title: Expression of costimulatory molecule CD28 on T cells in human immunodeficiency virus type 1 infection: functional and clinical correlations.
abstract: To study the functional integrity of T cells from human immunodeficiency virus type 1 (HIV-1)-infected persons, CD4+ and CD8+ cells were examined for proliferation and secretion of interleukin-2 (IL-2) in response to staphylococcal superantigens and antibodies to CD3 and the alpha beta T cell receptor. A functional defect within CD8+ but not within CD4+ cells from HIV-1-infected persons was observed. Within CD8+ cells, proliferation and secretion of IL-2 was restricted to cells expressing the costimulatory molecule CD28. Such cells were proportionally reduced in HIV-1-infected persons. In patients with advanced immunodeficiency, however, evidence of functional derangement was found also within the CD28+ CD8+ cells. In a cross-sectional study of 73 HIV-infected persons and 15 controls, a significant correlation was observed between the number of CD28+ CD8+ cells and the presence of HIV-related disease. Our results suggest that regulation of expression of CD28 may play an important role in the immunopathogenesis of AIDS.
authors.affiliation: Institute of Transplantation Immunology, National Hospital, Oslo, Norway.
authors.forename: J E
authors.initials: JE
authors.lastname: Brinchmann
authors.forename: J H
authors.initials: JH
authors.lastname: Dobloug
authors.forename: B H
authors.initials: BH
authors.lastname: Heger
authors.forename: L L
authors.initials: LL
authors.lastname: Haaheim
authors.forename: M
authors.initials: M
authors.lastname: Sannes
authors.forename: T
authors.initials: T
authors.lastname: Egeland
mesh_terms: D018106:CD28 Antigens / Q000096:biosynthesis*; D015704:CD4 Antigens / Q000032:analysis; D016516:CD4-CD8 Ratio; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D016827:CD8 Antigens / Q000032:analysis; D016022:Case-Control Studies; D003430:Cross-Sectional Studies; D005434:Flow Cytometry; D015658:HIV Infections / Q000276:immunology*; D015497:HIV-1; D006801:Humans; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D013601:T-Lymphocytes / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology
chemical_list: D018106:CD28 Antigens; D015704:CD4 Antigens; D016827:CD8 Antigens; D007376:Interleukin-2