恒河猴实验感染庚型肝炎病毒的实验研究

Study on the experimental infection of hepatitis G virus in rhesus monkey

目的研究庚型肝炎病毒（ＨＧＶ）在恒河猴中的实验感染状态。方法用一名ＨＧＶＲＮＡ阳性、ＨＢＶ、ＨＣＶ均阴性的健康献血员血浆实验感染２只恒河猴，并取第一代猴感染后６周的血再感染１只第二代恒河猴，然后用以第二代猴感染６周后血继续感染２只第三代恒河猴。分别用逆转录聚合酶链反应（ＲＴ－ｎＰＣＲ）检测受感染猴血清中的ＨＧＶＲＮＡ，并每周抽血测定血清中丙氨酸转氨酶（ＡＬＴ）。结果感染１周后猴血清ＨＧＶＲＮＡ阳转，最长持续阳性２８周以上。不同感染个体血清ＡＬＴ水平有明显差异，其中１号猴有短期轻度升高，５号猴血清ＡＬＴ较长时间在１００Ｕ／Ｌ以上。肝活检发现，感染后１６周猴肝组织出现明显的病毒性肝炎样病理改变。进一步对该献血员血浆和感染后猴血清中的ＨＧＶ５’端部分非编码区基因ＰＣＲ产物进行测序，结果显示感染用献血员血浆和猴血清中ＨＧＶ序列与国外株ＨＧＵ４４４０２的同源性分别为９８３３％和９５８３％；与ＨＧＵ３６３８０株的同源性分别为９２５０％和８９１７％；感染猴血清中ＨＧＶ序列与献血员ＨＧＶ序列同源性为９５８３％。结论恒河猴对ＨＧＶ敏感。

In order to study the experimental infection of HGV in rhesus monkey, the monkeys were infected using the plasma from a donor with HGV RNA positive. The second generation monkeys were infected with the sera of the first generation monkeys infected after 6 weeks, and also the third generation monkeys were infected with the sera of the second generation monkeys. HGV RNA were detected by RT-nPCR. The results showed that in sera of infected monkeys HGV RNA were positive after 1 week of inoculation, and were consecutively positive for up to 28 weeks at longest. The level of ALT raised a little in monkey No.1 and higher than 100U/L in No.5. The liver biopsy showed viral hepatitis-like histological changes. Comparing the sequence of HGV 5'LTR from sera of the infected monkeys and the blood donor, the homogeneity, to strain HGU44402 was 98 33% and 95 83% to strain HGU36380 was 92 50% and 89 17%, respectively. The results suggested that the rhesus monkey is sensitive to HGV and is suitable for establishment of an animal model.