Rheumatology International

, Volume 28, Issue 9, pp 949–950

Chitotriosidase activity in juvenile idiopathic arthritis

Authors

    • Division of Rheumatology, Nephrology, Infectious diseases and Endocrinology, Department of PediatricsInnsbruck Medical University
  • Sabine Scholl-Bürgi
    • Division of Neonatology and Neuropediatrics, Department of PediatricsInnsbruck Medical University
  • David Hössinger
    • Division of Rheumatology, Nephrology, Infectious diseases and Endocrinology, Department of PediatricsInnsbruck Medical University
  • Petra Wondrak
    • Division of Neonatology and Neuropediatrics, Department of PediatricsInnsbruck Medical University
  • Martina Prelog
    • Division of Rheumatology, Nephrology, Infectious diseases and Endocrinology, Department of PediatricsInnsbruck Medical University
  • Lothar-Bernd Zimmerhackl
    • Division of Rheumatology, Nephrology, Infectious diseases and Endocrinology, Department of PediatricsInnsbruck Medical University
Short Communication

DOI: 10.1007/s00296-008-0558-z

Cite this article as:
Brunner, J.K.H., Scholl-Bürgi, S., Hössinger, D. et al. Rheumatol Int (2008) 28: 949. doi:10.1007/s00296-008-0558-z

Abstract

Juvenile idiopathic arthritis (JIA) is an inflammatory joint disease of unknown etiology. The pathogenesis is driven by T and B cells. The role of macrophages remains unclear. Chitotriosidase belongs to the chitinase protein family and is secreted by activated macrophages. The chitinases are able to catalyze the hydrolysis of chitin or chitin-like substrates such as 4-methylumbelliferyl chitotrioside. Chitotriosidase activity was determined using the substrate 4-methylumbelliferyl β-DNNN″-triacetylchitotrioside (4-MU-TCT, SIGMA Chemical Co.). The substrate and serum were incubated with the serum in a citrate/phosphate buffer. The reaction was stopped by adding a buffer (Na2CO3). The fluorescence of 4-methylumbelliferone was evaluated by fluorimeter at excitation 360 nm and emission 450 nm. We report about chitotriosidase measurements in patients with JIA. The chitotriosidase level in synovial fluid was up to ∼1,000 nmol/(h ml) at disease onset before therapy. The level in the sera was below 600 nmol/(h ml). Serum chitotriosidase levels could represent the activity of macrophages in the synovial fluid in JIA.

Keywords

Juvenile idiopathic arthritisChitotriosidase

Copyright information

© Springer-Verlag 2008