Modulation of cytochrome P-450 and glutathione S-transferase isoform expression in vivo by intact and degraded indolyl glucosinolates

被引:49
作者
Bonnesen, C
Stephensen, PU
Andersen, O
Sorensen, H
Vang, O
机构
[1] Roskilde Univ, Dept Chem & Life Sci, DK-4000 Roskilde, Denmark
[2] Royal Vet Univ, Dept Chem, DK-1871 Frederiksberg C, Denmark
来源
NUTRITION AND CANCER-AN INTERNATIONAL JOURNAL | 1999年 / 33卷 / 02期
关键词
D O I
10.1207/S15327914NC330210
中图分类号
R73 [肿瘤学];
学科分类号
100214 ;
摘要
Various dietary substances modulate the xenobiotic metabolism and may thereby protect against toxicity and carcinogenicity of food toxins. The effects of pure indolyl glucosinolates, which are present in cruciferous vegetables, on induction of specific cytochrome P-450 (CYP) and glutathione S-transferase (GST) isoforms have not been studied previously. In the present study, glucobrassicin (GB) and neoglucobrassicin (NeoGB) were purified from broccoli by use of a single-column method. Furthermore, a mixture containing 48% GB, 36% Neo GB, and 16% 4-methoxyglucobrassicin was obtained. The modulatory effects of the pure GB, NeoGB, and the mixture on activities and levels of hepatic CYP 1A, 2B1/2, and 2E1 and alpha- and mu-GST isoforms were investigated in male Wistar rats. The indolyl mixture was the most powerful and NeoGB the weakest inducer of microsomal hepatic CYP 1A1 protein and 7-ethoxyresorufin O-deethylase activity. Furthermore, intact indolyl glucosinolates were more powerful inducers than the in vitro myrosinase-degraded indolyl glucosinolates. The hepatic 7-methoxyresorufin O-deethylase activities, but nor CYP 1A2 protein, were induced by pure GB, whereas the mixture and NeoGB showed only minor effects. Neither CYP 2B1/2 nor 2E1 was induced by the indolyl glucosinolates. None of the hepatic GST subunits analyzed, rGST A1/2, A3, or M3, was induced significantly by the purified indolyl glucosinolates.
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收藏
页码:178 / 187
页数:10
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