雌激素受体β基因沉默对成骨样MG63细胞骨保护素和RANKL表达的影响

背景：目前对雌激素B受体基因如何参与骨代谢的研究较少。目的：研究雌激素受体β对人成骨样细胞骨保护素、核因子kB受体活化因子配体（receptor activator of NF-κB ligand，RANKL）表达的影响。方法：将先前含有最有效干扰序列及非特异性shRNA的反转录病毒分别感染人成骨样MG63细胞株后，筛选稳定克隆并扩大培养，以空白及非特异性shRNA作为对照，检测稳定抑制雌激素受体β的效率。分别向3组细胞即MG63细胞、雌激素受体βshRNA反转录病毒感染的MG63细胞、阴性对照shRNAnc反转录病毒感染的MG63细胞加入17β-雌二醇（E2）干预，检测人成骨样细胞株MG63的骨保护素、RANKLmRNA和蛋白表达隋况。结果与结论：用pRNAT-H1．4／Retro-雌激素受体β-shRNA3进一步稳转人成骨样MG63细胞株，与空白及阴性病毒对照组相比，筛选出雌激素受体β表达稳定抑制的人成骨样细胞株，雌激素受体βmRNA抑制率为（88．17±1．17）％（P〈0．05），蛋白抑制率为（89．01±1．22）％（P〈0．05），证实实验成功建立了人成骨样细胞ERβ亚型基因敲低细胞模型。雌激素干预48h后，显示雌激素受体β稳定抑制的MG63细胞较空白组及阴性对照组骨保护素mRNA及蛋白表达上调（P〈0．05），RANKLmRNA和蛋白表达下调（P〈0．05），骨保护素RANKL表达上调（P〈0．05），提示雌激素受体β可能通过调节骨保护素／RANKL在骨代谢中发挥作用。

Silenced estrogen receptor beta affects the expressions of osteoprotegerin and receptor activator of nuclear factor-kappa B ligand in osteoblastic MG63 cells

BACKGROUND： Studies concerning how estrogen receptor β participates in bone metabolism are few now. OBJECTIVE： To investigate the effect of estrogen receptor β on the expression of osteoprotegerin and receptor activator of nuclear factor-KB ligand in human osteblast-like cells. METHODS： The retrovirus with the most effective interference sequence and non-specific short hairpin RNA was used to transfect human osteoblast-like cell MG63 in order to screen out the stable colon, and then amplified and cultured. The blank control and non-specific short hairpin RNA were used as control, and the stable inhibition rate of estrogen receptor β was detected. The 17β-estradiol was added into the cells in three groups, that were MG63 cells, short hairpin RNA retrovirus estrogen receptor β-mediated MG63 cells and negative control short hairpin RNA retrovirus-medicated MG63 cells, in order to detect the expressions of osteopretegerin and receptor activator of nuclear factor-KB ligand mRNA in human osteoblast-like cells. RESULTS AND CONCLUSION： The human osteoblast-like MG63 cell line was further stably transfected with pRNAT-H 1.4/Retre-estrogen receptor β short hairpin RNA3, and then compared with the blank control andnegative control, and found that estrogen receptor B could express the stable inhibited human osteoblast-like ceil-line The inhibition rate of estrogen receptor β mRNA was （88.17±1.17）% （P 〈 0.05）, and the inhibition rate of estrogen receptor β protein was （89.01±1.22）% （P 〈 0.05）, indicating that estrogen receptor 13 gene knockdown human osteoblast-like cell models were constructed successfully. After estrogen intervention for 48 hours, the inhibition of MG63 cells with estrogen receptor β could up-regulate the osteoprotegerin mRNA and protein expression in the blank control group and the negative control group （P 〈 0.05）, down-regulate the receptor activator of nuclear factor-KB ligand mRNA and protein expression （P 〈 0.05）, and up-regulate the osteoprotegerin receptor activator of nuclear factor-κB ligand expression. The results indicate that estrogen receptor β may play an important role in bone metabolism through regulating osteoprotegerin/receptor activator of nuclear factor-KB ligand ratio.