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- W2065500401 abstract "The hypoxic and euoxic radiation response for Chinese hamster lung and A549 human lung carcinoma cells was obtained under conditions where their nonprotein thiols, consisting primarily of glutathione (GSH), were depleted by different mechanisms. The GSH conjugating reagent diethylmaleate (DEM) was compared to DL-buthionine-S,R-sulfoximine (BSO), an inhibitor of glutathionine biosynthesis. Each reagent depleted cellular GSH to less than 5% of control values. A 2-hr exposure to 0.5 mM DEM or a 4- or 24-hr exposure to BSO at 10 or 1 mM, respectively, depleted cellular GSH to less than 5% of control values. Both agents sensitized cells irradiated under air or hypoxic conditions. When GSH levels are lowered to less than 5% by both agents, hypoxic DEM-treated cells exhibited slightly greater X-ray sensitization than hypoxic BSO-treated cells. The D0's for hypoxic survival curves were as follows: control, 4.87 Gy; DEM, 3.22 Gy; and BSO, 4.30 Gy for the V79 cells and 5.00 Gy versus 4.02 Gy for BSO-treated A549 cells. The D0's for aerobic V79 cells were 1.70 Gy versus 1.13 Gy, DEM, and 1.43 Gy for BSO-treated cells. The D0's for the aerobic A549 were 1.70 and 1.20 for BSO-treated cells. The aerobic and anoxic sensitization of the cells results in the OER's of 2.8 and 3.0 for the DEM- and BSO-treated cells compared to 2.9 for the V79 control A549. BSO-treated cells showed an OER of 3.3 versus 3 for the control. Our results suggest that GSH depletion by either BSO or DEM sensitizes aerobic cells to radiation but does not appreciably alter the OER." @default.
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- W2065500401 title "Cellular Glutathione Depletion by Diethyl Maleate or Buthionine Sulfoximine: No Effect of Glutathione Depletion on the Oxygen Enhancement Ratio" @default.
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- W2065500401 doi "https://doi.org/10.2307/3576226" @default.
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