Thromb Haemost 2008; 99(02): 343-351
DOI: 10.1160/TH07-10-0608
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Prophylactic P-selectin inhibition with PSI-421 promotes resolution of venous thrombosis without anticoagulation

Thomas R. Meier*
1   University of Michigan Medical Center, Section of Vascular Surgery
2   Unit for Laboratory Animal Medicine
,
Daniel D. Myers Jr
1   University of Michigan Medical Center, Section of Vascular Surgery
2   Unit for Laboratory Animal Medicine
,
Shirley K. Wrobleski
1   University of Michigan Medical Center, Section of Vascular Surgery
,
Paul J. Zajkowski
1   University of Michigan Medical Center, Section of Vascular Surgery
,
Angela E. Hawley
1   University of Michigan Medical Center, Section of Vascular Surgery
,
Patricia W. Bedard
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Nicole E. Ballard
1   University of Michigan Medical Center, Section of Vascular Surgery
,
Frank J. Londy
3   Department of Radiology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
,
Neelu Kaila
4   Wyeth Research, Cambridge, Massachussetts, USA
,
George P. Vlasuk
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Robert G. Schaub**
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Thomas W. Wakefield
1   University of Michigan Medical Center, Section of Vascular Surgery
› Institutsangaben

Financial support: This work supported by NIH/NCRR T32-RR07008-29 (to TRM), and Wyeth Research.
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Publikationsverlauf

Received: 12. Oktober 2007

Accepted after major revision: 05. Januar 2007

Publikationsdatum:
24. November 2017 (online)

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Summary

P-selectin inhibition has been evaluated as a therapeutic for prevention and treatment of venous thrombosis. In this study, a novel oral small-molecule inhibitor of P-selectin, PSI-421, was evaluated in a baboon model of stasis induced deep vein thrombosis (DVT). Experimental groups included i) primates receiving a single oral dose of 1 mg/kg PSI-421 two days prior and continued six days after thrombosis (n=3); ii) primates receiving a single daily subcutaneous dose of 0.57 mg/kg enoxaparin sodium two days prior and continued six days post thrombosis (n=3); and iii) primates receiving no treatment (n=3).PSI-421 treated primates had greater percent vein reopening and less vein wall inflammation than the enoxaparin and controls at day 6. Microparticle tissue factor activity (MPTFA) was significantly lower in the animals receiving PSI-421 immediately after thrombosis (T+6 hours day 0) suggesting lower potential for thrombogenesis in these animals. PSI-421 also reduced soluble P-selectin levels versus controls at T+6 hours day 0, day 2 and 6. Experimental animals in any group showed no adverse effects on coagulation. This study is the first to demonstrate a reduction in MPTFA associated with vein reopening and reduced vein inflammation due to oral P-selectin inhibition in a baboon model of DVT.

* Dr. Thomas R. Meier is currently affiliated with Mayo Clinic, Rochester, MN, USA.


** Dr. Robert G. Schaub is currently affiliated with the Archemix Corp., Cambridge, MA, USA.