Background:

GW274150 is a novel arginine-competitive, NADPH-dependent iNOS inhibitor that has been identified from a series of acetamide amino acids that have a high selectivity for iNOS vs both eNOS (>260-fold) and nNOS (>219-fold) and high bioavailability (>90%) after oral administration.Target: iNOSin vivo: GW274150 demonstrates a narrow neuroprotective therapeutic window against the toxic actions of 6-OHDA. GW274150 administration leads to a dose-dependent decrease in the number of iNOS-positive cells in the SNc of the 6-OHDA-lesioned animals. The iNOS inhibitor GW274150 fails to produce long-term neuroprotection after its withdrawal in the 6-OHDA-lesioned rat. [1]

[1]. Broom L, et al. Neuroprotection by the selective iNOS inhibitor GW274150 in a model of Parkinson disease. Free Radic Biol Med. 2011 Mar 1;50(5):633-40. [2]. Seymour M, et al. Ultrasonographic measures of synovitis in an early phase clinical trial: a double-blind, randomised, placebo and comparator controlled phase IIa trial of GW274150 (a selective inducible nitric oxide synthase inhibitor) in rheumatoid arthritis. Clin Exp Rheumatol. 2012 Mar-Apr;30(2):254-61.