Abstract :
[en] OBJECTIVE: To study the levels of matrix metalloproteinase-3 (MMP-3) in the knee
synovial fluid (SF) of inflammatory arthropathies (rheumatoid arthritis whether
erosive or not, reactive arthritis, acute crystal arthritis) and degenerative
arthropathies [chronic crystal disease, osteoarthritis and (control) meniscus
pathology] and to correlate them with the degree of joint destruction, local
inflammatory and immune parameters and systemic markers of inflammation. METHODS:
SF levels of MMP-3 (precursor, active and tissue inhibitor of MMP-bound forms),
tumour necrosis factor (TNF) alpha, soluble TNF receptors I and II, interleukin
(IL)-6 and soluble IL-6 receptor were measured by ELISA in 107 inflammatory and
53 degenerative arthropathies. RESULTS: MMP-3 levels in SF were (i) significantly
higher in inflammatory than in degenerative arthropathies; (ii) not related to
the degree of joint destruction; (iii) significantly correlated with the levels
of all SF markers tested and with erythrocyte sedimentation rate and serum levels
of C-reactive protein and fibrinogen. CONCLUSION: Increased MMP-3 levels in SF
are found in inflammatory arthropathies and are not specific for erosive joint
diseases. MMP-3 in SF is therefore a potential candidate for the assessment of
the inflammatory process in joints. However, the exclusive determination of the
active form could indicate the degree of joint destruction.
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