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- W4361258500 abstract "<div>Abstract<p>The reciprocal interaction of tumor cells with the immune system is influenced by various members of the tumor necrosis factor (TNF)/TNF receptor (TNFR) family, and recently, glucocorticoid-induced TNFR-related protein (GITR) was shown to stimulate antitumor immunity in mice. However, GITR may mediate different effects in mice and men and impairs the reactivity of human natural killer (NK) cells. Here, we studied the role of GITR and its ligand (GITRL) in human acute myeloid leukemia (AML). Surface expression of GITRL was observed on AML cells in six of seven investigated cell lines, and 34 of 60 investigated AML patients whereas healthy CD34<sup>+</sup> cells did not express GITRL. Furthermore, soluble GITRL (sGITRL) was detectable in AML patient sera in 18 of 55 investigated cases. While the presence of GITRL was not restricted to a specific AML subtype, surface expression was significantly associated with monocytic differentiation. Signaling via GITRL into patient AML cells induced the release of TNF and interleukin-10 (IL-10), and this was blocked by the inhibition of mitogen-activated protein kinases extracellular signal-regulated kinase 1/2. Furthermore, triggering GITR by surface-expressed and sGITRL impaired NK cell cytotoxicity and IFN-γ production in cocultures with leukemia cells, and NK cell reactivity could be restored by blocking GITR and neutralization of sGITRL and IL-10. Thus, whereas a stimulatory role of the GITR-GITRL system in mouse antitumor immunity has been reported, our data show that in humans GITRL expression subverts NK cell immunosurveillance of AML. Our results provide useful information for therapeutic approaches in AML, which, like haploidentical stem cell transplantation, rely on a sufficient NK cell response. [Cancer Res 2009;69(3):1037–45]</p></div>" @default.
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- W4361258500 date "2023-03-30" @default.
- W4361258500 modified "2023-09-25" @default.
- W4361258500 title "Data from Glucocorticoid-Induced Tumor Necrosis Factor Receptor–Related Protein Ligand Subverts Immunosurveillance of Acute Myeloid Leukemia in Humans" @default.
- W4361258500 doi "https://doi.org/10.1158/0008-5472.c.6499916.v1" @default.
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