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Coordinated expression of heme oxygenase-1 and ubiquitin in the porcine heart subjected to ischemia and reperfusion

  • Part II: (Patho)physiological Responses in Myocardium
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Abstract

Heme oxygenase (HO) isozymes, HO-1 and HO-2 catalyze the cleavage of heme b to form the antioxidant biliverdin IXa, iron and the putative cellular messenger carbon monoxide (CO). Heat and stress have been reported to induce the expression of HO-1, in analogy to ubiquitin, a protein of 8 kDa involved in ATP dependent proteolysis. Earlier, we have shown in anesthetized pigs that brief periods of coronary artery occlusion followed by reperfusion produce prolonged regional cardiac dysfunction (stunning) associated with altered expression of a number of genes. In the present study, we report on a coordinated expression pattern of HO-1 and ubiquitin in the same porcine model in which the left anterior descending coronary artery (LAD) was occluded for 10 min and reperfused for 30 min (group I) and after a second occlusion of 10 min, reperfused for either 30 min (group II) or 90 min (group 111) or 210 min (group IV). Myocardial tissue from LAD (stunned) and left circumflex coronary artery (LCx, control) perfused regions were collected in liquid nitrogen and analysed by Northern and dot blot hybridization techniques. We demonstrated a basal myocardial expression of multiple mRNAs (monomer and polymers) encoding ubiquitin and a single mRNA species (1.8 kb) encoding HO-1. However, the expression of both genes was drastically enhanced in the stunned myocardium as compared to the control in groups II and III with maximum mRNAs levels in group II. These results suggest that the myocardial adaptive response to ischemia involves the coordinated induction of HO-1 and ubiquitin, which may be indicative for the existence of a pathophysiologically important defense mechanism whereby, both degradation of denatured cellular proteins and generation of biologically active products of heme metabolism are accelerated.

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Authors and Affiliations

  1. Department of Pharmacology, Erasmus University, Faculty of Medicine and Health Sciences, P.O. Box 1738, 3000, DR Rotterdam, The Netherlands

    H. S. Sharma

  2. Experimental Cardiology-Thoraxcenter, COEUR, Erasmus University, Rotterdam, The Netherlands

    B. C. G. Gho & P. D. Verdouw

  3. Department of Surgery, University of Connecticut Health Center, Farmington, CT, USA

    N. Maulik & D. K. Das

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  1. H. S. Sharma
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  2. N. Maulik
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  3. B. C. G. Gho
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  4. D. K. Das
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  5. P. D. Verdouw
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Sharma, H.S., Maulik, N., Gho, B.C.G. et al. Coordinated expression of heme oxygenase-1 and ubiquitin in the porcine heart subjected to ischemia and reperfusion. Mol Cell Biochem 157, 111–116 (1996). https://doi.org/10.1007/BF00227888

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