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Number of individual ACPA reactivities in synovial fluid immune complexes, but not serum anti-CCP2 levels, associate with inflammation and joint destruction in rheumatoid arthritis
  1. Azita Sohrabian1,
  2. Linda Mathsson-Alm1,2,
  3. Monika Hansson3,
  4. Ann Knight4,
  5. Jörgen Lysholm5,
  6. Martin Cornillet6,
  7. Karl Skriner7,
  8. Guy Serre6,
  9. Anders Larsson8,
  10. Tomas Weitoft9,
  11. Johan Rönnelid1
  1. 1 Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala, Sweden
  2. 2 Thermo Fischer Scientific, Uppsala, Sweden
  3. 3 Department of Medicine, Rheumatology Unit, Karolinska Institutet, Stockholm, Sweden
  4. 4 Section of Rheumatology, Department of Medical Sciences, Uppsala University Hospital, Uppsala, Sweden
  5. 5 Clinic of Rheumatology, Falu Hospital, Falun, Sweden
  6. 6 Laboratory of Epithelial Differentiation and Rheumatoid Autoimmunity, U1056 Inserm, Toulouse University, Toulouse, France
  7. 7 Department of Medicine, Charité University Hospital, Berlin, Germany
  8. 8 Department of Medical Sciences, Section of Clinical Chemistry, Uppsala University, Uppsala, Sweden
  9. 9 Department of Research and Development, Section of Rheumatology, Uppsala University/Region of Gävleborg, Gävle, Sweden
  1. Correspondence to Dr Johan Rönnelid, Department of Immunology, Genetics and Pathology, Uppsala University, Uppsala SE-75185, Sweden; johan.ronnelid{at}igp.uu.se

Footnotes

  • TW and JR contributed equally.

  • Handling editor Josef S Smolen

  • Contributors AS and JR conceived the study. AS developed the IC purification technique described in this paper and performed most of the laboratory work. MH and LM-A developed the multiplex microarray. MC, KS and GS provided peptides for the analyses, including validation of their performance. AK, JL and TW included and performed clinical characterisation of the investigated patients. AL investigated inflammatory markers. AS and JR drafted the manuscript. All authors read, commented on and approved the final manuscript.

  • Funding This study was funded by grants from the Swedish Research Council, the Swedish Rheumatism Association, King Gustav V 80-year foundation, ALF grants provided by the Uppsala County Council, the Rudberg Foundation and the Brunnberg Foundation.

  • Competing interests LM-A is employed by Thermo Fisher Scientific. KS is co-inventor of the patents US 13/141,960, EP 09799354.7 describing the diagnostic use of the hnRNP-A3 peptide epitopes. GS is co-inventor of several international patents about ACPA antigens held by BioMérieux Cy and licensed to Eurodiagnostica Cy, and Axis-Shield Cy for commercialisation of the CCP2 assays; according to French laws, he receives a part of the royalties paid to the Toulouse III University and the University Hospital of Toulouse.

  • Patient consent Not required.

  • Ethics approval The ethics board in Uppsala.

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

  • Data sharing statement Most data are shown in the manuscript and supplementary files. However, calculations using the alternative cut-offs (see Results section) are not included but can be obtained from JR.

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Footnotes

  • TW and JR contributed equally.

  • Handling editor Josef S Smolen

  • Contributors AS and JR conceived the study. AS developed the IC purification technique described in this paper and performed most of the laboratory work. MH and LM-A developed the multiplex microarray. MC, KS and GS provided peptides for the analyses, including validation of their performance. AK, JL and TW included and performed clinical characterisation of the investigated patients. AL investigated inflammatory markers. AS and JR drafted the manuscript. All authors read, commented on and approved the final manuscript.

  • Funding This study was funded by grants from the Swedish Research Council, the Swedish Rheumatism Association, King Gustav V 80-year foundation, ALF grants provided by the Uppsala County Council, the Rudberg Foundation and the Brunnberg Foundation.

  • Competing interests LM-A is employed by Thermo Fisher Scientific. KS is co-inventor of the patents US 13/141,960, EP 09799354.7 describing the diagnostic use of the hnRNP-A3 peptide epitopes. GS is co-inventor of several international patents about ACPA antigens held by BioMérieux Cy and licensed to Eurodiagnostica Cy, and Axis-Shield Cy for commercialisation of the CCP2 assays; according to French laws, he receives a part of the royalties paid to the Toulouse III University and the University Hospital of Toulouse.

  • Patient consent Not required.

  • Ethics approval The ethics board in Uppsala.

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

  • Data sharing statement Most data are shown in the manuscript and supplementary files. However, calculations using the alternative cut-offs (see Results section) are not included but can be obtained from JR.

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