Induction of liver microsomal monoxygenases in experimental cholestasis
Zakharova, N.E.; Mordvinov, V.A.; Tsyrlov, I.B.; Liakhovich, V.V.
Biulleten' Eksperimental'noi Biologii i Meditsiny 81(4): 418-420
1976
ISSN/ISBN: 0365-9615 PMID: 1276441 Document Number: 105033
The dependence of expressiveness of microsomal mono-oxygenase induction by phenobarbital upon the amount of binding sites at cytochrome P-450 active center(s) has been studied. The experimental cholestasis is accompanied by accumulation of hydroxylated derivatives of cholesterol, which possess the detergent characteristics and destruct the substrate binding sites in P-450 molecule. The possibility has been demonstrated of phenobarbital induction under conditions when the inducer-monooxygenase primary binding and metabolic steps are not involved. It is assumed that the activation of de novo microsomal protein synthesis is effected by the molecule of phenobarbital itself and not by the products of its primary hydroxylation in the microsomes.