Volume 48, Issue 8 pp. 2163-2172
Research Article

Synovial fluid exoglycosidases are predictors of rheumatoid arthritis and are effective in cartilage glycosaminoglycan depletion

Zsuzsanna Ortutay

Zsuzsanna Ortutay

Semmelweis University, Budapest, Hungary

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Anna Polgár

Anna Polgár

National Institute of Rheumatology and Physiotherapy, Budapest, Hungary

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Béla Gömör

Béla Gömör

Polyclinic of Hospitaller Brothers of St. John of God, Budapest, Hungary

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Pál Géher

Pál Géher

Polyclinic of Hospitaller Brothers of St. John of God, Budapest, Hungary

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Tamás Lakatos

Tamás Lakatos

Polyclinic of Hospitaller Brothers of St. John of God, Budapest, Hungary

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Tibor T. Glant

Tibor T. Glant

Rush University at Rush-Presbyterian-St. Luke's Medical Center, Chicago, Illinois

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Renate E. Gay

Renate E. Gay

University Hospital of Zurich, Zurich, Switzerland

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Steffen Gay

Steffen Gay

University Hospital of Zurich, Zurich, Switzerland

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Éva Pállinger

Éva Pállinger

Semmelweis University, Budapest, Hungary

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Csaba Farkas

Csaba Farkas

Josa András County Hospital, Nyíregyháza, Hungary

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Éva Farkas

Éva Farkas

Semmelweis University, Budapest, Hungary

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László Tóthfalusi

László Tóthfalusi

Semmelweis University, Budapest, Hungary

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Katalin Kocsis

Katalin Kocsis

Semmelweis University, Budapest, Hungary

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András Falus

András Falus

Semmelweis University, Budapest, Hungary

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Edit I. Buzás

Corresponding Author

Edit I. Buzás

Semmelweis University, Budapest, Hungary

Department of Genetics, Cell and Immunobiology, Semmelweis University, 4 Nagyvárad tér, H-1089 Budapest, HungarySearch for more papers by this author
First published: 01 August 2003
Citations: 32

Abstract

Objective

To analyze enzymes involved in joint damage by simultaneous investigation of glycosidases and matrix metalloproteinases (MMPs) in patients with various joint diseases.

Methods

Activities of glycosidases (β-D-glucuronidase, β-D-N-acetyl-glucosaminidase, β-D-N-acetyl-galactosaminidase, β-D-galactosidase, and α-D-mannosidase) were tested at an acidic pH as well as at the original pH of the synovial fluid (SF) samples in parallel with activities of MMP-1 and MMP-9.

Results

Patients with rheumatoid arthritis (RA) were characterized by significantly elevated activities of β-D-glucuronidase and β-D-N-acetyl-glucosaminidase in SF compared with patients with osteoarthritis, seronegative spondylarthritis, or acute sports injury. To select the best predictor for distinguishing among patient groups, a stepwise logistic regression analysis was performed; the strongest association was found to be between RA and β-D-glucuronidase/β-D-N-acetyl-glucosaminidase activities (measured at the pH of the SF). Further, a significant correlation was observed between the activity of SF β-D-N-acetyl-glucosaminidase and the level of rheumatoid factor. In vitro digestion of human hyaline cartilage samples revealed that the dominant glycosidases, alone or in combination with MMPs, proved to be effective in depleting glycosaminoglycans (GAGs) from cartilage.

Conclusion

These results suggest that exoglycosidases, which are present in the SF of RA patients, may contribute to the depletion of GAGs from cartilage and thereby facilitate the invasion of synovial cells and their attachment to cartilage in RA.

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