辛伐他汀促进骨髓基质细胞的成骨分化

目的：观察辛伐他汀对骨髓基质细胞成骨分化的影响，探讨其刺激成骨的作用机制。方法：体外培养成年小鼠骨髓基质细胞，不同浓度的辛伐他汀作用72h后，RT-PCR检测骨钙素(osteocalcin，OCN)mRNA水平的变化，Western blot检测OCN和骨桥蛋白(osteopontin，OPN)表达水平的变化，细胞碱性磷酸酶(alkaline phosphatase，ALP)细胞化学染色及酶比活性测定。结果：辛伐他汀作用72h后，OCN的mRNA表达水平增高，OCN、OPN蛋白表达水平增高，呈剂量依赖关系，细胞ALP染色增强，ALP比活性显著增高。结论：辛伐他汀促进骨髓基质细胞的成骨分化，辛伐他汀刺激成骨的作用机制可能与此有关。

Simvastatin induces osteoblastic differentiation of bone marrow stromal cells

Objective: To observe the effect of simvastatin on osteoblastic cell differentiation of bone marrow stromal cells in vitro, and to elucidate the mechanisms of anabolic effect of simvastatin on bone formation. Methods: Bone marrow stromal cells from femur and tibia of adult female BALB C mice were cultured in vitro , after being treated with different concentrations of simvastatin for 72 h, changes of mRNA level of osteocalcin (OCN) were detected by RT PCR, change of OCN, and osteopontin (OPN) expression were examined by Western blot, and the changes of cellular alkaline phosphatase activity (ALP) were examined by histochemistry and enzymologic measurement. Results: After bone marrow stromal cells were treated with different concentration of simvastatin for 72 h, level of OCN mRNA increased, and expression of OCN and OPN also increased in a concentration dependent manner, and cellular ALP activity significantly increased in a concentration dependent manner. Conclusion: Simvastatin can stimulate osteoblastic differentiation,and improve cellular ALPase activity with high expression of osteocalcin and osteopontin in vitro. These may be parts of the mechanism of anabolic effect of simvastatin on bone formation.