Abstract
Beta-catenin is a component of the intercalated disc in cardiomyocytes, but can also be involved in signalling and activation of gene transcription. We wanted to determine how long-term changes in beta-catenin expression levels would affect mature cardiomyocytes. Conditional transgenic mice that either lacked beta-catenin or that expressed a non-degradable form of beta-catenin in the adult ventricle were created. While mice lacking beta-catenin in the ventricle do not have an overt phenotype, mice expressing a non-degradable form develop dilated cardiomyopathy and do not survive beyond 5 months. A detailed analysis could reveal that this phenotype is correlated with a distinct localisation of beta-catenin in adult cardiomyocytes, which cannot be detected in the nucleus, no matter how much protein is present. Our report is the first study that addresses long-term effects of either the absence of beta-catenin or its stabilisation on ventricular cardiomyocytes and it suggests that beta-catenin’s role in the nucleus may be of little significance in the healthy adult heart.
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Acknowledgments
This work was supported by a grant from the Swiss National Science Foundation (grant#3100-063486.00), a grant from the Gebert Rüf Foundation (grant # P038-01), by the Swiss Cardiovascular Training and Research Network (SCARTNet) and the Swiss University Conference (SUK). Work in the laboratory of Dr Ehler is supported by a Career Establishment Grant by the MRC. We are grateful for many helpful discussions with all members of the Perriard group, especially Dr Jaya Krishnan. In addition we thank Dr Stephan Lange (UCSD, San Diego, USA) and Dr Matthew Wheeler (King’s College London, London, UK) for critically reading the manuscript. We thank Professors Rolf Kemler (Max-Planck Institute, Freiburg, Germany) and Ju Chen (UCSD, San Diego, USA) who provided us with beta-catenin floxed mice and MLC2v-Cre mice. We thank Dr Andrea Domenighetti (University Hospital, Lausanne, Switzerland) and Dr P. Jonsen (VisualSonics Inc., Toronto, Canada) for performing ECG studies on cKO and cΔex3 animals. The help of Dr Nicolas Lindegger (Department of Physiology, Bern, Switzerland) for the isolation of adult cardiomyocytes is also acknowledged. We are grateful to Dr Katja Gehmlich (University College London) for the donation of HL-1 cells.
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395_2010_101_MOESM1_ESM.tif
Supplementary Figure 1: Beta-catenin protein only becomes fully absent in the ventricle after two months. Confocal micrographs of frozen sections stained with monoclonal mouse anti beta-catenin from WT (left column) and cKO (right column) mice at postnatal day 3 (P3), one month, two months, six months and fifteen months of age. The beta-catenin signal at P3 and one month is comparable between WT and cKO and only disappears at two months, indicating a slow turnover of the protein at the intercalated disc. Bar in A equals 10 micometres, bar in C equals 20 micrometres (TIFF 6.83 mb)
395_2010_101_MOESM2_ESM.tif
Supplementary Figure 2: Intercalated disc organisation is hardly affected by the absence of beta-catenin. Confocal micrographs of frozen sections of two months old WT (A, B, E, F, I, J) and cKO ventricles (C, D, G, H, K, L) immunostained for cadherins (A, C), beta-catenin (B, D, F, H, J, L), desmoplakin (E, G) and connexin-43 (I, K). Cadherin staining is slightly more pronounced in the cKO (compare C with A), however neither desmosomes nor gap junctions seem to be altered. Occasional residual beta-catenin containing intercalated discs indicate a lack of recombination (arrow in H). Bar equals 20 micrometres (TIFF 9 mb)
395_2010_101_MOESM3_ESM.tif
Supplementary Figure 3: Nuclear accumulation of beta-catenin following lithium chloride stimulation and inhibition of nuclear export by leptomycin B can be detected in HL-1 cells but not in NRC. Confocal micrographs of HL-1 cells (top two rows) and NRC (bottom two rows) stained 33 for beta-catenin and with DAPI to visualise nuclei. Cells were grown either in control medium, in medium supplemented with lithium chloride (LiCl), leptomycin B (LMB) or both. Bar equals 10 micrometres (TIFF 5.19 mb)
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Hirschy, A., Croquelois, A., Perriard, E. et al. Stabilised beta-catenin in postnatal ventricular myocardium leads to dilated cardiomyopathy and premature death. Basic Res Cardiol 105, 597–608 (2010). https://doi.org/10.1007/s00395-010-0101-8
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DOI: https://doi.org/10.1007/s00395-010-0101-8