title: N-Methylated cyclic RGD peptides as highly active and selective alpha(V)beta(3) integrin antagonists.
abstract: The alpha(V)beta(3) integrin receptor plays an important role in human tumor metastasis and tumor-induced angiogenesis. The in vivo inhibition of this receptor by antibodies or by cyclic peptides containing the RGD sequence may in the future be used to selectively suppress these diseases. Here we investigate the influence of N-methylation of the active and selective alpha(V)beta(3) antagonist cyclo(RGDfV) (L1) on biological activity. Cyclo(RGDf-N(Me)V-) (P5) was found to be even more active than L1 and is one of the most active and selective compounds in inhibiting vitronectin binding to the alpha(V)beta(3) integrin. Its high-resolution, three-dimensional structure in water was determined by NMR techniques, distance geometry calculations, and molecular dynamics calculations, providing more insight into the structure-activity relationship.
authors.affiliation: Institut für Organische Chemie und Biochemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany.
authors.forename: M A
authors.initials: MA
authors.lastname: Dechantsreiter
authors.forename: E
authors.initials: E
authors.lastname: Planker
authors.forename: B
authors.initials: B
authors.lastname: Mathä
authors.forename: E
authors.initials: E
authors.lastname: Lohof
authors.forename: G
authors.initials: G
authors.lastname: Hölzemann
authors.forename: A
authors.initials: A
authors.lastname: Jonczyk
authors.forename: S L
authors.initials: SL
authors.lastname: Goodman
authors.forename: H
authors.initials: H
authors.lastname: Kessler
mesh_terms: D006801:Humans; D016023:Integrins / Q000037:antagonists & inhibitors*; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy; D008745:Methylation; D008958:Models, Molecular; D008968:Molecular Conformation; D009842:Oligopeptides / Q000138:chemical synthesis* / Q000737:chemistry; D010456:Peptides, Cyclic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D012910:Snake Venoms
chemical_list: D016023:Integrins; D008024:Ligands; D009842:Oligopeptides; D010456:Peptides, Cyclic; D012910:Snake Venoms; C092113:cyclo(arginyl-glycyl-aspartyl-phenylalanyl-valyl); C422910:Cilengitide