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Hepatitis B virus (HBV)-associated hepatocellular carcinoma (HCC) is mediated by an inappropriate attack by HBV-specific T cells in patients. However, this immunopathogenic process has not been clarified because of the lack of a suitable animal model. Here, we used immunocompetent Fah -/- mice as the recipients in the adoptive transfer of HBsAg + hepatocytes from HBs-Tg mice to replace the recipient hepatocytes (HBs-HepR). HBs-HepR mice exhibited persistent HBsAg expression with chronic hepatitis and eventually developed HCC with a prevalence of 100%. HBsAg-specific CD8 + T cells were generated and specifically and continuously induced hepatocyte apoptosis with progressive chronic inflammation, and the depletion of CD8 + T cells or their deficiency prevented HCC, which could then be reproduced by the transfer of HBsAg-specific CD8 + T cells. In summary, our results demonstrated that CD8 + T cells plays a critical role in HBsAg-driven inflammtion and HCC tumorigenesis.

HBsAg-specific CD8+ T cells as an indispensable trigger to induce murine hepatocellular carcinoma