New chimeric analogues of galanin: Synthesis and effects on the glucose-induced insulin secretion

Abstract

SummaryThe solid-phase synthesis and in vitro assays on the glucose-induced insulin secretion from rat pancreatic islets of Langerhans with six new chimeric peptides were performed. All the peptides were built up of the N-terminal galanin (GAL) fragment or its analogues, linked to the C-terminal portion of substance P (SP) analogues or scyliorhinin I (SCY-I) analogues. Two strong antagonists of the inhibitory effect of galanin on the glucose-induced insulin release were found: [cycloleucine4]GAL(1-13)-SP(5-11)-amide and GAL(1-13)-[L-norleucinel~ 10)-amide.