Thromb Haemost 2001; 85(03): 521-528
DOI: 10.1055/s-0037-1615615
Review Article
Schattauer GmbH

Antiplatelet and Antithrombotic Activity of SL65.0472, a Mixed 5-HT1B/5-HT2A Receptor Antagonist

Christopher N. Berry
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Janine Lorrain
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Sylvette Lochot
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Monique Delahaye
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Alain Lalé
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Pierre Savi
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Irène Lechaire
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Patrice Ferrari
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
André Bernat
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Paul Schaeffer
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Philippe Janiak
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Nicole Duval
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Alain Grosset
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Jean-Marc Herbert
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
,
Stephen E. O’Connor
1   Cardiovascular/Thrombosis Department, Sanofi~Synthélabo, Chilly Mazarin, and Toulouse, France
› Author Affiliations
Further Information

Publication History

Received 15 June 2000

Accepted after resubmission 11 October 2000

Publication Date:
08 December 2017 (online)

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Summary

The antiplatelet and antithrombotic activity of SL65.0472 (7-fluoro-2-oxo-4-[2-[4-(thieno [3,2-c]pyrin-4-yl) piperazin-1-yl]ethyl]-1,2-dihydroquinoline-acetamide), a mixed 5-HT1B/5-HT2A receptor antagonist was investigated on 5HT-induced human platelet activation in vitro, and in rat, rabbit and canine platelet dependent thrombosis models. SL65.0472 inhibited 5-HT-induced platelet shape change in the presence of EDTA (IC50 values = 35, 69 and 225 nM in rabbit, rat and human platelet rich plasma (PRP)), and also inhibited aggregation induced in human PRP by 3-5 μM 5-HT + threshold concentrations of ADP (0.5-1 M) or collagen (0.3 g/ml) with mean IC50 values of 49 ± 13 and 48 ± 6 nM respectively. SL65.0472 inhibited thrombus formation when given both intravenously 5 min and orally 2 h prior to assembly of an arterio-venous (A-V) shunt in rats as from 0.1 and 0.3 mg/kg respectively. It was active in a rabbit A-V shunt model with significant decreases in thrombus weight as from 0.1 mg/kg i. v. and at 10 mg/kg p. o. The delay to occlusion in an electric current-induced rabbit femoral artery thrombosis model was increased by 251% (p <0.05) after 20 mg/kg p. o. SL65.0472 (30 μg/kg i. v.) virtually abolished coronary cyclic flow variations (7.2 ± 1.0/h to 0.6 ± 0.6/h, p <0.05) and increased minimum coronary blood flow (1.2 ± 0.8 ml/ min to 31.8 ± 8.4 ml/min, p <0.05) in a coronary artery thrombosis model in the anaesthetised dog. Finally, SL65.0472 significantly increased the amount of blood lost after rat tail transection at 3 mg/kg p. o. Thus the anti-5-HT2A component of SL65.0472 is reflected by its ability to inhibit 5-HT-induced platelet activation, and platelet-rich thrombus formation.