Poly(ADP-ribose) polymerase inhibition improves postischemic myocardial function after cardioplegia-cardiopulmonary bypass.
J Am Coll Surg
; 197(2): 270-7, 2003 Aug.
Article
em En
| MEDLINE
| ID: mdl-12892811
ABSTRACT
BACKGROUND:
Poly(ADP-ribose) polymerase activation has been shown to contribute to the pathogenesis of myocardial ischemia-reperfusion injury. We hypothesized that a novel poly(ADP-ribose) polymerase inhibitor, INO-1001, provides myocardial protection and improves cardiac function after regional ischemia and cardioplegia-cardiopulmonary bypass (CPB). STUDYDESIGN:
Pigs were subjected to 30 minutes of regional ischemia by distal left anterior descending coronary artery ligation followed by CPB (60 minutes) with hyperkalemic cardioplegia (45 minutes). The myocardium then was reperfused post-CPB for 90 minutes. After 15 minutes of ischemia, the treatment group (n = 6) received an INO-1001 bolus (1mg/kg) before a continuous infusion (1mg/kg/hour). Control pigs (n = 6) received vehicle solution. Left ventricular pressure was monitored, from which the maximum, positive first derivative of left ventricular pressure over time (+dP/dt) was calculated. Regional myocardial function in the ischemic area was determined by sonomicrometric analysis. Infarct size was measured as the percent of the ischemic area by tetrazolium staining. Myocardial sections were immunohistochemically stained for poly(ADP-ribose) as a measure of poly(ADP-ribose) polymerase activity and inhibition.RESULTS:
Pigs treated with INO-1001 showed improvements in the +dP/dt at 60 and 90 minutes of post-CPB reperfusion (both p = 0.03) and percent segmental shortening at 30, 60, and 90 minutes of post-CPB reperfusion (p = 0.03, 0.009, and 0.03, respectively). Infarct size was decreased in the treatment group (18.5 +/- 5.7% versus 52.0 +/- 7.7%, INO-1001 versus control, p = 0.03). Poly(ADP-ribose) was reduced in myocardial sections from INO-1001-treated animals compared with controls.CONCLUSIONS:
These results suggest that INO-1001 provides myocardial protection by reducing the extent of infarction and improves cardiac function after regional ischemia and cardioplegia-CPB.
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Base de dados:
MEDLINE
Assunto principal:
Ponte Cardiopulmonar
/
Traumatismo por Reperfusão Miocárdica
/
Substâncias Protetoras
/
Inibidores Enzimáticos
/
Inibidores de Poli(ADP-Ribose) Polimerases
/
Parada Cardíaca Induzida
/
Hemodinâmica
Tipo de estudo:
Etiology_studies
/
Evaluation_studies
Limite:
Animals
Idioma:
En
Ano de publicação:
2003
Tipo de documento:
Article