Document Detail

Redirection of arachidonic acid metabolism by ICI D1542: effects on thrombus formation in the coronary artery of the anaesthetized dog.
MedLine Citation:
PMID:  8485629     Owner:  NLM     Status:  MEDLINE    
1. The effects of simultaneous redirection of arachidonic acid metabolism, by inhibition of thromboxane A2 (TXA2) synthase and blockade of the platelet thromboxane A2 receptor (TP-receptor), was examined on the rate of thrombus formation in a stenosed coronary artery with damaged endothelium in an anaesthetized dog. 2. Redirection of arachidonic acid metabolism was achieved by intravenous doses of ICI D1542, a selective and potent inhibitor of TXA2 synthase and the TP-receptor. 3. Redirection of arachidonic acid metabolism was demonstrated in whole blood, stimulated ex vivo by collagen. The ED50 for inhibition of TXB2 production was 7.1 micrograms kg-1, i.v.; there were corresponding increases in the production of the eicosanoids prostaglandin D2 (PGD2), PGE2 and PGF2 alpha. 4. Thrombus formation was inhibited by D1542 (ED50 0.55 micrograms kg-1, i.v.), but could be restarted by an intravenous infusion of adrenaline (0.2-38 micrograms kg-1 min-1, i.v.). In the presence of the maximum effective dose of D1542 (1 mg kg-1, i.v.) a 190 fold increase in the infusion rate of adrenaline was required to restore thrombus formation. 5. In the presence of D1542, removal of endoperoxide metabolites by inhibition of cyclo-oxygenase with aspirin (5 mg kg-1, i.v.) caused thrombus formation to restart, indicating the ability of the endoperoxide metabolites to inhibit thrombus formation in vivo. 6. These results indicate that, in the stenosed and damaged coronary artery of the dog, redirection of arachidonic acid metabolism by D1542 is more effective at preventing thrombus formation than inhibition of cyclo-oxygenase by aspirin.
S J McAuliffe; J A Moors; H M Snow; M Wayne; R Jessup
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  British journal of pharmacology     Volume:  108     ISSN:  0007-1188     ISO Abbreviation:  Br. J. Pharmacol.     Publication Date:  1993 Apr 
Date Detail:
Created Date:  1993-06-04     Completed Date:  1993-06-04     Revised Date:  2009-11-18    
Medline Journal Info:
Nlm Unique ID:  7502536     Medline TA:  Br J Pharmacol     Country:  ENGLAND    
Other Details:
Languages:  eng     Pagination:  901-6     Citation Subset:  IM    
ICI Pharmaceuticals, Alderley Park, Macclesfield, Cheshire.
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MeSH Terms
Arachidonic Acid / metabolism*
Aspirin / pharmacology
Blood Platelets / drug effects,  metabolism
Blood Pressure / drug effects
Coronary Circulation / drug effects
Coronary Thrombosis / metabolism*,  physiopathology
Dioxanes / pharmacology*
Dose-Response Relationship, Drug
Endothelium, Vascular / drug effects,  metabolism
Epinephrine / pharmacology
Heart Rate / drug effects
Pyridines / pharmacology*
Receptors, Thromboxane / antagonists & inhibitors,  metabolism
Thromboxane-A Synthase / antagonists & inhibitors
Reg. No./Substance:
0/Dioxanes; 0/Pyridines; 0/Receptors, Thromboxane; 147332-48-7/ICI D1542; 50-78-2/Aspirin; 506-32-1/Arachidonic Acid; 51-43-4/Epinephrine; EC Synthase

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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