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Serum COMP-C3b complexes in rheumatic diseases and relation to anti-TNF-α treatment

Kaisa E Happonen1, Tore Saxne, Pierre Geborek

  • 1Department of Laboratory Medicine Malmö, Section of Medical Protein Chemistry, Lund University, Wallenberg Laboratory floor 4, SE-205 02 Malmö, Sweden.

Arthritis Research & Therapy
|January 24, 2012
PubMed

Insights

Cartilage oligomeric matrix protein-C3b (COMP-C3b) complexes are elevated in various joint diseases, including rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). COMP-C3b levels correlate with RA disease activity and change with TNF-α inhibitor treatment.

Area of Science:

  • Rheumatology
  • Immunology
  • Biochemistry

Background:

  • Cartilage oligomeric matrix protein (COMP) is elevated in joint diseases like rheumatoid arthritis (RA) and osteoarthritis (OA).
  • COMP activates the complement system's alternative pathway, forming COMP-C3b complexes found in RA patients' sera.

Purpose of the Study:

  • To investigate COMP-C3b levels in larger patient cohorts across various rheumatologic diseases.
  • To explore the clinical significance and disease correlations of COMP-C3b as a potential biomarker.

Main Methods:

  • Serum COMP-C3b levels were quantified using an enzyme-linked immunosorbent assay (ELISA).
  • Serum COMP levels were also measured via ELISA.

Main Results:

  • COMP-C3b was significantly elevated in RA, systemic lupus erythematosus (SLE), ankylosing spondylitis (AS), psoriatic arthritis (PsA), and osteoarthritis (OA).
  • COMP-C3b levels correlated with disease activity in RA and showed distinct changes during anti-tumor necrosis factor (TNF)-α therapy compared to C-reactive protein (CRP).
  • COMP-C3b levels did not correlate with COMP levels in any patient group.

Conclusions:

  • COMP-C3b serves as a valuable biomarker elevated across multiple inflammatory rheumatologic conditions.
  • COMP-C3b dynamics during anti-TNF-α therapy suggest it reflects disease-specific features beyond general inflammation markers like CRP.
Abstract

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