FFJ-5下调PKM2抑制MCF7生长及逆转MCF7/DOX细胞耐药性的研究

FFJ-5 inhibits growth of MCF7 cells and reverses drug resistance of MCF7 / DOX cells via down-regulation of PKM2

目的探讨FFJ-5对人乳腺癌细胞MCF7及其耐药细胞MCF7/DOX的作用及其机制。方法采用MTT法检测FFJ-5对MCF7及MCF7/DOX细胞的增殖抑制作用及其对柔红霉素(doxorubicin,DOX)在耐药细胞MCF7/DOX中化疗敏感性的影响;Western blot检测FFJ-5对EGFR、p-EGFR、Akt、p-Akt、PKM2、caspase-3、cleaved caspase-3、PARP、cleaved PARP及P-gp蛋白表达的影响;DNA ladder分析检测FFJ-5对细胞基因组DNA的影响;RT-PCR检测低剂量FFJ-5对多药耐药基因MDR1 mRNA水平的影响。结果 FFJ-5抑制了MCF7细胞生长,降低了MCF7细胞中EGFR、Akt的表达及活性,下调了PKM2水平;FFJ-5可激活caspase-3、促使基因组DNA断裂;同时FFJ-5也能抑制耐药细胞MCF7/DOX生长,并增强DOX在MCF7/DOX细胞中的活性,同时降低了MCF7/DOX细胞中EGFR、p-EGFR及PKM2水平,但对MDR1 mRNA水平无影响。结论 FFJ-5可通过抑制EGFRAkt-PKM2通路及激活线粒体凋亡相关因子caspase-3来抑制MCF7细胞生长,并诱导其凋亡,并可逆转MCF7/DOX的耐药性。

Aim To investigate the roles of FFJ-5 in human breast cancer MCF7 cells and drug-resistant＆nbsp;MCF7/DOX cells and to explore its mechanisms. Methods MTT assay was used to detect the effect of＆nbsp;FFJ-5 on MCF7 and MCF7/DOX cell proliferation and sensitivity of doxorubicin in MCF7/DOX cells.West-ern blot was used to investigate the effect of FFJ-5 on expression of EGFR,p-EGFR,Akt,p-Akt,PKM2, cleaved caspase-3,cleaved PARP and P-gp.DNA lad-der analysis was performed to determine the effect of FFJ-5 on genomic DNA.RT-PCR was performed to de-tect the influence of FFJ-5 on multidrug resistance gene MDR1 mRNA levels.Results The results showed that FFJ-5 inhibited the growth of MCF7 ,inhibited the expression and activity of EGFR and Akt,and conse-quently reduced the expression of PKM2 in MCF7＆nbsp;cells;FFJ-5 activated caspase-3 and induced genomic DNA fragmentation;FFJ-5 also inhibited the growth of MCF7/DOX cells and enhanced the anti-tumor activity of doxorubicin in MCF7/DOX cells.Conclusion The results suggest that FFJ-5 could inhibit MCF7 cell growth and induce MCF7 cell apoptosis through inhibi-tion of EGFR-Akt-PKM2 pathway and activation of ap-optosis-related factors caspase-3 , meanwhile FFJ-5 could also reverse the resistance of MCF7/DOX.