RVX-297 is a potent, orally active BET bromodomain inhibitor with selectivity for BD2. RVX-297 shows IC50s of 0.08, 0.05, and 0.02 μM for BRD2(BD2), BRD3(BD2), and BRD4(BD2), respectively. RVX-297 suppresses inflammatory gene expression in multiple immune cell types. RVX-297 is effective in acute inflammation and autoimmunity models[1][2].

RVX-297 (1-30 μM; 24 hours) decreases proinflammatory gene expression in synovial fibroblasts[1].RVX-297 displaces BET proteins from the promoters of sensitive genes and disrupted recruitment of active RNA polymerase II, a property shared with pan-BET inhibitors that nonselectively bind BET BDs[1]. RVX-297 reduces gene expression of inflammatory mediators in vitro. RVX-297 suppresses IL-6 gene induction in human U937 macrophages, mouse primary B cells isolated from the spleen, mouse BMDMs, and THP-1 monocytes in a dose-dependent manner. RVX-297 represses IL-1β expression in LPS-stimulated mouse BMDMs, with an IC50 of 0.4-3 μM. RVX-297 inhibits MCP-1 expression in unstimulated human PBMCs with an IC50 of 0.4 μM. RVX-297 inhibits antigen stimulation of T cells and the induction of IL-17 expression[1].

RVX-297 (25-75 mg/kg; p.o.; per day for 6 day) inhibits progression of pathology in the rat collagen-induced arthritis model[1].RVX-297 (75-150 mg/kg) inhibits progression of pathology in the mouse collagen-induced arthritis model[1].RVX-297 suppresses cytokine production in LPS-treated mice[1].

[1]. Jahagirdar R, et al. RVX-297, a BET Bromodomain Inhibitor, Has Therapeutic Effects in Preclinical Models of Acute Inflammation and Autoimmune Disease. Mol Pharmacol. 2017;92(6):694-706.
[2]. Kharenko OA, et al. RVX-297- a novel BD2 selective inhibitor of BET bromodomains. Biochem Biophys Res Commun. 2016;477(1):62-67.