title: T help requirements for the generation of an in vivo IgE response: a late acting form of T cell help other than IL-4 is required for IgE but not for IgG1 production.
abstract: To further define requirements for T cell help in the stimulation of an in vivo IgE response, we studied a system in which the injection of mice with a goat antibody to mouse IgD (GaMD) stimulates large polyclonal IgG1 and IgE responses. In this system, both responses are blocked by anti-CD4 antibody, but only the IgE response is blocked by (anti-IL-4) antibody. Anti-CD4 antibody, if injected 5 days after GaMD, was found to inhibit the GaMD-induced IgE response to a much greater extent than the IgG1 response, even though both responses occur simultaneously and are inhibited to an equal extent by optimal or suboptimal doses of anti-CD4 antibody administered 2 days after GaMD. Even a suboptimal, 50-micrograms dose of anti-CD4 antibody, when injected 5 days after GaMD, inhibited the IgE response to a much greater extent than did an optimal 10-mg dose of anti-IL-4 antibody injected at the same time, even though 10 mg of anti-IL-4 antibody more completely inhibited GaMD-induced IgE production than did 50 micrograms of anti-CD4 antibody when injected 2 days after GaMD. These observations provide evidence that a late acting form of T cell help other than IL-4 is important for the generation of an IgE response but not an IgG1 response in GaMD-immunized mice.
authors.affiliation: Department of Medicine, Uniformed Services, University of the Health Sciences, Bethesda, MD 20814.
authors.forename: F D
authors.initials: FD
authors.lastname: Finkelman
authors.forename: J
authors.initials: J
authors.lastname: Holmes
authors.forename: J F
authors.initials: JF
authors.lastname: Urban
authors.forename: W E
authors.initials: WE
authors.lastname: Paul
authors.forename: I M
authors.initials: IM
authors.lastname: Katona
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000008:administration & dosage; D000945:Antigens, Differentiation, T-Lymphocyte / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology / Q000378:metabolism; D001667:Binding, Competitive; D004306:Dose-Response Relationship, Immunologic; D005260:Female; D007073:Immunoglobulin E / Q000096:biosynthesis*; D007074:Immunoglobulin G / Q000096:biosynthesis*; D007275:Injections, Intravenous; D015847:Interleukin-4; D007378:Interleukins / Q000276:immunology / Q000494:pharmacology*; D007700:Kinetics; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D009349:Nematode Infections / Q000276:immunology / Q000378:metabolism; D009559:Nippostrongylus; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D007074:Immunoglobulin G; D007378:Interleukins; D015847:Interleukin-4; D007073:Immunoglobulin E