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• W1980224304 abstract "The insulin secreting B cell is fitted with the two types of purinergic receptors: P2 (for ATP and/or ADP) and P1 (for adenosine). The activation of P2 purinoceptors by ATP or ADP evokes a biphasic stimulation of insulin secretion from isolated perfused rat pancreas; this stimulation is dose-dependent between 10(-6) and 10(-4) M. Non hydrolysable structural analogues are also effective, and the relative potency of various agonists (2-methylthio ATP >> ATP = ADP = alpha, beta-methylene ATP >> AMP) gave evidence for a P2y purinoceptor subtype. Proposed mechanisms include both an increased Ca2+ uptake and an increased intracellular Ca2+ mobilization via the hydrolysis of polyphosphoinositides. ATP (or ADP) potentiates physiological insulin-secreting agents (glucose and acetylcholine) and P2 purinoceptors could play a physiological role in the stimulation of insulin secretion. The activation of P1 purinoceptors (adenosine receptors) decreases insulin secretion. Using structural analogues of adenosine, the receptor was characterized as an A1 subtype; it is coupled to a pertussis toxin sensitive G protein and it inhibits adenylate cyclase. It is of physiological relevance that the B cell has the two types of purinoceptors with opposite effects. Recently, a metabolically stable structural analogue of ADP, adenosine-5'-0-(2-thiodiphosphate) or ADP beta S, has been described as a potent secretory agent, effective at nanomolar concentrations on isolated perfused rat pancreas. In vivo, this substance is able to increase insulin secretion and to improve glucose tolerance after IV administration in rats and oral administration in dogs. Furthermore in streptozotocin-induced diabetes. ADP beta S retains its insulin secreting effects. These results suggest that P2y purinoceptors could be a new target for antidiabetic drugs." @default.
• W1980224304 created "2016-06-24" @default.
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• W1980224304 date "1994-03-04" @default.
• W1980224304 modified "2023-10-18" @default.
• W1980224304 title "Purinergic receptors on insulin-secreting cells" @default.
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• W1980224304 doi "https://doi.org/10.1111/j.1472-8206.1994.tb00788.x" @default.
• W1980224304 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/8020870" @default.
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