{Reference Type}: Journal Article
{Title}: IRE1α inhibits osteogenic differentiation of mouse embryonic fibroblasts by limiting Shh signaling.
{Author}: Zhang Z;Zhang X;Wei X;Yu C;Xiao L;Liu J;Liu Y;Cao Y;Song K;
{Journal}: Oral Dis
{Volume}: 0
{Issue}: 0
{Year}: 2024 Mar 4
{Factor}: 4.068
{DOI}: 10.1111/odi.14919
{Abstract}: <B>OBJECTIVE: </B>This study aimed to investigate the effect of endoplasmic reticulum (ER) stress sensor inositol-requiring enzyme 1α (IRE1α) on the sonic hedgehog N-terminus (N-Shh)-enhanced-osteogenic differentiation process in mouse embryonic fibroblasts (MEFs).<BR><B>METHODS: </B>Osteogenesis of MEFs was observed by alkaline phosphatase (ALP) staining, alizarin red staining, and Von Kossa staining assays. Activation of unfolded protein response and Shh signaling were examined using real-time quantitative PCR and western blot assays. IRE1α-deficient MEFs were used to explore the effect of IRE1α on N-Shh-driven osteogenesis.<BR><B>RESULTS: </B>N-Shh increased ALP activity, matrix mineralization, and the expression of Alp and Col-I in MEFs under osteogenic conditions; notably, this was reversed when combined with the ER stress activator Tm treatment. Interestingly, the administration of N-Shh decreased the expression of IRE1α. Abrogation of IRE1α increased the expression of Shh pathway factors in osteogenesis-induced MEFs, contributing to the osteogenic effect of N-Shh. Moreover, IRE1α-deficient MEFs exhibited elevated levels of osteogenic markers.<BR><B>CONCLUSIONS: </B>Our findings suggest that the IRE1α-mediated unfolded protein response may alleviate the ossification of MEFs by attenuating Shh signaling. Our research has identified a strategy to inhibit excessive ossification, which may have clinical significance in preventing temporomandibular joint bony ankylosis.