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Thromb Haemost 2007; 97(03): 400-407
DOI: 10.1160/TH06-11-0658
Blood Coagulation, Fibrinolysis and Cellular Haemostasis
Schattauer GmbH

Resolution of venous thrombosis using a novel oral small-molecule inhibitor of P-selectin (PSI-697) without anticoagulation

Daniel D. Myers Jr.
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
2   Unit for Laboratory Animal Medicine
,
Shirley K. Wrobleski
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Chris Longo
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Patricia W. Bedard
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Neelu Kaila
4   Wyeth Research, Cambridge, Massachussetts, USA
,
George D. Shaw
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Frank J. Londy
3   Department of Radiology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
,
Suzan E. Rohrer
3   Department of Radiology, University of Michigan Medical Center, Ann Arbor, Michigan, USA
,
Beverly A. Fex
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Paul J. Zajkowski
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Thomas R. Meier
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
2   Unit for Laboratory Animal Medicine
,
Angela E. Hawley
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Diana M. Farris
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Nicole E. Ballard
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Peter K. Henke
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
,
Robert G. Schaub
4   Wyeth Research, Cambridge, Massachussetts, USA
,
Thomas W. Wakefield
1   Jobst Vascular Research Laboratories, Section of Vascular Surgery
› Author AffiliationsFinancial support: This work was supported by NIH ROI HL 70766 (TWW) and Wyeth Research (PSI-697 compound and partial funding for research supplies).
Further Information

Publication History

Received 22 November 2006

Accepted after revision 02 January 2007

Publication Date:
28 November 2017 (online)

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Summary

P-selectin inhibition has been shown to decrease thrombogenesis in multiple animal species. In this study, we show that a novel oral small-molecule inhibitor of P-selectin, PSI-697, promotes thrombus resolution and decreases inflammation in a baboon model of venous thrombosis. Experimental groups consisted of the following: 1) primates receiving a single oral dose of PSI-697 (30 mg/kg) daily starting three days pre-iliac vein balloon occlusion, and continued for six days; 2) primates receiving a single treatment dose of a low-molecular-weight-heparin (LMVVH) (1.5 mg/kg) daily starting one day pre-iliac balloon occlusion, and continued for six days; and 3) primates receiving a single oral dose of a vehicle control daily starting three days pre-iliac vein balloon occlusion, and continued for six days. Animals receiving PSI-697, although thrombosed after balloon deflation, demonstrated greater than 80% vein lumen opening over time, with no opening (0%) for vehicle control (p<0.01). LMVVH opening evident after balloon deflation slightly deteriorated overtime compared to PSI-697. PSI-697 therapy also significantly decreased vein wall inflammation determined by magnetic resonance venography (MRV). Importantly, this beneficial opening occurred without measured anticoagulation. Animals receiving PSI-697 demonstrated significantly increased plasma D-dimer levels versus LMVVH and control animals six hours post thrombus induction (p<0.01). This study is the first to demonstrate the effectiveness of oral P-selectin inhibition to modify venous thrombogenesis, increase vein lumen opening, and decrease inflammation in a large animal model.

Keywords

Deep venous thrombosis - thrombus resolution - small-molecule inhibitor of p-selectin - inflammation - animal models

Footnote: Presented in part as an oral presentation at The XXth Congress of the International Society on Thrombosis and Haemostasis and 51st Annual SCC Meeting, Tuesday August 9, 2005, Sydney Australia, and the 51st Clinical Meeting of the Frederick A. Coller Surgical Society, Friday October 21, 2005, Santa Barbara, California, USA.


 

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