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- W1990274443 abstract "The synergistic cytotoxic activity exhibited by bifunctional alkylating agents in the presence of methylxanthines has been associated with methylxanthine-induced reversal of alkylator-induced DNA replicon initiation inhibition. This has also been seen with methylxanthines and ionizing irradiation. Methylxanthines do not appear exacerbate drug or ionizing radiation-induced damage. We report here a situation in which methylxanthine-induced reversal of DNA replicon initiation inhibition is not associated with increased cytotoxicity of the alkylator. Murine L1210 leukemia cells were assayed for cytotoxicity following treatment with either L-PAM or cis-DDP in the presence or absence of theophylline. Theophylline increased the cytotoxicity seen after L-PAM treatment but failed to increase the cis-DDP induced cytotoxicity. Analysis of pulse-labeled DNA on alkaline sucrose gradients revealed the expected decrease in DNA replicon initiation in L1210 cells treated with either L-PAM or cis-DDP. Theophylline had no effect on replicon initiation in untreated cells. Theophylline reversed the replicon initiation inhibition in cells treated with either L-PAM or cis-DDP. The reason for the apparent lack of added toxicity of the replicon initiation inhibition reversal in L1210 cells treated with theophylline and DDP is unknown." @default.
- W1990274443 created "2016-06-24" @default.
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- W1990274443 date "1984-10-01" @default.
- W1990274443 modified "2023-09-24" @default.
- W1990274443 title "Theophylline reversal of alkylator-induced replicon initiation inhibition: no correlation with DDP-induced cytotoxicity" @default.
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- W1990274443 doi "https://doi.org/10.1016/0165-7992(84)90022-8" @default.
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