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Blood, Vol. 93 No. 11 (June 1), 1999:
pp. 3798-3802
von Willebrand Factor Proteolysis Is Deficient in Classic, but not in
Bone Marrow Transplantation-Associated, Thrombotic Thrombocytopenic
Purpura
R. Martijn van der Plas,
Marion E. Schiphorst,
Eric G. Huizinga,
Ronald J. Hené,
Leo F. Verdonck,
Jan J. Sixma, and
Rob Fijnheer
From the Thrombosis and Haemostasis Laboratory, Department of
Haematology, Institute of Biomembranes, University Medical Centre
Utrecht, Utrecht, The Netherlands.
Thrombotic thrombocytopenic purpura (TTP) after bone marrow
transplantation (BMT) differs from classic TTP in its clinical course
and therapy. A characteristic of classic TTP is the inhibition of a
plasma protease that specifically cleaves von Willebrand factor (vWF),
thus reducing its multimeric size. We investigated whether this
protease was also inhibited in BMT-associated TTP. Plasma from patients
with classic or BMT-associated TTP was incubated with recombinant vWF
R834Q, a vWF mutant with enhanced sensitivity to the protease. The
proteolysis of vWF multimers was analyzed and quantified on Western
blot. Metalloprotease activity was strongly inhibited in the classic
TTP patient group. However, metalloprotease activity was normal in the
BMT-associated TTP patient group. The difference in activity between
the two patient groups was highly significant (P = .0016).
The results indicate that the etiologies of classic and BMT-associated
TTP are indeed different and provide an explanation for the lack of
success of plasma exchange in BMT-associated TTP.

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