基因1b型HCV核心蛋白不同功能区域对HepG2细胞生长的影响

目的 研究基因1b型丙型肝炎病毒(HCV)不同病毒株编码的核心蛋白(CORE):癌中心株(T)、癌旁株(NT)、C191(HCV-J6)及同一病毒株(T)编码的不同功能区域(1～172、1～126、1～58、59～126、127～172 AA)在HCV致病机制中的作用,为治疗HCV感染提供靶位.方法 将含有3个不同病毒株(T、NT及C191)及T不同功能区域的CORE真核表达质粒,转染到HepG2细胞,用流式细胞仪检测Annexin Ⅴ/PI,并用细胞生长实时观察仪观察细胞生长曲线.结果 基因1b型T、NT、C191和T不同功能区域的CORE均能诱导HepG2细胞凋亡和坏死且抑制了细胞的生长,其中,T诱导细胞凋亡和坏死及抑制细胞生长强于NT和C191, T的CORE的N端1～58 AA诱导细胞凋亡和坏死及抑制细胞生长均高于其他功能区域.结论 HCV基因1b型不同病毒株及同一病毒株编码的CORE不同功能区域的分子致病机制存在一定的差异,N端的1～58 AA在CORE的致病机制中起重要作用,可能是基因治疗的重要靶位之一.

Effects on HepG2 cells growth of the different domains of genotype 1b hepatitis C virus core proteins

Objective To study the function of core protein (CORE) of genotype 1b hepatitis C virus (HCV) of different strains (T: derived from tumor tissues; NT: derived from non-tumor tissues; C191: HCV-J6) and different domains (1-172, 1-126, 1-58, 59-126, 127-172 AA) of T CORE in the pathogenesis of HCV infection and to find the therapy target. Methods Different truncated genotype 1b HCV CORE eukaryotic expression plasmids (T, NT, C191) and different domains of T CORE were constructed and transfected to HepG2 cells. Cell apoptosis and necrosis were quantified by flow cytometry. Cell growth curves were observed with real time cell growth instrument. Results COREs from different strains of genotype 1b and different domains of CORE induced cell apoptosis and necrosis, and inhibited HepG2 cell growth at different levels. CORE derived from T induced apoptosis and necrosis and inhibited cell growth higher than that derived NT and C191. N terminal 1-58 AA of CORE derived from T induced cell apoptosis and necrosis and inhibited cell growth higher than any other domains. Conclusion COREs from different strains of genotype 1b HCV and different domains of CORE from the same HCV strain play different roles in their molecular pathogenesis of HCV. Among different domains of CORE, N terminal 1-58 AA might play an important role in its pathogenesis and be one target of gene therapy.