目的 基于糖酵解基因构建风险评分模型,对经程序性细胞死亡蛋白-1(programmed cell death protein 1,PD-1)抑制剂治疗后的晚期肝细胞癌(hepatocellular carcinoma,HCC)患者的生存获益状况进行预测分析。方法 从癌症基因组图谱(the cance...目的 基于糖酵解基因构建风险评分模型,对经程序性细胞死亡蛋白-1(programmed cell death protein 1,PD-1)抑制剂治疗后的晚期肝细胞癌(hepatocellular carcinoma,HCC)患者的生存获益状况进行预测分析。方法 从癌症基因组图谱(the cancer genome atlas,TCGA)选取369例接受PD-1抑制剂治疗的HCC患者和50例正常肝组织的临床数据和高通量测序数据,患者年龄53~72(69.23±6.61)岁;使用“limma” R包进行差异分析,筛选出肝细胞癌组织中异常表达的糖酵解相关基因,将获得的基因进行多因素COX回归分析;利用LASSO分析筛选关键预测因子,以验证以上糖酵解相关基因是否与生存获益相关;以数据库的中值风险评分作为阈值,将患者分为高风险和低风险组,构建风险模型,利用Kaplan-Meier法绘制生存曲线评估基因特征对总体生存的预测价值;构建列线图模型来预测患者生存获益情况并进行模型验证。结果 鉴定HCC中差异表达的糖酵解相关基因发现,与正常肝组织相比,前10个上调基因中S100P和SPP1在HCC组织中高表达,而PLA2G2A和APOA4在HCC组织中表达下调;在前10个下调基因中,SPP2,LECT2,SLC10A1,CYP2A6,CYP3A4,HSD17B13,CYP2A7和IYD表达显著下调,而CYP7A1表达在肿瘤组织中相对于正常肝组织明显上调;多因素分析结果发现高表达的SPP1,TMEM92和EGLN3预示着HCC患者的不良预后,而SPP2,LECT2,SLC10A1,CYP3A4,HSD17B13和IYD的高表达预测HCC患者的预后更佳(均P <0.05);利用LASSO筛选确定了与HCC糖酵解相关的6个差异表达基因(SPP2,LECT2,SLC10A1,CYP3A4,HSD17B13和IYD);风险模型显示,随着风险评分的升高,患者生存时间呈逐渐下降趋势,随访结果为死亡的患者比例逐渐升高,两组患者中6个基因的表达水平存在显著差异,表明它们与风险评分密切相关,是预后模型中的关键分子;生存曲线结果显示低危组患者总生存时间显著高于高危组患者,Log-Rankχ2=4.933,P <0.001;列线图预测模型中六种基因预测总分430分,对应生存获益概率为73.98%,经验证模型安全可靠,实用性强。结论 通过评估晚期HCC患者经PD-1抑制剂治疗后糖酵解相关基因水平以及风险评分建立了列线图预测模型,揭示糖酵解相关基因可以预测HCC患者的生存获益状况,对患者的预后有一定的指示意义。展开更多
Enhanced glycolysis is a distinct feature associated with numerous stem cells and cancer cells.However,little is known about its regulatory roles in gene expression and cell fate determination.Here,we confirm that gly...Enhanced glycolysis is a distinct feature associated with numerous stem cells and cancer cells.However,little is known about its regulatory roles in gene expression and cell fate determination.Here,we confirm that glycolytic metabolism and lactate production decrease during the differentiation of mouse embryonic stem cells(mESCs).Importantly,acidic pH due to lactate accumulation can transiently prevent the silencing of mESC self-renewal in differentiation conditions.Furthermore,acidic pH partially blocks the differentiation of human ESCs(hESCs).Mechanistically,acidic pH downregulates AGO1 protein and de-represses a subset of mRNA targets of miR-290/302 family of microRNAs which facilitate the exit of naive pluripotency state in mESCs.Interestingly,AGO1 protein is also downregulated by acidic pH in cancer cells.Altogether,this study provides insights into the potential function and underlying mechanism of acidic pH in pluripotent stem cells(PSCs).展开更多
基金This work was supported by the National Key Research and Development Program of China(2016YFA0100701 and 2018YFA0107601)the National Natural Science Foundation of China(91640116,91940302,31622033,and 31821091)the Fundamental Research Funds for the Central Universities(3332018008).
文摘Enhanced glycolysis is a distinct feature associated with numerous stem cells and cancer cells.However,little is known about its regulatory roles in gene expression and cell fate determination.Here,we confirm that glycolytic metabolism and lactate production decrease during the differentiation of mouse embryonic stem cells(mESCs).Importantly,acidic pH due to lactate accumulation can transiently prevent the silencing of mESC self-renewal in differentiation conditions.Furthermore,acidic pH partially blocks the differentiation of human ESCs(hESCs).Mechanistically,acidic pH downregulates AGO1 protein and de-represses a subset of mRNA targets of miR-290/302 family of microRNAs which facilitate the exit of naive pluripotency state in mESCs.Interestingly,AGO1 protein is also downregulated by acidic pH in cancer cells.Altogether,this study provides insights into the potential function and underlying mechanism of acidic pH in pluripotent stem cells(PSCs).
