title: Differences among mononuclear cell subpopulations in HIV seropositive or seronegative homosexual and heterosexual men as determined by four-color flow cytometry.
abstract: Four-color cell surface immunofluorescence and flow cytometry analysis was used to quantitate mononuclear cell subpopulations from HIV seropositive (HIV+) and seronegative (HIV-) homosexual men and heterosexual men. HIV+ men were divided into two groups based on peripheral blood CD4/mm3 of greater than 500 or less than 500. CD4+ cells that were simultaneously CD45R-, CDw29-, and 13- were significantly less in HIV+ men with less than 500 CD4/mm3 (17%) compared to heterosexual men (34%). This lower percentage of "CD4 only" cells in HIV+ males with less than 500 CD4/mm3 correlated with a significantly higher percentage of CD4+ cells that were CD45R+, CDw29+, and 13+ in these individuals. CD8+ cells that were CD45R+, 13+, but CD38-, were significantly less in HIV+ men with less than 500 CD4 as compared to HIV- homosexual men. In contrast, a second CD8+ subpopulation that was CD45R-, CD38+, and either 13+ or 13- was significantly greater in less than 500 HIV+ men as compared to both HIV- homosexual men and heterosexual men. A significant difference in this subpopulation was observed between the less than 500 and greater than 500 HIV+ groups and correlated with seropositivity for viral p24 antigen. Interestingly, CD8+ cells that were CD45R+, as well as CD38+, and either 13+ or 13- were significantly greater in the less than 500 HIV+ group compared to the greater than 500 HIV+ group, and did not correlate with p24 seropositivity. The percentage of monocyte/macrophages that were CD4- or expressed dim CD4 immunofluorescence, but were 13+, was significantly greater in HIV+ men (43%) compared to HIV- homosexual men (27%). In summary, we have identified previously undescribed mononuclear cell subpopulations that were altered with HIV infection and, in some cases, correlated with the stage of disease.
authors: Department of Medicine, Indiana University School of Medicine, Indianapolis 46202.
authors: C T
authors: CT
authors: Schnizlein-Bick
authors: M R
authors: MR
authors: Magier
authors: R B
authors: RB
authors: Jones
authors: K H
authors: KH
authors: Fife
authors: B P
authors: BP
authors: Katz
authors: E B
authors: EB
authors: Walker
mesh_terms: D036541:ADP-ribosyl Cyclase; D051997:ADP-ribosyl Cyclase 1; D000328:Adult; D015703:Antigens, CD / Q000032:analysis*; D000943:Antigens, Differentiation / Q000032:analysis; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D015704:CD4 Antigens / Q000032:analysis; D016827:CD8 Antigens; D002469:Cell Separation; D005434:Flow Cytometry; D005455:Fluorescent Antibody Technique; D006679:HIV Seropositivity / Q000097:blood*; D000949:Histocompatibility Antigens Class II / Q000032:analysis; D006716:Homosexuality; D006801:Humans; D017493:Leukocyte Common Antigens; D007963:Leukocytes, Mononuclear / Q000276:immunology*; D008297:Male; D008562:Membrane Glycoproteins; D008875:Middle Aged; D012725:Sexual Behavior
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D000945:Antigens, Differentiation, T-Lymphocyte; D015704:CD4 Antigens; D016827:CD8 Antigens; D000949:Histocompatibility Antigens Class II; D008562:Membrane Glycoproteins; D017493:Leukocyte Common Antigens; D036541:ADP-ribosyl Cyclase; C498154:CD38 protein, human; D051997:ADP-ribosyl Cyclase 1