title: Stigma variations: observations on suppressor T cells and leprosy.
abstract: Few areas of immunology have been so controversial as that of suppressor T cells. Studies of T cell clones derived from patients with infectious diseases, including leprosy, and allergies have allowed the delineation of functional human T cell subsets. Both CD4 and CD8 cells can be discriminated into subsets that are differentiated by their functions and patterns of lymphokines. Type 1 CD4 cells reactive with lepromin and PPD produce IFN-gamma and IL-2 predominantly, while Type 2 CD4 clones, specific for tetanus toxoid, produce IL-4 and IL-5. Type 1 CD8 cytotoxic T lymphocytes produce predominantly IFN-gamma and IL-2. T suppressor clones derived from immunologically unresponsive lepromatous leprosy patients are antigen-specific, CD8 cells, HLA-DQ restricted, and produce predominantly IL-4, and were designated Type 2 CD8 cells. Several models for peripheral tolerance based on distinct functional T cell subsets are discussed. Previous models of T cell suppression in the mouse and the reciprocal relationship between humoral and cell-mediated immunity in general are reinterpreted in light of such T cell subset interactions.
authors.affiliation: Howard Hughes Medical Institute, Albert Einstein College of Medicine, Bronx, New York 10461.
authors.forename: B R
authors.initials: BR
authors.lastname: Bloom
authors.forename: R L
authors.initials: RL
authors.lastname: Modlin
authors.forename: P
authors.initials: P
authors.lastname: Salgame
mesh_terms: D000818:Animals; D006801:Humans; D007108:Immune Tolerance; D007918:Leprosy / Q000276:immunology*; D008222:Lymphokines / Q000276:immunology; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
chemical_list: D008222:Lymphokines