Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2001; 86(06): 1440-1448
DOI: 10.1055/s-0037-1616747

Review Article

Schattauer GmbH

Experimental Arterial Thrombosis in Genetically or Diet Induced Hyperlipidemia in Rats

Role of Vitamin K-dependent Clotting Factors and Prevention by Low-intensity Oral Anticoagulation^[*]

Amalia De Curtis

¹“Angela Valenti” Laboratory of Genetic and Environmental Risk Factors for Thrombotic Disease

,

Maria Cristina D’Adamo

²Unit of Potassium Channel Physiopathology, Department of Vascular Medicine and Pharmacology

,

Concetta Amore

¹“Angela Valenti” Laboratory of Genetic and Environmental Risk Factors for Thrombotic Disease

,

Roman Polishchuck

³Unit of Morphology, Department of Cell Biology and Oncology, Istituto di Ricerche Farmacologiche Mario Negri, Consorzio Mario Negri Sud, Santa Maria Imbaro, Italy

,

Augusto Di Castelnuovo

¹“Angela Valenti” Laboratory of Genetic and Environmental Risk Factors for Thrombotic Disease

,

Maria Benedetta Donati

¹“Angela Valenti” Laboratory of Genetic and Environmental Risk Factors for Thrombotic Disease

,

Licia Iacoviello

¹“Angela Valenti” Laboratory of Genetic and Environmental Risk Factors for Thrombotic Disease

› Author Affiliations

Summary

To investigate the relationship among lipids, coagulation and thrombosis in the absence of atherosclerosis, spontaneous or dietary-induced hyperlipidemic (FHL) rats were studied. FHL showed higher levels of coagulation factors VII, IX, X, VIII and XII and a shortening of the occlusion time (OT) of an artificial arterial prosthesis as compared with normolipidemic (FNL) animals. Damage of abdominal aorta of FHL was followed by increased fibrin deposition in the vascular intima as compared to FNL. After 5 months of cholesterol-rich diet FNL showed increased cholesterol, triglycerides and factor II, VII, IX, X, XII levels. A significant shortening of the OT and increased fibrin deposition was also observed. Two-month diet withdrawal restored the initial condition. Warfarin treatment, at a dose decreasing vitamin K-dependent factor to levels found in FNL, prolonged the OT and reduced fibrin deposition, without modifying F XII or changing lipid profile. An increase in the activated form of F VII was observed. In contrast, no difference was found in F VII clearance. High lipid levels favour the process of thrombus formation by increasing the activation of vitamin K-dependent coagulation factors. Low-dose warfarin treatment reverts the prothrombotic effect of hyper-lipidemia.

Keywords

Keywords

Lipids - arterial thrombosis - coagulation factors - rats

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