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Blood, 1 July 2004, Vol. 104, No. 1, pp. 100-106.
Prepublished online as a Blood First Edition Paper on March 16, 2004; DOI 10.1182/blood-2004-01-0107.
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HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY
Effects of inflammatory cytokines on the release and cleavage of the endothelial cell–derived ultralarge von Willebrand factor multimers under flow
Aubrey Bernardo,
Chalmette Ball,
Leticia Nolasco,
Joel F. Moake, and
Jing-fei Dong
From the Thrombosis Research Section, Department of Medicine, Baylor College of Medicine, Houston, TX.
ADAMTS13 cleaves ultralarge and hyperreactive von Willebrand factor (ULVWF) freshly released from activated endothelial cells to smaller and less active forms. This process may be affected by the amount of ULVWF released and the processing capacity of ADAMTS13, contributing to the development of thrombotic diseases. We examined the effects of inflammatory cytokines on the release and cleavage of ULVWF to evaluate potential links between inflammation and thrombosis. Human umbilical vein endothelial cells were treated with interleukin 6 (IL-6), IL-8, or tumor necrosis factor  (TNF-), and the formation of platelet-decorated ULVWF strings was quantitated. IL-8 and TNF- significantly stimulated the release of ULVWF in a dose-dependent manner. IL-6 induced ULVWF release only when it was in complex with the soluble IL-6 receptor. IL-6, but not IL-8 nor TNF-, inhibited the cleavage of ULVWF strings by ADAMTS13 under flowing, but not static, conditions. These results suggest that inflammatory cytokines may stimulate the ULVWF release (IL-8 and TNF-) and inhibit the ULVWF cleavage (IL-6), resulting in the accumulation of hyperreactive ULVWF in plasma and on the surface of endothelial cells to induce platelet aggregation and adhesion on the vascular endothelium. The findings describe a potential linkage between inflammation and thrombosis that may be of therapeutic importance.
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