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• W2001313295 abstract "Analysis of the cytotoxic effector mechanisms by which T-cell subsets mediate graft-versus-leukemia (GVL) activity is complicated by systems that use unfractionated T cells and leukemias that express alloantigens in addition to tumor-specific antigens. In this study, we used MMB1.10, a myeloid leukemia of C57Bl/6 (B6) origin, to examine the cytolytic pathways employed by syngeneic GVL-mediating, and therefore tumor antigen-specific, T-cell subsets. Wright-Giemsa staining and flow cytometric analysis indicated that MMB1.10 cells exhibited the morphology and markers most consistent with a monocytic-myeloid origin. Although reverse transcription-polymerase chain reaction analysis revealed that MMB1.10 cells expressed tumor necrosis factor (TNF) receptor types I and H, in vitro assays suggested that these cells were resistant to TNF-alpha-mediated cytotoxicity. For study of in vivo GVL responses, mice were challenged with MMBl.10 cells, lethally irradiated, and administered anti-Thy-1-treated (T-cell-depleted) bone marrow (ATBM) either alone or in combination with T-cell subsets from MMB1.10-presensitized mice. In regard to CD4+ donor T cells, 4 x 10(6) MMB1.10-presensitized wild-type (wt) cells exhibited increased GVL responses and survival values relative to tumor-challenged recipients of ATBM only. CD4 T cells from either perforin-deficient (pfp0) or Fas ligand (FasL)-deficient (gld) mice exhibited a lower level of GVL activity but did not produce any long-term survivors. Recipients of 5 x 10(6) wt B6 CD8+ T cells had significantly improved survival relative to tumor-challenged mice that received ATBM only. The same dose of gld CD8+ T cells exhibited a reduced but significant level of GVL activity, whereas cells from mice that were perforin-deficient or cytotoxicity doubly deficient (cdd) (ie, lacking perforin and FasL) exhibited no discernable GVL activity. Doubling the gld CD8+ T-cell dose to 10(7) cells resulted in further improved survival of recipients. We conclude that GVL effects mediated by CD4+ T cells can depend on either perforin- or FasL-mediated mechanisms, whereas the CD8+ T-cell subset is heavily dependent on perforin-mediated cytotoxicity." @default.
• W2001313295 created "2016-06-24" @default.
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• W2001313295 date "2000-05-01" @default.
• W2001313295 modified "2023-10-16" @default.
• W2001313295 title "T-cell subsets mediate graft-versus-myeloid leukemia responses via different cytotoxic mechanisms" @default.
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• W2001313295 doi "https://doi.org/10.1016/s1083-8791(00)70005-x" @default.
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