临床和实验医学杂志
臨床和實驗醫學雜誌
림상화실험의학잡지
JOURNAL OF CLINICAL AND EXPERIMENTAL MEDICINE
2015年
1期
1-4
,共4页
乳腺癌%PI3K/Akt通路%多药耐药%逆转
乳腺癌%PI3K/Akt通路%多藥耐藥%逆轉
유선암%PI3K/Akt통로%다약내약%역전
Breast cancer%PI3K Inhibitor%PI3K/ Akt pathway%Multidrug resistance%Reversal effect
目的:探讨 PI3K 抑制剂对三阴性人乳腺癌细胞多药耐药的逆转作用及其与 PI3K/ Akt 信号转导关系。方法采用 MTT 法测定三阴性乳腺癌细胞系 MBA - MB -231及其多药耐药细胞株 MBA - MB -231/ ADR 对经典化疗药物阿霉素的半数抑制浓度(IC50),以及 MBA - MB -231/ ADR 细胞株在 PI3K 抑制剂 LY294002给药前后对阿霉素的敏感性差异。Western Blot 检测 MDA - MB -231/ ADR 细胞株 LY294002给药前后,P - Akt、Akt、IκBα、NF -κB、P - gp 和cleaved - caspase -3表达水平差异。结果①MBA - MB -231和耐药细胞株 MBA - MB -231/ ADR 对阿霉素的 IC50分别为(0.36±0.03)μmol/ L 和(16.77±1.57)μmol/ L,耐药倍数为46.58倍。②LY294002给药后,耐药细胞株 MBA -MB -231/ ADR 对阿霉素的 IC50降至(2.59±0.07)μmol/ L,耐药倍数降至6.475,对药物敏感性显著增加。③耐药细胞株 MBA - MB -231/ ADR 中 PI3K/ Akt 和 NF -κB 通路被激活,细胞耐药相关蛋白 P - gp 处于高表达水平;LY294002处理之后,MBA - MB -231/ ADR 细胞中 PI3K/ Akt 和 NF -κB 通路被抑制,P - gp 表达水平下调,细胞凋亡相关的 cleaved- caspase -3表达上调。结论 PI3K 抑制剂 LY294002能有效逆转耐药细胞株 MBA - MB -231/ ADR 的耐药性,从而增强耐药细胞 MBA - MB -231/ ADR 对化疗药物阿霉素的敏感性。该研究结果提示 LY294002通过阻断 PI3K/ Akt 通路抑制下游 NF -κB 通路的活化和 P - gp 表达上调,从而参与 MBA - MB -231/ ADR 耐药性的逆转。
目的:探討 PI3K 抑製劑對三陰性人乳腺癌細胞多藥耐藥的逆轉作用及其與 PI3K/ Akt 信號轉導關繫。方法採用 MTT 法測定三陰性乳腺癌細胞繫 MBA - MB -231及其多藥耐藥細胞株 MBA - MB -231/ ADR 對經典化療藥物阿黴素的半數抑製濃度(IC50),以及 MBA - MB -231/ ADR 細胞株在 PI3K 抑製劑 LY294002給藥前後對阿黴素的敏感性差異。Western Blot 檢測 MDA - MB -231/ ADR 細胞株 LY294002給藥前後,P - Akt、Akt、IκBα、NF -κB、P - gp 和cleaved - caspase -3錶達水平差異。結果①MBA - MB -231和耐藥細胞株 MBA - MB -231/ ADR 對阿黴素的 IC50分彆為(0.36±0.03)μmol/ L 和(16.77±1.57)μmol/ L,耐藥倍數為46.58倍。②LY294002給藥後,耐藥細胞株 MBA -MB -231/ ADR 對阿黴素的 IC50降至(2.59±0.07)μmol/ L,耐藥倍數降至6.475,對藥物敏感性顯著增加。③耐藥細胞株 MBA - MB -231/ ADR 中 PI3K/ Akt 和 NF -κB 通路被激活,細胞耐藥相關蛋白 P - gp 處于高錶達水平;LY294002處理之後,MBA - MB -231/ ADR 細胞中 PI3K/ Akt 和 NF -κB 通路被抑製,P - gp 錶達水平下調,細胞凋亡相關的 cleaved- caspase -3錶達上調。結論 PI3K 抑製劑 LY294002能有效逆轉耐藥細胞株 MBA - MB -231/ ADR 的耐藥性,從而增彊耐藥細胞 MBA - MB -231/ ADR 對化療藥物阿黴素的敏感性。該研究結果提示 LY294002通過阻斷 PI3K/ Akt 通路抑製下遊 NF -κB 通路的活化和 P - gp 錶達上調,從而參與 MBA - MB -231/ ADR 耐藥性的逆轉。
