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Abstract

Menthofuran-dependent and independent aspects of pulegone hepatotoxicity: roles of glutathione.

D Thomassen, J T Slattery and S D Nelson
Journal of Pharmacology and Experimental Therapeutics May 1990, 253 (2) 567-572;
D Thomassen
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J T Slattery
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S D Nelson
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Abstract

Pulegone, a monoterpene that protects source plants against predators, is a hepatotoxic constituent of the folklore abortifacient pennyroyal oil. In the rat, pulegone extensively depleted glutathione measured in both liver tissue and plasma, and its toxicity was markedly enhanced in animals treated with buthionine sulfoximine. The glutathione-depleting effect of pulegone was compromised following inhibition of cytochrome P-450 by piperonyl butoxide. In addition, we found no evidence for conjugation of glutathione to unchanged pulegone in vitro. Administration of menthofuran, a known oxidative and hepatotoxic metabolite of pulegone, only marginally affected glutathione levels in plasma and liver, and toxicity was not augmented by buthionine sulfoximine. These results provide indirect evidence for cytochrome P-450-catalyzed bioactivation of pulegone via at least two independent pathways: 1) the formation and subsequent activation of menthofuran from pulegone; and 2) the formation of reactive intermediate(s) from pulegone, but not menthofuran, which can be detoxified through a mechanism requiring reduced glutathione.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 253, Issue 2
1 May 1990
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Abstract

Menthofuran-dependent and independent aspects of pulegone hepatotoxicity: roles of glutathione.

D Thomassen, J T Slattery and S D Nelson
Journal of Pharmacology and Experimental Therapeutics May 1, 1990, 253 (2) 567-572;

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Abstract

Menthofuran-dependent and independent aspects of pulegone hepatotoxicity: roles of glutathione.

D Thomassen, J T Slattery and S D Nelson
Journal of Pharmacology and Experimental Therapeutics May 1, 1990, 253 (2) 567-572;
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