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. 1986 Jun;83(12):4514–4518. doi: 10.1073/pnas.83.12.4514

Role of hydrogen peroxide and hydroxyl radical formation in the killing of Ehrlich tumor cells by anticancer quinones.

J H Doroshow
PMCID: PMC323764  PMID: 3086887

Abstract

The cytotoxicity of the clinically important antineoplastic quinones doxorubicin, mitomycin C, and diaziridinylbenzoquinone for the Ehrlich ascites carcinoma was significantly reduced or abolished by the antioxidant enzymes catalase and superoxide dismutase, the hydroxyl radical scavengers dimethyl sulfoxide, diethylurea, and thiourea, and the iron chelators deferoxamine, 2,2-bipyridine, and diethylenetriaminepentaacetic acid. However, tumor cell killing by 5-iminodaunorubicin, a doxorubicin analog with a modified quinone function that prohibits oxidation-reduction cycling, was not ameliorated by any of the free radical scavengers tested. Furthermore, treatment of intact tumor cells with doxorubicin, mitomycin C, and diaziridinylbenzoquinone but not 5-iminodaunorubicin generated the hydroxyl radical, or a related chemical oxidant, in vitro in a process that required hydrogen peroxide, iron, and intact tumor cells. These results suggest that drug-induced hydrogen peroxide and hydroxyl radical production may play a role in the antineoplastic action of redox active anticancer quinones.

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Selected References

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