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C Pous, JP Giroud, C Damais, D Raichvarg and L Chauvelot-Moachon
Departement de Pharmacologie, CNRS-URA 595, Hopital Cochin, Paris, France.
Two hepatocyte-related effects of recombinant human interleukin-1 beta and tumor necrosis factor alpha alone or in association were tested following iv administration to Fischer 344 rats. Within 24 hr, both monokines induced a dose-dependent decrease in cytochrome P-450 levels, whereas serum alpha-1-acid glycoprotein concentrations were strongly increased. The largest variation of both parameters was observed using a combination of the two monokines. Dexamethasone, which possesses anti- interleukin-1 properties and is known to stimulate alpha-1-acid glycoprotein synthesis in rats, also depressed cytochrome P-450 levels, suggesting that alpha-1-acid glycoprotein might mediate the monokine- related inhibition of drug metabolism. Nevertheless, at the lowest doses of monokines tested, only cytochrome P-450 levels were modified. The transfer of a post-dexamethasone serum to normal rats did not change cytochrome P-450 levels.
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