title: HTLV-I-infected T cells activate autologous CD4+ T cells susceptible to HTLV-I infection in a costimulatory molecule-dependent fashion.
abstract: A vigorous production of human T lymphotropic virus type I (HTLV-I)-infected CD4+ T cells is closely associated with the development of adult T cell leukemia (ATL) and neurological disease. However, the immunological mechanisms leading to generation of the HTLV-I-infected cells are not fully clarified. The modulation of CD80 and CD86 expression on the HTLV-I-infected cells and its physiological role in the interaction of infected CD4+ T cells with uninfected CD4+ T cells was examined. The HTLV-I-infected CD4+ T cell lines established from ATL patients and normal donors by infecting their CD4+ T cells with the virus expressed CD80, CD86, and HLA-DR, and induced a proliferation of autologous and allogenic CD4+ T cells. While the CD4+ T cells stimulated with the autologous HTLV-I-infected cells for 7 days expressed CD80 and CD86 but not HTLV-I gene products, they expressed HTLV-I gag antigen after 4 weeks. The interaction of HTLV-I-infected and -uninfected CD4+ T cells was profoundly suppressed by a combination of CD80 and CD86 monoclonal antibodies. These results suggest that the induction of CD80 and CD86 on HTLV-I-infected CD4+ T cells participates actively in the generation of the virus-infected progenitor cells.
authors.affiliation: Department of Virology, Faculty of Medicine, Kagoshima University, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Takamoto
authors.forename: M
authors.initials: M
authors.lastname: Makino
authors.forename: M
authors.initials: M
authors.lastname: Azuma
authors.forename: T
authors.initials: T
authors.lastname: Kanzaki
authors.forename: M
authors.initials: M
authors.lastname: Baba
authors.forename: S
authors.initials: S
authors.lastname: Sonoda
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD / Q000502:physiology; D018122:B7-1 Antigen / Q000502:physiology; D051940:B7-2 Antigen; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000382:microbiology*; D004198:Disease Susceptibility; D015490:HTLV-I Infections / Q000276:immunology* / Q000821:virology*; D015368:Human T-lymphotropic virus 1 / Q000276:immunology*; D006801:Humans; D016130:Immunophenotyping; D007166:Immunosuppressive Agents / Q000494:pharmacology; D015458:Leukemia, T-Cell / Q000276:immunology / Q000821:virology; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008562:Membrane Glycoproteins / Q000502:physiology
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D018122:B7-1 Antigen; D051940:B7-2 Antigen; C497964:CD86 protein, human; D007166:Immunosuppressive Agents; D008562:Membrane Glycoproteins