Rheumatology International

, Volume 33, Issue 2, pp 341–346 | Cite as

Relationship between sonographic parameters and YKL-40 levels in rheumatoid arthritis

  • Maria Kazakova
  • Anastas Batalov
  • Tanya Deneva
  • Nonka Mateva
  • Zlatimir Kolarov
  • Victoria Sarafian
Original Article

Abstract

YKL-40, also known as human cartilage glycoprotein 39, is a member of the “mammalian chitinase-like proteins” family without chitinase activity. Increased serum concentrations are associated with inflammatory processes and several types of cancer. In this study, we evaluated YKL-40 levels in serum and synovial fluid of patients with rheumatoid arthritis in comparison with the ultrasonographic findings. YKL-40 levels were measured by enzyme-linked immunosorbent assay in 25 patients with active rheumatoid arthritis and in 40 healthy subjects. B mode and power Doppler were performed to determine synovial thickening and vascularization. Serum YKL-40 level in patients was significantly higher than the concentration in healthy controls (P < 0.01). In patients with rheumatoid arthritis, the level of the glycoprotein in synovial fluid was remarkably elevated compared to the serum level (P = 0.003). The B mode and power Doppler scores correlated to YKL-40 in serum and synovial fluid (P = 0.07). Serum YKL-40 levels were related positively to serum markers of inflammation such as C-reactive protein (P = 0.004) and erythrocyte sedimentation rate (P = 0.003). This study is the first to demonstrate a relationship between YKL-40 levels and ultrasonographic examinations in Bulgarian patients with rheumatoid arthritis. The findings suggest that YKL-40 might be implicated in the pathogenesis of the disease and could indicate the level of joint inflammation.

Keywords

Joint sonography YKL-40 Rheumatoid arthritis 

Notes

Acknowledgments

The study was supported by grants no. 1/2009 and 1/2010 from Medical University-Plovdiv.

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Copyright information

© Springer-Verlag 2012

Authors and Affiliations

  • Maria Kazakova
    • 1
  • Anastas Batalov
    • 2
  • Tanya Deneva
    • 3
  • Nonka Mateva
    • 4
  • Zlatimir Kolarov
    • 5
  • Victoria Sarafian
    • 1
  1. 1.Department of Medical BiologyMedical University-PlovdivPlovdivBulgaria
  2. 2.Department of RheumatologyMedical University-PlovdivPlovdivBulgaria
  3. 3.Department of Clinical LaboratoryMedical University-PlovdivPlovdivBulgaria
  4. 4.Department of Health Management, Health Economics and General MedicineMedical University-PlovdivPlovdivBulgaria
  5. 5.Clinic of RheumatologyMedical University-SofiaSofiaBulgaria

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