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- W2030274310 abstract "The selective beta 2-adrenergic agonist clenbuterol was ineffective as a stimulus for insulin secretion when isolated rat pancreatic islets were incubated with glucose at concentrations between 4 and 20 mM. Inclusion of the phosphodiesterase inhibitor 3-isobutyl-1-methylxanthine led to potentiation of glucose-induced insulin secretion, but did not facilitate stimulation by clenbuterol. Furthermore, maintenance of isolated rat islets for up to 3 days in tissue culture also failed to result in the appearance of a secretory response to beta-agonists. By contrast, clenbuterol induced a dose-dependent increase in insulin release from isolated human islets incubated with 20 mM glucose. Clenbuterol did not increase the basal rate of insulin secretion (4 mM glucose) in human islets. Under perifusion conditions, the secretory response of human islets to clenbuterol was rapid, of similar magnitude to that seen under static incubation conditions and could be sustained for at least 30 min. The increase in insulin secretion induced by clenbuterol was inhibited by propranolol, indicating that the response was mediated by activation of beta-receptors. In support of this, a similar enhancement of glucose-induced insulin secretion was elicited by a different beta 2-agonist, salbutamol, in human islets. The results indicate that the B cells of isolated rat islets are unresponsive to beta-agonists, whereas those of human islets are equipped with functional beta-receptors which can directly influence the rate of insulin secretion." @default.
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- W2030274310 title "Differential effects of β-adrenergic agonists on insulin secretion from pancreatic islets isolated from rat and man" @default.
- W2030274310 doi "https://doi.org/10.1677/jme.0.0050049" @default.
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