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Unaltered ryanodine receptor protein levels in ischemic cardiomvopathy

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Abstract

Previous studies on sarcoplasmic reticulum calcium release channel (ryanodine receptor) demonstrated that protein levels are unchanged in myocardium from hearts with end-stage failing dilated cardiomyopathy. In ischemic cardiomyopathy, ryanodine receptor mRNA levels were shown to be decreased but no data on protein levels are available. Accordingly, protein levels of ryanodine receptor, calsequestrin, and sarcoplasmic reticulum calcium-ATPase (SR-Ca2+-ATPase) were measured by Western blot analysis in nonfailing human myocardium (n = 7) and in end-stage failing myocardium due to ischemic cardiomyopathy (n = 14). Protein levels of calsequestrin which is the major sarcoplasmic reticulum calcium storage protein were similar in nonfailing myocardium and in myocardium from end-stage failing hearts with ischemic cardiomyopathy. Ryanodine receptor protein levels, normalized to total protein or calsequestrin were also unchanged in ischemic cardiomyopathy. In contrast, protein levels of SR-Ca2+-ATPase normalized to total protein or calsequestrin were decreased by 31 and 30%, respectively (p < 0.05). The data indicate that (I) sarcoplasmic reticulum calcium uptake sites are decreased relative to the release sites in ischemic cardiomyopathy, and (2) alterations of sarcoplasmic proteins are similar in ischemic and dilated cardiomyopathy.

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Authors and Affiliations

  1. Medizinische Klinik III, Universität Freiburg, Germany

    Wolfgang Schillinger, Markus Meyer, Hanjörg Just & Gerd Hasenfuss

  2. Shionogi Institute for Medical Science, Osaka

    Goro Kuwajima

  3. Dept. of Molecular Neurobiology, Institute of Medical Science, University of Tokyo, Japan

    Katsuhiko Mikoshiba

Authors
  1. Wolfgang Schillinger
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  2. Markus Meyer
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  3. Goro Kuwajima
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  4. Katsuhiko Mikoshiba
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  5. Hanjörg Just
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  6. Gerd Hasenfuss
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Schillinger, W., Meyer, M., Kuwajima, G. et al. Unaltered ryanodine receptor protein levels in ischemic cardiomvopathy. Mol Cell Biochem 160, 297–302 (1996). https://doi.org/10.1007/BF00240062

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  • DOI: https://doi.org/10.1007/BF00240062

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