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Xenobiotica
the fate of foreign compounds in biological systems
Volume 18, 1988 - Issue 7
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Original Article

Effects of induction on the metabolism and cytochrome P-450 binding of harman and other β-carbolines

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Pages 785-796 | Received 01 May 1987, Accepted 04 Dec 1987, Published online: 30 Sep 2009
 

Abstract

1. The metabolism of harman by liver microsomes from non-induced, phenobarbitone (PB)-induced and 3-methylcholanthrene (MC)-induced mice was investigated. Initial reaction rates for harman disappearance were measured and showed a 4-fold induction by PB and a 10˙6-fold induction by MC.

2. The major metabolite formed with each microsomal preparation was identified as 6-hydroxyharman.

3. Microsomal cytochrome P-450 binding was measured for harman and other β-carbolines and both Type I and Type II binding spectra were observed, being dependent upon the mode of induction.

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