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Levels of lectin pathway proteins in plasma and synovial fluid of rheumatoid arthritis and osteoarthritis

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Abstract

The innate immune system contributes to the development of rheumatoid arthritis (RA). A potent contributor to such processes is the complement system. The complement system is known to be activated in the inflammatory phases of osteoarthritis (OA). The lectin pathway of the complement system is activated through the recognition of pathogens or altered self-structures by mannan-binding lectin (MBL) or one of the three ficolins in collaboration with MBL-associated serine proteases (MASPs). We assessed the lectin pathway in plasma and synovial fluid (SF) of 27 RA patients and 30 OA patients by measuring MBL, MASP-2, MASP-3, M-ficolin, and H-ficolin. The concentration for all 5 proteins was significantly higher in plasma than in SF (P < 0.001) and the concentration in paired plasma and SF samples correlated in both RA and OA (significance levels between <0.001 and 0.02). The ratio of SF/plasma concentration was for all proteins significantly elevated in RA compared with OA patients (all P < 0.001). The M-ficolin concentration correlated with the neutrophils in both plasma (P = 0.01) and SF (P < 0.001) of RA, and in plasma of 78 controls (P = 0.03). To our knowledge, this is the first report on these proteins in SF, except for MBL where our results are in contrast to the one previous publication. The results support an important physiological role of the neutrophils in determining the M-ficolin levels in both RA and healthy adults. We suggest that quantifications of white blood cells should be included in future clinical investigations of M-ficolin.

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Acknowledgments

The Danish Rheumatism Association, The Fonden til Lægevidenskabens Fremme, The Hede Nielsen Foundation, The Aase and Ejnar Danielsens Foundation. Dept. of Clinical Immunology, Aarhus University Hospital—Skejby, Denmark, is thanked for very helpful inclusion of blood donor material.

Conflict of interest

The authors declare that they have no conflict of interest.

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Authors and Affiliations

  1. Department of Rheumatology, Aarhus University Hospital, Norrebrogade 44, 8000, Aarhus C, Denmark

    C. G. Ammitzboll, B. Deleuran, Anette Jorgensen & K. Stengaard-Pedersen

  2. Institute of Medical Microbiology and Immunology, Aarhus University, 8000, Aarhus C, Denmark

    S. Thiel & J. C. Jensenius

  3. Department of Medicine, Silkeborg Regional Hospital, 8600, Silkeborg, Denmark

    T. Ellingsen

Authors
  1. C. G. Ammitzboll
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  2. S. Thiel
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  3. T. Ellingsen
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  4. B. Deleuran
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  5. Anette Jorgensen
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  6. J. C. Jensenius
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  7. K. Stengaard-Pedersen
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Correspondence to C. G. Ammitzboll.

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Ammitzboll, C.G., Thiel, S., Ellingsen, T. et al. Levels of lectin pathway proteins in plasma and synovial fluid of rheumatoid arthritis and osteoarthritis. Rheumatol Int 32, 1457–1463 (2012). https://doi.org/10.1007/s00296-011-1879-x

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  • DOI: https://doi.org/10.1007/s00296-011-1879-x

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