title: Cross-clade CD8 T-cell responses to HIV(IIIB) and Chinese B' and C/B' viruses in North American and Chinese HIV-seropositive donors.
abstract: HIV variation presents an obstacle to a global AIDS vaccine. Viral diversity and host variations in MHC expression both affect vaccine responses. Whether CD8 T cells from HIV-infected donors in 1 part of the world cross-recognize isolates from other regions will provide guidance about whether country-specific vaccines are needed. We compared recognition of HIV(IIIB) and representative B' (Thai B) and recombinant C/B' virus strains endemic in China by CD8 T cells from 7 HIV-infected North American donors and 4 Chinese donors. IFN-gamma production in response to HIV(IIIB) or the Chinese viruses was comparable. Although 1.6 +/- 0.8% of American donor CD8 T cells produced IFN-gamma above the background level in response to IIIB virus, 1.5 +/- 0.8% responded to B' virus, and 1.4 +/- 0.7% responded to C/B' virus. Responses to adherent cells infected with vaccinia viruses expressing B' and C/B' virus gag and env were also comparable in magnitude with responses to IIIB virus. Cytolysis of CD4 T cells infected with B' virus was comparable with lysis of cells infected with IIIB virus, but lysis of the more divergent C/B' virus was somewhat reduced. T cells, selected for IFN-gamma production to IIIB virus, also efficiently lysed cells infected with Chinese viruses. Therefore, cross-clade CD8 T-cell responses to IIIB virus and prevalent Chinese viral strains are common.
authors.affiliation: CBR Institute for Biomedical Research, Boston, Massachusetts 02115, USA.
authors.forename: Vanessa
authors.initials: V
authors.lastname: François-Bongarcon
authors.forename: Yi
authors.initials: Y
authors.lastname: Feng
authors.forename: Sang-Kyung
authors.initials: SK
authors.lastname: Lee
authors.forename: Gang
authors.initials: G
authors.lastname: Chen
authors.forename: Premlata
authors.initials: P
authors.lastname: Shankar
authors.forename: Ying
authors.initials: Y
authors.lastname: Liu
authors.forename: Xin
authors.initials: X
authors.lastname: Tao
authors.forename: Yiming
authors.initials: Y
authors.lastname: Shao
authors.forename: Judy
authors.initials: J
authors.lastname: Lieberman
mesh_terms: D016915:AIDS Vaccines / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000821:virology; D002478:Cells, Cultured; D002681:China; D003429:Cross Reactions; D005814:Genes, Viral; D006678:HIV / Q000235:genetics / Q000276:immunology*; D015488:HIV Antigens / Q000276:immunology; D006679:HIV Seropositivity / Q000175:diagnosis / Q000276:immunology*; D006801:Humans; D007371:Interferon-gamma / Q000096:biosynthesis*; D008264:Macrophages / Q000821:virology; D009656:North America; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014616:Vaccinia virus / Q000235:genetics
chemical_list: D016915:AIDS Vaccines; D015488:HIV Antigens; D007371:Interferon-gamma