Myocardial infarction was associated with positive ACE immunoreactivity in remaining viable left ventricular myocytes in 80% of patients, compared to 0% in control hearts.
Case-Control (n=20)
Is ACE expressed in remaining viable myocytes of human ventricles after myocardial infarction?
ACE expression is markedly increased in viable myocytes adjacent to the infarct scar, suggesting a role for local ACE in post-MI ventricular remodeling.
Absolute Event Rate: 80% vs 0%
BACKGROUND: Local ACE in the heart may be important in the pathophysiological state after myocardial infarction (MI). It is unknown, however, whether ACE is expressed in myocytes of the human heart. METHODS AND RESULTS: Using a newly generated polyclonal antibody to a synthetic peptide corresponding to part of the human endothelial ACE sequence, we examined the localization of ACE in left ventricles of patients (n = 10) with MI obtained at left ventricular aneurysmectomy or autopsy and in the hearts of control subjects at autopsy (n = 10). The avidinbiotinylated peroxidase complex method was used for the immunohistochemical staining for ACE. In the left ventricles, positively stained myocytes for ACE were found in 8 of the 10 patients with MI. ACE immunoreactivity was seen in the remaining viable myocytes located near the infarct scar of the aneurysmal left ventricle and in nonmyocytes such as fibroblasts, macrophages, vascular smooth muscle cells, and endothelial cells within the scarred tissue. On the other hand, no immunoreactivity for ACE was detected in the ventricular myocytes of all control hearts obtained at autopsy. CONCLUSIONS: We observe immunohistochemical staining for ACE in the left ventricular myocytes of the region adjacent to the infarct scar and in nonmyocytes. These results indicate that ACE is markedly increased on the edge of the infarct scar and suggest that local ACE may be important in the ventricular remodeling after MI.
Hokimoto et al. (1996) conducted a case-control in Myocardial Infarction (n=20). Myocardial infarction vs. Control subjects was evaluated on Positively stained myocytes for ACE. Myocardial infarction was associated with positive ACE immunoreactivity in remaining viable left ventricular myocytes in 80% of patients, compared to 0% in control hearts.