– CXCR6 inhibitor 81 is a potent (EC50=40 nM) and selective orally bioavailable small molecule antagonist of human CXCR6 receptor;
Compound 81 displays >10-fold improvement in potency in both the ?-arrestin and cAMP assays (IC50 =40 and 540 nM, respectively) compared to ML339.
CXCR6 inhibitor 81 inhibits migration of SK-HEP-1 hepatoma cells in a dose dependent manner. Compound 81 has promising oral DMPK data, significantly decreases tumor growth in a 30-day mouse xenograft model of HCC.