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Titolo:
ADJUNCTIVE SELECTIN BLOCKADE SUCCESSFULLY REDUCES INFARCT SIZE BEYONDTHROMBOLYSIS IN THE ELECTROLYTIC CANINE CORONARY-ARTERY MODEL
Autore:
SILVER MJ; SUTTON JM; HOOK S; LEE P; MALYCKY JL; PHILLIPS ML; ELLIS SG; TOPOL EJ; NICOLINI FA;
Indirizzi:
CLEVELAND CLIN FDN,DEPT CARDIOL F15,JOSEPH J JACOBS CTR THROMBOSIS & VASC BIOL CLEVELAND OH 44195 CLEVELAND CLIN FDN,DEPT CARDIOL F15,JOSEPH J JACOBS CTR THROMBOSIS & VASC BIOL CLEVELAND OH 44195 CYTEL CORP SAN DIEGO CA 92121
Titolo Testata:
Circulation
fascicolo: 3, volume: 92, anno: 1995,
pagine: 492 - 499
SICI:
0009-7322(1995)92:3<492:ASBSRI>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
REPERFUSION-INDUCED ARRHYTHMIAS; MYOCARDIAL NEUTROPHIL ACCUMULATION; IRREVERSIBLE ISCHEMIC-INJURY; MYELOPEROXIDASE ACTIVITY; PLASMINOGEN-ACTIVATOR; ANESTHETIZED DOGS; FREE-RADICALS; RAT-HEART; LEUKOCYTES; INHIBITION;
Keywords:
ADHESION MOLECULES; NEUTROPHILS; THROMBOLYSIS; REPERFUSION; SELECTIN;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
50
Recensione:
Indirizzi per estratti:
Citazione:
M.J. Silver et al., "ADJUNCTIVE SELECTIN BLOCKADE SUCCESSFULLY REDUCES INFARCT SIZE BEYONDTHROMBOLYSIS IN THE ELECTROLYTIC CANINE CORONARY-ARTERY MODEL", Circulation, 92(3), 1995, pp. 492-499

Abstract

Background An adjunctive pharmacological strategy to thrombolytic therapy that is tailored to limit reperfusion injury after thrombolysis could further maximize the unquestioned benefit of restoring flow to ischemic myocardium. Ischemia-reperfusion injury exhibits features characteristic of an acute inflammatory response, including the rapid activation and infiltration of neutrophils. The initial process of neutrophil migration from the circulation to injured tissue is modulated by a group of adhesion molecules called selectins. The purpose of the present study was to assess the efficacy of a selectin blocker (CY 1503) given as an adjunct to thrombolytic therapy to interfere with the inflammatory response after ischemia-reperfusion and subsequently reduce myocardial infarct size in the electrolytic canine model. Methods and Results A fully occlusive thrombus was formed in the left circumflex coronary artery by electrolytic injury in 20 anesthetized open-chest dogs. After occlusion, an infusion of 1 mg/kg recombinant tissue-type plasminogen activator (rTPA) was administered over 20 minutes with either abolus of placebo or the selectin blocker CY 1503 (40 mg/kg). At the onset of reperfusion, 20 mu g/kg per minute rTPA was administered for 1hour to prevent reocclusion. After 1 hour of reperfusion, infarct size, myocardial myeloperoxidase activity, and reperfusion arrhythmias were measured. In CY 1503-treated dogs, there was a significant 69% reduction in infarct size when expressed as a percentage of the area at risk (6.7+/-8.4% versus 21.8+/-13.6%; P=.008) and a marked reduction in myeloperoxidase activity (0.014+/-0.009 versus 0.0370+/-0.025 U/min per gram; P=.02) compared with the placebo group. There was no difference between the groups in the occurrence of reperfusion arrhythmias. Conclusions Selectin blockade as an adjunct to rTPA-mediated thrombolysissignificantly reduces infarct size and myocardial neutrophil infiltration well beyond thrombolysis alone in the electrolytic canine model. These data suggest that selectin blockade is extremely effective at reducing ischemia-reperfusion injury and myocardial infarct size in thismodel and that the neutrophil is a potent mediator of ischemia-reperfusion injury.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 04/12/20 alle ore 03:42:18