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Enhanced expression and localization of heme oxygenase-1 during recovery phase of porcine stunned myocardium

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Abstract

Myocardial adaptation to ischemia involves up-regulated expression of a number of genes implicated in conferring cytoprotection. We have previously shown that myocardial ischemia followed by reperfusion leads to a co-ordinated expression of mRNAs encoding heme oxygenase-1 (HO-1) and ubiquitin in pigs. HO-1 participates in biological reaction leading to the formation of the antioxidant, bilirubin and the putative cellular messenger, carbon monoxide. In the present study, we examined the expression and cellular localization of HO-1 in the heart during myocardial stunning in anesthetized pigs. After thoracotomy, the LAD was occluded for 10 min and reperfused for 30 min (group I, n = 4), again occluded for 10 min and reperfused for 30 min (group II, n = 6), 90 min (group III, n = 4), 210 min (group IV, n = 5) and for 390 min (group V, n = 4). Myocardial tissue specimens were collected in 10% formalin as well as in liquid nitrogen and processed for immunohistochemistry and mRNA expression analysis, respectively. In the distribution territory of the LAD (experimental, E), systolic wall thickening was significantly decreased (39 ± 6%) as compared to that of the area perfused by left circumflex coronary artery (LCx, control) in group I and remained depressed in all subsequent groups. Northern blot analysis revealed that the expression of a single mRNA species of 1.8 kb encoding HO-1 was significantly induced in E as compared to control in groups II and III with maximum mRNA levels in group II (1.9 ± 0.4 fold vs. control). Immunoreactive HO-1 was localized in the cytoplasm of cardiomyocytes as well as in the perivascular regions in all groups. Semiquantitative analysis of HO-1 staining showed significantly enhanced levels of HO-1 in perivascular region in E as compared to respective controls derived from groups III and IV. These results suggest that myocardial adaptive response to ischemia involves up-regulation of HO-1 in cells of perivascular region indicating that this enzyme may participate in regulating vascular tone via CO and thereby, contributing in pathophysiologically important defense mechanism(s) in the heart.

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Authors and Affiliations

  1. Department of Pharmacology, Cardiovascular Research Institute, Erasmus University, Rotterdam, The Netherlands

    Hari S. Sharma

  2. UCONN Health Center, Farmington, USA

    Dipak K. Das

  3. Thoraxcenter, Cardiovascular Research Institute, Erasmus University, Rotterdam, The Netherlands

    Pieter D. Verdouw

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  1. Hari S. Sharma
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  2. Dipak K. Das
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  3. Pieter D. Verdouw
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Sharma, H.S., Das, D.K. & Verdouw, P.D. Enhanced expression and localization of heme oxygenase-1 during recovery phase of porcine stunned myocardium. Mol Cell Biochem 196, 133–139 (1999). https://doi.org/10.1023/A:1006984027403

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