Abstract
The effects of isoniazid and fasting on hepatic CYP2E1 in the suncus were investigated. Aniline hydroxylation and N-nitrosodimethylamine demethylation, which are known to be catalyzed by CYP2E1, in liver microsomes were induced and suppressed by the treatment with isoniazid and the fasting, respectively. Immunoblot analysis indicated that CYP2E1 protein in liver microsomes from isoniazid-treated suncus was increased in contrast to the result with the fasting of the suncus. Northern blot analysis showed that the treatment of suncus with isoniazid increased the expression of CYP2E1 mRNA in livers although the fasting of the suncus significantly decreased CYP2E1 mRNA. These results suggest that the regulation of hepatic CYP2E1 in the suncus by treatment with isoniazid and fasting was different from that in rats.
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