BRD4 and osteoarthritis: Bromodomain‐containing protein 4 inhibition in chondrocytes was reported to reverse inflammatory response in the development of osteoarthritis, but the role of BRD4 in microglia activation is still unknown.17 Lipopolysaccharide (LPS) is a well‐recognized inflammatory response inducer in microglia, thus we used it to trigger inflammatory response in HAPI microglia cells.21, 22 Based on the activation of BRD4 after the SCI described above and previous studies about the pro‐inflammation property of BRD4, we decided to investigate the effects of BRD4 inhibition on inflammatory response after SCI.