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- W2153759980 abstract "Chronic hepatitis B virus infection is associated with a high risk of developing into hepatocellular carcinoma, while tumor recognition is important during the immune surveillance process that prevents cancer development in humans. The mechanisms of immune evasion and the role of the early immune response in chronic infection caused by hepatitis B virus (HBV) are still unclear. In the present study, 1 copy or 1.2 copies of HBV genome was transfected into a hepatocellular carcinoma cell line BEL7405. RT-PCR, Western blot and flow cytometry analysis were used to evaluate the expression of HLA class I molecules and transporter associated with antigen processing 1 (TAP1). Finally, the cytotoxic activity of natural killer (NK) cells against HBV transfected liver cells was detected by MTT colorimetry method. Following transfection of 1 copy or 1.2 copies of HBV genome, HLA class I expression was up-regulated in BEL7405 cell line in a dose-dependent manner. Furthermore, increased the surface HLA class I expression were caused by enhanced expression of TAP1 at mRNA and protein levels in those transfected cells. Consequently, a significantly down-regulated cytotoxic activity of NK cells against HBV transfected liver cells was observed. These results may demonstrate a way by which HBV avoids recognition by NK cells that might be associated with the establishment of chronic infection and tumor formation." @default.
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- W2153759980 date "2010-01-01" @default.
- W2153759980 modified "2023-09-28" @default.
- W2153759980 title "Up-regulate HLA Class I Expression Following Hepatitis B Virus Transfection in a Hepatocellular Carcinoma Cell Line BEL7405" @default.
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- W2153759980 doi "https://doi.org/10.3109/08820131003792826" @default.
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