庚型肝炎病毒基因组RNA的实验转染

目的：研究庚型肝炎病毒（HGV）对恒河猴的致病性及其在恒河猴体内的复制和表达。方法：体外转录制备全长HGV基因组RNA，肝内注射感染BY1猴，9个月后取其阳性血清感染BM1猴，7个月后取BM1阳性血清感染BB1。采用RT－PCR、原位杂交、定量PCR和免疫学、血清酶学、组织病理学等方法，对HGV的感染性及致病性进行了研究。结果：BY1、BM1和BB1实验猴感染后，分别在第3、8和3周血清HGV RNA阳转，持续存在最长达21周。血清丙氨酸转移酶（ALT）均升高，最高达418IU／L。感染后血清中均检测出抗－HGV。肝组织检查呈现轻度肝炎样变，并检测到HGV mRNA和HGV E2蛋白在肝组织中的表达。结论：体外转录的HGV基因组RNA对恒河猴具有感染性，可在恒河猴中传代感染并引起肝组织轻微炎症改变。恒河猴对HGV感染敏感，可作为研究HGV的实验动物模型。

Experimental transfection of hepatitis G virus genomic RNA

Objective To investigate pathogene city, replication and expression of hepatitis G virus (HGV) in rhesus monkey infected with HGV RNA genome or HGV RNA positive sera. Methods A full length cDNA clone of HGV was constructed. Rhesus monkey BY1 was inoculated intrahepatically with genomic RNA from this HGV clone resulted in viral replication. HGV RNA positive sera from BY1 were intravenously inoculated into rhesus monkeys BM1, and sera from BM1 were intravenously inoculated into BB1 in series. Sera were collected weekly or bi weekly and liver biopsies were performed regularly. RT PCR, in situ hybridization and immunological, serological, histological assays were carried out to study the infectivity and pathogenecity of HGV. Results The serological and pathological results indicated that all of the 3 rhesus monkeys developed HGV viremia and had slightly elevated alanine transaminase levels (up to 418 IU/ L) during the period of experiment. HGV RNA became positive at the 3 rd , 8 th and 3 rd week post inoculation in the animals BY1, BM1 and BB1 respectively, and existed up to 21 weeks. The histology, immunohistochemnistry, and in situ hybridization in the liver tissues of the inoculated animals also showed that there was a mild hepatitis with HGV E2 expression in cytoplasm of hepatocytes. RT PCR and quantitative PCR showed that HGV could replicate in liver.Conclusions The genomic RNA from HGV full length cDNA is infective to the rhesus monkeys resulting in mild hepatitis. Infection and the transmission of the HGV in the rhesus monkey provide an appropriate animal model for the study of HGV.