| Literature DB >> 24900623 |
Fabrizio Giordanetto1, Jefferson D Revell2, Laurent Knerr1, Marie Hostettler3, Amalia Paunovic4, Claire Priest5, Annika Janefeldt1, Adrian Gill1.
Abstract
Agonists of vasoactive intestinal peptide receptor 2 (VPAC2) stimulate glucose-dependent insulin secretion, making them attractive candidates for the treatment of hyperglycaemia and type-II diabetes. Vasoactive intestinal peptide (VIP) is an endogenous peptide hormone that potently agonizes VPAC2. However, VIP has a short serum half-life and poor pharmacokinetics in vivo and is susceptible to proteolytic degradation, making its development as a therapeutic agent challenging. Here, we investigated two peptide cyclization strategies, lactamisation and olefin-metathesis stapling, and their effects on VPAC2 agonism, peptide secondary structure, protease stability, and cell membrane permeability. VIP analogues showing significantly enhanced VPAC2 agonist potency, glucose-dependent insulin secretion activity, and increased helical content were discovered; however, neither cyclization strategy appeared to effect proteolytic stability or cell permeability of the resulting peptides.Entities:
Keywords: VIP; VPAC; glucose tolerance; insulin secretion; lactamized peptide; peptide agonist; ring-closing metathesis; stapled peptide; vasoactive intestinal peptide
Year: 2013 PMID: 24900623 PMCID: PMC4027235 DOI: 10.1021/ml400257h
Source DB: PubMed Journal: ACS Med Chem Lett ISSN: 1948-5875 Impact factor: 4.345