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Membrane fluidity and oxygen diffusion in cholesterol-enriched erythrocyte membrane.

Abstract：

:This work studied the effect of cholesteryl hemisuccinate incorporation on membrane fluidity and on the kinetics of oxygen diffusion at different depths in the erythrocyte membrane. Cholesterol concentration in the membrane was expressed as the cholesterol-protein ratio (C/Pt). The membrane fluidity, as assessed by a fluorescence polarization method with diphenyl-hexatriene and 1-(4-trimethylamino)-6-phenylhexa-1,3,5-triene, decreased as the C/Pt ratio increased. Time-resolved fluorescence spectroscopy of pyrene dodecanoic acid (PDA) under an increasing C/Pt ratio in the erythrocyte membrane revealed enhanced oxygen diffusion in the middle of the membrane bilayer (in which PDA was incorporated), which was not the case with pyrene butyric acid (PBA) incorporated in the internal part of the membrane surface. It has generally been accepted that increased membrane fluidity reduces the physical barrier to oxygen permeation. Such conflicting observations on oxygen permeation in the rigidified erythrocyte membrane could be due to variations in oxygen solubility (preferential partitioning) in different polarity microdomains (cholesterol and phospholipid partitions).

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Dumas D,Muller S,Gouin F,Baros F,Viriot ML,Stoltz JF

doi

10.1006/abbi.1997.9936

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

34-9

issue

1

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(97)99936-7

journal_volume

341

pub_type

杂志文章

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