Minor Plasma Lipids Modulate Clotting Factor Activities and May Affect Thrombosis Risk

Area of Science:

• Biochemistry
• Hematology
• Metabolomics

Background:

• Minor plasma lipids play a crucial role in regulating thrombin generation.
• Alterations in specific lipids are associated with an increased risk of venous thrombosis.
• Existing knowledge on lipid-clotting factor interactions needs expansion.

Purpose of the Study:

• To investigate the role of plasma lipids in thrombin generation and venous thrombosis.
• To identify specific lipid metabolites associated with venous thrombosis.
• To elucidate the anticoagulant mechanisms of novel lipid compounds.

Main Methods:

• Plasma metabolite profiling was performed on venous thrombosis patients.
• In vitro assays were used to assess the anticoagulant properties of identified lipids.
• Factor Xa inhibition assays were conducted to determine the mechanism of action.

Main Results:

• Decreased plasma long-chain acylcarnitines were associated with venous thrombosis.
• Long-chain acylcarnitines were identified as potent inhibitors of factor Xa.
• Acylcarnitine inhibition of factor Xa does not depend on the Gla-domain.

Conclusions:

• Alterations in lipid metabolism and the lipidome can influence blood coagulation.
• Imbalances between procoagulant and anticoagulant lipids may increase thrombosis risk.
• Long-chain acylcarnitines represent a novel class of anticoagulants targeting factor Xa.