LEPTIN SUPPRESSES BASAL INSULIN-SECRETION FROM RAT PANCREATIC-ISLETS

The effects of leptin on insulin secretion from pancreatic islets of S prague-Dawley rats were examined in vitro. In a basal glucose medium ( 5.5 mM), insulin secretion from isolated islets was significantly decr eased after addition of a recombinant leptin (80 nM) (3.20 +/- 0.14 nm ol/10 islets/h) compared with that before the addition (4.41 +/- 0.30 nmol/10 islets/h). Although significant leptin suppression of insulin secretion was not observed under a glucose-stimulated (11.1 mM) condit ion, these results suggest that a negative feedback system may exist b etween leptin and insulin, which increases the production of leptin fr om adipose tissues. (C) 1997 Elsevier Science B.V.