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- W2085671154 abstract "Male (BALB/c × DBA/2) F1 mice were given 3-amino-1,4-dimethyl-5H-pyrido [4,3-b] indole acetate (Trp-P-1; 20 mg/kg body weight) by gavage at 24-h intervals for 1 or 2 weeks, and the effects of Trp-P-1 on the levels of serum total testosterone and hepatic cytochrome P4501a2 (Cyp1a2) were examined. A significant decrease in serum total testosterone level was observed after treatment with Trp-P-1 for 2 weeks, but not for 1 week. Likewise, gene expression levels of testicular androgenic enzymes, including cholesterol side chain cleavage cytochrome P450, 3β-hydroxysteroid dehydrogenase and steroid 17α-hydroxylase/C17-20 lyase, decreased only in the mice treated with Trp-P-1 for 2 weeks. In contrast, levels of the mRNA and apoprotein of hepatic Cyp1a2 and its enzyme activity for O-demethylation of methoxyresorufin significantly increased in the mice treated with Trp-P-1 for 2 weeks, but only a small increase was observed in mice treated for 1 week. In the present study, we demonstrate for the first time that treatment of male mice with Trp-P-1 results in a decrease in serum total testosterone level through suppression of the gene expression of testicular enzymes responsible for androgen biosynthesis, and this then leads to induction of hepatic Cyp1a2. (Cancer Sci 2006; 97: 32–37)" @default.
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- W2085671154 date "2006-01-01" @default.
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- W2085671154 title "A hepatocarcinogenic tryptophan-pyrolyzate component, Trp-P-1, decreases serum total testosterone level and induces hepatic Cyp1a2 in male mice" @default.
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- W2085671154 doi "https://doi.org/10.1111/j.1349-7006.2006.00140.x" @default.
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