Title | The role of free radicals in the etiology of multistage carcinogenesis | |
Author | Athanasios Valavanidis
Chemistry Department, University of Athens, Panepistimioupolis Zografou, Athens, Greece |
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Citation | Valavanidis, A.: The role of free radicals in the etiology of multistage carcinogenesis, Epitheorese Klin. Farmakol. Farmakokinet. 6(2): 89-98 (1992) | |
Publication Date | Received for publication: 21 July 1992
Accepted for publication: 16 August 1992 |
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Full Text Language | English | |
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Keywords | Free radicals, multistage carcinogenesis. | |
Other Terms | review article | |
Summary | Free radicals have been implicated in many degenerative diseases associated with aging and cancer. The role of free radicals in tumor initiation and/or promotion has been studied extensively. Free radicals can mediate the addition and subtraction of DNA nucleotide bases, thus preventing protein and fatty acids synthesis, oxidize enzymes, affect lipid peroxidation and take part in other cellular processes, which may lead to the development of neoplasms. The most active species are oxygen free radicals, like the superoxide anion (O2-) and the hydroxyl radical (–OH). But free radicals are also useful for biological organisms. A certain amount of cell destruction is necessary for normal body functioning and there is a natural protection system against these reactive molecules. A number of enzymic and non-enzymic antioxidants present in the body can play their protective role. The implication of free radicals in the benzene-induced myelotoxicity and leukemia, asbestos- induced cancers, breast and colon tumors are reviewed in this paper. The destructive effect of free radicals has been also exploited in cancer therapies, namely in radiation treatment and chemotherapy. | |
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