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We investigated the therapeutic potential of taxifolin for treatment of alveolar bone loss (ABL) in experimental periodontitis in diabetic rats. Diabetes mellitus (DM) was induced by streptozotocin. Rats were divided into six groups: untreated control; DM only (D) group; ligature only (P) group; DM + ligature (DP) group; DM + ligature + 5 mg/kg/day taxifolin (Taxi-5) group; DM + ligature + 10 mg/kg/day taxifolin (Taxi-10) group. Experimental periodontitis was induced by ligation of the first molar and allowed to progress for 30 days before performing cone-beam computed tomographic (CBCT), histomorphometric and immunohistochemical analyses of periodontal tissue destruction. ABL was assessed using CBCT. ABL was greatest in the P and DP groups. Decreased ABL was observed in the Taxi-5 and Taxi-10 groups. Bone morphogenic protein (BMP-2), osteocalcin (OCN), receptor activator of nuclear factor kappa-Β ligand (RANKL), alkaline phosphatase (ALP), type I collagen, B cell lymphoma-associated X (Bax), and B-cell lymphoma 2 (Bcl-2) levels were investigated using immunohistochemistry. The Taxi-5 and Taxi-10 groups exhibited decreased RANKL expression, but increased BMP-2, ALP, type I collagen and OCN levels compared to the P and DP groups. Bax activity was increased in the D, P and DP groups. Taxi-5 and Taxi-10 groups exhibited increased Bcl-2 activity. Our findings suggest that taxifolin can reduce apoptosis and improve alveolar bone formation in diabetic rats with periodontitis.

Effects of taxifolin on bone formation and apoptosis in experimental periodontitis in diabetic rats