Abstract
Wnt signaling is dysregulated in heart failure (HF) and may promote cardiac hypertrophy, fibrosis, and inflammation. Blocking the Wnt ligand Wnt5a prevents HF in animal models. However, the role of Wnt5a in human HF and its functions in cardiac cells remain unclear. Here, we investigated Wnt5a regulation in HF patients and its effects on primary mouse and human cardiac fibroblasts. Serum Wnt5a was elevated in HF patients and associated with hemodynamic, neurohormonal, and clinical measures of disease severity. In failing human hearts, Wnt5a protein correlated with interleukin (IL)-6 and tissue inhibitor of metalloproteinase (TIMP)-1. Wnt5a messenger RNA (mRNA) levels were markedly upregulated in failing myocardium and both mRNA and protein levels declined following left ventricular assist device therapy. In primary mouse and human cardiac fibroblasts, recombinant Wnt5a dose-dependently upregulated mRNA and protein release of IL-6 and TIMP-1. Wnt5a did not affect β-catenin levels, but activated extracellular signal-regulated kinase 1/2 (ERK1/2) signaling. Importantly, inhibition of ERK1/2 activation attenuated Wnt5a-induced release of IL-6 and TIMP-1. In conclusion, our results show that Wnt5a is elevated in the serum and myocardium of HF patients and is associated with measures of progressive HF. Wnt5a induces IL-6 and TIMP-1 in cardiac fibroblasts, which might promote myocardial inflammation and fibrosis, and thereby contribute to HF progression.
Key messages
• Wnt5a is elevated in serum and myocardium of HF patients and is associated with measures of progressive HF.
• In cardiac fibroblasts, Wnt5a upregulates interleukin (IL)-6 and tissue inhibitor of metalloproteinase (TIMP)-1 through the ERK pathway.
• Wnt5a-mediated effects might promote myocardial inflammation and fibrosis, and thereby contribute to HF progression.
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Acknowledgements
We are grateful to the patients and the animal facility staff at Oslo University Hospital, Oslo, Norway, for contributing to our research.
This work was supported by the South-Eastern Norway Regional Health Authority [grant number 2013041], the Research Council of Norway, Anders Jahre’s Fund for the Promotion of Science, Norway, and the Simon Fougner Hartmanns Family Fund, Denmark.
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Human studies conformed to the Declaration of Helsinki and were approved by the South Eastern Regional Committee for Medical and Health Research Ethics. Written informed consent was obtained from all individuals. Animal experiments were approved by the animal research committee and were carried out in accordance with institutional guidelines and conformed to the Guide for the Care and Use of Laboratory Animals published by the U.S. National Institutes of Health (NIH Publication No. 85-23, revised 2011).
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The authors declare that they have no competing interests.
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Abraityte, A., Vinge, L.E., Askevold, E.T. et al. Wnt5a is elevated in heart failure and affects cardiac fibroblast function. J Mol Med 95, 767–777 (2017). https://doi.org/10.1007/s00109-017-1529-1
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DOI: https://doi.org/10.1007/s00109-017-1529-1