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Bf and C3 complement types in rheumatoid arthritis.

S R Dahlqvist, G Beckman, L Beckman

    Human Heredity
    |January 1, 1985
    PubMed
    Summary
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    The study found a specific complement type, Bf, is less common in rheumatoid arthritis (RA) patients, especially males with severe RA or family history. Complement type C3 showed no association with RA.

    Area of Science:

    • Immunogenetics
    • Rheumatology

    Background:

    • Rheumatoid arthritis (RA) is a chronic autoimmune disease.
    • Complement system proteins, including Bf and C3, play a role in immune responses and have been investigated for associations with RA.
    • Previous studies suggested a link between RA and the C3F complement phenotype, but findings were inconsistent.

    Purpose of the Study:

    • To investigate the association between Bf and C3 complement phenotypes and erosive rheumatoid arthritis (RA) in a northern Swedish population.
    • To compare complement phenotypes in RA patients with healthy population controls.
    • To explore potential correlations between complement phenotypes and clinical parameters of RA severity and rheumatoid factor titers.

    Main Methods:

    • Case-control study involving 100 male and 100 female patients with erosive RA from northern Sweden.

    Related Experiment Videos

  • Comparison of Bf and C3 phenotype and gene frequencies between RA patients and population controls.
  • Analysis of associations between complement phenotypes and RA severity (functional classes III and IV), family history of polyarthritis, and rheumatoid factor titers.

    • Main Results:

    • A significantly decreased frequency of the Bf FS phenotype was observed in RA patients compared to controls, particularly in males.
    • The Bf FS phenotype was also less frequent in patients with a family history of polyarthritis.
    • Significant associations were found between certain Bf phenotypes and more severe RA (functional classes III and IV) and high rheumatoid factor titers.
    • No significant differences in C3 phenotype or gene frequencies were detected between RA patients and controls.
    • The previously reported association between RA and the C3F phenotype was not confirmed in this cohort.

    Conclusions:

    • The Bf complement phenotype, specifically the FS variant, is associated with rheumatoid arthritis in this northern Swedish population, particularly in males and those with severe disease or a family history.
    • The C3 complement type does not appear to be associated with rheumatoid arthritis in this study cohort.
    • These findings contribute to understanding the immunogenetic factors influencing RA susceptibility and severity.