title: Cooperation between helper T cells and cytotoxic T lymphocyte precursors.
abstract: We have investigated the requirement for the presence of L3T4-positive T cells in the in vivo priming of Lyt-2-positive cytotoxic T-lymphocyte precursors. The antigens used were the male-specific antigen H-Y and autosomal minor histocompatibility antigens. In some experiments, responder mice were depleted of L3T4-positive cells by repeated intraperitoneal injections of the anti-L3T4 antibody, GK1.5. In other experiments, lymphoid cells from normal mice were fractionated in vitro by antibody-plus-complement treatment and the populations primed in irradiated adoptive hosts. In these antigen systems, depletion of L3T4-positive helper cells decreases the level of priming of cytotoxic T lymphocytes. With regeneration of the L3T4-positive subpopulation, the CTL response to antigen increases. To some extent, the reliance on L3T4-positive cells can be overcome by increasing the antigen dose. We conclude that in most physiological responses, L3T4-positive T cells enhance the cytotoxic T-cell response.
authors.affiliation: Department of Immunology, Research Institute of Scripps Clinic, La Jolla, California 92037.
authors.forename: L A
authors.initials: LA
authors.lastname: Husmann
authors.forename: M J
authors.initials: MJ
authors.lastname: Bevan
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D007116:Immunization, Passive; D007700:Kinetics; D008198:Lymph Nodes / Q000276:immunology; D007959:Lymphocyte Culture Test, Mixed; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D051381:Rats; D013154:Spleen / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte