Orthodontic tooth movement is a process stimulated and maintained by external tensile stress; periodontal ligament remodeling serves an important role during this process. However, the function and underlying mechanism of periostin (PN) during orthodontic periodontal ligament remodeling remain unclear. The present study established in vitro and in vivo models of orthodontic treatment to investigate the expression levels of PN under conditions of external tensile stress load. These results indicated that tensile stress load increased the expression levels of PN in mouse peridontal ligaments and human periodontal ligament cells (hPDLCs), during orthodontic tooth movement. Furthermore, the present study demonstrated that the expression levels of PN were regulated by transforming grown factor β, and that PN promotes type I collagen and α‑smooth muscle actin expression levels in hPDLCs. Therefore, PN may be essential for periodontal ligament remodeling during orthodontic treatment, and therefore may represent a potential therapeutic target.
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