Nov 1, 1975

Further studies of metyrapone effects upon anilide hydroxylation

Drug Metabolism and Disposition : the Biological Fate of Chemicals
K C Leibman, E Ortiz

Abstract

The enhancing effect of metyrapone upon the p-hydroxylation of acetanilide has been confirmed with the use of a new gas-chromatographic method for the determination of acetaminophen. This effect has been shown not to be due to inhibition of hydrolysis of acetaminophen or interference with its determination, or to preferential formation of other phenolic metabolites. This effect of metyrapone is remarkably substrate-specific: phenol formation from the homologues of acetanilide, formanilide and propionanilide, and that from the sulfonamide analog of acetanilide, methanesulfonanilide, is inhibited by metyrapone over the concentration range in which acetanilide hydroxylation is enhanced. The same substrate specificity was observed when the modifier was acetophenone. alpha,alpha'-Dipyridyl, however, enhances phenol formation from all three carbonacylanilides, but does not affect that from methanesulfonanilide.

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Mentioned in this Paper

Anilides
Acetaminophen
Phenol
SU 4885
Metyrapone
Bipyridyl
Acetanilide
Sulfonamides
Sulfonamide Anti-Infective Agents
Metabolic Inhibition

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