期刊
CANCER LETTERS
卷 215, 期 2, 页码 141-150出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.canlet.2004.05.016
关键词
nitrofurazone; estrogenic activity; DNA damage; cytochrome P450 reductase; initiation; promotion
类别
Nitrofurazone, a veterinary antimicrobial drug, causes mammary and ovarian tumors in animals. We investigated the mechanisms of carcinogenesis by nitrofurazone. Nitrofurazone significantly stimulated the proliferation of estrogen-dependent MCF-7 cells. Nitrofurazone caused Cu(II)-mediated damage to P-32-5'-end-labeled DNA fragments obtained from human genes only when cytochrome P450 reductase was added. DNA damage was inhibited by catalase and bathocuproine. DNA damage was preferably induced at the 5'-ACG-3' sequence, a hotspot of the p53 gene. These findings suggest that nitrofurazone metabolites are involved in tumor initiation through oxidative DNA damage and nitrofurazone itself enhances cell proliferation, leading to promotion and/or progression in carcinogenesis. (C) 2004 Elsevier Ireland Ltd. All rights reserved.
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