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新型雌激素受体GPER在乳腺癌MCF-7细胞他莫昔芬耐药中的作用及机制

, PP. 2249-2254

Keywords: 乳腺癌,他莫昔芬耐受,Bim,GPER/GPR,细胞凋亡

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Abstract:

目的研究乳腺癌他莫昔芬耐药细胞MCF-7R中新型雌激素受体(Gprotein-coupledestrogenreceptor,GPER)对促凋亡蛋白Bim的影响及其机制。方法倒置显微镜下观察MCF-7和MCF-7R经过浓度为1μmol/L的他莫昔芬(tamoxifen,TAM)处理后细胞形态的变化;qRT-PCR检测人乳腺癌细胞MCF-7及其他莫昔芬耐药株MCF-7R中促凋亡蛋白Bim(Bcl-2L11)的mRNA表达水平,Westernblot检测两种细胞株Bim蛋白表达水平和两种细胞中总的GPER和膜上GPER的表达水平;两种细胞中分别以(无水乙醇、TAM、GPER特异性抑制剂G15+TAM、GPER特异性激动剂G1)处理后,检测Bim的蛋白表达水平;MCF-7R细胞中分别抑制PI3K-Akt及MAPK/Erk两条信号通路后,再加入TAM,检测Bim的蛋白水平;流式细胞术检测细胞凋亡。结果倒置显微镜下发现MCF-7细胞经TAM处理后细胞大部分变透亮且悬浮,而MCF-7R无明显变化;MCF-7R细胞中促凋亡蛋白Bim的mRNA水平及蛋白水平较MCF-7都降低(P<0.05);耐药细胞中总GPER的蛋白表达量较MCF-7无明显变化而膜上的表达量升高(P<0.05);MCF-7经TAM处理后,Bim蛋白表达量增加(P<0.05),而MCF-7R中却无明显变化,但在MCF-7R中加入GPER特异性抑制剂G15后再用TAM处理,Bim蛋白水平增加(P<0.05);耐药细胞中PI3K/AKT及MAPK/Erk信号通路处于活化状态,抑制MAPK/Erk信号通路后再加入TAM,耐药细胞中促凋亡蛋白Bim的表达量增加(P<0.05);在MCF-7中加入TAM后细胞凋亡率明显升高(P<0.05),MCF-7R经TAM处理后无明显差异,但抑制GPER或Erk信号通路后,再加入TAM处理,细胞凋亡率明显增高(P<0.05)。?结论乳腺癌TAM耐药细胞MCF-7R中TAM作为GPER的激动剂,活化信号通路MAPK/Erk抑制Bim表达。抑制GPER或MAPK/Erk信号通路,可使耐药细胞对TAM恢复敏感性。

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