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• W2111585885 startingPage "6348" @default.
• W2111585885 abstract "Abstract Purpose: Regulatory T cell (Treg) frequency and activity are increased in cancer patients and play a major role in tumor escape. Although disease progression is favored by the presence of Treg, mechanisms used by Treg to suppress antitumor immunity are unknown. The ectonucleotidases CD39 and CD73 are expressed in Treg and convert ATP into immunosuppressive adenosine. In this study, the involvement of the adenosinergic pathway in Treg-mediated suppression in head and neck squamous cell carcinoma (HNSCC) patients was evaluated. Experimental Design: HNSCC patients with an active disease (n = 19) and patients with no evident disease after therapy (n = 14) were studied. Ectonucleotidase expression on CD4+ T cells and CD4+CD25high Treg was evaluated by flow cytometry and compared with normal controls. Ectonucleotidase activity was also compared within these three groups. The data were analyzed for associations of ectonucleotidase expression/function with disease stage. Results: The percentages and expression levels of CD39 and CD73 in CD4+ T cells and Treg were greater in HNSCC than in normal controls and highest in patients with no evident disease. Patients' Treg hydrolyzed ATP at higher rates and produced higher levels of adenosine than normal controls' Treg. The increased frequency and enzymatic activity of CD4+CD39+ cells corresponded to increased adenosine-mediated suppression of effector T cells, which was partly inhibited by ARL67156, an ectonucleotidase inhibitor, and by ZM241385, a selective A2a/A2b receptor antagonist. Conclusions: CD39+ Treg frequency and adenosine-mediated suppression are significantly increased in HNSCC patients. The adenosinergic pathway is involved in Treg-mediated immunosuppression in cancer and its attenuation could be a promising immunotherapeutic strategy for patients with HNSCC. (Clin Cancer Res 2009;15(20):6348–57)" @default.
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• W2111585885 date "2009-10-14" @default.
• W2111585885 modified "2023-10-16" @default.
• W2111585885 title "Increased Ectonucleotidase Expression and Activity in Regulatory T Cells of Patients with Head and Neck Cancer" @default.
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• W2111585885 doi "https://doi.org/10.1158/1078-0432.ccr-09-1143" @default.
• W2111585885 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2763335" @default.
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• W2111585885 hasPublicationYear "2009" @default.
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