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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2005;25:e123.)
© 2005 American Heart Association, Inc.

Thrombosis

Role of the Intrinsic Coagulation Pathway in Atherogenesis Assessed in Hemophilic Apolipoprotein E Knockout Mice

J. Khallou-Laschet; G. Caligiuri; E. Tupin; A.-T. Gaston; B. Poirier; E. Groyer; D. Urbain; S. Maisnier-Patin; R. Sarkar; S.V. Kaveri; S. Lacroix-Desmazes; A. Nicoletti

From the INSERM U681 (J.K.-L., E.T., A.-T.G., B.P., E.G., S.V.K., S.L.-D., A.N.), UPMC, Institut des Cordeliers, Paris, France; INSERM E00-16 (G.C., D.U.), Faculté de Médecine Necker-Enfants Malades, Paris, France; Departments of Medicine (E.T.) and Bacteriology (S.M.-P.), Karolinska Institutet, Stockholm, Sweden; and Department of Genetics (R.S.), University of Pennsylvania, Philadelphia.

Correspondence to Antonino Nicoletti, INSERM U681, Institut des Cordeliers 15, rue de l’Ecole de Médecine, Paris, France. E-mail antonino.nicoletti{at}u430.bhdc.jussieu.fr

Objective— The contribution of thrombosis and coagulation in atherogenesis is largely unknown. We investigated the contribution of the coagulation intrinsic factor VIII (FVIII)–dependent pathway in atherogenesis.

Methods and Results— Apolipoprotein E and FVIII double–deficient mice (E°/FVIII°) were generated. Aortic root lesions were analyzed in 14-week-old and 22-week-old female mice maintained for 8 or 16 weeks, respectively, on a normal chow diet or a hypercholesterolemic diet.

Conclusion— Despite a higher plasma total cholesterol concentration compared with E° mice, E°/FVIII° mice developed dramatically less early-stage atherosclerotic lesions. Whereas early lesions in E° mice contained abundant fibrin(ogen) deposits on which few platelets adhered, lesions in E°/FVIII° were almost devoid of fibrin(ogen), and no platelets could be detected. The genotype effect on development and composition of lesions tended to decrease with time. This study demonstrates that the activation of the intrinsic pathway of coagulation is potently proatherogenic at the early stage of atherogenesis.

The contribution of coagulation factor VIII (FVIII)–dependent pathway in atherogenesis was addressed in hemophilic apolipoprotein E–deficient mice (E°/FVIII°).

Key Words: atherosclerosis • hemophilia • mouse • knockout

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