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• W2042437520 abstract "In view of our previous data, showing that ghrelin and nitric oxide (NO) display apparently parallel effects on insulin secretion (inhibitory) and glucagon secretion (stimulatory), we have now investigated the effect of ghrelin on islet hormone secretion in relation to its effect on NO synthase (NOS) isoenzymes in isolated rat pancreatic islets. Dose-response studies revealed that ghrelin at concentrations of 0.01-1 micromol l-1 inhibited insulin secretion stimulated by 8.3 mmol l-1 glucose, while ghrelin at concentrations lower than the physiological range (0.01 pmol l-1 to 1 nmol l-1) were without effect. In contrast, glucagon secretion was stimulated by 1.0 nmol l-1 to 1 micromol l-1 ghrelin. These effects of ghrelin on insulin and glucagon secretion were accompanied by increased NO production through activation of neuronal constitutive NOS (ncNOS). Ghrelin had no appreciable effect on the activity of inducible NOS (iNOS) in the islets. Addition of an NO scavenger (cPTIO) or the NOS inhibitor L-NAME to the incubation medium prevented the effects of ghrelin on hormone secretion from isolated islets. The present results confirm our previous data showing that ghrelin inhibits insulin and stimulates glucagon secretion from pancreatic islets of the mouse and we now show similar effects in rat islets. The effects of ghrelin were accompanied by an increased rate of NO production. Conceivably, ncNOS activation partly accounts for to the inhibitory effect of ghrelin on insulin secretion and the stimulatory effect of ghrelin on glucagon secretion." @default.
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• W2042437520 date "2005-05-01" @default.
• W2042437520 modified "2023-10-12" @default.
• W2042437520 title "Ghrelin activates neuronal constitutive nitric oxide synthase in pancreatic islet cells while inhibiting insulin release and stimulating glucagon release" @default.
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• W2042437520 doi "https://doi.org/10.1016/j.regpep.2004.12.018" @default.
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