Food restriction prevents the loss of isosafrole inducible cytochrome P-450 mRNA and enzyme levels in aging rats

J. G.J.M. Horbach, J. T. Venkatraman, G. Fernandes

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6 Scopus citations


The influence of food restriction (FR) on the drug-inducible capacity of liver microsomal cytochrome P-450s IA1,IA2 and IIB1 and IIB2 was studied in 20-month-old male Fischer-344 rats. ELISA and Western Blotting revealed that the induction of the cytochrome P-450-IA1/IA2 and P-450-IIB1/IIB2 enzymes was considerably higher in the liver microsomes of FR rats than in their ad libitum (AL) fed counterparts. In order to determine whether the higher P-450 enzyme levels in FR rats were a reflection of an increased synthesis rate or a stabilization of these enzymes, hybridization studies were performed with a cDNA probe for P-450-IIB1/1IIB2. These studies show markedly higher levels of P-450-IIB1/IIB2 mRNAs in the livers of FR rats as compared to AL animals. These results suggest that it is possible to prevent the age-dependent loss of drug-induced cytochrome P-450s by 40% dietary restriction which suggest FR may improve the drug-metabolizing capacity during aging.

Original languageEnglish (US)
Pages (from-to)725-730
Number of pages6
JournalBiochemistry International
Issue number4
StatePublished - May 4 1990


ASJC Scopus subject areas

  • Biochemistry

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