title: In vitro susceptibility of Thai seronegative donor CD8+ T lymphocytes to human immunodeficiency virus-1 (HIV-1) infection.
abstract: To determine whether CD8+ T lymphocytes from Thai donor cells are susceptible to HIV-1 infection, undepleted peripheral blood mononuclear cells (PBMC) and CD8-enriched PBMC were infected with HIV-1 Thai subtype B and CRF01_AE (E) primary isolates. Virus kinetics in HIV-1 infection of CD4+ and CD8+ T lymphocytes peaked at day 7 or 10 post infection (pi); the TCID50 used for cell infection was proportional to the level of p24 production in the cultures. We also found that the level of p24 antigen in the supernatants of infected undepleted PBMC was significantly higher than that of infected CD8-enriched PBMC. Interestingly, both single positive T lymphocytes (CD4+ and CD8+ T lymphocytes) as well as double positive CD4+/CD8+ T lymphocytes were infected with HIV-1. The double positive T lymphocytes in PBMC were found only in the presence of both CD4+ and CD8+ T lymphocytes. The majority of p24+/CD4-/CD8- T lymphocytes were HIV-1 infected CD4 down-modulated PBMC. This report provides direct evidence that single positive CD8+ T lymphocytes and double positive CD4+/ CD8+ T lymphocytes from Thai donors can be infected with HIV-1 subtypes B and E in vitro.
authors.affiliation: Center of Excellence for Flow Cytometry, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand.
authors.forename: Ronnarit
authors.initials: R
authors.lastname: Haponsaph
authors.forename: Janice M
authors.initials: JM
authors.lastname: Darden
authors.forename: Somsak
authors.initials: S
authors.lastname: Chantakulkij
authors.forename: Nongluck
authors.initials: N
authors.lastname: Sannoi
authors.forename: Mark S
authors.initials: MS
authors.lastname: de Souza
authors.forename: Arthur E
authors.initials: AE
authors.lastname: Brown
authors.forename: Deborah L
authors.initials: DL
authors.lastname: Birx
authors.forename: Victoria R
authors.initials: VR
authors.lastname: Polonis
authors.forename: Kovit
authors.initials: K
authors.lastname: Pattanapanyasat
mesh_terms: D015496:CD4-Positive T-Lymphocytes / Q000821:virology; D018414:CD8-Positive T-Lymphocytes / Q000821:virology*; D016655:HIV Core Protein p24 / Q000276:immunology; D015658:HIV Infections / Q000276:immunology*; D018023:HIV Seronegativity / Q000276:immunology; D015497:HIV-1 / Q000276:immunology / Q000472:pathogenicity*; D006801:Humans; D066298:In Vitro Techniques; D013785:Thailand
chemical_list: D016655:HIV Core Protein p24