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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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HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Brief report
Pivotal role of PAI-1 in a murine model of hepatic vein thrombosis
Layton H. Smith,
John D. Dixon,
John R. Stringham,
Mesut Eren,
Hassan Elokdah,
Dave L. Crandall,
Kay Washington, and
Douglas E. Vaughan
From the Departments of Medicine and Pathology, Division of Cardiovascular Medicine, Vanderbilt University Medical Center, Nashville, TN; and Wyeth Research, Collegeville, PA.
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-1deficient 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-NAMEinduced 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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