Nonalcoholic fatty liver disease(NAFLD)is one of the most common causes of liver dysfunction worldwide,and its prevalence is highly associated with genetic susceptibility.The transmembrane 6 superfamily member 2(TM6SF...Nonalcoholic fatty liver disease(NAFLD)is one of the most common causes of liver dysfunction worldwide,and its prevalence is highly associated with genetic susceptibility.The transmembrane 6 superfamily member 2(TM6SF2)E167K variant represents a general genetic determinant of hepatic triglyceride content and lobular inflammation,and its presence appears to be directly involved in the pathogenesis and development of NAFLD.Although this variant appears to be a novel powerful modifier in the development of NAFLD,whether it is associated with an increased risk of NAFLD-refated liver fibrosis and hepatocellular carcinoma(HCC)remains to be determined.The aim of this review is to describe the functions of the TM6SF2 E167K variant and its association with NAFLD,with particular emphasis on the underlying mechanisms of its role in the development and progression of NAFLD.Additionally,the links between the TM6SF2 E167K variant and NAFLD-related liver fibrosis and HCC will be discussed.展开更多
Background and Aims:Accumulated evidence has shown that chronic liver inflammation is one of the main risks of hepatocellular carcinoma(HCC),and E167K variant of the transmembrane 6 superfamily member 2(TM6SF2)plays a...Background and Aims:Accumulated evidence has shown that chronic liver inflammation is one of the main risks of hepatocellular carcinoma(HCC),and E167K variant of the transmembrane 6 superfamily member 2(TM6SF2)plays an important role in the progression of chronic liver diseases and HCC.The aim of this study was to explore effects of the TM6SF2 E167K variant on expression of the inflammatory cytokines TNF-cα,IL-2,IL-6 and IL-8 in the HCC cell line HEPA 1-6.Methods:HEPA 1-6 cells were infected with lentivirus containing either the TM6SF2 E167K variant or TM6SF2 wildtype,or control plasmids.Quantitative real-time polymerase chain reaction(qRT-PCR)and western blotting were conducted to analyze the expression of the inflammatory cytokines TNF-α,IL-2,IL-6 and IL-8.A t-test was used for statistical analysis.Results:Compared with the control group and TM6SF2 overexpression group,the relative expression of IL-2 and IL-6 mRNAs were significantly elevated in the TM6SF2 E167K overexpression group(p<0.05).The relative mRNA expression of IL-8 in theTM6SF2 and TM6SF2 E167K overexpression groups were increased compared to the control group(p<0.05).No obvious differences were observed for the expression of TNF-αin each group.The expression of TNF-α,IL-2,IL-6 and IL-8 that was tested by western blotting showed the same trends as the qRT-PCR results.Conclusions:In conclusion,the E167K variant of theTM6SF2 gene could promote the expression of inflammatory cytokines IL-2 and IL-6 in HEPA 1-6 cells,suggesting that the TM6SF2 E167K variant may accelerate the progression of HCC.展开更多
基金This study was supported by Qingdao Livelihood,Science and Technology Project,China(14-2-3-17-nsh)Qingdao Key Health Discipline Development Fund.In addition,this project was supported by the Medjaden Academy & Research Foundation for Young Scientists(Grant MJA20150831)
文摘Nonalcoholic fatty liver disease(NAFLD)is one of the most common causes of liver dysfunction worldwide,and its prevalence is highly associated with genetic susceptibility.The transmembrane 6 superfamily member 2(TM6SF2)E167K variant represents a general genetic determinant of hepatic triglyceride content and lobular inflammation,and its presence appears to be directly involved in the pathogenesis and development of NAFLD.Although this variant appears to be a novel powerful modifier in the development of NAFLD,whether it is associated with an increased risk of NAFLD-refated liver fibrosis and hepatocellular carcinoma(HCC)remains to be determined.The aim of this review is to describe the functions of the TM6SF2 E167K variant and its association with NAFLD,with particular emphasis on the underlying mechanisms of its role in the development and progression of NAFLD.Additionally,the links between the TM6SF2 E167K variant and NAFLD-related liver fibrosis and HCC will be discussed.
基金supported by grants from the National Natural Science Foundation of China(No.31770837)the Key Research Project of Shandong Province(No.2016GSF201217)the Qingdao,Shinan District Science and Technology Development Project Fund(No.2016-3-016-YY)
文摘Background and Aims:Accumulated evidence has shown that chronic liver inflammation is one of the main risks of hepatocellular carcinoma(HCC),and E167K variant of the transmembrane 6 superfamily member 2(TM6SF2)plays an important role in the progression of chronic liver diseases and HCC.The aim of this study was to explore effects of the TM6SF2 E167K variant on expression of the inflammatory cytokines TNF-cα,IL-2,IL-6 and IL-8 in the HCC cell line HEPA 1-6.Methods:HEPA 1-6 cells were infected with lentivirus containing either the TM6SF2 E167K variant or TM6SF2 wildtype,or control plasmids.Quantitative real-time polymerase chain reaction(qRT-PCR)and western blotting were conducted to analyze the expression of the inflammatory cytokines TNF-α,IL-2,IL-6 and IL-8.A t-test was used for statistical analysis.Results:Compared with the control group and TM6SF2 overexpression group,the relative expression of IL-2 and IL-6 mRNAs were significantly elevated in the TM6SF2 E167K overexpression group(p<0.05).The relative mRNA expression of IL-8 in theTM6SF2 and TM6SF2 E167K overexpression groups were increased compared to the control group(p<0.05).No obvious differences were observed for the expression of TNF-αin each group.The expression of TNF-α,IL-2,IL-6 and IL-8 that was tested by western blotting showed the same trends as the qRT-PCR results.Conclusions:In conclusion,the E167K variant of theTM6SF2 gene could promote the expression of inflammatory cytokines IL-2 and IL-6 in HEPA 1-6 cells,suggesting that the TM6SF2 E167K variant may accelerate the progression of HCC.
