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• W1973750369 abstract "Interleukin-1 (IL-1) has radioprotective activity in hematopoietic lineages and in other normal cell renewal systems, but little is known about the effects of IL-1 alpha on the radiosensitivity of tumor cell populations. The present studies were conducted to investigate the effects of IL-1 alpha on the radiosensitivity of clonogenic cells in RIF-1 and SCC-7 tumors. Radioresistance was detected within 2-4 after administration of IL-1 alpha (0.5 micrograms/mouse, ip) and characterized by increases in D(o), Dq, alpha/beta and SF2. This radioresistance was similar to that seen in tumors rendered totally hypoxic before X irradiation. Tirapazamine, a hypoxic cell cytotoxin, and IL-1 alpha had synergistic schedule-dependent antitumor activity in vivo, suggesting that IL-1-induced radioresistance in vivo is due to hypoxia. Radioresistance induced by IL-1 alpha was transient, and the data suggested reoxygenation within 12 h. In vitro, IL-1 alpha had no direct effect on the radiosensitivity of SCC-7 cells in tissue culture under aerobic conditions. However, an increase in D(o), alpha/beta and SF2 was seen in clonogenic tumor cells from primary cultures treated with IL-1 alpha under aerobic conditions. Superoxide dismutase and catalase prevented the induction of radioresistance by IL-1 alpha in vitro, suggesting that oxidative responses from tumor macrophages after administration of IL-1 alpha may be responsible for induced radioresistance by IL-1 in vitro. Although oxidant stress induced by IL-1 and in vitro in our models, the mechanisms by which such responses modulate tumor radiosensitivity in vivo and in vitro are likely quite different." @default.
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• W1973750369 date "1996-02-01" @default.
• W1973750369 modified "2023-09-26" @default.
• W1973750369 title "Radioresistance in Murine Solid Tumors Induced by Interleukin-1" @default.
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• W1973750369 doi "https://doi.org/10.2307/3579169" @default.
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