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Current Topics in Medicinal Chemistry

Editor-in-Chief

ISSN (Print): 1568-0266
ISSN (Online): 1873-4294

The Discovery of VLA-4 Antagonists

Author(s): Jefferson W. Tilley, Li Chen, Achyutharao Sidduri and Nader Fotouhi

Volume 4, Issue 14, 2004

Page: [1509 - 1523] Pages: 15

DOI: 10.2174/1568026043387502

Price: $65

Abstract

Starting with a cyclic peptide of moderate potency as a VLA-4 antagonist, highly potent and conformationally defined cyclic peptides were developed incorporating a constrained tyrosine and an achiral Asp-Pro spacer. N-Acyl phenylalanine derivatives were also discovered to have VLA-4 antagonist activity. During the course of development of this series, we found that the active acylphenylalanines mimic the pharmacophores present in the cyclic peptides and hypothesized that they bind to the same site on VLA-4. This insight guided our optimization strategy. Based on the emerging SAR, as well as insights from the recent X-ray crystal structure of the integrin αvβ3 bound to a RGD containing cyclic peptide, we propose a binding model for these compounds.

Keywords: vla-4 antagonists, vascular cell adhesion molecule, asthma, inflammatory bowel disease, vcam/vla-4 interaction, acylphenylalanines, sar


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