目的探讨沉默HBx基因对HepG2.2.15细胞脂质代谢相关基因表达的影响。方法设立空白对照组(HepG2.2.15细胞)、阴性对照组(HepG2.2.15细胞转染阴性HK质粒)、shHBx转染组(HepG2.2.15细胞转染shHBx质粒)和HepG2组(HepG2细胞)。构建针对HBx基...目的探讨沉默HBx基因对HepG2.2.15细胞脂质代谢相关基因表达的影响。方法设立空白对照组(HepG2.2.15细胞)、阴性对照组(HepG2.2.15细胞转染阴性HK质粒)、shHBx转染组(HepG2.2.15细胞转染shHBx质粒)和HepG2组(HepG2细胞)。构建针对HBx基因的shHBx质粒,转染HepG2.2.15细胞,荧光显微镜及Western blot检测转染质粒24～96 h绿色荧光蛋白和HBx蛋白的表达以确定质粒的最佳干扰时间,根据结果予油酸钠刺激细胞,甘油三酯(TG)检测细胞脂肪变程度,RT-PCR检测固醇调节元件结合蛋白(sterol regulatory element binding protein-1c,SREBP-1c)mRNA的表达,Western blot检测肝X受体α(liver x receptor alpha,LXRα)及脂肪酸合成酶(fatty acid synthase,FAS)蛋白的表达。结果成功构建shHBx质粒并转染HepG2.2.15细胞;与空白对照组和阴性对照组比较,shHBx转染组HBx蛋白表达明显下降,于转染后48～72 h表达最低[(0.337±0.042)vs(0.577±0.032),(0.333±0.032)vs(0.654±0.049),P<0.01],差异有统计学意义;随着油酸钠处理时间延长,各组TG含量、SREBP-1c mRNA水平、LXRα和FAS蛋白表达均逐渐增加,与空白对照组和阴性对照组比较,同一时间点,shHBx转染组和HepG2组中表达较低[TG:(26.51±1.98)μg/mgvs(37.16±6.32)μg/mg;SREBP-1c:0.418±0.051 vs 0.516±0.037;LXRα:0.463±0.047 vs 0.630±0.026;FAS:0.463±0.047 vs 0.630±0.017,P<0.01],差异有统计学意义,而shHBx转染组与HepG2组相比水平近似,差异无统计学意义(P>0.05)。结论 HBx在HepG2.2.15细胞脂变中具有重要作用,可能通过调节LXRα、FAS、SREBP-1c表达影响肝细胞脂代谢。展开更多
从细胞水平探讨乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)与肝细胞脂肪变性的关系,并探讨其可能分子机制。油红O染色及细胞内甘油三酯含量测定鉴定HepG2.2.15细胞和HepG2细胞的脂变程度;Western blotting检测HBx,肝X受体(liv...从细胞水平探讨乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)与肝细胞脂肪变性的关系,并探讨其可能分子机制。油红O染色及细胞内甘油三酯含量测定鉴定HepG2.2.15细胞和HepG2细胞的脂变程度;Western blotting检测HBx,肝X受体(liver X receptor alpha,LXRα)及脂肪酸合成酶(fatty acid synthase,FAS)蛋白的表达。结果显示,C2.2.15组细胞脂变程度较CG2组细胞重。O2.2.15组细胞在24,48及72h的脂变程度及TG含量均较同一时间段的OG2组增加;Western blotting结果显示,HepG2.2.15细胞内有HBx蛋白表达,而HepG2细胞则无此蛋白表达;C2.2.15组细胞LXRα及FAS蛋白表达强度较CG2组细胞高。HBx蛋白与肝细胞脂肪变性存在密切的关系,其机制可能与HBx/LXRα/FAS信号通路有关。展开更多
Steatosis in patients with chronic hepatitis C (CHC) may be the result of both viral and host factors. To evaluate: (1) the relationship between steatosis and either host or viral factors; (2) the correlation between ...Steatosis in patients with chronic hepatitis C (CHC) may be the result of both viral and host factors. To evaluate: (1) the relationship between steatosis and either host or viral factors; (2) the correlation between steatosis and fibrosi s in patientswith CHC. A consecutive series of 349 patients were evaluated for s teatosis. At liver biopsy, patients were tested for virological, and laboratory analysis and questioned for alcohol consumption. Logistic regression analysis de monstrated that steatosis was independently associated with genotype 3a (odds ra tio, OR 3.5), alcohol intake at the time of biopsy (OR 2.6) and age >35 years (O R 2.7). In multivariate analysis the presence of fibrosis was associated with pa st alcohol abuse (OR 3.7), and age older than 44 years (OR 2.2). Overall, a weak correlation was found between grade of steatosis and fibrosis score (r=0.861, P =0.05), which disappeared excluding patients without past or current alcohol int ake. A direct correlation emerged between grade of steatosis and both ‘grading ’and ‘staging’only in patients with genotypes other than 3a. Genotype 3a is t hemain risk factor for steatosis in patientswith CHC. The grade of steatosis cor related with both grading and staging only in patients with genotypes other than 3a and this relationship is strictly linked to alcohol consumption.展开更多
