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- W2022236303 abstract "Fas ligand (FasL) induces apoptosis in susceptible Fas-bearing cells and is critically involved in regulating T-cell immune responses. It is highly expressed in several human malignancies, and a role in the suppression of antitumor immune responses has been suggested. We evaluated FasL expression in leukemia and normal hematopoietic cells. By Western blotting, all acute leukemic cell lines (n = 9) and primary samples of acute leukemic marrow (n = 4) revealed high levels of FasL. In contrast, much weaker signals were observed in samples of normal marrow (n = 5), and either weak or intermediate expression was seen in chronic myeloid leukemia (CML) in chronic phase (n = 7). Additional leukemic samples were examined by immunohistochemistry. Staining for FasL was negative in 7 of 9 cases of chronic-phase CML, whereas all cases of CML in blast crisis (n = 6), acute lymphoblastic leukemia (n = 6), and acute myeloid leukemia (n = 11) stained strongly in 60 to 100% of nucleated cells. FasL+ leukemic cell lines did not trigger Fas-mediated apoptosis in either Jurkat cells or activated human T lymphocytes, possibly related to the intracellular location of the ligand. Western analysis of normal marrow subpopulations revealed that most FasL in marrow mononuclear cells was expressed by CD7+ lymphocytes. FasL also was strongly expressed in CD34+ hematopoietic progenitor cells from both normal and chronic-phase CML marrow, suggesting a correlation with primitive maturation stage. In summary, high levels of FasL expression were associated with aggressive biologic behavior in leukemia, including transformation of CML to blast crisis. This could potentially represent a response to loss of proapoptotic Fas signaling, which is known to occur in acute leukemic blasts." @default.
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- W2022236303 date "1999-10-01" @default.
- W2022236303 modified "2023-10-15" @default.
- W2022236303 title "Fas ligand is highly expressed in acute leukemia and during the transformation of chronic myeloid leukemia to blast crisis" @default.
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- W2022236303 doi "https://doi.org/10.1016/s0301-472x(99)00091-0" @default.
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