Differential expression of the urokinase receptor (CD87) in arthritic and normal synovial tissues

Zoltan Szekanecz, G. Kenneth Haines, Alisa E. Koch

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


Aim - To determine whether the urokinase plasminogen activator receptor (u-PAR; CD87) exhibits a possible pathogenic role in rheumatoid and osteoarthritis. Methods - A semiquantitative, indirect immunoperoxidase histochemical analysis was performed on frozen synovial tissue sections. The recently characterised monoclonal antibody 10G7 recognising transfectants bearing u-PAR was used. Synovial tissue was obtained from 10 patients with rheumatoid arthritis, 10 patients with osteoarthritis, and four normal subjects. Results - u-PAR was expressed on 70-90% of synovial tissue lining cells and subsynovial, interstitial macrophages from the arthritis patients, but only on a few myeloid cells from the normal subjects. It was also present on more endothelial cells from the rheumatoid and osteoarthritis patients, than from normal synovial tissue. Conclusions - Plasminogen activators are important in joint destruction underlying arthritis. The up-regulated expression of u-PAR in diseased versus normal synovial tissue suggests a role for this antigen in the inflammatory and angiogenic mechanisms underlying rheumatoid and osteoarthritis.

Original languageEnglish
Pages (from-to)314-319
Number of pages6
JournalJournal of Clinical Pathology
Issue number4
StatePublished - 1997
Externally publishedYes


  • CD87
  • Osteoarthritis
  • Rheumatoid arthritis
  • Urokinase receptor


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