Abstract
The complement fixing activity of liposomes containing cholesterol, dimyristoylphosphatidylcholine (or dipalmitoylphosphatidylcholine), and 3 mol % of cardiolipin has been studied as a function of cholesterol concentration by use of human syphilitic serum containing cardiolipin-specific (Wasserman) antibodies. It is found that complement fixation increases rapidly for cholesterol concentrations above 35 mol %. Spin label studies have been used to study the incorporation of cardiolipin in the relatively rigid phase of binary mixtures of cholesterol and dimyristolphosphatidycholine (or dipalmitoylphosphatidylcholine). It is concluded that cardiolipin is included in such a phase of these lipids for cholesterol concentrations above 35 mol %. These results indicate that a relatively rigid lateral distribution of this monovalent antigen in the plane of the membrane facilitates complement fixation and concomitant complement-mediated membrane damage.
MeSH Terms
Animals
Antigens
Binding Sites
Cardiolipins/immunology
Cholesterol
Chromatography, Thin Layer
Complement Fixation Tests
Complement System Proteins
Erythrocytes/immunology
Humans
Kinetics
Membranes, Artificial
Models, Biological
Phosphatidylcholines
Rabbits/immunology
Sheep/immunology
Syphilis/immunology
Temperature
Chemicals
Antigens
Cardiolipins
Membranes, Artificial
Phosphatidylcholines
Complement System Proteins
Cholesterol
Authors & Affiliations
2 authors, click to expand affiliations / ORCID
Humphires G M
McConnell H M
References (17)
17 references, click to expand
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