Abstract
This study evaluated the effects of metformin on orthodontic tooth movement in a rat model of type 2 diabetes mellitus. Rats were fed a high-fat diet for 4 weeks to induce fat accumulation and insulin resistance, and then injected with a low dose of streptozotocin (35 mg/kg) intraperitoneally to induce type 2 diabetes. An orthodontic appliance was placed in normoglycemic, type 2 diabetes, and type 2 diabetes with metformin-administrated rats. After 14 days, type 2 diabetes rats exhibited greater orthodontic tooth movement and had a higher number of tartrate-resistant acid phosphatase-positive osteoclasts, stronger cathepsin K expression, and weaker alkaline phosphatase immunostaining than normoglycemic rats. Metformin administration resulted in normalization of osteoclast numbers, cathepsin K immunostaining, and of tooth movement as well as partly recovery of alkaline phosphatase expression in diabetic rats. Metformin also reduced sclerostin expression and improved the immunolocalization of dentin matrix protein 1 in osteocytes of type 2 diabetes rats. These results suggest that metformin administration reversed the adverse effects of diabetes on orthodontic tooth movement.
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Acknowledgements
This study was partially supported by the National Nature Science Foundation of China (Nos. 81271965; 81470719; 8151101150) to Li M. The Shandong Province Science and Technique Foundation, China (No. 2014GSF118093) to Guo J.
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Sun, J., Du, J., Feng, W. et al. Histological evidence that metformin reverses the adverse effects of diabetes on orthodontic tooth movement in rats. J Mol Hist 48, 73–81 (2017). https://doi.org/10.1007/s10735-016-9707-y
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DOI: https://doi.org/10.1007/s10735-016-9707-y