SR-31747 blocks cell proliferation by inhibiting sterol isomerase. SR-31747 is a sigma ligand. It has immunosuppressive and anti-inflammatory properties.

SR-31747 (10 nM) blocks the proliferation of lymphocytes at a concentration. SR-31747 arrests proliferation in yeast cells in a dose-dependent manner. SR-31747 is capable of inhibiting T-cell proliferation when added as late as 24 h after activation [2].

SR-31747 dramatically blocks lipopolysaccharide-induced production of IL-1, IL-6, and TNF-α in a dose-dependent manner (ED50: 2 mg/kg) in vivo. SR-31747 probably abrogated monokine production through an indirect mechanism that involves endogenous corticosteroids. Ablation of corticosteroids by the use of Mifepristone or adrenalectomy suppresses the effect of SR-31747. Administration of SR-31747 induces an enhancement of the corticosterone level. SR-31747 improves the survival of animals with endotoxic shock as a result of monokine inhibition [1].