基因1b型HCV不同截短片段核心蛋白在HepG2亚细胞器中的定位表达

Subcellular localization of different truncated core protein of genotype lb hepatitis C virus in HepG2 cell

目的为进一步探讨HCV核心蛋白（CORE）在HCV致病机制中的作用，观察基因1b型不同截短片段CORE在瞬时转染HepG2细胞中亚细胞器的分布状况。方法将含有增强型绿荧光蛋白（EGFP）的3个基因1b型不同准种HCV和同一准种5个不同截短片段的CORE融合蛋白真核表达质粒pEGFF-CORE，瞬时转染HepG2细胞，用荧光显微镜及激光共聚焦观察它们在亚细胞的分布状况。结果基因1b型不同准种CORE的N端1-172氨基酸（aa）主要表达于胞质，含有N端越长表达于胞质内越多，而N端1-58aa主要表达于核内，而59-126aa及127-172aa胞质和核内均有表达。结论不同区段CORE在细胞内亚细胞器的表达部位不同，与其在致病机制中功能的发挥可能存在一定的关系。

Objective To study the pathogenesis mechanism of hepatitis C virus （HCV） core protein （CORE）, the subcellular localization of different truncated genotype lb HCV CORE was observed. Methods HepG2 cells were transiently transfected with the enhanced green fluorescence protein （EGFP-CORE） recombinant plasmids, which expresses EGFP and COREs from three different genotype lb HCV strains and different truncated COREs from one HCV strain. The localizations of different truncated COREs was analyzed by the laser scanning confocal microscope and fluorescence microscope. Results N terminal 1-172 aa of different HCV strains of genotype lb expressed mainly in cytoplasm. Among the different truncated COREs, the longer of the CORE containing N terminal, the more expressed in cytoplasm. The N terminal 1-58 aa mainly expressed in nucleus. CORE of 59-126 aa and 127-172 aa expressed both in cytoplasm and nucleus. Conclusion The different localizations of different truncated COREs might have some relationships with their functions in pathogenesis.