title: In vitro generation of allospecific human CD8+ T cells of Tc1 and Tc2 phenotype.
abstract: We have previously shown that allospecific murine CD8+ T cells of the Tc1 and Tc2 phenotype could be generated in vitro, and that such functionally defined T-cell subsets mediated a graft-versus-leukemia (GVL) effect with reduced graft-versus-host disease (GVHD). To evaluate whether analogous Tc1 and Tc2 subsets might be generated in humans, CD8+ T cells were allostimulated in the presence of either interleukin-12 (IL-12) and transforming growth factor-beta (TGF-beta) (Tc1 culture) or IL-4 (Tc2 culture). Tc1-type CD8 cells secreted the type I cytokines IL-2 and interferon gamma (IFN-gamma), whereas Tc2-type cells primarily secreted the type II cytokines IL-4, IL-5, and IL-10. Both cytokine-secreting populations effectively lysed tumor targets when stimulated with anti-T-cell receptor (TCR) antibody; allospecificity of Tc1- and Tc2-mediated cytolytic function was demonstrated using bone marrow-derived stimulator cells as targets. In addition, both Tc1 and Tc2 subsets were capable of mediating cytolysis through the fas pathway. We therefore conclude that allospecific human CD8+ T cells of Tc1 and Tc2 phenotype can be generated in vitro, and that these T-cell populations may be important for the mediation and regulation of allogeneic transplantation responses.
authors.affiliation: Division of Clinical Sciences, National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Halverson
authors.forename: G N
authors.initials: GN
authors.lastname: Schwartz
authors.forename: C
authors.initials: C
authors.lastname: Carter
authors.forename: R E
authors.initials: RE
authors.lastname: Gress
authors.forename: D H
authors.initials: DH
authors.lastname: Fowler
mesh_terms: D000818:Animals; D016827:CD8 Antigens / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000276:immunology*; D002454:Cell Differentiation; D002478:Cells, Cultured; D016207:Cytokines / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D006801:Humans; D007519:Isoantigens / Q000276:immunology*; D008213:Lymphocyte Activation / Q000276:immunology*; D051379:Mice; D016176:T-Lymphocyte Subsets / Q000276:immunology*
chemical_list: D016827:CD8 Antigens; D016207:Cytokines; D007519:Isoantigens