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. 2000 Feb;43(2):275-80.
doi: 10.1002/1529-0131(200002)43:2<275::AID-ANR6>3.0.CO;2-#.

Increased expression of extracellular matrix metalloproteinase inducer in rheumatoid synovium

Y T Konttinen  1 , T F Li, J Mandelin, M Liljeström, T Sorsa, S Santavirta, I Virtanen
Affiliations

Increased expression of extracellular matrix metalloproteinase inducer in rheumatoid synovium

Y T Konttinen et al. Arthritis Rheum. 2000 Feb.

Abstract

Objective: To investigate the expression of extracellular matrix metalloproteinase inducer (EMMPRIN) in the synovial membrane of patients with rheumatoid arthritis (RA) and osteoarthritis (OA).

Methods: Mouse monoclonal antibody against human EMMPRIN was applied according to an avidin-biotin-peroxidase complex method to reveal EMMPRIN expression. Western blotting and reverse transcriptase-polymerase chain reaction (RT-PCR) were performed to check for the presence of EMMPRIN protein and messenger RNA (mRNA).

Results: EMMPRIN immunoreactivity was more intense in RA than in OA synovial membrane (P < 0.01). EMMPRIN staining was more widespread in RA than in OA, especially in association with macrophage infiltrates. RT-PCR of synovial membrane samples disclosed the presence of EMMPRIN mRNA. Nucleotide sequencing of the PCR amplification products confirmed the identity of the amplified bands. Immunoblot analysis revealed 55-kd glycosylated EMMPRIN bands, which were particularly prominent in RA samples.

Conclusion: The expression of EMMPRIN is upregulated in the rheumatoid synovial membrane. EMMPRIN can induce local production of at least MMPs 1, 2, and 3, and can thereby play a role in joint destruction in RA.

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