title: Helper and suppressor functions of panned populations of immune peritoneal T cells with reactivity to the rat mammary adenocarcinoma 13762A.
abstract: The phenotype of glass-adherence-depleted tumor-immune peritoneal exudate lymphocytes (PEL) which generated anti-tumor reactivity against the rat mammary adenocarcinoma 13762A in vitro was examined by indirect panning. Monoclonal antibodies W3/25 and OX8, directed against the CD4 and CD8 differentiation antigens, respectively, were used to separate immune PEL into subsets of functionally different T cells. The panned populations of immune PEL were examined for anti-tumor reactivity in three different in vitro assays. Tumor-specific proliferation, tumor-specific induction of the helper lymphokine interleukin 2 (IL-2), and tumor-specific induction of an antiproliferative tumor-induced suppressor lymphokine (TISL) were determined. Panning experiments together with indirect immunofluorescence analysis of unpanned immune PEL indirectly indicated that a proportion of cells (15-20%) coexpressed CD4 and CD8 antigens. Strong tumor-specific proliferation and IL-2 and TISL production were generated from these double-positive cells, as determined by double-panning experiments. Significant tumor-specific proliferation and IL-2 production were produced also from CD4+CD8- cells, but TISL production was minimal, and could be accounted for by contaminating CD4+CD8+ cells. CD4-CD8+ cells produced negligible responses against the tumors as measured by these three assays, and no synergistic responses were demonstrated when CD4-CD8+ cells were incubated together with CD4+CD8- cells. These data demonstrated that CD4+CD8+ T cells exist in primed populations of rat peripheral lymphocytes, and that both helper and suppressor functions were generated from these double-positive cells.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000502:physiology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis; D002469:Cell Separation; D000939:Epitopes / Q000276:immunology; D005260:Female; D005455:Fluorescent Antibody Technique; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D007959:Lymphocyte Culture Test, Mixed; D008222:Lymphokines / Q000096:biosynthesis; D008325:Mammary Neoplasms, Experimental / Q000276:immunology*; D010529:Peritoneal Cavity / Q000166:cytology; D010641:Phenotype; D051381:Rats; D011916:Rats, Inbred F344; D006377:T-Lymphocytes, Helper-Inducer / Q000145:classification* / Q000276:immunology / Q000378:metabolism; D050378:T-Lymphocytes, Regulatory / Q000145:classification* / Q000276:immunology / Q000378:metabolism
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000939:Epitopes; D007376:Interleukin-2; D008222:Lymphokines