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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Acute effect of amitriptyline, phenobarbital or cobaltous chloride on delta-aminolevulinic acid synthetase, heme oxygenase and microsomal heme content and drug metabolism in rat liver.

Cobaltous chloride (CoCl2) caused very marked decreases of cytochrome P-450, b5 and total heme contents and an increase of heme oxygenase activity. On the contrary, phenobarbital (PB) increased hepatic drug-metabolizing enzymes, but the total heme content remained unchanged. On the other hand, amitriptyline (AMT) caused a marked increase of delta-aminolevulinic acid (delta-ALA) synthetase activity at 12 and 24 hr. In addition, the contents of total heme and cytochrome b5 and the activities of aminopyrine (AM) N-demethylase and aniline (AN) hydroxylase at 24 hr were also increased by AMT, whereas cytochrome P-450 content did not change. This may be explained by the fact that AMT would increase hepatic heme synthesis through the prolonged induction of delta-ALA synthetase, but it may not cause an increase in cytochrome P-450 heme because there are increases in the contents of cytochrome b5 and total heme.[1]


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