Effects of PYY[3-36] in rodent models of diabetes and obesity.

Background: Peptide YY (PYY) is a 36 amino-acid peptide secreted from ileal L cells following meals. The cleaved subpeptide PYY[3-36] is biologically active and may constitute the majority of circulating PYY-like immunoreactivity. The peptide family that includes PYY, pancreatic peptide and neuropeptide Y is noted for its orexigenic effect following intracerebroventricular administration.

Glucose-lowering and insulin-sensitizing actions of exendin-4: studies in obese diabetic (ob/ob, db/db) mice, diabetic fatty Zucker rats, and diabetic rhesus monkeys (Macaca mulatta).

Exendin-4 is a 39 amino acid peptide isolated from the salivary secretions of the Gila monster (Heloderma suspectum). It shows 53% sequence similarity to glucagon-like peptide (GLP)-1. Unlike GLP-1, exendin-4 has a prolonged glucose-lowering action in vivo.

Synergy between amylin and cholecystokinin for inhibition of food intake in mice.

Several gastrointestinal peptides which are secreted in response to nutrients have been reported to suppress food intake. Amylin is a peptide hormone co-secreted with insulin from pancreatic beta-cells in response to nutrient stimuli. Cholesystokinin (CCK) is secreted from duodenal and jejunal mucosal cells in response to fat and protein.