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Effects of SolCD39, a Novel Inhibitor of Platelet Aggregation, on Platelet Deposition and Aggregation after PTCA in a Porcine Model

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Abstract

Introduction: This study evaluated CD39 in a porcine model of balloon angioplasty and in plasma of patients undergoing percutaneous intervention. CD39 (E-NTPDase1), is the endothelial ecto-ADPase inhibiting platelet function via hydrolysis of released platelet ADP.

Methods and Results: A recombinant soluble form of CD39 (solCD39) given intravenously to pigs had an elimination half life of 5–7 days, increased the bleeding time to an extent similar to aspirin, and inhibits platelet aggregation by > 90%. Platelet counts and clot retraction remained normal following solCD39 administration. In a pig model of acute coronary balloon injury, solCD39 resulted in non-statistically significant decreases in platelet (7.7 ± 1.4 versus 11.7 ± 3.4) and fibrin (3.5 ± 0.4 versus 4.2 ± 0.7) deposition ratios. Adding ex vivo to human platelet rich plasma (PRP) solCD39 produced nearly 100% inhibition of ADP-induced platelet aggregation. A dose-response effect of solCD39 on platelet aggregation induced by collagen or a thrombin receptor activating peptide (TRAPSFLLRN) was noted in PRP obtained from volunteers and patients receiving aspirin, clopidogrel or ticlopidine. SolCD39 also provided additional and complete inhibition of TRAP-induced platelet aggregation in PRP from patients who had received abciximab, aspirin and clopidogrel.

Conclusions: SolCD39, a novel inhibitor of platelet activation and recruitment with a relatively long half-life appears to be well tolerated and is a potent inhibitor of ADP-, collagen-, or TRAP-induced platelet activation. Its potential use in percutaneous coronary intervention requires further study.

Abbreviated Abstract. E-NTPDase1/CD39 is the endothelial ecto-ADPase responsible for inhibition of platelet function. A recombinant soluble form (solCD39) had an elimination half life of 5–7 days in pigs, elevated bleeding times similar to aspirin, did not affect clot retraction, and inhibited platelet aggregation by > 90%. When combined with standard heparin therapy in a pig model of acute coronary balloon injury, solCD39 resulted in a trend toward a decrease in platelet and fibrin deposition. SolCD39 added ex vivo to human platelet rich plasma yielded nearly 100% inhibition of ADP-induced platelet aggregation and provided further inhibition when combined with standard therapy.

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Correspondence to John M. Buergler MD.

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Supported in part by a Merit Review grant from the Department of Veterans Affairs (A.J.M., M.J.B.), and by National Institutes of Health grants HL 47073, HL 46403, and NS 41462 (A.J.M., M.J.B.) and by Immunex Corp., Seattle, WA.

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Buergler, J.M., Maliszewski, C.R., Broekman, M.J. et al. Effects of SolCD39, a Novel Inhibitor of Platelet Aggregation, on Platelet Deposition and Aggregation after PTCA in a Porcine Model. J Thromb Thrombolysis 19, 115–122 (2005). https://doi.org/10.1007/s11239-005-1381-y

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  • DOI: https://doi.org/10.1007/s11239-005-1381-y

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