文摘目的探讨沉默HBx基因对HepG2.2.15细胞脂质代谢相关基因表达的影响。方法设立空白对照组(HepG2.2.15细胞)、阴性对照组(HepG2.2.15细胞转染阴性HK质粒)、shHBx转染组(HepG2.2.15细胞转染shHBx质粒)和HepG2组(HepG2细胞)。构建针对HBx基因的shHBx质粒,转染HepG2.2.15细胞,荧光显微镜及Western blot检测转染质粒24～96 h绿色荧光蛋白和HBx蛋白的表达以确定质粒的最佳干扰时间,根据结果予油酸钠刺激细胞,甘油三酯(TG)检测细胞脂肪变程度,RT-PCR检测固醇调节元件结合蛋白(sterol regulatory element binding protein-1c,SREBP-1c)mRNA的表达,Western blot检测肝X受体α(liver x receptor alpha,LXRα)及脂肪酸合成酶(fatty acid synthase,FAS)蛋白的表达。结果成功构建shHBx质粒并转染HepG2.2.15细胞;与空白对照组和阴性对照组比较,shHBx转染组HBx蛋白表达明显下降,于转染后48～72 h表达最低[(0.337±0.042)vs(0.577±0.032),(0.333±0.032)vs(0.654±0.049),P<0.01],差异有统计学意义;随着油酸钠处理时间延长,各组TG含量、SREBP-1c mRNA水平、LXRα和FAS蛋白表达均逐渐增加,与空白对照组和阴性对照组比较,同一时间点,shHBx转染组和HepG2组中表达较低[TG:(26.51±1.98)μg/mgvs(37.16±6.32)μg/mg;SREBP-1c:0.418±0.051 vs 0.516±0.037;LXRα:0.463±0.047 vs 0.630±0.026;FAS:0.463±0.047 vs 0.630±0.017,P<0.01],差异有统计学意义,而shHBx转染组与HepG2组相比水平近似,差异无统计学意义(P>0.05)。结论 HBx在HepG2.2.15细胞脂变中具有重要作用,可能通过调节LXRα、FAS、SREBP-1c表达影响肝细胞脂代谢。
文摘从细胞水平探讨乙型肝炎病毒X蛋白(hepatitis B virus X protein,HBx)与肝细胞脂肪变性的关系,并探讨其可能分子机制。油红O染色及细胞内甘油三酯含量测定鉴定HepG2.2.15细胞和HepG2细胞的脂变程度;Western blotting检测HBx,肝X受体(liver X receptor alpha,LXRα)及脂肪酸合成酶(fatty acid synthase,FAS)蛋白的表达。结果显示,C2.2.15组细胞脂变程度较CG2组细胞重。O2.2.15组细胞在24,48及72h的脂变程度及TG含量均较同一时间段的OG2组增加;Western blotting结果显示,HepG2.2.15细胞内有HBx蛋白表达,而HepG2细胞则无此蛋白表达;C2.2.15组细胞LXRα及FAS蛋白表达强度较CG2组细胞高。HBx蛋白与肝细胞脂肪变性存在密切的关系,其机制可能与HBx/LXRα/FAS信号通路有关。
文摘Steatosis in patients with chronic hepatitis C (CHC) may be the result of both viral and host factors. To evaluate: (1) the relationship between steatosis and either host or viral factors; (2) the correlation between steatosis and fibrosi s in patientswith CHC. A consecutive series of 349 patients were evaluated for s teatosis. At liver biopsy, patients were tested for virological, and laboratory analysis and questioned for alcohol consumption. Logistic regression analysis de monstrated that steatosis was independently associated with genotype 3a (odds ra tio, OR 3.5), alcohol intake at the time of biopsy (OR 2.6) and age >35 years (O R 2.7). In multivariate analysis the presence of fibrosis was associated with pa st alcohol abuse (OR 3.7), and age older than 44 years (OR 2.2). Overall, a weak correlation was found between grade of steatosis and fibrosis score (r=0.861, P =0.05), which disappeared excluding patients without past or current alcohol int ake. A direct correlation emerged between grade of steatosis and both ‘grading ’and ‘staging’only in patients with genotypes other than 3a. Genotype 3a is t hemain risk factor for steatosis in patientswith CHC. The grade of steatosis cor related with both grading and staging only in patients with genotypes other than 3a and this relationship is strictly linked to alcohol consumption.
