title: Regulatory interactions between macrophages and T-cell subsets in Listeria monocytogenes-specific T-cell activation.
abstract: Peritoneal exudate T lymphocytes from Listeria monocytogenes-immune mice in the presence of the homologous antigen (heat-killed L. monocytogenes) and normal macrophages showed L. monocytogenes-specific proliferative responses. Proliferation was inhibited by macrophages from L. monocytogenes- or Corynebacterium parvum-pretreated mice as well as by exogenous prostaglandin E(2). Macrophage-dependent inhibition of T-cell proliferation-at least in part-could be reversed by addition of indomethacin. When selected L. monocytogenes-immune Lyt T-cell subsets were cultured in the presence of inhibitory macrophages, pretreatment with anti-Lyt 1 antiserum plus complement completely abrogated proliferation and pretreatment with anti-Lyt 2 and anti-Lyt 3 antisera plus complement markedly reduced proliferation. However, a mixture (1:1) of the two preselected Lyt T-cell subsets resulted in complete reconstitution of proliferative responses. In contrast, when L. monocytogenes-immune peritoneal exudate T lymphocytes were treated with anti-Lyt antisera plus complement after culture, only treatment with anti-Lyt 1 antiserum plus complement affected proliferation, suggesting regulatory interactions between Lyt 1(+)23(-) and Lyt 1(-)23(+) T cells during in vitro culture which result in proliferation within the Lyt 1(+)23(-) T-cell subset. After rigorous depletion of residual macrophages and in the presence of indomethacin, pretreatment with anti-Lyt 1 antiserum plus complement, but not with anti-Lyt 2 and 3 antisera plus complement, eliminated proliferation. The data presented indicate that interactions between macrophages and Lyt T-cell subsets regulate L. monocytogenes-specific T-cell activation.
mesh_terms: D000818:Animals; D000950:Antigens, Ly; D002478:Cells, Cultured; D003165:Complement System Proteins; D015232:Dinoprostone; D005260:Female; D007213:Indomethacin / Q000494:pharmacology; D007518:Isoantibodies; D008089:Listeria monocytogenes / Q000276:immunology*; D008213:Lymphocyte Activation; D008264:Macrophages / Q000276:immunology*; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D011425:Propionibacterium acnes / Q000276:immunology; D011458:Prostaglandins E / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000950:Antigens, Ly; D007518:Isoantibodies; C029805:Lyt antibodies; D011458:Prostaglandins E; D003165:Complement System Proteins; D015232:Dinoprostone; D007213:Indomethacin