Portal de Periódicos da CAPES

Heme oxygenase‐1 related carbon monoxide production and ventricular fibrillation in isolated ischemic/reperfused mouse myocardium

2003; Wiley; Volume: 17; Issue: 14 Linguagem: Inglês

10.1096/fj.03-0032fje

1530-6860

István Bak, Levente Szendrei, Tibor Turóczi, Gábor Papp, Ferenc Joó, Dipak K. Das, Joël de Leiris, Péter Dér, Béla Juhász, E Varga, Ildikó Bácskay, József Balla, Péter Kovács, Árpád Tósaki,

Hemoglobin structure and function

Heme oxygenase-1 (HO-1)-dependent carbon monoxide (CO) production related to reperfusion-induced ventricular fibrillation (VF) was studied in HO-1 wild-type (+/+), heterozygous (+/-), and homozygous (-/-) isolated ischemic/reperfused mouse heart. In HO-1 homozygous myocardium, under aerobic conditions, HO-1 enzyme activity, HO-1 mRNA, and protein expression were not detected in comparison with aerobically perfused wild-type and heterozygous myocardium. In wild-type, HO-1 hetero- and homozygous hearts subjected to 20 min ischemia followed by 2 h of reperfusion, the expression of HO-1 mRNA, protein, and HO-1 enzyme activity was detected in various degrees. A reduction in the expression of HO-1 mRNA, protein, and enzyme activity in fibrillated wild-type and heterozygous myocardium was observed. In reperfused/nonfibrillated wild-type and heterozygous hearts, a reduction in HO-1 mRNA, protein expression, and HO-1 enzyme activity was not observed, indicating that changes in HO-1 mRNA, protein, and enzyme activity could be related to the development of VF. These changes were reflected in the HO-1-related endogenous CO production measured by gas chromatography. In HO-1 knockout ischemic/reperfused myocardium, all hearts showed VF, and no detection in HO-1 mRNA, protein, and enzyme activity was observed. Thus, interventions that are able to increase endogenous CO may prevent the development of VF.