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Abstract
The effect of 10(-5) M bromodeoxyuridine (BrdUrd) substitution in C3H 10T1/2 cells was evaluated. Cellular toxicity increased rapidly for BrdUrd exposure times that were longer than the population doubling time. Radiosensitization by BrdUrd exposure was almost complete after one cell doubling time and was characterized by a decrease in D0 and the survival curve shoulder. Exposure to BrdUrd for one cell doubling time produced only very low transformation levels, but for prolonged BrdUrd exposure times, the transformation frequency per viable cell increased significantly. BrdUrd incorporation also enhanced radiation induction of transformation above the transformation levels resulting from the independent action of X rays or BrdUrd treatment. These results show that BrdUrd is a transforming agent in C3H 10T1/2 cells and thus may be a carcinogen and that BrdUrd can enhance radiation-induced transformation.
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