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. 1978 Dec;75(12):6149–6153. doi: 10.1073/pnas.75.12.6149

Tumor promoter induces sister chromatid exchanges: relevance to mechanisms of carcinogenesis.

A R Kinsella, M Radman
PMCID: PMC393136  PMID: 282631

Abstract

12-O-Tetradecanoylphorbol 13-acetate (TPA), a powerful tumor promoter, is shown to induce sister chromatid exchanges (SCEs), whereas the nonpromoting derivative 4-O-methyl-TPA does not. Inhibitors of tumor promotion--antipain, leupeptin, and fluocinolone acetonide--inhibit formation of such TPA-induced SCEs. TPA is a unique agent in its induction of SCEs in the absence of DNA damage, chromosome aberrations, mutagenesis, or significant toxicity. Because TPA is known to induce several gene functions, we speculate that it might also induce enzymes involved in genetic recombination. Thus, the irreversible step in tumor promotion might be the result of an aberrant mitotic segregation event leading to the expression of carcinogen/mutagen-induced recessive genetic or epigenetic chromosomal changes.

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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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