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Effects of acetone administration on cytochrome P-450-dependent monooxygenases in hamster liver, kidney, and lung

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Abstract

The effects of acetone on liver, kidney, and lung monooxygenases were studied using hamsters administered 8% acetone in drinking water. Binding of aniline to liver microsomes induced a type II difference spectrum, and the spectral binding was enhanced in hamsters pretreated with acetone. Administration of acetone caused significant increases of cytochrome P-450 and cytochromeb 5 contents in liver microsomes. The increases of the hemeproteins were associated with induction of monooxygenase activities toward test substrates, aniline, N-nitrosodimethylamine, benzphetamine, benzo(a)pyrene, and 7-ethoxycoumarin. In the kidneys, acetone administration increased microsomal contents of the hemeprotein and monooxygenase activities toward aniline, N-nitrosodimethylamine, and 7-ethoxycoumarin, but not benzphetamine or benzo(a)pyrene. In the lungs, acetone pretreatment increased aniline hydroxylase activity without affecting the levels of N-nitrosodimethylamine demethylase, cytochromes P-450 andb 5. In marked contrast to the inductive effects in the liver, acetone administration markedly decreased lung microsomal benzo(a)pyrene hydroxylase and 7-ethoxycoumarin O-deethylase activities. Gel electrophoresis of liver and kidney microsomes from control and acetone-treated hamsters revealed that acetone treatment enhanced the intensity of a protein band(s) in the cytochrome P-450 molecular weight region. Immunoblotting of the microsomal proteins showed that the protein band induced by acetone in hamster liver, kidney and lung was cross-reactive with antibody raised against ethanol-inducible human liver cytochrome P-450. These results demonstrate that acetone has the ability to uniformly induce a specific form of cytochrome P-450, designated as IIE1, and to cause differential changes of monooxygenase activities in the hamster tissues. The complex effects of acetone on hepatic and extrahepatic monooxygenase systems may be important determinants of tissue-specific chemical toxicity.

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Abbreviations

NDMA:

N-nitrosodimethylamine

P-450:

cytochrome P-450

bs :

cytochromebs

SDS-PAGE:

sodium dodecyl sulfate-polyacrylamide gel electrophoresis

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The nomenclature of P-450 used in this report follows the system recommended by Nebert et al. (1987, 1989). P-450 IIE1 has also been referred to as P-450ac by Patten et al. (1986), P-450j by Ryan et al. (1986), and as isozyme 3a and P-450ALC by Coon and Koop (1987) in various species.

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Ueng, TH., Tsai, JN., Ju, JM. et al. Effects of acetone administration on cytochrome P-450-dependent monooxygenases in hamster liver, kidney, and lung. Arch Toxicol 65, 45–51 (1991). https://doi.org/10.1007/BF01973502

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  • DOI: https://doi.org/10.1007/BF01973502

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