{Reference Type}: Journal Article
{Title}: OGT-induced O-GlcNAcylation of NEK7 protein aggravates osteoarthritis progression by enhancing NEK7/NLRP3 axis.
{Author}: He C;Wu Q;Zeng Z;Yang Y;He H;Hu M;Liu S;
{Journal}: Autoimmunity
{Volume}: 57
{Issue}: 1
{Year}: 2024 Dec
{Factor}: 2.957
{DOI}: 10.1080/08916934.2024.2319202
{Abstract}: <B>UNASSIGNED: </B>The role of O-GlcNAc transferase (OGT)-induced O-linked N-acetylglucosaminylation (O-GlcNAcylation) has been reported in multiple human diseases. However, its specific functions in osteoarthritis (OA) progression remain undetermined.<BR><B>UNASSIGNED: </B>This study focused on the target proteins of OGT-induced O-GlcNAcylation in OA and the specific functional mechanism.<BR><B>UNASSIGNED: </B>The levels of total O-GlcNAc and OGT were measured in both in vitro and in vivo OA models using western blot. The effects of OGT knockout on OA progression were detected through Safranin O staining, immunohistochemical staining and OARSI score evaluation. The effects of OGT silencing on LPS-induced chondrocyte injury were assessed by performing loss-of function assays. Co-immunoprecipitation (co-IP) was conducted to verify the effect of OGT-induced O-GlcNAcylation on the interaction between NEK7 and NLRP3. The role of OGT in modulating the O-GlcNAcylation and phosphorylation levels of NEK7 was analysed using western blot.<BR><B>UNASSIGNED: </B>The OGT-indued O-GlcNAcylation level was increased in both in vitro and in vivo OA models. Knockout of OGT mitigated OA progression in model mice. Additionally, silencing of OGT suppressed LPS-induced chondrocyte pyroptosis. Moreover, silencing of OGT inhibited the O-GlcNAcylation and enhanced the phosphorylation of NEK7 at S260 site, thereby blocking the binding of NEK7 with NLRP3.<BR><B>UNASSIGNED: </B>OGT-induced NEK7 O-GlcNAcylation promotes OA progression by promoting chondrocyte pyroptosis via the suppressing interaction between NEK7 and NLRP3.