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Comparative effects of a vasopeptidase inhibitor vs. an angiotensin convertin enzyme inhibitor on cardiomyocyte apoptosis in rats with heart failure

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Abstract

Apoptosis is involved in ventricular remodeling after myocardial infarction (MI). We investigated the effects of the vasopeptidase inhibitor (VPI) omapatrilat on cardiomyocyte apoptosis and compared it to the angiotensin converting enzyme inhibitor (ACEI) captopril in the rat post-MI model and in cultured neonatal rat cardiomyocytes. Wistar males rats surviving 4 h post-MI were assigned to omapatrilat (40 or 80 mg/kg/day), captopril (160 mg/kg/day) or no treatment. After 56 days, hemodynamic measurements were performed (n = 96) and rats were sacrificed. One group had assessment of cardiac remodeling and detection of DNA fragments by in situ end labelling method (ISEL), while the other had morphologic measurements and DNA laddering assessed. In addition, cultured neonatal rat cardiomyocytes (n = 6) were treated for 72 h with vehicle, captopril or omapatrilat in the presence or absence of the apoptosis inducing agent H2O2. Omapatrilat and captopril resulted in similar improvements of hemodynamic measurements, ventricular weight and dilatation, cardiac fibrosis and myocardial cell cross-section in large MI rats. Omapatrilat increased scar thickness more than did captopril. All sham-operated groups had little evidence of apoptosis. In the large MI group, there was a significant increase in ISEL-positive cells in the control (0.095 ± 0.016%) and captopril (0.124 ± 0.024%) groups in comparison with control sham-operated (0.006 ± 0.006%), but this increase was limited to the peri-MI area. Omapatrilat (0.012 ± 0.012% for both doses) prevented the increase in apoptosis in the peri-MI area. Also, omapatrilat but not captopril reduced DNA laddering in large MI. Moreover, in cultured neonatal rat cardiomyocytes, omapatrilat but not captopril reduced apoptosis as assessed by DNA laddering. The VPI omapatrilat, with its combination of NEP and ACE inhibition, suppresses cardiomyocyte apoptosis post-MI and in neonatal cultured rat cardiomyocytes more than the ACEI captopril, but this does not result in significant hemodynamic or morphologic differences between omapatrilat and captopril.

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Lapointe, N., Tsoporis, J.N., Parker, T.G. et al. Comparative effects of a vasopeptidase inhibitor vs. an angiotensin convertin enzyme inhibitor on cardiomyocyte apoptosis in rats with heart failure. Mol Cell Biochem 254, 235–245 (2003). https://doi.org/10.1023/A:1027328403952

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