Hepatocellular carcinoma(HCC)remains the third leading cause of cancer-related deaths worldwide;however,its therapeutic options are limited.Understanding the molecular mechanisms of HCC could provide insight into new ...Hepatocellular carcinoma(HCC)remains the third leading cause of cancer-related deaths worldwide;however,its therapeutic options are limited.Understanding the molecular mechanisms of HCC could provide insight into new therapies.Emerging studies indicate the important role of long-noncoding RNAs(lncRNAs)in the pathogenesis of HCC.The expression of the well-studied lncRNA taurine upregulated gene 1(TUG1)is upregulated in HCC tissues,but its transcriptomic effects in HCC cells remain unexplored.We established TUG1-knockdown and control HCC cells for RNA-seq experiments.KEGG analysis revealed glycolysis as the top enriched pathway upon TUG1 silencing.Accordingly,TUG1-depleted HCC cells showed impairments in glucose uptake,ATP synthesis,and lactate production.Clinical HCC tissue data revealed positive gene expression correlations between TUG1 and several glycolysis-related genes.To identify a molecular function of TUG1 in glycolysis,we explored the competing endogenous model and used bioinformatic tools to find the five microRNAs(miRNAs)that had the most binding sites for TUG1.Among these miRNAs,miR-122-5p exhibited an inverse correlation in gene expression with most TUG1-regulated glycolysis genes,including PKM,ALDOA,ENO2,and PFKM.Dual-luciferase assays demonstrated the direct interaction between TUG1 and miR-122-5p and between miR-122-5p and the 3ʹuntranslated regions of both PKM and ALDOA.We further showed that inhibition of miR-122-5p alleviated the suppression of glycolysis induced by TUG1 depletion.Together,our RNA-seq analysis of TUG1-depleted HCC cells,combined with clinical data,reveals a critical role of TUG1 in regulating glycolysis and provides new insight into its oncogenic function in HCC.展开更多
基金supported by the Thailand Science Research and Innovation Fund Chulalongkorn University(Grant No.HEAF67300078)the 90th Anniversary Scholarship,Chulalongkorn University Ratchadapisek Sompoch Fund(Grant No.Batch#55,T.Boonto)the Center of Excellence in Hepatitis and Liver Cancer,Faculty of Medicine,Chulalongkorn University.T.Boonto was supported by the scholarship from the Graduate School,Chulalongkorn University,to commemorate the 72^(nd) anniversary of His Majesty King Bhumibol Adulyadej(Grant No.Batch#22).
文摘Hepatocellular carcinoma(HCC)remains the third leading cause of cancer-related deaths worldwide;however,its therapeutic options are limited.Understanding the molecular mechanisms of HCC could provide insight into new therapies.Emerging studies indicate the important role of long-noncoding RNAs(lncRNAs)in the pathogenesis of HCC.The expression of the well-studied lncRNA taurine upregulated gene 1(TUG1)is upregulated in HCC tissues,but its transcriptomic effects in HCC cells remain unexplored.We established TUG1-knockdown and control HCC cells for RNA-seq experiments.KEGG analysis revealed glycolysis as the top enriched pathway upon TUG1 silencing.Accordingly,TUG1-depleted HCC cells showed impairments in glucose uptake,ATP synthesis,and lactate production.Clinical HCC tissue data revealed positive gene expression correlations between TUG1 and several glycolysis-related genes.To identify a molecular function of TUG1 in glycolysis,we explored the competing endogenous model and used bioinformatic tools to find the five microRNAs(miRNAs)that had the most binding sites for TUG1.Among these miRNAs,miR-122-5p exhibited an inverse correlation in gene expression with most TUG1-regulated glycolysis genes,including PKM,ALDOA,ENO2,and PFKM.Dual-luciferase assays demonstrated the direct interaction between TUG1 and miR-122-5p and between miR-122-5p and the 3ʹuntranslated regions of both PKM and ALDOA.We further showed that inhibition of miR-122-5p alleviated the suppression of glycolysis induced by TUG1 depletion.Together,our RNA-seq analysis of TUG1-depleted HCC cells,combined with clinical data,reveals a critical role of TUG1 in regulating glycolysis and provides new insight into its oncogenic function in HCC.
文摘目的探讨长链非编码RNA(long non-coding RNA,LncRNA)牛磺酸上调基因1(taurine up-regulated gene 1,TUG1)对非小细胞肺癌(non-small cell lung cancer,NSCLC)细胞生物学行为的影响及分子机制。方法采用qRT-PCR、Western blot分别检测组织(NSCLC癌组织、癌旁组织)和细胞(人正常气管上皮细胞HBE及NSCLC细胞A549、H2009、H1975)中TUG1、miR-142-5p及PD-L1的表达。将pcDNA-TUG1、si-TUG1、miR-142-5p mimics、si-TUG1+anti-miR-142-5p分别转染于A549,qRT-PCR、Western blot分别检测细胞中TUG1、miR-142-5p及PD-L1表达;CCK-8检测细胞增殖;Transwell检测细胞迁移、侵袭;双荧光素酶基因实验分别检测TUG1和miR-142-5p、miR-142-5p和PD-L1的关系;RNA免疫共沉淀检测miR-142-5p与TUG1的相互作用。结果NSCLC组织中TUG1(2.28±0.23 vs 1.00±0)、PD-L1(0.93±0.11 vs 0.25±0.01)表达高于癌旁组织,miR-142-5p(0.31±0.02 vs 1.00±0)表达低于癌旁组织(P<0.05);与人正常气管上皮细胞HBE比较,NSCLC细胞A549中TUG1(3.21±0.27 vs 1.00±0)、PD-L1(1.12±0.12 vs 0.24±0.01)表达水平最高,miR-142-5p(0.23±0.02 vs 1.00±0)表达水平最低(P<0.05);过表达TUG1促进A549细胞增殖、迁移、侵袭;下调TUG1或上调miR-142-5p表达均对A549细胞增殖、迁移、侵袭能力发挥抑制作用;TUG1负调控miR-142-5p,miR-142-5p负调控PD-L1;下调miR-142-5p减弱了沉默TUG1对A549细胞增殖、迁移及侵袭的抑制作用。结论TUG1在NSCLC组织和细胞中高表达,沉默TUG1通过miR-142-5p/PD-L1轴抑制A549细胞的增殖、迁移与侵袭。
