title: A chemical carcinogen, 3-methylcholanthrene, alters T-cell function and induces T-suppressor cells in a mouse model system.
abstract: The in-vivo effects of a polycyclic aromatic hydrocarbon (PAH), 3-methylcholanthrene (MCA), on in-vitro mitogen activation, cell-mediated lympholysis (CML) and T-cell subset distribution in mouse splenic lymphocyte populations were measured. Three inbred mouse strains were treated with a single intraperitoneal injection of corn oil alone or with different doses of MCA in oil (0.5-50 mg kg -1). One to ninety days after injection, splenic lymphocytes were isolated, and assayed for blastogenesis, CML and the percent T-helper and T-suppressor cells using monoclonal antibodies. High doses of MCA suppressed mitogen activation (15.2-53.6%) and CML (69-90%) within 24 hr in lymphocytes from PAH-responsive mice (C57 and C3H). Blastogenesis was stimulated and CML was suppressed to a lesser degree (5-45%) in lymphocytes from non-responsive mice (DBA). MCA induced an increase in T-suppressor cells in responsive mice, but there was no change in DBA mice. These studies suggest a correlation between immunocytotoxicity of PAH compounds on T-cell subsets and the responsiveness of mouse strains to these carcinogens.
mesh_terms: D000818:Animals; D003602:Cytotoxicity, Immunologic; D007376:Interleukin-2 / Q000276:immunology; D007518:Isoantibodies / Q000276:immunology; D008213:Lymphocyte Activation / Q000187:drug effects; D008748:Methylcholanthrene / Q000494:pharmacology*; D051379:Mice; D008815:Mice, Inbred Strains; D013601:T-Lymphocytes / Q000187:drug effects*; D013602:T-Lymphocytes, Cytotoxic / Q000187:drug effects; D006377:T-Lymphocytes, Helper-Inducer / Q000187:drug effects; D050378:T-Lymphocytes, Regulatory / Q000187:drug effects*
chemical_list: D007376:Interleukin-2; D007518:Isoantibodies; C029805:Lyt antibodies; D008748:Methylcholanthrene