulate gene transcription. High potassium-induced membrane depolarization and calcium influx have previously been shown to activate kinases that phosphorylate and thereby activate the transcription factor cAMP response element (CRE-binding protein (CREB) binding to CREs. It is unknown, however, whether hormones and neurotransmitters can activate this mechanism. Arginine vasopressin (AVP), bombesin, and acetylcholine potentiate glucose-induced insulin secretion and are known to raise cytosolic calcium levels through binding to cell surface receptors that activate phospholipase C. The effect of AVP on CRE-directed transcription was examined in the beta-cell line HIT. AVP (0.1-100 nM) stimulated gene transcription after transient transfection of a reporter gene that was placed under the transcriptional control of a CRE. This effect was inhibited by a vasopressin V1 receptor antagonist and depended on calcium influx and calcineurin phosphatase activity. By immunoblots with antiphospho-CREB antibodies and by using a Gal4-CREB fusion protein, it was shown that AVP induces the phosphorylation and activation of CREB. Like AVP, bombesin (100 nM) and the muscarinic agonist carbachol (200 microM) stimulated CRE-mediated transcription. These results show that calcium-mediating insulin secretagogues can activate CREB/CRE-directed transcription in HIT cells, offering a mechanism by which these secretagogues could produce long term effects on beta-cell function, changing the pattern of gene expression." @default.
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- W2020084328 title "Calcium-mobilizing insulin secretagogues stimulate transcription that is directed by the cyclic adenosine 3',5'-monophosphate/calcium response element in a pancreatic islet beta-cell line." @default.
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- W2020084328 doi "https://doi.org/10.1210/endo.137.1.8536617" @default.
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