JunB-CBFβ signaling is essential to maintain sarcomeric Z-disc structure and when defective leads to heart failure
In muscle cells, a complex network of Z-disc proteins allows proper reception, transduction and transmission of mechanical and biochemical signals. Mutations in genes encoding different Z-disc proteins such as integrin-linked kinase (ILK) and nexilin have recently been shown to cause heart failure b...
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| Hauptverfasser: | , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
01 August 2010
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| In: |
Journal of cell science
Year: 2010, Jahrgang: 123, Heft: 15, Pages: 2613-2620 |
| ISSN: | 1477-9137 |
| DOI: | 10.1242/jcs.067967 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1242/jcs.067967
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| Verfasserangaben: | Benjamin Meder, Steffen Just, Britta Vogel, Jessica Rudloff, Linda Gärtner, Tillman Dahme, Inken Huttner, Alexandra Zankl, Hugo A. Katus and Wolfgang Rottbauer |
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| 520 | |a In muscle cells, a complex network of Z-disc proteins allows proper reception, transduction and transmission of mechanical and biochemical signals. Mutations in genes encoding different Z-disc proteins such as integrin-linked kinase (ILK) and nexilin have recently been shown to cause heart failure by distinct mechanisms such as disturbed mechanosensing, altered mechanotransduction or mechanical Z-disc destabilization. We identified core-binding factor β (CBFβ) as an essential component for maintaining sarcomeric Z-disc and myofilament organization in heart and skeletal muscle. In CBFβ-deficient cardiomyocytes and skeletal-muscle cells, myofilaments are thinned and Z-discs are misaligned, leading to progressive impairment of heart and skeletal-muscle function. Transcription of the gene encoding CBFβ mainly depends on JunB activity. In JunB-morphant zebrafish, which show a heart-failure phenotype similar to that of CBFβ-deficient zebrafish, transcript and protein levels of CBFβ are severely reduced. Accordingly, ectopic expression of CBFβ can reconstitute cardiomyocyte function and rescue heart failure in JunB morphants, demonstrating for the first time an essential role of JunB-CBFβ signaling for maintaining sarcomere architecture and function. | ||
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