title: Tumor eradication by hepatitis B virus X antigen-specific CD8+ T cells in xenografted nude mice.
abstract: We have previously reported several CTL epitopes derived from the hepatitis B viral X Ag (HBx). In this study, we evaluated whether HBx-specific CTLs can be effectively used in adoptive cancer immunotherapy. To validate the possibility, four peptides containing a HLA-A2.1-restricted binding consensus motif were identified from the HBx protein and tested for their ability to activate CTL from PBMCs isolated from chronic carriers of HBV (n = 12). We selected two highly potent epitopes, HBx 52-60 (HLSLRGLFV) and HBx 115-123 (CLFKDWEEL), that are capable of inducing Ag-specific cytotoxic T cells in patient PBMCs. For adoptive immunotherapy using HBx-specific CTLs, we generated CTL clones restricted to the HBx 52-60 or HBx 115-123 peptide using a limiting dilution technique. LC-46, an HBx 52-60-specific clone, is CD62L(-)CD69(+)CD45RO(+)CD45RA(-)CD25(dim) and is stained by IFN-gamma (approximately 92%), IL-2 (30%), and TNF-alpha (56%), but not by IL-5, IL-10, IL-12, or TNF-beta, indicating that the cells are fully activated T cytotoxic 1-type cells. When LC-46 cells were adoptively transferred into xenografted nude mice bearing human hepatomas expressing HLA-A2.1 molecules and intracellular HBx proteins, the tumors were eradicated. Taken together, our data provide solid evidence for the feasibility of adoptive immunotherapy with HBx-sensitized CTLs in hepatitis disease, including hepatocellular carcinoma (HCC).
authors.affiliation: Division of Virology and Immunology, Mogam Biotech. Institute, Koosung-myun, Yongin-city Kyonggi-do, South Korea.
authors.forename: Eunyoung
authors.initials: E
authors.lastname: Chun
authors.forename: Jihyun
authors.initials: J
authors.lastname: Lee
authors.forename: Hong Seok
authors.initials: HS
authors.lastname: Cheong
authors.forename: Ki-Young
authors.initials: KY
authors.lastname: Lee
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D006528:Carcinoma, Hepatocellular / Q000276:immunology / Q000628:therapy; D002353:Carrier State / Q000276:immunology; D002460:Cell Line; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic; D018984:Epitopes, T-Lymphocyte / Q000008:administration & dosage / Q000276:immunology* / Q000378:metabolism; D015789:HLA-A2 Antigen / Q000032:analysis / Q000378:metabolism; D006511:Hepatitis B Antigens / Q000008:administration & dosage / Q000276:immunology*; D006515:Hepatitis B virus / Q000276:immunology*; D019694:Hepatitis B, Chronic / Q000276:immunology; D006801:Humans; D016130:Immunophenotyping; D016219:Immunotherapy, Adoptive / Q000379:methods*; D051379:Mice; D008810:Mice, Inbred C57BL; D008819:Mice, Nude; D010446:Peptide Fragments / Q000276:immunology / Q000378:metabolism; D011485:Protein Binding / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000378:metabolism / Q000637:transplantation; D015534:Trans-Activators / Q000008:administration & dosage / Q000276:immunology*; D014183:Transplantation, Heterologous / Q000276:immunology*; D014407:Tumor Cells, Cultured; D054334:Viral Regulatory and Accessory Proteins
chemical_list: D018984:Epitopes, T-Lymphocyte; D015789:HLA-A2 Antigen; D006511:Hepatitis B Antigens; D010446:Peptide Fragments; D015534:Trans-Activators; D054334:Viral Regulatory and Accessory Proteins; C057628:hepatitis B virus X protein