Glucocorticoid receptor in stromal cells is essential for glucocorticoid-mediated suppression of inflammation in arthritis

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Mascha Koenen - , Ulm University (Author)
  • Stephan Culemann - , Leibniz Institute on Aging - Fritz Lipmann Institute, Friedrich-Alexander University Erlangen-Nürnberg (Author)
  • Sabine Vettorazzi - , Ulm University, Leibniz Institute on Aging - Fritz Lipmann Institute (Author)
  • Giorgio Caratti - , Ulm University (Author)
  • Lucien Frappart - , Leibniz Institute on Aging - Fritz Lipmann Institute, Universite Claude Bernard Lyon 1 (Author)
  • Wolfgang Baum - , Friedrich-Alexander University Erlangen-Nürnberg (Author)
  • Gerhard Krönke - , Friedrich-Alexander University Erlangen-Nürnberg (Author)
  • Ulrike Baschant - , Department of Internal Medicine III, Leibniz Institute on Aging - Fritz Lipmann Institute, University Hospital Carl Gustav Carus Dresden, TUD Dresden University of Technology (Author)
  • Jan P. Tuckermann - , Ulm University, Leibniz Institute on Aging - Fritz Lipmann Institute (Author)

Abstract

Background Glucocorticoid (GC) therapy is frequently used to treat rheumatoid arthritis due to potent anti-inflammatory actions of GCs. Direct actions of GCs on immune cells were suggested to suppress inflammation. Objectives Define the role of the glucocorticoid receptor (GR) in stromal cells for suppression of inflammatory arthritis. Methods Bone marrow chimeric mice lacking the GR in the hematopoietic or stromal compartment, respectively, and mice with impaired GR dimerisation (GR dim) were analysed for their response to dexamethasone (DEX, 1 mg/kg) treatment in serum transfer-induced arthritis (STIA). Joint swelling, cell infiltration (histology), cytokines, cell composition (flow cytometry) and gene expression were analysed and RNASeq of wild type and GR dim primary murine fibroblast-like synoviocytes (FLS) was performed. Results GR deficiency in immune cells did not impair GC-mediated suppression of STIA. In contrast, mice with GR-deficient or GR dimerisation-impaired stromal cells were resistant to GC treatment, despite efficient suppression of cytokines. Intriguingly, in mice with impaired GR function in the stromal compartment, GCs failed to stimulate non-classical, non-activated macrophages (Ly6C neg, MHCII neg) and associated anti-inflammatory markers CD163, CD36, AnxA1, MerTK and Axl. Mice with GR deficiency in FLS were partially resistant to GC-induced suppression of STIA. Accordingly, RNASeq analysis of DEX-treated GR dim FLS revealed a distinct gene signature indicating enhanced activity and a failure to reduce macrophage inflammatory protein (Mip)-1α and Mip-1β. Conclusion We report a novel anti-inflammatory mechanism of GC action that involves GR dimerisation-dependent gene regulation in non-immune stromal cells, presumably FLS. FLS control non-classical, anti-inflammatory polarisation of macrophages that contributes to suppression of inflammation in arthritis.

Details

Original languageEnglish
Pages (from-to)1610-1618
Number of pages9
JournalAnnals of the rheumatic diseases
Volume77
Issue number11
Publication statusPublished - 1 Nov 2018
Peer-reviewedYes

External IDs

PubMed 29997111
ORCID /0000-0002-6862-1650/work/173517158

Keywords

Keywords

  • arthritis, corticosteroids, fibroblasts, inflammation