Update publication information. MSCs were lysed in cell lysis buffer for Western blotting and IP (Beyotime, Cat. No. P0013). A Dynabeads™ protein G immunoprecipitation kit (Invitrogen, Cat. No. 10007D) was used for Co-IP according to the manufacturer’s instructions. Dynabeads were resuspended and placed on a magnet to remove the supernatant then incubated with Ab Binding & Washing Buffer containing an anti-BRD4 antibody for 10 min at room temperature with rotation. The supernatant was removed by placing tubes on a magnet, and the Dynabeads-antibody complex was washed with Ab Binding & Washing Buffer. MSC lysates were added to the Dynabeads-antibody mixture and incubated for 10 min at room temperature with rotation. The supernatant was removed, the Dynabeads-antibody complex mixture was washed with washing buffer, and the proteins were separated using a standard SDS–PAGE system.