Effect of incorporation and removal of cholesterol on the lipid bilayer viscosity and the rate of oxidative reactions in rat liver microsomal membranes

Borodin, E.A.; Dobretsov, G.E.; Karasevich, E.I.; Karuzina, I.I.; Kariakin, A.V.

Biokhimiia 46(6): 1109-1118

1981


ISSN/ISBN: 0320-9725
PMID: 7260196
Document Number: 181794
The interrelationship between the lipid bilayer viscosity and the rate of oxidative reactions in rat liver microsomal membranes were investigated. The viscosity of the lipid bilayer is increased upon incorporation of cholesterol into the microsomes and is decreased upon its removal. This results in a corresponding decrease and increase of the rate of cytochrome b5 reduction by NAD(P)H. The rates of cytochrome P-450 reduction and oxidation of dimethylaniline, aniline, p-nitroanisol and NAD(P)H, as well as those of oxygen uptake and lipid peroxidation do not depend on the bilayer viscosity. Hence only the reactions of cytochrome b5 reduction by NADH- and NADPH-specific flavoproteins are diffusion-dependent processes in the microsomal oxidation chain.

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