%0 Journal Article %T 反馈激活STAT3调控HER2阳性乳腺癌细胞拉帕替尼耐药的机制 %A 张启芳 %A 柏华 %A 段娟娟 %A 胡晓红 %A 雷秀 %J 肿瘤防治研究 %D 2019 %R 10.3971/j.issn.1000-8578.2019.18.1410 %X 摘要 目的 探讨白介素-6(IL-6)在HER2阳性BT-474 乳腺癌细胞拉帕替尼耐药中的作用及其相关分子机制。方法 建立BT-474耐拉帕替尼细胞株(BT-474R)。Western blot检测耐药标志蛋白P-gp的表达,MTT法检测BT-474R细胞的IC50。Caspase-Glo? 3/7法检测拉帕替尼BT-474R与BT-474细胞的Caspase3/7酶活性的变化。Western blot法检测IL-6、p-STAT3、STAT3、Cleaved Caspase 3的蛋白表达水平;RNAi法沉默STAT3基因表达;Caspase-Glo? 3/7法和Annexin V-FITC/PI染色检测沉默后细胞凋亡程度。结果 BT-474R组P-gp表达水平显著高于BT-474组(P<0.05)。 拉帕替尼增强STAT3活性,沉默STAT3基因可恢复BT-474R细胞对拉帕替尼的敏感度、增加cleaved caspase 3蛋白表达水平和Caspase3/7 酶的活性(P<0.01)。沉默STAT3增强了拉帕替尼诱导的耐药细胞凋亡(P<0.01)。拉帕替尼诱导的IL-6表达和分泌激活STAT3,用IL-6抗体抑制拉帕替尼诱导的IL-6,可以阻止拉帕替尼刺激STAT3活性。结论 拉帕替尼通过诱导BT-474细胞分泌IL-6激活STAT3信号通路,增加HER2阳性乳腺癌细胞对拉帕替尼的耐药性 %K Three Cases Report and Literature Review %K Review on Brain Metastases in HER2-positive Breast Cancer Patients %K Drug Resistance Reversal of Doxorubicin-resistant Human Leukemia Cell Line K562/ADM through Down-regulating MDR1 Gene %K Establishment of Methotrexate Enantiomers Resistant A549 Cell Lines of Human NSCCL and Its Biological Characteristics %K Effect and Mechanism of Isotetrandrine to Enhance Doxorubicin Sensitivity in Multidrug Resistance Tumor Cells %K Establishment of Melphalan2resistant Multiple Myeloma Cell Line MOLP22/ R and Its Multidrug Resistant Mechanisms %K Lethal Effect of Combination of Tetramethylpyrazine and Fluorouracil in Multidrug Resistance of Gastric Carcinoma Cell Lines SGC-7901/ADR %U http://www.zlfzyj.com/CN/abstract/abstract9370.shtml