Alkylation of dna and carcinogenicity of w-nitroso compounds

Ruggero Montesano, Anthony E. Pegg, Geoffrey P. Margison

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

The possible mode of action of two classes of highly organ- and species-specific carcinogenic N-nitroso compounds, namely the H-nitrosamines and H-nitrosamides, is outlined in this review. Chemical or enzymatic conversion of these agents into active alkylating species is a prerequisite for their biological activity. Although these species are capable of reacting with all cellular macromolecules, there is good evidence that their ability to attack DNA is related to their carcinogenicity. This paper reviews the reasons and experimental support for the hypothesis that it is specifically alkylation of DNA at the O6 position of guanine that initiates malignant transformation, an important factor being the presence of an enzyme system capable of eliminating O6-aikyiguanine from DNA. No such repair reaction appears to exist for this or other alkylation products when they are present in RNA. The activity of this system is enhanced by chronic administration of alkylating agents, and the role that this may play in carcinogenesis is discussed.

Original languageEnglish (US)
Pages (from-to)81-88
Number of pages8
JournalJournal of Toxicology and Environmental Health
Volume6
Issue number5-6
DOIs
StatePublished - Jan 1 1980

Fingerprint

Nitroso Compounds
Alkylation
DNA
Nitrosamines
Alkylating Agents
Guanine
Bioactivity
RNA
Macromolecules
Carcinogenesis
Repair
Enzymes

All Science Journal Classification (ASJC) codes

  • Toxicology
  • Pollution

Cite this

Montesano, Ruggero ; Pegg, Anthony E. ; Margison, Geoffrey P. / Alkylation of dna and carcinogenicity of w-nitroso compounds. In: Journal of Toxicology and Environmental Health. 1980 ; Vol. 6, No. 5-6. pp. 81-88.
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Alkylation of dna and carcinogenicity of w-nitroso compounds. / Montesano, Ruggero; Pegg, Anthony E.; Margison, Geoffrey P.

In: Journal of Toxicology and Environmental Health, Vol. 6, No. 5-6, 01.01.1980, p. 81-88.

Research output: Contribution to journalArticle

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