A sensitive assay for mutagenic activity of N-nitrosamines and its use for detection of modulators of the mutagenicity.

T. Negishi, Y. Ohara, H. Hayatsu

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10 Citations (Scopus)


By carrying out the pre-incubation of bacteria with N-nitrosamines under acidic conditions, the mutagenicity of N-nitrosodimethylamine on Salmonella TA100 and E. coli WP2 try, hcr was detected with increased sensitivity, compared to usual assays in neutral buffers. Using this modified assay system, compounds have been screened for their modulating effects on N-nitrosamine-mediated mutagenesis and the following were found to be inhibitors: cysteine, cysteamine, bisulfite, n-propylamine, n-butylamine, n-hexylamine, n-octylamine, n-nonylamine, serotonine, tryptamine, epinephrine, norepinephrine and oleic acid. The mechanisms of inhibition are discussed.

Original languageEnglish
Pages (from-to)685-694
Number of pages10
JournalIARC scientific publications
Issue number41
Publication statusPublished - 1982
Externally publishedYes


ASJC Scopus subject areas

  • Medicine(all)

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