Yes‐associated protein promotes tumour necrosis factor α–treated cementoblast mineralization partly by inactivating NF‐κB pathway

Cementum regeneration, as one of the most difficult challenges of periodontal regeneration, is influenced by inflammatory factors. Inflammation may hamper or promote periodontal tissue repair under different circumstances, as it is found to do in dentin‐pulp complex and bone tissue. Our team demonstrated that YAP promotes mineralization of OCCM, a cementoblast cell line. However, the effect of YAP on its mineralization under inflammatory microenvironment is unclear. In this study, cementogenesis in vitro was up‐regulated after transient TNF‐α treatment for 30 minutes. YAP expression also was increased by TNF‐α treatment. YAP overexpression promoted OCCM mineralization after the cells were transiently treated with TNF‐α because YAP overexpression inhibited NF‐κB pathway activity, while YAP knockdown elevated it. The inhibited mineralization potential and activated NF‐κB pathway activity by YAP knockdown also were partly rescued by the application of the NF‐κB inhibitor Bay 11‐7082. These results demonstrated that YAP plays a positive role in the mineralization of TNF‐α transiently treated cementoblast, partly by inhibiting the NF‐κB pathway activity.