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Extended report
Synovial immunopathology in haemochromatosis arthropathy
  1. Gisela Ruiz Heiland1,
  2. Elmar Aigner2,
  3. Tomáš Dallos1,3,
  4. Enijad Sahinbegovic1,
  5. Veit Krenn4,
  6. Christoph Thaler5,
  7. Günter Weiss6,
  8. Jörg H Distler1,
  9. Christian Datz2,
  10. Georg Schett1,
  11. Jochen Zwerina1
  1. 1Department of Internal Medicine 3 and Institute for Clinical Immunology, University of Erlangen-Nuremberg, Erlangen, Germany
  2. 2Department of Internal Medicine, Hospital Oberndorf, Salzburg, Austria
  3. 32nd Department of Paediatrics, Medical Faculty, Comenius University in Bratislava, Bratislava, Slovakia
  4. 4Institute of Pathology, Trier, Germany
  5. 5Department of Orthopedic Surgery, Medical University of Salzburg, Austria
  6. 6Department of Internal Medicine, Medical University of Innsbruck, Austria
  1. Correspondence to Dr Jochen Zwerina, Department of Internal Medicine 3 and Institute for Clinical Immunology, University of Erlangen-Nuremberg, Krankenhausstrasse 12, 91054 Erlangen, Germany; jochen.zwerina{at}uk-erlangen.de

Abstract

Background Hereditary haemochromatosis (HH) is a common autosomal recessive inherited disorder that frequently causes arthritis. The pathophysiology of musculoskeletal involvement is, however, unclear.

Objective To analyse synovial tissue obtained at surgery from patients with HH arthropathy and compare it qualitatively and quantitatively with specimens from patients with rheumatoid arthritis (RA) and osteoarthritis (OA).

Methods Synovial tissue from 15 patients with HH, 20 with RA and 39 with OA was obtained during surgery. A synovitis grading system was used to determine the severity of synovial inflammation. Using immunohistochemistry, synovial neovascularisation and infiltration of macrophages, neutrophils and lymphocytes were quantitatively assessed.

Results Synovitis in HH arthropathy largely resembles OA with mild infiltration of mononuclear cells and lymphocytes, formation of synovial microvessels and a low degree of synovial hyperplasia. While many features of HH arthropathy are reminiscent of OA, macrophage and especially neutrophil invasion is clearly more prominent in HH arthropathy than in primary OA and mimics features of RA. This finding was observed particularly in synovial tissue of HH samples with marked haemosiderin deposition.

Discussion The histological picture of the synovium in HH arthropathy largely resembles a process reminiscent of OA. Neutrophil invasion is, however, markedly increased in HH arthropathy, especially in joints with iron deposition. Accumulation of neutrophils may be crucial for the production of matrix enzymes, which enables cartilage degradation and more rapidly progressive articular damage.

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Footnotes

  • GRH and EA contributed equally.

  • Funding This work was supported by the German Society for Rheumatology (to JZ) and the Interdisciplinary Centre for Clinical Research Erlangen (IZKF, project A34, to GS and JZ).

  • Competing interests None.

  • Ethics approval This study was conducted with the approval of the ethics committee, University of Erlangen-Nuremberg and written informed consent was obtained from patients in accordance with the Declaration of Helsinki.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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