Statins inhibit 3-hydroxy-3-methylglutaryl-coenzyme A (HMG-CoA) reductase, which catalyzes conversion of HMG-CoA to mevalonate, a rate-limiting step in cholesterol synthesis. The present study was undertaken to understand the events of osteoblast differentiation induced by statins. Simvastatin at 10(-7) M markedly increased mRNA expression for bone morphogenetic protein-2 (BMP-2), vascular endothelial growth factor (VEGF), alkaline phosphatase, type I collagen, bone sialoprotein, and osteocalcin (OCN) in nontransformed osteoblastic cells (MC3T3-E1), while suppressing gene expression for collagenase-1, and collagenase-3. Extracellular accumulation of proteins such as VEGF, OCN, collagenase-digestive proteins, and noncollagenous proteins was increased in the cells treated with 10(-7) M simvastatin, or 10(-8) M cerivastatin. In the culture of MC3T3-E1 cells, statins stimulated mineralization; pretreating MC3T3-E1 cells with mevalonate, or geranylgeranyl pyrophosphate (a mevalonate metabolite) abolished statin-induced mineralization. Statins stimulate osteoblast differentiation in vitro, and may hold promise drugs for the treatment of osteoporosis in the future.
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