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Göteborgs universitets publikationer

Expression and functional properties of antibodies to tissue inhibitors of metalloproteinases (TIMPs) in rheumatoid arthritis

Författare och institution:
Maria Bokarewa (Institutionen för invärtesmedicin, Avdelningen för reumatologi och inflammationsforskning); L. Dahlberg (-); Andrej Tarkowski (Institutionen för invärtesmedicin, Avdelningen för reumatologi och inflammationsforskning)
Publicerad i:
Arthritis Res Ther, 7 ( 5 ) s. R1014-22
1478-6362 (Electronic)
Artikel, refereegranskad vetenskaplig
Sammanfattning (abstract):
Tissue inhibitors of matrix metalloproteinases (TIMPs) regulate the breakdown of extracellular matrix components and play an important role in tissue remodelling and growth, in both physiological and pathological conditions. We studied the autoimmune response to TIMPs in patients with rheumatoid arthritis (RA). Eighty-nine paired blood and synovial fluid samples from patients with RA were assessed for their reactivity with recombinant tissue inhibitors of metalloproteinases (TIMPs) 1 to 4 by an ELISA and were compared with blood from 62 healthy controls and 21 synovial fluid samples from patients with degenerative joint diseases. Presence of antibodies was established as the absorbance of the sample more than 2 standard deviations above the mean of the controls. In addition, immunoglobulin G (IgG) from blood samples of RA patients possessing TIMP antibodies was isolated on protein A-sepharose and tested for the in vitro ability to neutralize TIMP-2-dependent effects on metalloproteinase 9 (MMP9). Anti-TIMP antibodies were found in 56% of RA samples but in only 5% of the controls (P < 0.005). RA patients had high frequencies of antibodies against all TIMPs except TIMP-3. TIMP-2 antibodies were most frequently found (33%), being significantly more prevalent (P = 0.024) in patients with nonerosive than erosive RA. TIMP-1 antibodies were significantly more often found in synovial fluid samples than in the matched blood samples (P < 0.025). Importantly, the IgG fraction containing TIMP antibodies down-regulated the TIMP-2 inhibitory effect, thereby supporting MMP9 activity in vitro. In the present study, we show that RA patients frequently develop autoimmune response to TIMPs that may act as a functionally significant regulator of MMP activity and thereby of joint destruction.
Ämne (baseras på Högskoleverkets indelning av forskningsämnen):
Adolescent, Adult, Aged, Aged, 80 and over, Antirheumatic Agents/therapeutic use, Arthritis, Rheumatoid/drug therapy/*immunology/radiography, Autoantibodies/analysis/biosynthesis/blood/*immunology/isolation &, purification, Autoantigens/*immunology, Autoimmune Diseases/drug therapy/*immunology/radiography, Blood Sedimentation, C-Reactive Protein/analysis, Drug Therapy, Combination, Enzyme-Linked Immunosorbent Assay, Female, Humans, Immunoglobulin G/analysis/biosynthesis/blood/immunology/isolation &, purification, Male, Matrix Metalloproteinase 9/analysis, Middle Aged, Synovial Fluid/immunology, Tissue Inhibitor of Metalloproteinase-1/immunology, Tissue Inhibitor of Metalloproteinase-2/antagonists &, inhibitors/immunology/physiology, Tissue Inhibitor of Metalloproteinases/*antagonists &, inhibitors/immunology
Postens nummer:
Posten skapad:
2007-07-02 14:06
Posten ändrad:
2011-01-20 10:00

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