Simvastatin Promotes Osteogenic Differentiation of Bone Marrow Mesenchymal Stem Cells by Regulating the BMP-2/ Smads Signaling Pathway

Objectives: This study aimed to investigate whether simvastatin could promote the osteogenic differentiation of Bone Marrow Mesenchymal Stem Cells (BMSCs) by modulating the BMP-2/ Smads signaling pathway and to elucidate its underlying mechanisms. Materials and Methods: Rat BMSCs were cultured in vitro and divided into five groups. The control group received no simvastatin intervention, while the other four groups were treated with different concentrations of simvastatin (0.00005 μg/mL, 0.0005 μg/mL, 0.005 μg/mL, and 0.05 μg/mL). Alkaline Phosphatase (ALP) staining and alizarin red staining were used to observe the morphological changes in each group of BMSCs. Western blotting was employed to detect the expression levels of BMP-2/Smads signaling pathway-related proteins BMP2, Smad2, and Smad3 in each group of BMSCs. Results: Compared to the control group, the expression of ALP and the formation of calcified nodules in BMSCs treated with simvastatin were significantly increased, indicating that simvastatin can promote the osteogenesis and differentiation of BMSCs. Moreover, as the concentration of simvastatin increased in the four experimental groups, the concentration of ALP and the number and size of calcified nodules significantly increased, suggesting that higher concentrations of simvastatin are more conducive to the osteogenesis and differentiation of BMSCs. Additionally, the Western blot results showed that the expression of BMP2, Smad2, and Smad3 in BMSCs of the experimental groups was significantly higher than that in the control group, and the expression level of these proteins increased with the concentration of simvastatin. This suggests that simvastatin may promote the osteogenesis and differentiation of BMSCs by regulating the BMP-2/Smads signaling pathway. Conclusion: This study suggests that simvastatin can promote the differentiation of rat BMSCs into osteoblast-like cells, and its mechanism of action may be related to the upregulation of the expression levels of related protein factors in the BMP-2/Smads signaling pathway.