Monocyte chemoattractant protein-4 (MCP-4)/CCL13 is highly expressed in cartilage from patients with rheumatoid arthritis

T. Iwamoto, H. Okamoto, N. Iikuni, M. Takeuchi, Y. Toyama, T. Tomatsu, N. Kamatani, S. Momohara

Research output: Contribution to journalArticlepeer-review

43 Citations (Scopus)


Objectives. To study the role of monocyte chemoattractant protein-4 (MCP-4)/CCL13 in the pathogenesis of rheumatoid arthritis (RA), we analysed the expression of MCP-4/CCL13 in chondrocytes, synovial fluid and serum from patients with RA and investigated the effect of MCP-4/ CCL13 on the proliferation of synovial cells. Methods. Human articular cartilage specimens were obtained from joints from RA and osteoarthritis (OA) patients and normal joints (controls). Transcript levels of MCP-4 in cartilage were determined by real-time polymerase chain reaction. Protein levels were measured by enzyme-linked immunoassay. Cultured fibroblast-like synoviocytes (FLS) were treated with various concentrations of recombinant MCP-4/CCL13 protein, and cell proliferation was evaluated with a viability assay. Results. The gene expression of MCP-4 was significantly higher in cartilage from RA patients than in that from OA patients (P = 0.00902) and in normal cartilage (P = 0.00902). The concentration of MCP-4/CCL13 protein in serum from RA patients (mean 94.7 ± 37.6pg/ml) was significantly higher than in serum from OA patients (mean 49.2 ± 31.2pg/ml, P = 0.0051) and controls (mean 32.6 ± 23.9pg/ml, P = 0.0001). The concentration of MCP-4/CCL13 protein in synovial fluid from RA patients (mean 247.2 ± 161.2/pg/ml) was also significantly higher than in that from OA patients (mean 29.6 ± 50.5pg/ml, P = 0.000019). Moreover, MCP-4/CCL13 enhanced the proliferation of FLS in a dose-dependent manner. Conclusions. MCP-4/CCL13 is highly expressed in RA joints at the mRNA and protein levels. Our results suggest that MCP-4/CCL13 is secreted from chondrocytes and activates the proliferation of rheumatoid synovial cells, thereby leading to joint destruction in RA.

Original languageEnglish
Pages (from-to)421-424
Number of pages4
Issue number4
Publication statusPublished - 2006 Apr


  • Chemokines
  • Monocyte chemoattractant protein-4
  • Rheumatoid arthritis

ASJC Scopus subject areas

  • Rheumatology
  • Pharmacology (medical)


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