Vicriviroc Malate

Vicriviroc is an orally available CCR5 antagonist, which binds specifically to the CCR5 receptor and prevents infection of target cells by CCR5-tropic HIV-1 isolates. Vicriviroc potently inhibited all the viral isolates tested, with geometric mean EC50s ranging between 0.04 nM and 2.3 nM and IC90s between 0.45 nM and 18 nM. Vicriviroc inhibits MIP-1α induced migration of Ba/F3 cells stably expressing recombinant human CCR5, with IC50 of 0.91 nM. Vicriviroc inhibits GTPγS binding to the membranes from HTS-hCCR5 cells induced by RANTES, with IC50 of 4.2 nM. Competition binding assays revealed that vicriviroc binds with higher affinity to CCR5 than SCH-C. Finally, vicriviroc demonstrated diminished affinity for the human ether a-go-go related gene transcript ion channel compared to SCH-C, suggesting a reduced potential for cardiac effects.