The discovery of RPR 200765A, a p38 MAP kinase inhibitor displaying a good oral anti-arthritic efficacy
作者:Iain M. McLay、Frank Halley、John E. Souness、Jeffrey McKenna、Veronique Benning、Mark Birrell、Brenda Burton、Maria Belvisi、Alan Collis、Alex Constan、Martyn Foster、David Hele、Zaid Jayyosi、Mike Kelley、Chris Maslen、Glen Miller、Marie-Claude Ouldelhkim、Kenneth Page、Simon Phipps、Kenneth Pollock、Barry Porter、Andrew J. Ratcliffe、Elisabeth J. Redford、Stephen Webber、Bryan Slater、Veronique Thybaud、Nicola Wilsher
DOI:10.1016/s0968-0896(00)00331-x
日期:2001.2
RPR132331, a 2-(2-dioxanyl)imidazole. was identified as an inhibitor of tumour necrosis factor (TNF)alpha release from lipopolysaccharide (LPS)-stimulated human monocytes. An intensive programme of work exploring the biology, toxicity and physical chemistry of a novel series of inhibitors, derived from RPR132331, has led to the identification of RPR200765A, a development candidate for the treatment of rheumatoid arthritis (RA). RPR200765A is a potent and selective inhibitor of p38 MAP kinase (IC50 = 50 nM). It inhibits LPS-stimulated TNF alpha release both in vitro, from human monocytes (EC50 = 110 nM), and in vivo in Balb/c mice (ED50 = 6 mg/kg). At oral doses between 10 and 30 mg/kg/day it reduces the incidence and progression in the rat streptococcal cell wall (SCW) arthritis model when administered in either prophylactic or therapeutic dosing regimens. The compound, which is a mesylate salt and exists as a stable monohydrate, shows good oral bioavailabiltiy (F = 50% in the rat) and excellent chemical stability. The data from the SCW disease model suggests that RPR200765A could exhibit a profile of disease modifying activity in rheumatoid arthritis (RA) patients which is not observed with current drug therapies. (C) 2001 Elsevier Science Ltd. All rights reserved.