FORMATION AND PERSISTENCE OF SAFROLE - DNA-ADDUCTS OVER A 10000-FOLD DOSE RANGE IN MOUSE-LIVER

被引:39
作者
GUPTA, KP [1 ]
VANGOLEN, KL [1 ]
PUTMAN, KL [1 ]
RANDERATH, K [1 ]
机构
[1] BAYLOR COLL MED,DEPT PHARMACOL,DIV TOXICOL,HOUSTON,TX 77030
关键词
D O I
10.1093/carcin/14.8.1517
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
The spice constituent safrole (1-allyl-3,4-methylenedioxy-benzene) and related allylbenzenes form DNA adducts and are rodent carcinogens. This study examined both dose and time dependence of hepatic safrole - DNA adduct formation over a 10 000-fold dose range up to 30 days after single administration. Female CD-1 mice were treated with safrole i.p. at 0.001, 0.01, 0.1, 1.0, and 10.0 mg/mouse in 0.2 ml tricaprylin or with vehicle alone. Liver DNA was analyzed at 0.5, 1, 2, 3, 7, 15 and 30 days via the dinucleotide/monophosphate version of the P-32-postlabeling assay. An approximately 10-fold increase in total safrole adduct levels with each successive 10-fold increase in dose was observed, giving relative adduct labeling (RAL) values of 10(-9)-10(-5). Each dose elicited identical kinetics of adduct formation, showing peak levels at 2 days and only slight decreases thereafter. The time course of adduct persistence was independent of the dose (0.01 - 10 mg/mouse). An in vitro experiment established that the assay responded in strictly linear fashion to adduct concentration over a 10 000-fold range, and thus was suitable for in vivo dosimetry. DNA synthesis, as measured by [H-3]thymidine incorporation, was enhanced only for the 10.0 mg dose at 2, 3 and 7 days. These results indicate a linear response of safrole-DNA adduct formation and persistence in mouse liver following administration of minute (0.001 mg/mouse) to high (10.0 mg/mouse) doses of the carcinogen.
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页码:1517 / 1521
页数:5
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