Effects of doxorubicin cancer therapy on autophagy and the ubiquitin-proteasome system in long-term cultured adult rat cardiomyocytes

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• 作者：Polychronis Dimitrakis (1)
  Maria-Iris Romay-Ogando (1)
  Francesco Timolati (1)
  Thomas M. Suter (1)
  Christian Zuppinger (12) christian.zuppinger@dkf.unibe.ch
• 关键词：Autophagy &#8211 ; Apoptosis &#8211 ; Doxorubicin &#8211 ; Cardiomyocytes &#8211 ; Proteasome &#8211 ; Rat (Wistar ; adult male)
• 刊名：Cell and Tissue Research
• 出版年：2012
• 出版时间：November 2012
• 年：2012
• 卷：350
• 期：2
• 页码：361-372
• 全文大小：815.6 KB
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• 作者单位：1. Cardiology, Swiss Cardiovascular Center Bern, Bern University Hospital and University of Bern, Bern, Switzerland2. Cardiology, Department of Clinical Research MEM E808, Bern University Hospital, Murtenstrasse 35, 3010 Bern, Switzerland
• ISSN：1432-0878

文摘

The clinical use of anthracyclines in cancer therapy is limited by dose-dependent cardiotoxicity that involves cardiomyocyte injury and death. We have tested the hypothesis that anthracyclines affect protein degradation pathways in adult cardiomyocytes. To this aim, we assessed the effects of doxorubicin (Doxo) on apoptosis, autophagy and the proteasome/ubiquitin system in long-term cultured adult rat cardiomyocytes. Accumulation of poly-ubiquitinated proteins, increase of cathepsin-D-positive lysosomes and myofibrillar degradation were observed in Doxo-treated cardiomyocytes. Chymotrypsin-like activity of the proteasome was initially increased and then inhibited by Doxo over a time-course of 48 h. Proteasome 20S proteins were down-regulated by higher doses of Doxo. The expression of MURF-1, an ubiquitin-ligase specifically targeting myofibrillar proteins, was suppressed by Doxo at all concentrations measured. Microtubule-associated protein 1 light chain 3B (LC3)-positive punctae and both LC3-I and -II proteins were induced by Doxo in a dose-dependent manner, as confirmed by using lentiviral expression of green fluorescence protein bound to LC3 and live imaging. The lysosomotropic drug chloroquine led to autophagosome accumulation, which increased with concomitant Doxo treatment indicating enhanced autophagic flux. We conclude that Doxo causes a downregulation of the protein degradation machinery of cardiomyocytes with a resulting accumulation of poly-ubiquitinated proteins and autophagosomes. Although autophagy is initially stimulated as a compensatory response to cytotoxic stress, it is followed by apoptosis and necrosis at higher doses and longer exposure times. This mechanism might contribute to the late cardiotoxicity of anthracyclines by accelerated aging of the postmitotic adult cardiomyocytes and to the susceptibility of the aging heart to anthracycline cancer therapy.