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In this study, we show that CD4+, hepatitis B virus (HBV) envelope-specific T-cell clones produced by stimulation with a particulate antigen preparation are able to recognize and kill not only autologous antigen-presenting cells incubated with exogenous HBV envelope antigens but also autologous HLA class II-positive cells expressing endogenously synthesized HBV envelope antigens following infection with recombinant vaccinia viruses or transfection with recombinant Epstein-Barr virus expression vectors. Experiments with lysosomotropic agents and brefeldin A suggest that the endosomal compartment is likely involved in the processing of endogenously synthesized viral proteins for recognition by CD4+ T cells. Our study indicates that HBV envelope-specific, HLA class II-restricted CD4+ cytotoxic T lymphocytes can potentially participate in the immune clearance of HBV-infected cells and the pathogenesis of hepatocellular injury in hepatitis B.

journal of virology

Hepatitis B virus (HBV)-specific cytotoxic T-cell (CTL) response in humans: characterization of HLA class II-restricted CTLs that recognize endogenously synthesized HBV envelope antigens