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Pre-irradiation administration of the radioprotectant drug WR-2721 to rats resulted in a significant reduction in radiation-induced increases in excretion rates of prostaglandins (PGE and PGF2 alpha) and thromboxane (TxB2). In animals not irradiated. WR-2721 did not significantly alter these excretion rates. Dramatic reductions in the levels of urinary PGE and TxB2 were observed following exposure to 9.0 Gy of whole-body, unilateral gamma-radiation in WR-2721-treated animals, whereas changes in PGF2 alpha levels were less pronounced. Radiation-induced diuresis was also significantly depressed in animals given WR-2721 before irradiation. Reduced prostaglandin excretion rates may reflect the general radioprotective capacity of the chemoprotector WR-2721 on the release of prostaglandins from radiation-damaged tissue. The decrease in diuresis may be related to the observed prostaglandin decreases.
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