Sex-dependent differences in the effects of portacaval anastomosis on hepatic monooxygenases in rats

Hirokata Yoichiro, Samuel Tong, Zahid H. Siddik, Michael A. Trush, Edward G. Mimnaugh, Theodore E. Gram

Research output: Contribution to journalArticle

Abstract

Previous work revealed that portacaval anastomosis (PCA) in rats results in hepatic atrophy and marked decreases in components of the microsomal monooxygenase system such as cytochrome P-450. In the present study, the effects of PCA on hepatic monooxygenase activity were studied in more detail. We report that PCA, in general, produces effects resembling those of castration. Thus, in male rats, PCA depressed the activity of highly sex-dependent enzymes such as ethylmorphine and aminopyrine demethylases. Similar effects were produced by castration, and the combination of PCA and castration produced the same effect as either treatment alone. In male rats, non-sex-dependent enzymes such as aniline hydroxylase and NADPH-cytochrome c reductase were unaffected by either PCA or castration. By contrast, in female rats, neither PCA nor castration significantly affected microsomal monooxygenase activities. In male rats, PCA was accompanied by a 75% reduction in serum testosterone levels and a 6-fold increase in total estrogen levels. We conclude that these effects of PCA in male rats were due, in large measure, to a demasculinizing effect.

Original languageEnglish (US)
Pages (from-to)499-502
Number of pages4
JournalBiochemical Pharmacology
Volume31
Issue number4
DOIs
StatePublished - Feb 15 1982
Externally publishedYes

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Surgical Portacaval Shunt
Mixed Function Oxygenases
Sex Characteristics
Rats
Castration
Liver
Aryl Hydrocarbon Hydroxylases
Ethylmorphine
Aniline Hydroxylase
Aminopyrine
NADPH-Ferrihemoprotein Reductase
Enzymes
Cytochrome P-450 Enzyme System
Testosterone
Estrogens
Atrophy

ASJC Scopus subject areas

  • Pharmacology

Cite this

Yoichiro, H., Tong, S., Siddik, Z. H., Trush, M. A., Mimnaugh, E. G., & Gram, T. E. (1982). Sex-dependent differences in the effects of portacaval anastomosis on hepatic monooxygenases in rats. Biochemical Pharmacology, 31(4), 499-502. https://doi.org/10.1016/0006-2952(82)90150-2

Sex-dependent differences in the effects of portacaval anastomosis on hepatic monooxygenases in rats. / Yoichiro, Hirokata; Tong, Samuel; Siddik, Zahid H.; Trush, Michael A.; Mimnaugh, Edward G.; Gram, Theodore E.

In: Biochemical Pharmacology, Vol. 31, No. 4, 15.02.1982, p. 499-502.

Research output: Contribution to journalArticle

Yoichiro, Hirokata ; Tong, Samuel ; Siddik, Zahid H. ; Trush, Michael A. ; Mimnaugh, Edward G. ; Gram, Theodore E. / Sex-dependent differences in the effects of portacaval anastomosis on hepatic monooxygenases in rats. In: Biochemical Pharmacology. 1982 ; Vol. 31, No. 4. pp. 499-502.
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