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          Institute: MPI für Biochemie     Collection: Molecular Medicine (R. Fässler)     Display Documents

ID: 41771.0, MPI für Biochemie / Molecular Medicine (R. Fässler)
Plasma fibronectin promotes thrombus growth and stability in injured arterioles
Authors:Ni, H. Y.; Yuen, P. S. T.; Papalia, J. M.; Trevithick, J. E.; Sakai, T.; Fässler, R.; Hynes, R. O.; Wagner, D. D.
Date of Publication (YYYY-MM-DD):2003-03-04
Title of Journal:Proceedings of the National Academy of Sciences of the United States of America
Journal Abbrev.:Proc. Natl. Acad. Sci. U. S. A.
Issue / Number:5
Start Page:2415
End Page:2419
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:Mice lacking both of the best-known platelet ligands, von Willebrand factor and fibrinogen, can still form occlusive thrombi in injured arterioles. The platelets of these animals accumulate excessive amounts of fibronectin (FN). These observations led us to examine the contribution of plasma FN (pFN) to thrombus formation. Inactivation of the FN gene in FN conditional knockout mice reduced pFN levels to <2% and platelet FN to approximate to20% of the levels in similarly treated control mice. The mice were then observed in a model of arterial injury to evaluate their capacity to form thrombi. The deficiency of pFN did not affect the initial platelet adhesion, but a delay of several minutes in thrombus formation was observed in the arterioles of pFN-deficient mice as compared with control mice. The thrombi that formed in the absence of pFN were stably anchored to the vessel wall but continuously shed platelets or small platelet clumps, thus slowing their growth significantly; the platelet/platelet cohesion was apparently diminished. Consequently the occlusion of pFN- deficient vessels was delayed, with the majority of vessels remaining patent at the end of the 40-min observation period. We conclude that, in addition to von Willebrand factor and fibrinogen, FN plays a significant role in thrombus initiation, growth, and stability at arterial shear rates and that deficiency in each of the three platelet ligands has its own specific impact on platelet plug formation.
Comment of the Author/Creator:Date: 2003, MAR 4
External Publication Status:published
Document Type:Article
Communicated by:N.N.
Affiliations:MPI für Biochemie/Molecular Medicine (R. Fässler)
External Affiliations:Harvard Univ, Sch Med, Ctr Blood Res, Boston, MA 02115 USA; Harvard Univ, Sch Med, Ctr Blood Res, Boston, MA 02115 USA; Harvard Univ, Sch Med, Dept Pathol, Boston, MA 02115 USA; MIT, Howard Hughes Med Inst, Ctr Canc Res, Dept Biol, Cambridge, MA 02139 USA
Identifiers:ISI:000181365000047 [ID No:1]
ISSN:0027-8424 [ID No:2]
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