不同龄小鼠成骨细胞OPG和RANKL表达的变化

Different expressing levels of osteoprotegerin and receptor activator of nuclear factor-κB ligand from osteoblasts of young, adult and aged mice

目的观察来源于不同龄小鼠成骨细胞经雌激素作用后,分泌骨保护素(osteoprotegerin,OPG)、核因子资B受体(receptoractivatorofnuclearfactor-κBligand,RANKL)的变化。方法经雌激素作用前后,反转录-聚合酶链反应(RT-PCR)以及酶联免疫吸附试验(ELISA)测定OPG、RANKL表达的变化。结果经雌激素作用后,幼年组和成年组OPG分泌显著增多,而老年组RANKL表达明显下调。结论雌激素可以刺激成骨细胞分泌OPG,减少RANKL表达,很可能是骨质疏松的发生机制之一,是绝经后骨质疏松发生的重要原因。

Objective To investigate different expressing of OPG and RANKL expression from osteoblasts stimulated with estrogen of young, adult and aged mice changing with age. Method We employed RT-PCR and ELISA methods to measure the OPG/RANKL expression from osteoblasts before and after co-cultured with 17β-estradiol. Results OPG expressing from osteoblasts of the yound and adult mice was significantly increased after stimulated with estrogen, however, RANKL expressing wasn′t decreased significantly, compared to from osteoblasts of the aged. There were no significantly difference among osteoblasts co-cultured with methyl-piperidino-pyrazile (MPP). Conclusion Our results suggest that estrogen may exert its anti-resorptive effects on bone, at least in part, by increasing OPG and decreasing RANKL expression in osteoblasts. Decreased OPG and increased RANKL may be one of important reeasons of postmenopausal osteoporosis.