Abstract:
:Lung tumors were induced in A/J mice by the tobacco-specific nitrosamine 4-(methylnitrosamino)-1-(3-pyridyl)-1-butanone (NNK) and the related compounds acetoxymethylmethylnitrosamine (AMMN) and 4-acetoxymethylnitrosamino)-1-(3-pyridyl)-1-butanone (NNKOAc). NNK both methylates and pyridyloxobutylates DNA while AMMN and NNKOAc only methylate or pyridyloxobutylate DNA, respectively. The lung tumors were analyzed for mutations in the Ki-ras oncogene by PCR amplification followed by either restriction fragment length polymorphism, hybridization, or sequencing procedures. NNK induced GGT to GAT mutations in codon 12 (26 of 28 samples analyzed). AMMN induced GGT to GAT mutations in 18 of 18 samples. In contrast, NNKOAc induced a variety of changes including GGT to GAT (8/21), GGT to TGT (5/21) and GGT to GTT (4/21) mutations. These results demonstrate that DNA methylation causes mainly G to A transitions in the Ki-ras gene of A/J mouse lung tumors, consistent with previous results and a role for O6-methyl-guanine, while DNA pyridyloxobutylation induces G to A transitions as well as G to T transversions, perhaps due to the steric bulk of the adducts which are formed. The results are discussed with respect to mutations observed in rodent and human lung tumors.
journal_name
Carcinogenesisjournal_title
Carcinogenesisauthors
Ronai ZA,Gradia S,Peterson LA,Hecht SSdoi
10.1093/carcin/14.11.2419subject
Has Abstractpub_date
1993-11-01 00:00:00pages
2419-22issue
11eissn
0143-3334issn
1460-2180journal_volume
14pub_type
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