Inhibition of tumor cell-induced platelet aggregation and lung metastasis by the oral GpIIb/IIIa antagonist XV454

Ali Amirkhosravi; Shaker A. Mousa; Mildred Amaya; Susan Blaydes; Hina Desai; Todd Meyer; John L. Francis

doi:10.1160/TH03-02-0102

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2003; 90(03): 549-554
DOI: 10.1160/TH03-02-0102

Cellular Proteolysis and Oncology

Schattauer GmbH

Inhibition of tumor cell-induced platelet aggregation and lung metastasis by the oral GpIIb/IIIa antagonist XV454

Ali Amirkhosravi

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

Shaker A. Mousa

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

Mildred Amaya

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

Susan Blaydes

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

Hina Desai

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

Todd Meyer

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

,

John L. Francis

¹Clinical and Research Laboratories, Florida Hospital Cancer Institute, Orlando, Florida, USA Albany College of Pharmacy, Albany, New York, USA

› Author Affiliations

Abstract

Summary

Platelets are known to play a role in blood borne metastasis. Previous experimental studies have suggested that platelet GpIIb/IIIa may be a therapeutic target. However, the need for intravenous administration limits the potential application of current GpIIb/IIIa inhibitors to cancer therapy. The aim of the present study was to assess the efficacy of a novel, non-peptide oral GpIIb/IIIa antagonist (XV454) on tumor cell-induced platelet aggregation in vivo and on experimental metastasis. A Lewis lung carcinoma (LL2) mouse model of experimental metastasis was used in this study. XV454 (100 μg) was administered intravenously (via tail vein) or orally (gavages) to 20 g mice. To determine the effect of XV454 on platelet aggregation, blood samples were collected by cardiac puncture 10 minutes after intravenous and 1-24 hrs after oral XV454, and platelet function was assessed by aggregometry, thrombelastography and the Platelet Function Analyzer (PFA100^®). The effect of XV454 on tumor cell-induced thrombocytopenia was determined 10 minutes after intravenous and 3 hrs after oral XV454 administration. Tumor cells (2 x 10⁶) were injected intravenously and 15 minutes after cell injection, platelet count was measured and compared to baseline (pre-injection) counts. To assess the effect on metastasis, XV454 was administered intravenous or orally 10 minutes and 3 hrs before tumor cell injection, respectively. Eighteen days later, surface lung tumor nodules were counted and the total lung tumor burden assessed. In a fourth group, in addition to the initial oral dose (before tumor cell injection), oral XV454 was given daily for the first week and three times in the second week. Administration of XV454 (5 mg/kg) completely inhibited platelet aggregation and this effect persisted for at least 24 hrs after oral delivery. Both intravenous and oral XV454 significantly inhibited tumor cell-induced thrombocytopenia (P<0.01), the number of surface lung tumor nodules (80-85%; P<0.001) and total tumor burden (83% for intravenous group; 50% oral [single treatment] group; 91% oral [multiple treatment] group, P<0.001). Overall, these data provide further evidence for the effect of oral and intravenous GpIIb/IIIa antagonism on tumor cell-platelet interaction and metastasis.

Keywords

Platelet GpIIb/IIIa antagonists - platelet-tumor interaction - metastasis - thrombosis - cancer

Full Text

References

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