목적:탐토 PI3K 억제제대삼음성인유선암세포다약내약적역전작용급기여 PI3K/ Akt 신호전도관계。방법채용 MTT 법측정삼음성유선암세포계 MBA - MB -231급기다약내약세포주 MBA - MB -231/ ADR 대경전화료약물아매소적반수억제농도(IC50),이급 MBA - MB -231/ ADR 세포주재 PI3K 억제제 LY294002급약전후대아매소적민감성차이。Western Blot 검측 MDA - MB -231/ ADR 세포주 LY294002급약전후,P - Akt、Akt、IκBα、NF -κB、P - gp 화cleaved - caspase -3표체수평차이。결과①MBA - MB -231화내약세포주 MBA - MB -231/ ADR 대아매소적 IC50분별위(0.36±0.03)μmol/ L 화(16.77±1.57)μmol/ L,내약배수위46.58배。②LY294002급약후,내약세포주 MBA -MB -231/ ADR 대아매소적 IC50강지(2.59±0.07)μmol/ L,내약배수강지6.475,대약물민감성현저증가。③내약세포주 MBA - MB -231/ ADR 중 PI3K/ Akt 화 NF -κB 통로피격활,세포내약상관단백 P - gp 처우고표체수평;LY294002처리지후,MBA - MB -231/ ADR 세포중 PI3K/ Akt 화 NF -κB 통로피억제,P - gp 표체수평하조,세포조망상관적 cleaved- caspase -3표체상조。결론 PI3K 억제제 LY294002능유효역전내약세포주 MBA - MB -231/ ADR 적내약성,종이증강내약세포 MBA - MB -231/ ADR 대화료약물아매소적민감성。해연구결과제시 LY294002통과조단 PI3K/ Akt 통로억제하유 NF -κB 통로적활화화 P - gp 표체상조,종이삼여 MBA - MB -231/ ADR 내약성적역전。
Objective The aim of this study is to investigate the reversal effect of multidrug resistance and its signal transduction mecha-nism of human breast cancer by inhibiting the PI3K/ Akt signaling pathway with PI3K Inhibitor. Methods Cells were treated with or without LY294002(the PI3K inhibitor). MTT assay was used to determine the half inhibitory concentration(IC50)of breast cell lines MBA - MB - 231 and MBA - MB - 231 / ADR to Adriamycin. Western Blot was applied to analyze the expression levels of P - Akt,Akt,IκBα,NF - κB,P - gp and caspase - 3 in MDA - MB - 231 / ADR cells. Results ①The IC50 of MBA - MB - 231and MBA - MB - 231 / ADR cells to Adriamycin were (0. 36 ± 0. 03)μmol/ L and(16. 77 ± 1. 57)μmol/ L. The reversal fold of MCF - 7 / ADR was 46. 58. ②The IC50 of MBA - MB - 231 / ADR reduced to(2. 59 ± 0. 07)μmol/ L and the reversal fold dropped to 6. 475 after treating with LY294002. ③Activation of the PI3K/ Akt signal path-way was observed in MBA - MB - 231 / ADR cells,which showed up - regulation of p - Akt,P - gp and NF - κB expression levels. However,af-ter treatment of LY29400,the PI3K/ Akt pathway inhibitor,P - gp and NF - κB were down - regulated,which suggested the PI3K/ Akt pathway was inhibited. Conclusion LY294002 could effectively reverse the multidrug resistance of MBA - MB - 231 / ADR cells by inhibiting the PI3K/Akt signaling pathway.