人结肠癌奥沙利铂耐药细胞HCT116/L-OHP的建立及其耐药机制初探

目的:建立人结肠癌奥沙利铂(oxaliplatin,L-OHP)耐药细胞HCT116/L-OHP,并初步探讨其可能的耐药机制。方法:通过逐步增加作用于亲代细胞HCT116的L-OHP浓度与间断大剂量L-OHP作用,建立耐药细胞HCT116/L-OHP;MTT法检测L-OHP、5-氟尿嘧啶(5-fluorouracil,5-FU)、顺铂(cisplatin)和7-乙基-10-羟基喜树碱(7-ethyl-10-hydrol-camptothecin,HCPT)对HCT116和HCT116/L-OHP细胞的细胞毒性;蛋白质印迹法检测相关耐药蛋白的表达;基因芯片检测信号通路的改变。结果:成功构建了稳定耐药的耐药细胞HCT116/L-OHP,耐药倍数为17倍,与5-FU、DDP和HCPT有不同程度的交叉耐药性。与HCT116细胞比较,HCT116/L-OHP细胞中P糖蛋白(P-glycoprotein,P-gp)、肺耐药蛋白(lung resistance protein,LRP)和谷胱甘肽S转移酶(glutathione S-transferase,GST)的表达上调(P<0.01),9条信号通路上调(P<0.05),其中细胞周期信号通路上调最明显,p53信号通路次之。结论:HCT116/L-OHP细胞具有稳定的耐药性,其耐药机制可能与细胞耐药蛋白表达、细胞周期和p53信号通路表达上调有关。

Establishment of an oxaliplatin-resistant human colon carcinoma HCT116/L-OHP cell and preliminary,exploration for the mechanism of resistance

Objective: To establish an oxaliplatin (L-OHP)-resistant human colon carcinoma HCT116/L-OHP cell, and to preliminarily explore the mechanism of resistance. Methods: Oxaliplatin-resistant HCT116/L-OHP cells were established by gradually increasing the concentration of L-OHP and intermittent treatment with high-dose concentration on parental cells (HCT116). The cytotoxicities in HCT116 and HCT116/L-OHP cells induced by L-OHP, 5-fluorouracil (5-FU), cisplatin (DDP) and 7-ethyl-10-hydrol-camptothecin (HCPT) wer...