雌激素及雌激素受体拮抗剂ⅡCI 182780对大鼠垂体泌乳素GH3细胞Calbindin-D9k表达的影响  

Differential effects of estrogen and estrogen receptor antagonist, ⅡCI 182780 on the expression of Calbindin-D9k in rat pituitary prolactinoma GH3 cells

作　　者：王婉[1] 武云龙[2] 刘晶[2] 梁前垒[2] 赵原正 郭永川[2] 

机构地区：[1]吉林大学基础医学院免疫学系,长春130021 [2]吉林大学中日联谊医院神经外科,130033

出　　处：《中华内分泌外科杂志》2014年第3期180-184,共5页Chinese Journal of Endocrine Surgery

基　　金：吉林省自然科学基金面上项目（201115096）

摘　　要：目的 探讨17β-雌二醇（17β-estradiol,E2）对大鼠泌乳素腺瘤细胞株GH3细胞Calbindin-D9k（CaBP-9k）表达的影响,并探讨选择性雌激素受体拮抗剂ⅡCI 182780是否能够拮抗雌激素对CaBP-9k表达的诱导作用.方法 以GH3细胞作为垂体泌乳素腺瘤的体外模型,通过免疫荧光法观察CaBP-9k在GH3细胞的表达情况;E2分3个剂量：10-8、10-9、10-10 M对GH3细胞作用24h,分别以RT-PCR法及Western blot法检测CaBP-9k基因和蛋白的表达水平;E2以10-8 M的剂量对GH3细胞作用24 h,同时设ⅡCI 182780拮抗组（10-6M）,被用于研究ER介导的通路对CaBP-9k表达的影响;用免疫共沉淀法检测CaBP-9k与ERα的相互作用关系.结果 在GH3细胞中,CaBP-9k的表达水平随E2给药浓度的增高而增加.当同时给予ⅡCI 182780时,E2诱导CaBP-9k表达的作用被拮抗,其表达水平显著降低.进一步通过免疫共沉淀法证实,在GH3细胞中,CaBP-9k与ERα能够直接结合,E2能够上调2者的相互作用.结论 雌激素可能通过ERα途径诱导GH3细胞CaBP-9k的表达,且CaBP-9k与ERα能够直接结合相互作用.提示CaBP-9k可能参与GH3细胞ER途径相关的生物学效应.Objective To detect the effects of 17 β-estradiol（E2）on the expression of Calbindin-D9k （CaBP-9k） in pituitary GH3 cells,and to investigate the antagonistic effect of a selective estrogen receptor antagonist,ⅡCI 182780 on CaBP-9k expression.Methods A rat pituitary prolactinoma cell line,GH3 cell was used as the in vitro model.The localization of CaBP-9k in GH3 cells was observed by immunofluorescence.GH3 cells were cultured with exogenous E2-added medium for 24 hours,and the concentrations of E2 were 10-8,10-9,10-10M,respectively.mRNA and protein expression levels of CaBP-9k in different groups were analyzed by RT-PCR and Western blot analysis.The estrogen receptor antagonist,and ⅡCI 182780 was added to GH3 cells before E2 administration （10-8M）with the concentration of 10-6M,in order to investigate the regulation of ER-mediated pathway on the expression of CaBP-9k.Immunoprecipitation was used to detect the interaction between CaBP-9k and ERα.Results E2 had significant stimulatory effect on the CaBP-9k expression of GH3 cells in a dose dependent manner,and the expression level of CaBP-9k was higher when treated with a higher concentration of E2.ⅡCI 182780 could suppress the stimulatory effect of E2 on the CaBP-9k expression of GH3 cells.The expression level of CaBP-9k was significantly reduced by coadministration of E2 with ⅡCI 182780 in GH3 cells,which meant the CaBP-9k expression was mediated through ERα pathway.The immunoprecipitation results further illustrated the fact that CaBP-9k could directly interact with ERα,and E2 could increase the interaction between CaBP-9k and ERα.Conclusion Estrogen might induce CaBP-9k expression via ERα mediated pathway and CaBP-9k could directly combine with ERα,suggesting that CaBP-9k might be involved in the biological effects mediated by ER pathway in GH3 cells.

关 键 词：GH3细胞 雌激素 雌激素受体 ⅡCI 182780 Galbindin-D9k 

分 类 号：R736.4[医药卫生—肿瘤]