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Oxidatively modified low-density lipoprotein (OxLDL) is present in atherosclerotic lesions and has been proposed to play an important role in atherogenesis. Thrombosis is the major mechanism underlying acute complications of atherosclerosis. In the present study, we analyzed the interaction between OxLDL and blood coagulation factors, which are involved in the blood coagulation pathway. We investigated the effect of OxLDL on plasma coagulation by measuring prothrombin time (PT) as a parameter of the extrinsic pathway of blood coagulation and activated partial thromboplastin time (APTT) as a parameter of the intrinsic pathway of blood coagulation following the addition of OxLDL to plasma. OxLDL, but not native LDL, caused prolongation of APTT in a dose- and oxidation time-dependent manner. In addition, the oxidatively modified product of acetylated LDL (AcLDL), but not AcLDL, also caused prolongation of APTT. The inhibition of lysophosphatidylcholine production in OxLDL by phenylmethylsulfonyl fluoride or Pefabloc pretreatment of LDL resulted in a prolongation of APTT, which was equivalent to the effect of OxLDL. Moreover, OxLDL significantly inhibited blood coagulation factor VIII, IX, and XI activity. Furthermore, we demonstrated that recombinant factor VIII binds to OxLDL and that factor VIII associated with OxLDL is detected in the incubation mixture of OxLDL and plasma. These results indicate that the binding of factor VIII to OxLDL affects the intrinsic pathway of the blood coagulation cascade. The present study suggests that the interaction between OxLDL and factor VIII may provide important information on the initiation and progression of atherosclerosis.

Inhibition of Plasma Coagulation through Interaction between Oxidized Low-Density Lipoprotein and Blood Coagulation Factor VIII