Vercirnon (GSK1605786A, CCX282-B) is a potent, selective, orally bioavailable antagonist of CCR9, inhibits CCR9-mediated Ca2+ mobilization and chemotaxis on Molt-4 cells with IC50 of 5.4 and 3.4 nM, respectively.Vercirnon (GSK1605786A, CCX282-B) displays high selectivity for CCR9 over CCR1-12 and CX3CR1-7 (IC50>10 uM).Vercirnon (GSK1605786A, CCX282-B) is an equipotent inhibitor of CCL25-directed chemotaxis of both splice forms of CCR9 (CCR9A and CCR9B) with IC50 values of 2.8 and 2.6 nM, respectively.CCX282-B also inhibited mouse and rat CCR9-mediated chemotaxis.Inhibition of CCR9 with CCX282-B results in normalization of Crohn's disease such as histopathology associated with the TNF(ΔARE) mice.
