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Mechanosignaling activation of TGF? maintains intervertebral disc homeostasis #MMPMID28392965
Bian Q; Ma L; Jain A; Crane JL; Kebaish K; Wan M; Zhang Z; Edward Guo X; Sponseller PD; Séguin CA; Riley LH; Wang Y; Cao X
Bone Res 2017[]; 5 (ä): 17008- PMID28392965show ga
Intervertebral disc (IVD) degeneration is the leading cause of disability with no disease-modifying treatment. IVD degeneration is associated with instable mechanical loading in the spine, but little is known about how mechanical stress regulates nucleus notochordal (NC) cells to maintain IVD homeostasis. Here we report that mechanical stress can result in excessive integrin ?v?6-mediated activation of transforming growth factor beta (TGF?), decreased NC cell vacuoles, and increased matrix proteoglycan production, and results in degenerative disc disease (DDD). Knockout of TGF? type II receptor (T?RII) or integrin ?v in the NC cells inhibited functional activity of postnatal NC cells and also resulted in DDD under mechanical loading. Administration of RGD peptide, TGF?, and ?v?6-neutralizing antibodies attenuated IVD degeneration. Thus, integrin-mediated activation of TGF? plays a critical role in mechanical signaling transduction to regulate IVD cell function and homeostasis. Manipulation of this signaling pathway may be a potential therapeutic target to modify DDD.