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Recent in vitro and in vivo animal studies have reported that statin, a cholesterol-lowering drug, stimulate osteogenic differentiation. In the present study, we investigated the effect of simvastatin on osteogenic and adipogenic differentiation in primarily cultured human adipose-derived stem cells (hADSCs). The simvastatin treatment significantly increased the positive cell numbers in alkaline phosphatase and von Kossa staining, and enhanced the expression levels of bone morphogenic protein (BMP)-2, core binding factor alpha 1 (cbfa1), collgen type I and osteonectin mRNAs. Lastly, hADSCs were cultured in the adipo-genic media with or without simvastatin to examine the effect of simvastatin on adipogenic differentiation. In the RT-PCR analysis, there were notable decreases in mRNA expression of aP1, C/EBP-α and PPAR-γ in hADSCs cultivated in simvastatin-added medium, compared to those in simvastatin-free medium. It suggests that the adipogenic differentiation was significantly inhibited by simvastatin treatment. These observations indicate that simvastatin induces osteogenic differentiation and suppresses adipogenic differentiation in hADSCs.Keywords: Simvastatin, Human adipose-derived stem cells, Osteogenic differentiation, Adipogenic differ-entiation

Simvastatin Induces Osteogenic Differentiation and Suppresses Adipogenic Differentiation in Primarily Cultured Human Adipose-Derived Stem Cells