title: Characterization of lymphocytes which inhibit proliferation of human T cells exposed to lymphocyte-derived mitogenic factors.
abstract: Culture supernatants of PHA-activated human lymphocytes (active SUPs) contain factors which are strongly mitogenic for fractionated peripheral T cells. This stimulation is suppressed by certain non-T lymphocytes. It is shown that these suppressor cells can inhibit an ongoing response of T cells to active SUP and that this inhibition is reversible. Using various rosette sedimentation techniques for fractionating subpopulations of lymphocytes it is concluded that the suppressor cells lack membrane-associated receptors for C3 but possess receptors for the Fc part of IgG. This subset of lymphocytes may be an important regulator of lymphocyte proliferation during immune responses.
mesh_terms: D000328:Adult; D000818:Animals; D002478:Cells, Cultured; D004247:DNA / Q000096:biosynthesis; D005260:Female; D006801:Humans; D007141:Immunoglobulin Fc Fragments; D007376:Interleukin-2 / Q000494:pharmacology*; D008213:Lymphocyte Activation; D008214:Lymphocytes / Q000276:immunology*; D008222:Lymphokines / Q000494:pharmacology*; D008297:Male; D009000:Monocytes / Q000276:immunology; D012397:Rosette Formation; D012756:Sheep; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D007141:Immunoglobulin Fc Fragments; D007376:Interleukin-2; D008222:Lymphokines; D004247:DNA