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PMID: 1058468 Published · ppublish English Journal Article Research Support, U.S. Gov't, Non-P.H.S.

Antigen mobility in membranes and complement-medical immune attack.

Humphires GM, McConnell HM

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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Article Info
Journal
Proceedings of the National Academy of Sciences of the United States of America
Abbr.
Proc Natl Acad Sci U S A
ISSN
0027-8424
Published
1975-07-00
Pages
2483-7
Language
English
Region
United States
NLM ID
7505876
PMCID
PMC432791
Subset
IM
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