中文摘要：

细胞角蛋白8（KRT-8）水平在丙型肝炎病毒（HCV）感染引起的肝癌患者体内及在HCV感染细胞培养中均明显上升,与肝病进展密切相关,但KRT-8是否对HCV复制产生影响并不清楚。本文利用KRT-8高表达质粒和特异性sh RNA分析其在细胞培养中对HCV复制的影响,并分析低沉默KRT-8后与已知抗HCV药物联合抑制HCV的作用及其对常见HCV耐药突变株的影响。结果显示,胞内KRT-8水平随HCV复制的增加而增加,其高表达能促进HCV的复制,而特异性干扰KRT-8基因表达后,HCV的复制受到抑制。低沉默KRT-8可以增强已知抗HCV药物特拉匹韦抑制HCV复制的作用,且对蛋白酶抑制剂常见耐药突变（A156T和D168V）HCV也具有抑制作用。这提示KRT-8可能是HCV复制的辅助因子,下调KRT-8具有抗HCV的作用及优势。因此,KRT-8有望成为抗HCV药物研发的一个新的宿主靶点。

英文摘要：

The level of intracellular keratin 8（KRT-8） is associated with liver diseases, whose expression is increased in hepatitis C virus（HCV）-infected patients with hepatocarcinoma and in cultural cells infected with HCV. However, it is not clear whether KRT-8 will impact HCV replication. In this paper, the HCV replication was analyzed in response to high expression and silence of KRT-8. The inhibitory activities against wild-type and mutant HCV were also analyzed by silence of KRT-8 or combined with known anti-HCV drug telaprevir. Results showed that the protein level of KRT-8 was increased in proportion with the HCV replication. The high expression was found to facilitate HCV replication, while the silence of KRT-8 was able to inhibit HCV replication and enhanced the anti-HCV activity of telaprevir. It also inhibited A156 T and D168 V mutant HCV, which are resistant to protease inhibitors. These results suggest that KRT-8 is a co-factor for HCV replication. Down-regulation of KRT-8 can inhibit wild type and mutant HCV replication to enhance the anti-HCV activity of known anti-HCV drugs. Therefore, KRT-8 may be a new target in the development of anti-HCV agents.