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01-01-2010 | Original Contribution

Humoral anti-proteasomal autoimmunity in dilated cardiomyopathy

Authors: Antje Voigt, Katrin Bartel, Karl Egerer, Christiane Trimpert, Eugen Feist, Christine Gericke, Reinhard Kandolf, Karin Klingel, Ulrike Kuckelkorn, Karl Stangl, Stephan B. Felix, Gert Baumann, Peter-M. Kloetzel, Alexander Staudt

Published in: Basic Research in Cardiology | Issue 1/2010

Abstract

Virus-induced chronic inflammation, autoimmune processes and impaired protein quality control may be involved in the pathogenesis of dilated cardiomyopathy (DCM). The ubiquitin–proteasome system is important in the modulation of inflammatory processes and the immune response. Proteasomes were identified as targets of a humoral autoimmune response in systemic inflammatory diseases, which provoked us to investigate anti-proteasomal immunity in DCM in detail: a total of 90 DCM patients with impaired left-ventricular function (LVEF ≤ 45%) were enrolled in this study. Autoimmune response to cardiac proteasomes was found to be enhanced in DCM patients, revealing the detection of predominantly α subunits of the 20S proteasome complex. Proteasome antibody (ProtAb) levels were found to be particularly enhanced at stages of advanced heart failure: moderately decreased LVEF and considerably increased NT-pro BNP levels were observed in DCM patients who tested positive for ProtAb (P < 0.05). A linear regression model suggested a link between the detection of cardiotropic viruses in endomyocardial biopsies and anti-proteasomal immunity (P < 0.01). Likewise, ProtAb levels were enhanced in a murine model of chronic enterovirus myocarditis. Our data also point to a potential interaction of ProtAb with the cell surface: ProtAb exerted negative inotropic effects in field-stimulated cardiomyocytes. In conclusion, humoral autoreactive anti-proteasome immune responses appear to be enhanced in DCM. Viral infection of the myocardium may be linked to the induction of anti-proteasomal immunity in DCM.

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Title: Humoral anti-proteasomal autoimmunity in dilated cardiomyopathy
Authors: Antje Voigt
Katrin Bartel
Karl Egerer
Christiane Trimpert
Eugen Feist
Christine Gericke
Reinhard Kandolf
Karin Klingel
Ulrike Kuckelkorn
Karl Stangl
Stephan B. Felix
Gert Baumann
Peter-M. Kloetzel
Alexander Staudt
Publication date: 01-01-2010
Publisher: D. Steinkopff-Verlag
Published in: Basic Research in Cardiology / Issue 1/2010
Print ISSN: 0300-8428
Electronic ISSN: 1435-1803
DOI: https://doi.org/10.1007/s00395-009-0061-z

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