丙型肝炎病毒1b型NS3区与原发性肝癌的关系

目的：探讨丙型肝炎病毒（HCV）1b型的非结构蛋白3（NS3）区与原发性肝癌（HCC）的关系。方法：将患者分为丙型肝炎病毒携带者组、非HCC组及HCC组，从患者血清中提取HCV-RNA，采用巢式聚合酶链法（nested -PCR）进行HCV基因分型并扩增HCV-NS3片段，分析HCV-NS3区片段的核苷酸序列、氨基酸序列、蛋白质二级结构。结果：3组均以1b型为主，3组间1b型所占百分率比较差异无显著性(P>0.05）；3组核苷酸序列同源性95%，3组氨基酸序列的同源性为95%，且3组在NS3_1227-1206区间都无特殊的氨基酸突变；NS3_1227-1206区的蛋白质二级结构分为A、B 2型，携带组及非HCC组以A型为主，而HCC组以B型为主；携带组与非HCC组蛋白质二级结构分型差异无显著性（P>0.05），而HCC组与携带组、非HCC组之间差异有显著性（P<0.01）。结论：1b型HCV携带者及非HCC患者与HCC患者在蛋白质二级结构上有差异，HCV-NS3与HCC的发生有关联。

Correlation between nonstructural protein 3 of chronic genotype 1b hepatitis C virus and development of hepatocellular carcinoma

Objective To investigate the correlation between the nonstructural protein 3(NS3)of chronic genotype 1b hepatitis C virus(HCV) and development of hepatocellular carcinoma(HCC).Methods The sera were collected from HCV-carriers and HCV-infected Chinese patients with and without HCC,HCV-RNA extracted from these serum samples were amplified by nested polymerase chain reaction(nested-PCR) to obtain the genotype 1b and NS3 region PCR products,GENETYX-Mac ver 10.1 software was used to analysis the nucleotide sequence,amino acid sequence and the secondary structure of NS31027-1206.Results The genotype 1b became predominant in all the patients,and the percentage had no statistically significant difference(P>0.05).The homology of nucleotide and amino acid sequence was 95%,there was no particular mutation in the NS31027-1206 region amino acid sequence.On the basis of secondary structure of NS31027-1206,the HCV isolates were classified into two types:type A and type B;type A was predominant in the carriers and non-HCC patients,type B was predominant in the HCC patients.The difference in the distribution pattern of those types between carriers and non-HCC patients was no statistically significant(P>0.05),but was statistically significant(P<0.01)between carriers,non-HCC patients and HCC patients.Conclusion There is difference in the secondary structure of NS31027-1206 of carriers,non-HCC and HCC patients,and HCV-NS3 has correlation with the development of HCC.