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Blood, 1 January 2006, Vol. 107, No. 1, pp. 132-134.
Prepublished online as a Blood First Edition Paper on September 13, 2005; DOI 10.1182/blood-2005-07-2681.
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Submitted July 12, 2005
Accepted August 25, 2005
Pivotal role of PAI-1 in a murine model of hepatic vein thrombosis
Layton H Smith, John D Dixon, John R Stringham, Mesut Eren, H Elokdah, Dave L Crandall, Kay Washington, and Douglas E Vaughan*
Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN, USA
Wyeth Research, Collegeville, PA, USA
Departments of Medicine and Pathology, Vanderbilt University Medical Center, Nashville, TN, USA
* Corresponding author; email: doug.vaughan{at}vanderbilt.edu.
Hepatic veno-occlusive disease (VOD) is a common complication of high-dose chemotherapy associated with bone marrow transplantation. While the pathogenesis of VOD is uncertain, plasminogen activator inhibitor-1 (PAI-1) has emerged as a diagnostic marker and predictor of VOD in humans. In this study, we investigated the role of PAI-1 in a murine model of VOD produced by long-term nitric oxide synthase inhibition using L-NAME. After 6 weeks, wild-type (WT) mice developed extensive fibrinoid hepatic venous thrombi and biochemical evidence of hepatic injury and dysfunction. In contrast, PAI-1 deficient mice were largely protected from the development of hepatic vein thrombosis. Furthermore, WT mice that received tiplaxtinin, an antagonist of PAI-1, were effectively protected from L-NAME-induced thrombosis. Taken together, these data indicate that NO and PAI-1 play pivotal and antagonistic roles in hepatic vein thrombosis, and that PAI-1 is a potential target in the prevention and treatment of VOD in humans.

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