title: A monoclonal antibody that identifies human peripheral blood monocytes recognizes the accessory- cells required for mitogen-induced T lymphocyte proliferation.
abstract: These studies were carried out to evaluate the functional characteristics of the cells identified by a monoclonal anti-human mononuclear phagocyte (M phi) antibody, 63D3. This antibody reacts specifically with all human peripheral blood M phi and not with normal human peripheral blood T or B cells. By using the fluorescence-activated cell sorter, human peripheral blood mononuclear cells (PBM) were sorted into 63D3-positive and 63D3-negative populations. Cell volume analysis indicated that 63D3-negative cells were identical to the non-adherent cells (NAC) in PBM, whereas 63D3-positive cells had a bimodal size distribution comparable to glass-adherent cells (AC). Neither 63D3-negative cells nor NAC were able to proliferate in response to mitogenic stimulation, whereas co-culture with either mitomycin C-treated AC or 63D3-positive cells restored mitogen responsiveness. Thus, the 63D3-positive population contains the relevant accessory cell required for mitogen-induced human lymphocyte proliferation.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology; D002469:Cell Separation; D002999:Clone Cells / Q000276:immunology; D006801:Humans; D007158:Immunologic Techniques; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008934:Mitogens / Q000494:pharmacology*; D009000:Monocytes / Q000276:immunology*; D010586:Phagocytes / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000906:Antibodies; D008934:Mitogens