title: T cell populations primed by hapten sensitization in contact sensitivity are distinguished by polarized patterns of cytokine production: interferon gamma-producing (Tc1) effector CD8+ T cells and interleukin (Il) 4/Il-10-producing (Th2) negative regulatory CD4+ T cells.
abstract: Contact hypersensitivity (CHS) is a T cell-mediated response to hapten sensitization of the epidermis. The roles of CD4+ and CD8+ T cells in CHS have remained unclear, however, as studies to define either subset as the T cells mediating CHS have provided conflicting results. The goal of this study was to correlate the in vivo function of CD4+ and CD8+ T cells in CHS with the cytokines produced by each T cell population. Antibody-mediated depletion of CD4+ T cells before sensitization of BALB/c mice with 2,4-dinitrofluorobenzene (DNFB) or oxazolone (Ox) resulted in increased and prolonged CHS responses, indicating CD4+ T cells as negative regulators of the response. Depletion of CD8+ T cells resulted in low or abrogated responses, indicating CD8+ T cells as the effector cells in CHS. Sensitization with DNFB or Ox induced lymph node cell populations of CD8+ T cells producing interferon (IFN)-gamma and no interleukin (Il) 4 or Il-10, and CD4+ T cells producing Il-4 and Il-10 and no or little detectable IFN-gamma. The polarized patterns of cytokine production were stimulated by culture of hapten-primed lymph node cells either on anti-T cell receptor antibody-coated wells or with semipurified Langerhans cells isolated from hapten-sensitized mice. Stimulation of cytokine production during culture of hapten-primed CD4+ or CD8+ T cells with Langerhans cells was hapten specific and restricted to class II or class I major histocompatibility complex, respectively. The induction of the CD4+ and CD8+ T cells producing the polarized patterns of cytokines was not restricted to BALB/c mice, as cells from Ox sensitized C57B1/6 and B10.D2 mice produced the same patterns. Collectively, these results expose the induction of two polarized and functionally opposing populations of T cells by hapten sensitization to induce CHS: IFN-gamma-producing effector CD8+ T cells and Il-4/Il-10-producing CD4+ T cells that negatively regulate the response.
authors.affiliation: Department of Immunology, Cleveland Clinic Foundation, Ohio 44195, USA.
authors.forename: H
authors.initials: H
authors.lastname: Xu
authors.forename: N A
authors.initials: NA
authors.lastname: DiIulio
authors.forename: R L
authors.initials: RL
authors.lastname: Fairchild
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D016207:Cytokines / Q000096:biosynthesis*; D003877:Dermatitis, Contact / Q000276:immunology*; D006241:Haptens; D006706:Homeostasis; D007114:Immunization; D016753:Interleukin-10 / Q000096:biosynthesis; D015847:Interleukin-4 / Q000096:biosynthesis; D007801:Langerhans Cells / Q000276:immunology; D008212:Lymphocyte Depletion; D051379:Mice; D008807:Mice, Inbred BALB C; D008810:Mice, Inbred C57BL; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D013997:Time Factors
chemical_list: D016207:Cytokines; D006241:Haptens; D011948:Receptors, Antigen, T-Cell; D016753:Interleukin-10; D015847:Interleukin-4