Semin Thromb Hemost 2005; 31(6): 641-651
DOI: 10.1055/s-2005-925470
Copyright © 2005 by Thieme Medical Publishers, Inc., 333 Seventh Avenue, New York, NY 10001, USA.

The Changing Paradigm of Thrombotic Thrombocytopenic Purpura

Thomas J. Raife1
  • 1Associate Professor, Department of Pathology, University of Iowa College of Medicine, Iowa City, Iowa
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Publication History

Publication Date:
30 December 2005 (online)

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ABSTRACT

New discoveries have changed a 20-year-old concept about the mechanism of microvascular thrombosis in thrombotic thrombocytopenic purpura (TTP). The classic model of TTP pathogenesis in which ultralarge von Willebrand factor (ULvWF) is proposed to mediate spontaneous platelet aggregation in high sheer stress has evolved into a model in which vWF-platelet aggregates form on stimulated endothelial cell surfaces. The classic model of TTP pathogenesis was based on the proposed pathogenicity of plasma ULvWF in TTP microvascular thrombosis. The current model suggests that platelet binding to endothelial-bound vWF and cleavage of endothelial-bound vWF-platelet aggregates may be most critical in TTP pathogenesis and treatment. A clearer understanding of the mechanism of microvascular thrombosis in TTP will allow better targeted treatment.

REFERENCES

Thomas J RaifeM.D. 

Department of Pathology, University of Iowa College of Medicine

C250 GH, 200 Hawkins Drive, Iowa City, IA 52242

Email: Thomas-raife@uiowa.edu