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C4b-binding protein (C4BP) inhibits development of experimental arthritis in mice.

På svenska

Author

  • Anna Blom
  • Kutty S Nandakumar
  • Rikard Holmdahl

Summary, in English

OBJECTIVES: To assess the human complement inhibitor C4b-binding protein (C4BP) for treatment of arthritis. METHODS: We have used two mouse models of rheumatoid arthritis (RA) to assess the therapeutic effect of C4BP on different phases of arthritis, the collagen antibody induced arthritis (CAIA), an acute antibody induced disease and the collagen induced arthritis (CIA), which carries the full complexity of arthritis. RESULTS: Purified human C4BP injected intraperitoneally alleviated CAIA significantly in a manner similar to cobra venom factor that depletes complement due to massive activation. Furthermore, C4BP was injected before and after the disease development into CIA mice. In the former case, the disease onset was delayed and in the latter, the severity of the disease was reduced in animals treated with C4BP. However, C4BP did not affect the anti-CII antibody synthesis. C4BP present in mouse sera decreased activity of the classical but not the alternative pathway of the complement system when these were assessed in a fluid phase. However, C4BP was efficiently inhibiting the alternative pathway when present on the activating surface. Taken together, the disease ameliorating effect of C4BP appears to be related to inhibition of both pathways of complement. CONCLUSIONS: Although human C4BP was cleared relatively fast from the circulation and was only moderately affecting complement activity, its effect on the disease severity was substantial, suggesting that minor alterations in complement activity can have significant therapeutic value in RA.

Department/s

Publishing year

2009

Language

English

Pages

136-142

Publication/Series

Annals of the Rheumatic Diseases

Volume

68

Document type

Journal article

Publisher

BMJ Publishing Group

Topic

  • Rheumatology and Autoimmunity

Status

Published

Research group

  • Protein Chemistry, Malmö
  • Immunology

ISBN/ISSN/Other

  • ISSN: 1468-2060