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• W2025306353 abstract "Male Sprague–Dawley rats were treated intraperitoneally with corn oil, the aryl hydrocarbon receptor (AHR) agonist β-naphthoflavone (βNF), or the relatively weak AHR agonist α-naphthoflavone (αNF). Animals treated with βNF experienced a significant loss (12%) of total body mass over 5 days and a dramatic elevation of CYP1A1 mRNA in all of the organs studied. Treatment with αNF had no significant effect on body mass after 5 days and caused only minor increases of liver, kidney, and heart CYP1A1 mRNA. In contrast, lung CYP1A1 mRNA was increased by αNF treatment to levels comparable to that seen with βNF treatment. CYP2E1 mRNA levels were also elevated in liver, lung, kidney, and heart in response to βNF treatment, whereas αNF was without effect. Large increases of CYP1A1-dependent 7-ethoxyresorufin O-deethylation (EROD) activity occurred with microsomes prepared from the tissues of βNF-treated animals. Comparatively small changes were associated with αNF treatment, with the exception of lung, where EROD activity was increased to approximately 60% of that with βNF treatment. CYP2E1-dependent p-nitrophenol hydroxylase (PNP) activity was also increased by βNF treatment in microsomes prepared from kidney (3.1-fold), whereas αNF was without effect. In contrast, αNF or βNF treatment caused significant decreases of lung microsomal PNP (72% and 27% of corn oil control, respectively) and 7-pentoxyresorufin O-deethylation (48% and 17% of corn oil control, respectively) activities, indicating that PNP activity may be catalyzed by P450 isoforms other than CYP2E1 in rat lung. We conclude that βNF and αNF have differential effects on the expression and catalytic activity of CYP1A1 and CYP2E1, depending upon the organ studied. These changes most likely occur as a result of the direct actions of these compounds as AHR agonists, in addition to secondary effects associated with AHR-mediated toxicity. © 1998 John Wiley & Sons, Inc. J Biochem Toxicol 13: 29–40, 1999" @default.
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• W2025306353 date "1999-01-01" @default.
• W2025306353 modified "2023-10-17" @default.
• W2025306353 title "Differential in vivo effects of?-naphthoflavone and?-naphthoflavone on CYP1A1 and CYP2E1 in rat liver, lung, heart, and kidney" @default.
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• W2025306353 doi "https://doi.org/10.1002/(sici)1099-0461(1999)13:1<29::aid-jbt4>3.0.co;2-x" @default.
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