Decreased intake of a liquid diet in nonfood-deprived rats following intra-PVN injections of GLP-1 (7-36) amide.

I.c.v. administration of glucagon-like peptide-1 (7-36) amide (GLP-1) dose dependently suppresses food intake in rats, and induces activation of c-fos within rat paraventricular hypothalamus (PVN). The present study sought to determine whether GLP-1 (7-36) amide may act within the PVN by examining the effects of intra-PVN administration of GLP-1 (7-36) amide on food intake in rats. Adult male rats (n = 11) were prepared with indwelling guide cannulae aimed at the PVN. Rats were allowed access to a palatable liquid diet (Ensure) and water during a daily 60-min test period with intakes measured every 15 min. Intra-PVN administration of GLP-1 (7-36) amide (10, 50, 100 and 200 ng) did not alter latency to feed, but did suppress liquid diet intake over a 1-h testing period, as a function of dose. These results suggest that GLP-1 (7-36) amide may act, in part, to suppress feeding through interactions with cells within the PVN.