Abstract
Despite substantial progress being made in understanding the mechanisms contributing to the pathogenesis of renal fibrosis, there are only a few therapies available to treat or prevent renal fibrosis in clinical use today. Therefore, identifying the key cellular and molecular mediators involved in the pathogenesis of renal fibrosis will provide new therapeutic strategy for treating patients with chronic kidney disease (CKD). β-Arrestin-1, a member of β-arrestin family, not only is a negative adaptor of G protein-coupled receptors (GPCRs), but also acts as a scaffold protein and regulates a diverse array of cellular functions independent of GPCR activation. In this study, we identified for the first time that β-arrestin-1 was upregulated in the kidney from mice with unilateral ureteral obstruction nephropathy as well as in the paraffin-embedded sections of human kidneys from the patients with diabetic nephropathy, polycystic kidney, or uronephrosis, which normally causes renal fibrosis. Deficiency of β-arrestin-1 in mice significantly alleviated renal fibrosis by the regulation of inflammatory responses, kidney fibroblast activation, and epithelial-mesenchymal transition (EMT) in both in vivo and in vitro studies. Furthermore, we found that among the major isoforms of Wnts, Wnt1 was regulated by β-arrestin-1 and gene silencing of Wnt1 inhibited the activation of β-catenin and suppressed β-arrestin-1-mediated renal fibrosis. Collectively, our results indicate that β-arrestin-1 is one of the critical components of signal transduction pathways in the development of renal fibrosis. Modulation of these pathways may be an innovative therapeutic strategy for treating patients with renal fibrosis.
Key messages
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β-Arrestin-1 was upregulated in the kidney from mice with UUO nephropathy.
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β-Arrestin-1 regulated kidney fibroblast activation and epithelial-mesenchymal transition.
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β-Arrestin-1 exacerbated renal fibrosis via mediating Wnt1/β-catenin signaling.
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Funding
This study was supported by the National Science Fund for Distinguished Young Scholars to Yi F (81525005) and the National Nature Science Foundation of China (91642204, 81470958, 81371317, 81600570, and 81400730).
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In this manuscript, Huiyan Xu conducted the experiment, interpreted the data and wrote the manuscript. Quanxin Li, Jiang Liu, Jiaqing Zhu, Liang Li conducted the experiment and analyzed the data. Wang ZY, Zhang Y, Yu Sun, **peng Sun and Rong Wang assisted with the conduction of the experiment. Yi F designed the experiment, wrote the manuscript and approved the final version of the manuscript for publication.
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All mice had unrestricted access to food/water in accordance with Institutional Animal Care and Use Committee procedures of Shandong University. The investigation conforms to the US National Institutes of Health Guide for the Care and Use of Laboratory Animals. Human renal biopsies were conducted in accordance with the principles of the Declaration of Helsinki and were approved by the Research Ethics Committee of Shandong University after informed consent was obtained from the patients.
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The authors declare that they have no conflict of interest.
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Xu, H., Li, Q., Liu, J. et al. β-Arrestin-1 deficiency ameliorates renal interstitial fibrosis by blocking Wnt1/β-catenin signaling in mice. J Mol Med 96, 97–109 (2018). https://doi.org/10.1007/s00109-017-1606-5
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DOI: https://doi.org/10.1007/s00109-017-1606-5