title: Functional CD4 T cell subset interplay in an intact immune system.
abstract: Immunization with human collagen IV has been shown to lead to the selective activation of Th-1 and Th-2-like cells in vivo depending on the I-A genotype of the mice. Mice expressing I-As generate Th-1 cells, and mice expressing I-Ab generate Th-2 cells after immunization. We examined the response of (bxs)F1 hybrid mice to determine the types of CD4 T cell activated. We found that Th-1-like responses dominated, in that CD4 T cells from human collagen IV-primed mice displayed good proliferative responses and little ability to induce antibody formation, and secreted IFN-gamma and not IL-5. Most of the Th-1-like activity of F1 hybrid T cells was I-As restricted. Inhibition of Th-1 cell priming using anti-I-As antibody administered with the priming Ag in vivo revealed Th-2-like activity, in that the CD4 T cells now secreted IL-5 and not IFN-gamma and induced antibody formation. Additional studies indicated that anti-IFN-gamma treatment in vivo also revealed Th-2 cells, suggesting that I-As-restricted CD4 T cells producing or controlling the production of IFN-gamma suppress Th-2 priming.
authors.affiliation: Department of Pathology, Howard Hughes Medical Institute, Yale University School of Medicine, New Haven, CT 06510.
authors.forename: J S
authors.initials: JS
authors.lastname: Murray
authors.forename: J
authors.initials: J
authors.lastname: Madri
authors.forename: T
authors.initials: T
authors.lastname: Pasqualini
authors.forename: K
authors.initials: K
authors.lastname: Bottomly
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D003094:Collagen / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007371:Interferon-gamma / Q000502:physiology; D008213:Lymphocyte Activation; D051379:Mice; D008815:Mice, Inbred Strains; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D006377:T-Lymphocytes, Helper-Inducer / Q000276:immunology*
chemical_list: D000949:Histocompatibility Antigens Class II; D007371:Interferon-gamma; D003094:Collagen