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Magnesium ions affect the quantitative but not the qualitative microsome mediated binding of benzo[a]pyrene to DNA

Authors
Journal
Chemico-Biological Interactions
0009-2797
Publisher
Elsevier
Publication Date
Volume
28
Identifiers
DOI: 10.1016/0009-2797(79)90168-6

Abstract

Abstract Five distinct hydrocarbon-deoxyribonucleoside adducts are separated by high pressure liquid chromatography after reaction of benzo[ a]pyrene with calf thymus DNA in the presence of liver microsomes from 3-methylcholanthrene treated rats. The two major adducts co-chromatograph with deoxyribonucleoside adducts obtained after hydrolysis of calf thymus DNA previously reacted with liver microsomal metabolically activated 9-hydroxybenzo[ a]pyrene or trans-7,8-dihydro-7,8-dihydroxybenzo[ a]pyrene. High magnesium ion concentrations in the microsomal incubations cause a significant decrease in the covalent binding of the hydrocarbon to DNA but do not affect the qualitative distribution of the individual benzo[ a]pyrene-deoxyribonucleoside adducts.

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