CAFs条件培养基影响EC9706细胞能量代谢的分子机制探索

Exploration of the Molecular Mechanism of CAFs Conditioned Medium Affecting Energy Metabolism in EC9706 Cells

目的通过收集癌相关成纤维细胞(CAFs)的条件培养基,探索CAFs促进EC9706细胞能量代谢的分子机制。方法通过MTT检测细胞活性,以DMEM高糖培养基培养的EC9706作为对照,筛选最适合间接共培养的CAFs条件培养基(CAFM);比色法检测EC9706细胞上清中乳酸及葡萄糖含量;Seahorse系统能量代谢分析系统检测EC9706细胞在DMEM与CAFM中能量代谢情况;实时荧光定量聚合酶链式反应(Real time quantitative PCR,RT-qPCR)、蛋白免疫印迹法(Western blot)检测能量代谢相关分子mRNA及蛋白的表达。结果细胞融合度为50%-60%、70%-80%的CAFs条件培养基(CAFM)组与正常食管成纤维细胞条件培养基(NFM)相比,均有促进EC9706细胞增殖的作用(P<0.01),且在细胞融合度达70%-80%的CAFM各组中,与对照组相比,CAFM含量为60%时,对EC9706细胞的增殖作用显著升高(P<0.01)。与DMEM相比,CAFM可以上调EC9706细胞葡萄糖摄取、上清乳酸含量、基础呼吸值、基础糖酵解、补偿糖酵解(P<0.05),非线粒体耗氧、最大呼吸值、合成ATP耗氧量、备用呼吸能力(P<0.01)。RT-qPCR结果显示,CAFM还可上调EC9706细胞的低氧诱导因子-1α(HIF-1α)、己糖激酶2(HK2)、单羧酸转运蛋白1(MCT1)(P<0.05),葡萄糖转运蛋白1(GLUT1)、丙酮酸激酶2(PKM2)(P<0.01)mRNA的表达。蛋白免疫印迹法结果显示,与DMEM相比,HK2、PKM2、MCT1、GLUT1的蛋白表达均显著提高(P<0.01)。结论CAFM能够通过促进EC9706细胞HK2、PKM2、HK2、GLUT1、MCT1、MCT4的mRNA和蛋白的表达,促进EC9706细胞的能量代谢。

Objective To explore the molecular mechanism of CAFs promoting energy metabolism of EC9706 cells by collecting conditioned media of cancer-associated fibroblasts(CAFs).Methods Cell viability was detected by MTT,and the CAFs conditioned medium(CAFM)most suitable for indirect co-culture was selected with EC9706 cultured in DMEM high glucose medium as control.The contents of lactic acid and glucose in the supernatant of EC9706 cells were determined by colorimetry.The energy metabolism of EC9706 cells in DMEM and CAFM was detected by seahorse system energy metabolism analysis system.Real time quantitative polymerase chain reaction(RT-qPCR)and western blotting were used to detect the mRNA and protein expression of energy metabolism related molecules.Results Compared with normal esophageal fibroblast conditioned medium(NFM),CAFs conditioned medium of 50%-60%and 70%-80%cell fusion degree promoted the proliferation of EC9706 cells(P<0.01),and CAFM groups with 70%-80%cell fusion degree promoted the proliferation of EC9706 cells compared with the control group.When the CAFM content was 60%,the proliferation of EC9706 cells was significantly increased(P<0.01).Compared with DMEM,CAFM could increase glucose uptake,superlactate content,basal respiratory value,basal glycolysis,compensatory glycolysis(P<0.05),non-mitochondrial oxygen consumption,maximum respiratory value,oxygen consumption for ATP synthesis,and reserve respiratory capacity(P<0.01)of EC9706 cells.RT-qPCR results showed that CAFM could also up-regulate the Hypoxic-inducible factor-1α(HIF-1α),Hexokinase-2(HK2)and Monocarboxylic acid transporter 1(MCT1)of EC9706 cells(P<0.05).Expression of Glucose transporter 1(GLUT1),Pyruvate kinase 2(PKM2)mRNA(P<0.01).Western blot showed that compared with DMEM,the protein expression of HK2,PKM2,MCT1 and GLUT1 was significantly increased(P<0.01).Conclusion CAFM can promote energy metabolism of EC9706 cells by promoting mRNA and protein expressions of HK2,PKM2,HK2,GLUT1,MCT1 and MCT4 under in vitro culture conditions.