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Circulation Research. 2003;92:715-724
Published online before print March 20, 2003, doi: 10.1161/01.RES.0000067471.95890.5C
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(Circulation Research. 2003;92:715.)
© 2003 American Heart Association, Inc.


Molecular Medicine

Myocytes Die by Multiple Mechanisms in Failing Human Hearts

Sawa Kostin, Lieven Pool, Albrecht Elsässer, Stefan Hein, Hannes C.A. Drexler, Eyal Arnon, Yukihiro Hayakawa, René Zimmermann, Erwin Bauer, Wolf-Peter Klövekorn, Jutta Schaper

From the Departments of Experimental Cardiology (S.K., L.P., E.A., Y.H., J.S.) and Molecular Cell Biology (H.C.A.D.), Max-Planck-Institute, Bad Nauheim, Germany; Departments of Cardiac Surgery (S.H., R.Z., E.B., W.-P.K.) and Vascular Genomics (R.Z.), Kerckhoff-Clinic, Bad Nauheim, Germany; and the Department of Cardiology (A.E.), University of Freiburg, Germany.

Correspondence to Sawa Kostin, MD, Max-Planck-Institute, Department of Experimental Cardiology, Benekestr 2D-61231 Bad Nauheim, Germany. E-mail skostin{at}kerckhoff.mpg.de

We tested the hypothesis that myocyte loss in failing human hearts occurs by different mechanisms: apoptosis, oncosis, and autophagic cell death. Explanted hearts from 19 patients with idiopathic dilated cardiomyopathy (EF<=20%) and 7 control hearts were analyzed. Myocyte apoptosis revealed by caspase-3 activation and TUNEL staining occurred at a rate of 0.002±0.0005% (P<0.05 versus control) and oncosis assessed by complement 9 labeling at 0.06±0.001% (P<0.05). Cellular degeneration including appearance of ubiquitin containing autophagic vacuoles and nuclear disintegration was present at the ultrastructural level. Nuclear and cytosolic ubiquitin/protein accumulations occurred at 0.08±0.004% (P<0.05). The ubiquitin-activating enzyme E1 and the ligase E3 were not different from control. In contrast, ubiquitin mRNA levels were 1.8-fold (P<0.02) elevated, and the conjugating enzyme E2 was 2.3-fold upregulated (P<0.005). The most important finding, however, is the 2.3-fold downregulation of the deubiquitination enzyme isopeptidase-T and the 1.5-fold reduction of the ubiquitin-fusion degradation system-1, which in conjunction with unchanged proteasomal subunit levels and proteasomal activity results in massive storage of ubiquitin/protein complexes and in autophagic cell death. A 2-fold decrease of cathepsin D might be an additional factor responsible for the accumulation of ubiquitin/protein conjugates. It is concluded that in human failing hearts apoptosis, oncosis, and autophagy act in parallel to varying degrees. A disturbed balance between a high rate of ubiquitination and inadequate degradation of ubiquitin/protein conjugates may contribute to autophagic cell death. Together, these different types of cell death play a significant role for myocyte disappearance and the development of contractile dysfunction in failing hearts.


Key Words: cell death • oncosis • apoptosis • autophagy • ubiquitin




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