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作 者:徐晓武 杨小敏 胡经纬[3] 郑志强[3] 李德春[1]
机构地区:[1]苏州大学附属第一医院普通外科,江苏省215000 [2]温州市人民医院病理科 [3]温州医科大学附属第二医院普通外科
出 处:《中华普通外科杂志》2017年第9期774-777,共4页Chinese Journal of General Surgery
基 金:浙江省卫生科技计划资助项目(2017191494)
摘 要:目的探讨动力相关蛋白I(dynamin—related protein1,DRPI)基因沉默对人胃癌细胞株MKN-45奥沙利铂敏感性的影响及其可能的机制。方法构建靶向DRP1基因的短发夹状RNA(shRNA)慢病毒载体,转染至293T细胞,再感染MKN-45细胞,用qRT—PCR鉴定沉默效率。用终浓度为0.5、1.0、2.0、4.0、8.0、16.0及32.0μg/ml的奥沙利铂分别处理实验组、阴性对照组(NC组)和空白对照组(CON组),48h后采用MTT实验检测细胞存活率并计算半数抑制浓度(IC50),流式细胞术检测细胞凋亡,Western blot检测LC3-Ⅱ和p62表达。结果实验组的DRP1mRNA(0.087±0.025)显著低于NC组(1.040±0.020)和CON组(1.027±0.021)(均P〈0.001)。随奥沙利铂浓度增加,实验组的细胞存活率明显降低(均P〈0.001)。实验组的IC50值(14.1±0.4)μg/ml较NC组(20.0±1.1)μg/ml和CON组(20.0±1.8)μg/ml降低(均P〈0.01);实验组的细胞凋亡率(9.4%±1.1%)较NC组(6.4%±0.8%)和CON组(6.5%±1.0%)升高(均P〈0.05);实验组的LC3,Ⅱ(0.36±0.03)较NC组(0.62±0.04)和CON组(0.59±0.07)降低(均P〈0.01);实验组的P62(0.58±0.04)较NC组(0.39±0.04)和CON组(0.36±0.04)升高(均P〈0.01)。结论DRP1介导的线粒体自嗾提高了MKN-45细胞对奥沙利铂的敏感件.Objective To investigate the effects of DRP1 gene silencing on the chemosensitivity of human gastric cancer MKN-45 ceils to oxaliplatin. Methods A lentiviral vector containing short hairpin RNA (shRNA) targeting DRP1 was constructed and cotransfected to MKN-45 cells. Levels of DRPlmRNA was detected by quantitative RT-PCR, With a final concentration of 0. 5, 1.0, 2. 0, 4.0, 8.0, 16.0 and 32. 0 μg/ml of oxaliplatin processing Lv-shRNA-DRP1 group ( experimental group), negative control group (NC group), and blank control group (CON group) respectively. Cellular proliferation was determined by MTT assay and calculate half maximal inhibitory concentration ( IC50 ). Celluar apoptosis was analyzed by flowcytometry. Using Western blot to detect LC3-Ⅱ and p62 expression. Results DRPlmRNA levels in experimental group ( 0. 087 ± 0. 025 ) was significantly inhibited as compared with NC group ( 1. 040 ± 0. 020) and CON group ( 1. 027 ±0. 021 ) (P 〈0. 001 ). Cellular survival rate decreased in a oxaliplatin dose-dependent manner ( all P 〈 0. 001 ). IC50 value in experimental group ( 14. 1 ± 0.4 ) μg/ml dropped compared with NC group ( 20. 0 ±1.1 ) μg/ml and CON group ( 20. 0 ± 1.8 ) μg/ml ( both P 〈 0. 01 ). Celluar apoptosis rates in experimental group (9.4%± 1.1% ) elevated in contrast with NC group (6. 4% ±0. 8% ) and CON group (6. 5% ± 1.0% ) (both P 〈0. 05), expression of LC3 in experimental group(0. 36 ±0. 03 ) dropped compared with NC group ( 0. 62 ± 0. 04 ) and CON group ( 0. 59 ± 0.07 ) ( both P 〈 0. 05 ), expression of P62 in experimental group ( 0. 58 ±0. 04 ) increased in contrast with NC group (0. 39 ± 0. 04) and CON group (0. 36 ± 0. 04) ( both P 〈 0. 05 ). Conclusions DRPl-mediated overactive mitophagy plays a vital role in increasing the sensitivity of gastric cancer cell MKN- 45 to oxaliplatin.
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