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Oxidation products of phospholipid-containing delta-9 fatty acids specifically impair the activity of tissue factor

Sayuri Hiraishi1, Shuichi Horie, Yoshiyuki Seyama

  • 1Department of Clinical Molecular Biology, Faculty of Pharmaceutical Sciences, Teikyo University, 1091-1 Suarashi, Sagamiko, Tsukui, Kanagawa 199-0195, Japan.

Biochemical and Biophysical Research Communications
|November 1, 2002
PubMed

Insights

Oxidized phospholipids in ox-LDL impair blood coagulation by reducing tissue factor pathway inhibitor (TFPI) activity. Specifically, oxidized delta-9 unsaturated phospholipids are the key components responsible for this anti-coagulation effect.

Area of Science:

  • Biochemistry
  • Hematology
  • Lipidomics

Background:

  • Oxidized low-density lipoprotein (ox-LDL) plays a role in atherosclerosis.
  • Tissue Factor Pathway Inhibitor (TFPI) is a key regulator of the extrinsic blood coagulation cascade.
  • Understanding the molecular interactions between ox-LDL components and coagulation factors is crucial for cardiovascular research.

Purpose of the Study:

  • To identify the specific components within ox-LDL that inhibit TFPI activity.
  • To elucidate the mechanism by which ox-LDL affects the catalytic function of TFPI.
  • To determine the structural characteristics of phospholipids responsible for TFPI inhibition.

Main Methods:

  • Extraction and separation of active phospholipid fractions from ox-LDL.
  • Incubation of recombinant TFPI (rTFPI) with purified oxidized phospholipids.
  • Assay of TFPI catalytic activity in the presence of various oxidized phospholipid species.
  • Analysis of the interaction between oxidized phospholipids and rTFPI.

Main Results:

  • Oxidation products of 1- and/or 2-oleoyl phosphatidylcholine (PC) and phosphatidylethanolamine were potent inhibitors of TFPI activity.
  • Oxidized phospholipids strongly associated with the carboxyl-terminal domain of rTFPI.
  • Purified oxononanoyl PC (9CHO-PC) and its carboxylic form (9COOH-PC) specifically impaired TFPI catalytic activity.
  • Oxidized arachidonyl PC showed only weak inhibitory effects, while oxovaleroyl PC (5CHO-PC) and lyso-phospholipids did not reduce TFPI activity.

Conclusions:

  • Oxidation products of delta-9 unsaturated phospholipids in lipoproteins are the primary active components that reduce TFPI's anti-coagulation activity.
  • These findings highlight a novel mechanism by which ox-LDL can influence hemostasis and potentially contribute to thrombotic events.
  • Targeting these oxidized phospholipids may offer therapeutic strategies for managing coagulation disorders associated with ox-LDL accumulation.

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