Clinical Rheumatology

, Volume 29, Issue 11, pp 1301–1309 | Cite as

Circulating levels of interleukin-6, vascular endothelial growth factor, YKL-40, matrix metalloproteinase-3, and total aggrecan in spondyloarthritis patients during 3 years of treatment with TNFα inhibitors

  • Susanne Juhl Pedersen
  • Merete Lund Hetland
  • Inge Juul Sørensen
  • Mikkel Østergaard
  • Hans Jørgen Nielsen
  • Julia Sidenius Johansen
Brief Report

Abstract

The objectives of the study were to investigate short and long-term changes and relations to treatment response of plasma interleukin-6 (IL-6), vascular endothelial growth factor (VEGF), YKL-40, matrix metalloproteinase-3 (MMP-3), and total aggrecan in patients with spondyloarthritis (SpA) treated with tumor necrosis factor-alpha (TNFα) inhibitors and to compare with levels in healthy subjects. Biomarkers were measured in an observational cohort of 49 SpA patients (ankylosing spondylitis, n = 32, and psoriatic arthritis, n = 17) initiating TNFα inhibitor therapy (infliximab, n = 38; etanercept, n = 8; and adalimumab, n = 3) and compared with levels in healthy subjects. Clinical parameters and biomarkers were measured at baseline, weeks 2, 6, and every 6–12 weeks for up to 3 years. Patients with co-morbidities (n = 4), missing baseline samples (n = 3), and adverse events (n = 5) were excluded. Patients with SpA had compared with healthy subjects elevated IL-6 (median 8.5 ng/l (range, 0.98–64) vs. 1.3 (0.33–26)), VEGF (105 ng/l (22–752) vs. 45 (12–351)), YKL-40 (74 μg/l (14–572) vs. 43 (20–184)), and MMP-3 (43 μg/l (9.1–401) vs. 16 (2.5–47), p ≤ 0.001), whereas total aggrecan was lower (662 μg/l (223–2,219) vs. 816 (399–2,190),p ≤ 0.001). Two weeks after first treatment, all biomarker levels changed towards normal levels (p ≤ 0.03) in clinical responders (n = 24), and persistent reductions over 3 years were found in IL-6, VEGF, YKL-40, and MMP-3. Only MMP-3 decreased (p ≤ 0.02) in non-responders (n = 13). The study demonstrated changes of plasma IL-6, VEGF, YKL-40, MMP-3, and total aggrecan and a potential value for monitoring disease activity and treatment response in SpA patients. Larger prospective studies are required to clarify clinical utility of these biomarkers.

Keywords

Biomarkers Interleukin-6 Long-term changes Matrix metalloproteinase-3 Spondyloarthritis TNFα inhibitors Total aggrecan Vascular endothelial growth factor YKL-40 

Notes

Acknowledgements

The YKL-40 ELISA kits were provided by Quidel Corporation (San Diego, CA, USA) and the total aggrecan ELISA kits by IDS Nordic (Boldon, UK). Quidel and IDS Nordic had no role in (1) the design of the study; (2) the data collection, analysis, and interpretation; (3) the preparation of the manuscript; and (4) no rights to approve, delay, or disapprove of publication of the work. Furthermore, we thank the Faculty of Health Sciences, University of Copenhagen, Denmark, for a Ph.D. grant (3 years salary) to Susanne Juhl Pedersen. In addition, we thank Dr. Ole Slot, Dr. Ole Majgaard, and Dr. Ulrik Birk Lauridsen who treated the patients included in the study; laboratory technician Teresa Rozenfeld for analyzing the biomarkers; and the staff at the Department of Clinical Immunology at Nykøbing Falster County Hospital for providing blood samples from healthy volunteer blood donors.

Disclosures

SJ Pedersen, none; ML Hetland has received consulting fees and/or research grants from Abbott, Bristol-Meyer Squibb, Centocor, Pfizer, Novartis, Roche, Schering-Plough, UCB, and Wyeth; IJ Sørensen has received consulting fees and speaking fees from Abbott, Bristol-Myers Squibb, Schering-Plough, and Wyeth; M Østergaard has received consulting fees and/or research grants from Abbott, Amgen, Bristol-Meyer Squibb, Centocor, Genmab, Glaxo-Smith-Kline, Leo, Novo, Pfizer, Novartis, Roche, Schering-Plough, UCB, and Wyeth; HJ Nielsen, none; and JS Johansen, none.

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Copyright information

© Clinical Rheumatology 2010

Authors and Affiliations

  • Susanne Juhl Pedersen
    • 1
    • 6
  • Merete Lund Hetland
    • 2
    • 3
  • Inge Juul Sørensen
    • 2
  • Mikkel Østergaard
    • 2
  • Hans Jørgen Nielsen
    • 4
  • Julia Sidenius Johansen
    • 5
  1. 1.Department of RheumatologyCopenhagen University HospitalHerlev and GentofteDenmark
  2. 2.Department of RheumatologyCopenhagen University HospitalHvidovre and GlostrupDenmark
  3. 3.DANBIO Database, Department of RheumatologyHvidovre and Glostrup HospitalsHvidovre and GlostrupDenmark
  4. 4.Department of Surgical GastroenterologyCopenhagen University HospitalHvidovreDenmark
  5. 5.Department of Medicine and OncologyCopenhagen University HospitalHerlevDenmark
  6. 6.Department of Rheumatology, C post 535Copenhagen University Hospital GentofteHellerupDenmark

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