RESUMEN
Aim To study the regulatory effect of daidzein on osteoprotegerin (OPG) and receptor activator of nuclear factor-κB ligand (RANKL) expression in MG-63 cells and its mechanism. Methods RT-PCR, Western blot and siRNA were used to study the regulatory effect of daidzein on OPG and RANKL expression in human osteoblast-like MG-63 cells. Results Daidzein could promote the expression of OPG mRNA and protein in MG-63 cells and inhibit the expression of RANKL mRNA and protein, which could be blocked by ICI 182780. It was confirmed that ERa and ER0 mediated not only the promoting effect of daidzein on OPG expression of MG-63 cells but also the inhibition of RANKL. Conclusions Daidzein promotes OPG gene expression in MG-63 cells and inhibits the expression of RANK gene expression through ERa and ERβ pathways.