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Farnesol as an inhibitor and substrate for rabbit liver microsomal P450 enzymes

UNCG Author/Contributor (non-UNCG co-authors, if there are any, appear on document)
Gregory M. Raner, Associate Professor and Graduate Director (Creator)
Institution
The University of North Carolina at Greensboro (UNCG )
Web Site: http://library.uncg.edu/

Abstract: Farnesol and the related isoprenoids, geranylgeraniol, geranylgeranyl pyrophosphate, and farnesyl pyrophosphate, are produced in the endoplasmic reticulum of hepatocytes in mammals, and each serve important biological functions. Of these compounds, only farnesol was shown to significantly inhibit rabbit liver microsomal cytochrome P450 enzymes. The observed inhibition appeared to be reversible, and was not strictly competitive, but rather mixed in nature. Of the activities examined, ethoxycoumarin de-ethylase and diclofenac-4-hydroxylase activities were most sensitive to farnesol, with KI and K’I values between 11 and 40 µM. Caffeine-8-hydroxylation and taxol-6-hydroxylation were not inhibited at all by farnesol. Farnesol appeared to be a P450 substrate, as well as an inhibitor, as indicated by the NADPH-dependent decrease in farnesol concentration in microsomal incubations, and the metabolism was inhibited by CO, which pointed to the involvement of P450 isozymes.

Additional Information

Publication
Biochemical and Biophysical Research Communication 293, 1-6 (2002).
Language: English
Date: 2002
Keywords
Rabbit liver, Cytochrome P450, Isoprenoids, Farnesol, Inhibitors