目的:构建乙肝病毒HBx蛋白瞬时表达小鼠模型,为研究HBx在HBV感染相关原发性肝细胞癌发生中的分子机制奠定基础。方法:8只6~8周龄雄性CD-1小鼠,尾静脉注射真核表达质粒pcDNA-HBx及空载体pcDNA3.0,6~8h处死小鼠并收集肝组织,抽提RNA及蛋白。RT-PCR和Westernblot检测HBx表达情况;实时荧光定量PCR检测FXR靶基因SHP和Cyp7a1的mRNA表达。结果:核酸和蛋白水平上,pcDNA-HBx注射组小鼠肝脏内均可检测到HBx的表达;空载体对照组肝组织中未检测到HBx的表达;肝组织中瞬时过表达的HBx可以有效调控FXR通路下游靶基因SHP和Cyp7a1的mRNA表达。结论:成功实现了HBx在小鼠肝脏中的瞬时高表达,为今后整体水平上研究HBx提供了有效的动物模型。
OBJECTIVE:To establish a transiently expressed HBx via hydrodynamic gene delivery in mice.METHODS:Two experimental groups of CD-1male mice(4mice per group)were injected with pcDNA-Flag-HBx plasmidor p cDNA e mpty v ector v ia t heir t ail v eins.M ice w ere t hen s acrificed a nd t heir l iver t issues w ere c ollected f or e xtraction o f R NAand protein.RESULTS:HBx was detected by PCR and Western blotting at the RNA and protein levels,respectively.Transiently expressed HBx effectively regulated the expression of typical target genes,small heterodimer partner(SHP)andcytochrome P4507A1(Cyp7a1)of farnesoid X receptor signaling,as shown by real-time PCR analyses.CONCLUSION:Atransient e xpression m odel o f H Bx v ia h ydrodynamic g ene d elivery i n m ice w as e stablished.