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. 1994 Dec;102(Suppl 10):155–157. doi: 10.1289/ehp.94102s10155

Potential molecular mechanisms of oxidant-induced carcinogenesis.

J H Jackson 1
PMCID: PMC1567006  PMID: 7705290

Abstract

Chronic exposure to oxidants is associated with an increased incidence of malignancy; however, the mechanism(s) by which oxidants contribute to carcinogenesis is unknown. Since oncogene activation plays an important role in carcinogenesis, we hypothesized that hydroxyl radical-induced DNA damage might contribute to carcinogenesis by causing oncogene activation. The studies reported herein demonstrate that hydroxyl radical-induced DNA damage can activate the K-ras 4B and C-Raf-l oncogenes by causing point mutations and deletions, respectively. In addition, our results indicate that a) hydroxyl radical-induced DNA damage causes selective base substitutions; b) the four DNA bases have different susceptibilities to hydroxyl radical-induced mutations; and c) hydroxyl radical-induced mutations are not randomly distributed among oncogene codons. Our studies suggest that oncogene activation could be one potential mechanism by which oxidants contribute to carcinogenesis.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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