Abstract
Rheumatoid arthritis (RA) is a chronic autoimmune disease characterized by inflammation and destruction of synovial joints. The function of sirtuin (SIRT)1 in RA is inconclusive. In human synovial cells, SIRT1 was shown to promote cytokine production and apoptosis resistance. However, deletion of SIRT1 aggravated inflammatory arthritis in mice and increased production of pro-inflammatory cytokines in murine macrophages. In the current study, we investigated the regulation, expression, and function of SIRT1 in RA, in particular its role in adhesion and proliferation of human RA synovial fibroblasts (RASF). We found that expression of SIRT1 was increased in vivo in synovial tissues of RA smokers and in vitro by stimulation of RASF with TNFα, but decreased upon treatment with cigarette smoke extract. Synovial tissues of RA smokers showed higher leukocytic infiltration that positively correlated with enhanced levels of SIRT1. Global transcriptome analysis revealed that SIRT1 modulates expression of genes involved in the regulation of inflammatory response and cell adhesion. In functional studies, silencing of SIRT1 reduced proliferation and leukocytic adhesion to RASF but showed inconsistent results in the regulation of adhesion to plastic. In conclusion, SIRT1 modulates the proliferative and potentially also adhesive properties of RASF and can therefore promote progression of RA.
Key messages
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SIRT1 is upregulated by TNFα but decreased upon CSE treatment of RASF.
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Upregulation of SIRT1 in RA smokers correlates with increased leukocytic infiltration.
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SIRT1 modulates expression of genes regulating cell adhesion and inflammation.
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SIRT1 regulates proliferation of RASF.
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Acknowledgments
We would like to thank Michael O. Hottiger (Institute of Veterinary Biochemistry and Molecular Biology, University of Zurich, Switzerland) for the SIRT1 overexpression vector. We thank Anna Bratus and Giancarlo Russo from Functional Genomics Center Zurich (ETH Zurich/University of Zurich, Switzerland) for performing the next generation sequencing and analyzing RNA sequencing data. We also thank Maria Comazzi and Peter Künzler (Center of Experimental Rheumatology, University Hospital Zurich, Switzerland) for excellent technical assistance. This work was supported by the Zurich Center of Integrative Human Physiology (ZIHP, University of Zurich, Switzerland), BeTheCure, IAR Epalinges, EuroTEAM (grant number 305549).
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Engler, A., Tange, C., Frank-Bertoncelj, M. et al. Regulation and function of SIRT1 in rheumatoid arthritis synovial fibroblasts. J Mol Med 94, 173–182 (2016). https://doi.org/10.1007/s00109-015-1332-9
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DOI: https://doi.org/10.1007/s00109-015-1332-9