AMPHIPHILE-INDUCED ANTIHAEMOLYSIS IS NOT CAUSALLY RELATED TO SHAPE CHANGES AND VESICULATION

被引:43
作者
HAGERSTRAND, H
ISOMAA, B
机构
[1] Department of Biology, Åbo Akademi University
关键词
ANTIHAEMOLYSIS; VESICLE RELEASE; SHAPE ALTERATION; AMPHIPHILE; DETERGENT; ERYTHROCYTE;
D O I
10.1016/0009-2797(91)90113-L
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
A wide variety of structurally different antihaemolytic amphiphiles were tested for their ability to induce exovesiculation (acetylcholinesterase (AChE) release, transmission electron microscopic (TEM) studies), endovesiculation (fluorescein isothiocyanate conjugated dextran (FITC-dextran) internalization, TEM studies) and shape changes in human erythrocytes at concentrations where they exert maximum protection against hypotonic haemolysis. The results show that vesiculation is a common phenomenon induced by amphiphiles in erythrocytes. Sphero-echinocytogenic amphiphiles induced exovesiculation, whereas stomatocytogenic amphiphiles induced endovesiculation. The antihaemolytic potency of the amphiphiles was not related to their ability to induce exo- or endovesiculation, or to the type or extent of shape changes induced, and it could not be ascribed to any molecular feature of the amphiphiles or to their charge. It is proposed that amphiphiles, when intercalated into the lipid bilayer of the membrane, rapidly induce rearrangements within the bilayer and that these rearrangements are associated with an increase in the permeability of the membrane; it is suggested that a rapid efflux of ions decreases the difference in osmotic pressure between cell interior and hypotonic buffer, thereby protecting cells from being lysed.
引用
收藏
页码:335 / 347
页数:13
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