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In Vitro Generation of Allospecific Human CD8+ T Cells of Tc1 and Tc2 Phenotype
David C. Halverson,
Gretchen N. Schwartz,
Charles Carter,
Ronald E. Gress, and
Daniel H. Fowler
From the Transplantation Therapy Section, Medicine Branch, Division of Clinical Sciences, National Cancer Institute; and the Department of Transfusion Medicine, Warren Grant Magnuson Clinical Center, National Institutes of Health, Bethesda, MD.
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- ) (Tc1 culture) or IL-4 (Tc2 culture). Tc1-type CD8 cells secreted the type I cytokines IL-2 and interferon gamma (IFN- ), 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.
Blood, Vol. 90 No. 5 (September 1), 1997:
pp. 2089-2096
© 1997 by The American Society of Hematology.
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