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The objective of this study was to investigate the odontoblastic differentiation of dental pulp stem cells (DPSC) by biodegradable hydrogels incorporating simvastatin micelles, both in vitro and in vivo. Simvastatin (ST) was incorporated into the micelles of gelatin grafted with L-lactic acid oligomers (LAo) to allow water-solubilization. The simvastatin-LAo-grafted gelatin (LAo-g-gelatin) micelles were mixed with gelatin, followed by chemical crosslinking to form gelatin hydrogels (ST Mi/GH). The ST Mi were released from the gelatin hydrogel granules (GH) through enzymatic degradation. The ST Mi enhanced alkaline phosphatase activity, calcium deposition, and bone morphogenic protein-2 secretion of DPSC. When implanted subcutaneously into mice, the ST Mi/GH treated group exhibited increased dentin sialoprotein and calcium deposition, compared with those treated with GH plus free ST. It is possible to achieve odontoblastic differentiation of DPSC through the controlled release of ST from GH.

Controlled release of simvastatin from biodegradable hydrogels promotes odontoblastic differentiation