OBJECTIVE: To investigate the effects of PARP inhibition on cardiac and pulmonary function during reperfusion in a clinically relevant experimental model of cardiopulmonary bypass. METHODS: Twelve anesthetized dogs underwent hypothermic cardiopulmonary bypass. After 60 min of hypothermic cardiac arrest, reperfusion was started after application of either saline vehicle (control, n = 6), or the potent PARP-inhibitor PJ34 (5 mg/kg; n = 6). Biventricular hemodynamic variables were measured by combined pressure-volume-conductance catheters. Coronary and pulmonary blood flow, vasodilator responses to acetylcholine and sodium-nitroprusside and pulmonary function were also determined. The cardiac and pulmonary activation of PARP was detected by poly(ADP-ribose) immunohistochemistry. RESULTS: Administration of PJ34 led to a significantly better recovery of left and right ventricular systolic function (P < 0.05) after 60 min of reperfusion. Coronary blood flow was also significantly higher in the PJ34 treated group (P < 0.05) PJ34 treatment preserved the acetylcholine-induced increases in coronary and pulmonary blood (P < 0.05) Pulmonary function in terms of alveolar arterial oxygen difference was better maintained in the PJ34 treated animals (P < 0.05). Immunohistochemical staining revealed PARP activation after cardiopulmonary bypass in both the heart and lung, which was prevented by PJ34. CONCLUSIONS: PARP inhibition improves the recovery of myocardial and endothelial function after hypothermic cardiac arrest and protects against the development of remote pulmonary injury during cardiopulmonary bypass.
OBJECTIVE: To investigate the effects of PARP inhibition on cardiac and pulmonary function during reperfusion in a clinically relevant experimental model of cardiopulmonary bypass. METHODS: Twelve anesthetized dogs underwent hypothermic cardiopulmonary bypass. After 60 min of hypothermic cardiac arrest, reperfusion was started after application of either saline vehicle (control, n = 6), or the potent PARP-inhibitor PJ34 (5 mg/kg; n = 6). Biventricular hemodynamic variables were measured by combined pressure-volume-conductance catheters. Coronary and pulmonary blood flow, vasodilator responses to acetylcholine and sodium-nitroprusside and pulmonary function were also determined. The cardiac and pulmonary activation of PARP was detected by poly(ADP-ribose) immunohistochemistry. RESULTS: Administration of PJ34 led to a significantly better recovery of left and right ventricular systolic function (P < 0.05) after 60 min of reperfusion. Coronary blood flow was also significantly higher in the PJ34 treated group (P < 0.05) PJ34 treatment preserved the acetylcholine-induced increases in coronary and pulmonary blood (P < 0.05) Pulmonary function in terms of alveolar arterial oxygen difference was better maintained in the PJ34 treated animals (P < 0.05). Immunohistochemical staining revealed PARP activation after cardiopulmonary bypass in both the heart and lung, which was prevented by PJ34. CONCLUSIONS: PARP inhibition improves the recovery of myocardial and endothelial function after hypothermic cardiac arrest and protects against the development of remote pulmonary injury during cardiopulmonary bypass.