Apparent induction of microsomal carboxylesterase activities in tissues of clofibrate-fed mice and rats

Mohamed Bassem A Ashour, David E. Moody, Bruce D. Hammock

Research output: Contribution to journalArticle

23 Citations (Scopus)

Abstract

Treatment with 0.5% ( w w) dietary clofibrate, a peroxisome proliferator, for 14 days induced microsomal carboxylesterase activities for five substrates including malathion, clofibrate, diethylsuccinate, diethylphthalate, and p-nitrophenylacetate in liver and kidney of male Swiss-Webster mice and Sprague-Dawley rats. The induction was substrate, tissue, and species dependent. The carboxylesterase activity was induced in mouse from 1.2- to 2.2-fold (liver) and from 1.1- to 1.7-fold (kidney) depending upon substrate used. Analogous values from rat ranged from 1.0- to 1.4-fold (liver) and from 1.1- to 1.8-fold (kidney). Enzyme activities were either decreased or not affected in testes of treated mice and rats. Substituted trifluoroketones ("transition-state" inhibitors of carboxylesterase) were found to be very potent inhibitors of clofibrate-metabolizing carboxylesterase(s) and to be potentially useful in distinguishing among isozymes. The inhibition data suggested that changes in carboxylesterase activity following clofibrate treatment were both qualitative and quantitative.

Original languageEnglish (US)
Pages (from-to)361-369
Number of pages9
JournalToxicology and Applied Pharmacology
Volume89
Issue number3
DOIs
StatePublished - 1987

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Clofibrate
Carboxylesterase
Rats
Tissue
Liver
Kidney
Substrates
Peroxisome Proliferators
Malathion
Enzyme activity
Isoenzymes
Sprague Dawley Rats
Testis
Enzymes

ASJC Scopus subject areas

  • Pharmacology
  • Toxicology

Cite this

Apparent induction of microsomal carboxylesterase activities in tissues of clofibrate-fed mice and rats. / Ashour, Mohamed Bassem A; Moody, David E.; Hammock, Bruce D.

In: Toxicology and Applied Pharmacology, Vol. 89, No. 3, 1987, p. 361-369.

Research output: Contribution to journalArticle

Ashour, Mohamed Bassem A ; Moody, David E. ; Hammock, Bruce D. / Apparent induction of microsomal carboxylesterase activities in tissues of clofibrate-fed mice and rats. In: Toxicology and Applied Pharmacology. 1987 ; Vol. 89, No. 3. pp. 361-369.
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