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Role of the GRP78-c-Src signaling pathway on osteoblast differentiation of periodontal ligament fibroblasts induced by cyclic mechanical stretch
Hu Jing, Cui Zhihua, Huang Keqiang, Su Rongjian, Zhao Song
PDF(3581 KB)
PDF(3581 KB)
Role of the GRP78-c-Src signaling pathway on osteoblast differentiation of periodontal ligament fibroblasts induced by cyclic mechanical stretch
), Cui Zhihua2, Huang Keqiang3, Su Rongjian4(), Zhao Song1()Objective This study aims to investigate the influence of glucose regulated protein (GRP) 78 on osteoblast differentiation in periodontal ligament fibroblasts (PDLFs) under cyclic mechanical stretch and determine the underlying mechanism. Methods FlexCell 5000 cell mechanical device was applied to simulate the stress environment of orthodontic teeth. GRP78High and GRP78Low subpopulation were obtained by flow sorting. Gene transfection was performed to knockdown GRP78 and c-Src expression and overexpress c-Src. Western blot analysis was used to detect the protein expression of Runt-related gene 2 (RUNX2), Osterix, osteocalcin (OCN), and osteopontin (OPN). Immunoprecipitation assay was used to determine the interaction of GRP78 with c-Src. The formation of cellular mineralized nodules was determined by alizarin red staining. Results GRP78 was heterogeneously expressed in PDLFs, and GRP78High and GRP78Low subpopulations were obtained by flow sorting. The osteogenic differentiation ability and phosphorylation level of c-Src kinase in the GRP78High subpopulation were significantly increased compared with those in GRP78Low subpopulation after cyclic mechanical stretch (P<0.05). GRP78 interacted with c-Src in PDLFs. The overexpression c-Src group showed significantly increased osteogenic differentiation ability than the vector group (P<0.05), and the sic-Src group showed significantly decreased osteogenic differentiation ability (P<0.05) after cyclic mechanical stretch. Conclusion GRP78 upregulates c-Src expression by interacting with c-Src kinase and promotes osteogenic differentiation under cyclic mechanical stretch in PDLFs.
cyclic mechanical stretch / osteogenic differentiation / periodontal ligament fibroblasts / glucose regulated protein 78
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