Recombinant Irisin Protects Against Alveolar Bone Destruction During Orthodontic Tooth Movement.

Patients with periodontitis have higher risk of alveolar bone loss when seek for orthodontic therapy. Inflammation and osteogenesis are key factors in alveolar bone destruction in periodontitis and orthodontic tooth movement (OTM). Here we evaluated the effects of irisin on alveolar bone destruction in rats with periodontitis and OTM. We isolated and cultured human periodontal ligament stem cells (PDLSCs). Irisin was administrated to PDLSCs. Cell proliferations, osteogenic differentiation, expression of RUNX2 and ALP, and the expression of OPG and RANKL were measured. We induced periodontitis and OTM in rats and treated rats with irisin. The alveolar bone loss, inflammatory cytokine levels, and expression of OPG and RANKL in gingival tissues were measured. Irisin promoted the cell proliferation and osteogenic differentiation of PDLSCs. Irisin elevated the expression of RUNX2, ALP, and OPG while decreased the expression of RANKL in PDLSCs. Irisin ameliorated the alveolar bone loss, suppressed cytokine levels, and increased OPG/RANKL expression ratio in rat with periodontitis and orthodontic tooth movement. Irisin prevented alveolar bone destruction during OTM in rats with periodontitis.