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Type 2 innate lymphoid cell counts are increased in patients with systemic sclerosis and correlate with the extent of fibrosis
  1. Thomas Wohlfahrt1,
  2. Svetlana Usherenko1,
  3. Matthias Englbrecht1,
  4. Clara Dees1,
  5. Stefanie Weber1,
  6. Christian Beyer1,
  7. Kolja Gelse2,
  8. Oliver Distler3,
  9. Georg Schett1,
  10. Jörg H W Distler1,
  11. Andreas Ramming1
  1. 1Department of Internal Medicine 3, Institute for Clinical Immunology, University of Erlangen-Nuremberg, Erlangen, Germany
  2. 2Department of Trauma Surgery, University of Erlangen-Nuremberg, Erlangen, Germany
  3. 3Division of Rheumatology, Research of Systemic Autoimmune Diseases, University Hospital Zurich, Zurich, Switzerland
  1. Correspondence to Dr Jörg H W Distler, Department of Medicine 3, Institute for Clinical Immunology, University of Erlangen-Nuremberg, Ulmenweg 18, Erlangen D-91054, Germany; joerg.distler{at}uk-erlangen.de

Abstract

Objective Type 2 innate lymphoid cells (ILC2s), a recently identified population of lymphoid cells lacking lineage-specific receptors, promote type 2 immunity and tissue remodelling. However, the contributive role of ILC2s in the pathogenesis of systemic sclerosis (SSc) is unknown. We aimed to evaluate the levels and correlations with fibrotic manifestations in SSc.

Methods 69 patients with SSc and 47 healthy controls were included. Blood samples and skin sections were analysed by flow cytometry and immunohistochemically by staining two complementary panels of markers.

Results Dermal and circulating ILC2s were significantly elevated in patients with SSc compared with controls. Dermal, but not circulating ILC2s were activated. Stratification of the SSc population in patients with limited cutaneous SSc (lcSSc) and diffuse cutaneous SSc (dcSSc) demonstrated increased levels of ILC2s in both subgroups with significantly higher frequencies in dcSSc compared with lcSSc. Moreover, dermal and circulating ILC2 counts correlated closely with the modified Rodnan skin score and with the presence of pulmonary fibrosis.

Conclusions ILC2 counts are elevated in patients with SSc and correlate with the extent of skin fibrosis and the presence of interstitial lung disease providing compelling evidence for profibrotic effect of ILC2s in SSc.

  • Systemic Sclerosis
  • Pulmonary Fibrosis
  • Autoimmune Diseases
  • Fibroblasts

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