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• W2945250975 abstract "Successful treatment for acute myeloid leukemia (AML) remains challenging. Inhibiting immune checkpoint to enhance anti-tumor response is an attractive strategy for effective leukemia therapeutics. CD73 is a recently recognized immune checkpoint mediator that is highly expressed on tumor cells and stromal cells in tumor microenvironment. The ectonucleotidase activity of CD73 catalyzes AMP to adenosine, which subsequently inhibits anti-tumor immune responses. In this study, we aim to explore the effect of CD73 in AML. Peripheral blood samples collected from patients with newly diagnosed AML (n = 27) were used in this study. CD73 expression on each immune cell component was examined by flow cytometry. Phenotypic study of CD73-expressing T cells and analysis of the correlation between CD73 and other immune checkpoints were performed using flow cytometry-based assays. Functional status of CD73+ vs. CD73− T cells was assessed in an in vitro cytokine release assay upon CD3/CD28 antibody stimulation. In contrast to the long recognized immune suppressive effect of CD73-adenosine signaling in tumor tissue, we made a striking observation that in AML, CD73 expression on CD8 T cells associates with an increased immune response. CD73+ CD8 T cells are more functional, whereas CD73− CD8 T cells exhibit features of exhaustion manifested by high expression of inhibitory receptors such as PD-1 and TIGIT, increased intracellular expression of Eomes, reduced capacity of cytokine production, and high susceptibility to apoptosis. Our data highlight the potential of CD73 as a double-edged sword in anti-leukemia immunity and argue strongly for the combinational treatment by adding immune checkpoint inhibitors to the CD73-targeting approaches." @default.
• W2945250975 created "2019-05-29" @default.
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• W2945250975 date "2019-04-24" @default.
• W2945250975 modified "2023-10-14" @default.
• W2945250975 title "Downregulation of CD73 associates with T cell exhaustion in AML patients" @default.
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• W2945250975 doi "https://doi.org/10.1186/s13045-019-0728-3" @default.
• W2945250975 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6480867" @default.
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• W2945250975 hasPublicationYear "2019" @default.
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