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Cytochrome P450IIE1 (CYP2E1) is induced by skatole and this induction is blocked by androstenone in isolated pig hepatocytes

Wood, Jeffrey D.; Doran (nee Udovikova), Olena; Whittington, Frances; McGivan, John D.


Jeffrey D. Wood

Olena Doran
College Dean of Research and Enterprise

Frances Whittington

John D. McGivan


Skatole, a derivative of tryptophan, is produced in the hind-gut of pigs and is metabolised via hepatic cytochrome P4502E1 (CYP2E1). Excessive accumulation of skatole together with androstenone, a metabolite of testosterone, in adipose tissue in some pigs is a major cause of 'boar taint' and is associated with defective expression of CYP2E1. This phenomenon is not understood because factors regulating CYP2E1 expression in pig liver have not yet been characterised. Therefore effects of skatole and androstenone on CYP2E1 expression were studied using isolated pig hepatocytes as a model system. Skatole induced CYP2E1 protein expression to the same degree as did acetone, a known CYP2E1 inducer. Induction by skatole was maximum between 20 and 28 h and a half-maximum effect was obtained at a skatole concentration of 0.2 mM. Induction of CYP2E1 by skatole was protein-synthesis dependent. Androstenone antagonised the effect of skatole on CYP2E1 expression but did not affect the CYP2E1 protein level when added alone. These results suggest that defective expression of CYP2E1 in some pigs is due to excessive concentrations of androstenone which prevent CYP2E1 induction by its substrate skatole. As a result, skatole metabolism is reduced and skatole is accumulated in adipose tissue. © 2002 Published by Elsevier Science Ireland Ltd.

Journal Article Type Article
Publication Date Apr 20, 2002
Journal Chemico-Biological Interactions
Print ISSN 0009-2797
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 140
Issue 1
Pages 81-92
Keywords cytochrome P4502E1, skatole, hepatocytes
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