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Anionic Phospholipids Lose their Procoagulant Properties when Incorporated into High-Density Lipoproteins.

På svenska

Author

  • Cecilia Oslakovic
  • Michael Krisinger
  • Astra Andersson
  • Matti Jauhiainen
  • Christian Ehnholm
  • Björn Dahlbäck

Summary, in English

Blood coagulation involves a series of enzymatic protein complexes that assemble on the surface of anionic phospholipid. To investigate whether apolipoproteins affect coagulation reactions, they where included during the preparation of anionic phospholipid vesicles using a detergent solubilization-dialysis method. Apolipoprotein components of high-density lipoproteins, especially apolipoprotein A-I, had pronounced anticoagulant effect. The anionic phospholipids lost their procoagulant effect when the vesicle preparation method was performed in the presence of apolipoprotein A-I. The anionic phospholipid-apolipoprotein A-I particles were 8-10 nm in diameter and contained around 60-80 phospholipid molecules, depending on the phospholipid composition. The phospholipids of these particles were unable to support the activation of prothrombin by factor Xa in the presence of factor Va, and unable to support binding of factor Va, while binding of prothrombin and factor Xa were efficient. Phospholipid transfer protein was shown to mediate transfer of phospholipids from liposomes to apolipoprotein A-I containing reconstituted high-density lipoprotein. In addition, serum was also shown to neutralize the procoagulant effect of anionic liposomes and to efficiently mediate transfer of phospholipids from liposomes to either apolipoprotein A-I or apolipoprotein B containing particles. In conclusion, apolipoprotein A-I was found to neutralize the procoagulant properties of anionic phospholipids by arranging the phospholipids in surface areas that are too small to accommodate the prothrombinase complex. This anionic phospholipid scavenger function may be an important mechanism to control the exposure of such phospholipids to circulating blood and thereby prevent inappropriate stimulation of blood coagulation.

Publishing year

2009

Language

English

Pages

5896-5904

Publication/Series

Journal of Biological Chemistry

Volume

284

Issue

9

Document type

Journal article

Publisher

American Society for Biochemistry and Molecular Biology

Topic

  • Medicinal Chemistry

Status

Published

Research group

  • Clinical Chemistry, Malmö

ISBN/ISSN/Other

  • ISSN: 1083-351X