Liu Yong, He Chunxi, Huang Xianping
Department of Cardiothoracic Surgery, The Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, Zhejiang, 325027, China.
Oncotarget. 2017 Sep 6;8(43):75206-75216. doi: 10.18632/oncotarget.20663. eCollection 2017 Sep 26.
Platinum-based chemotherapeutic drugs are irreplaceable for the treatment of advanced non-small cell lung cancer (NSCLC). However, acquired drug resistance has become a major obstacle for the clinical application of chemotherapy on NSCLC. In the present study, we established carboplatin-resistant NSCLC models on A549 and PC9 cell lines, which were named A549/R and PC9/R. Besides the low sensitivity of A549/R and PC9/R to carboplatin treatment, they exhibited higher metabolism rate of glucose compared to their parental A549 and PC9 cells, respectively. Mechanically, we confirmed that overexpression of PKM2 in A549/R and PC9/R was responsible for the high glucose metabolism and carboplatin resistance. Metformin, an antidiabetic drug, was observed to increase the sensitivity of carboplatin-resistant NSCLC cells to carboplatin treatment and . Mechanically, metformin decreased expression of PKM2 and subsequently inhibited the glucose uptake, lactate generation and ATP production in A549/R and PC9/R. Therefore, metformin promoted carboplatin-induced apoptosis through the mitochondria pathway. In addition, we demonstrated that metformin treatment also impaired the cross-resistance of A549/R and PC9/R to cisplatin, etoposide and 5-fluorouracil.
铂类化疗药物在晚期非小细胞肺癌(NSCLC)的治疗中具有不可替代的作用。然而,获得性耐药已成为化疗在NSCLC临床应用中的主要障碍。在本研究中,我们在A549和PC9细胞系上建立了卡铂耐药的NSCLC模型,分别命名为A549/R和PC9/R。除了A549/R和PC9/R对卡铂治疗的低敏感性外,它们与亲本A549和PC9细胞相比,分别表现出更高的葡萄糖代谢率。从机制上讲,我们证实A549/R和PC9/R中PKM2的过表达是高糖代谢和卡铂耐药的原因。观察到抗糖尿病药物二甲双胍可增加卡铂耐药NSCLC细胞对卡铂治疗的敏感性。从机制上讲,二甲双胍降低了PKM2的表达,随后抑制了A549/R和PC9/R中的葡萄糖摄取、乳酸生成和ATP产生。因此,二甲双胍通过线粒体途径促进卡铂诱导的细胞凋亡。此外,我们证明二甲双胍治疗还削弱了A549/R和PC9/R对顺铂、依托泊苷和5-氟尿嘧啶的交叉耐药性。