Therapeutic targeting of BET protein BRD4 delays murine lupus

BRD4 is a member of the BET (bromodomain and extraterminal domain) family proteins that can bind acetylated histones and influence transcription, which are considered as potential therapeutic targets in many distinct diseases. And the BET inhibitor JQ1 has been proven to be effective in suppressing multiple inflammatory and autoimmune diseases. This study aimed to examine the therapeutic potential of JQ1 on a lupus model, MRL-Ipr mice. Ten-week-old MRL-Ipr mice were treated with JQ1 (oral administration of 200 mg/kg) or vehicle for 8 weeks. The proteinuria, nephritic damage, serum biochemistry, autoantibodies and cytokines were examined. Splenocytes of MRL-Ipr mice were isolated for in vitro experiments. Treatment with JQ1 significantly attenuated the progression of proteinuria and nephritis. The serum concentrations of anti-dsDNA antibody as well as B-cell activating factor (BAFF), interleukin (IL)-1 beta, IL-6, IL-17 and INF-gamma, were inhibited, and IL-10 augmented by JQ1. Importantly, JQ1 improved the survival of lupus mice. In vitro, BAFF, IL-1 beta, IL-6, IL-17 and INF-gamma were inhibited, and IL-10 augmented by JQ1 (500 nM) in the cultures of splenocytes from diseased MRL-Ipr mice, which was further supported by a significant reduction in immune complex-mediated activation of human monocytes in vitro by JQ1. Taken together, JQ1 effectively alleviates lupus in MRL-Ipr mice by suppressing BAFF, pro-inflammatory cytokines and autoimmunity, supporting the therapeutic value JQ1 in lupus disease. (C) 2015 Elsevier B.V. All rights reserved.