MUTAGENICITY AND IRREVERSIBLE BINDING OF THE HEPATOCARCINOGEN, 2,4-DIAMINOTOLUENE

被引:20
作者
AUNE, T
NELSON, SD
DYBING, E
机构
[1] NATL INST PUBL HLTH,DEPT ENVIRONM TOXICOL,OSLO 1,NORWAY
[2] UNIV WASHINGTON,DEPT PHARMACEUT SCI,SEATTLE,WA 98195
关键词
D O I
10.1016/0009-2797(79)90066-8
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Mutagenicity of 2,4-diaminotoluene (DAT) in the Salmonella mutagenicity assay was increased with liver fractions from phenobarbital (PB) or β-naphthoflavone (BNF) treated rats. Substitutions of the hydrogens in the methyl group of 2,4-DAT with deuterium resulted in a decrease in mutagenicity. Incubation of rat liver microsomes with tritiated 2,4-DAT in the presence of NADPH led to the formation of irreversibly bound products to microsomal protein. The rates of binding were not increased using microsomes from PB or BNF-treated rats and was not altered by deuterium substitution in the methyl group. Addition of Superoxide dismutase, glutathione (GSH) or rat liver supernatant reduced 2,4-DAT irreversible binding, whereas 2,4-DAT mutagenicity was unaffected by Superoxide dismutase addition. Injection of tritiated 2,4-DAT 100 mg/kg to rats lead to its irreversible binding to liver protein and ribosomal RNA and to kidney protein in vivo, again protein binding was not increased after prior treatment with PB or BNF. No irreversible interaction of tritiated 2,4-DAT with DNA either in vitro or in vivo could be demonstrated. © 1979.
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页码:23 / 33
页数:11
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