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High arginase-1 (Arg) expression by myeloid-derived suppressor cells (MDSC) is known to inhibit antitumor T-cell responses through depletion of l-arginine. We have previously shown that nitric oxide (NO), an immune mediator produced from l-arginine, is a potent radiosensitizer of hypoxic tumor cells. This study therefore examines whether Arg+ overexpressing MDSC may confer radioresistance through...
Hypoxia is a principal signature of the tumor microenvironment and is considered to be the most important cause of clinical radioresistance and local failure. Oxygen is so far the best radiosensitizer, but tumor oxygenation protocols are compromised by its metabolic consumption and therefore limited diffusion inside tumors. Many chemical radiosensitizers can selectively target hypoxic tumor cells,...
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