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Related Experiment Videos

Complement and systemic lupus erythematosus.

Mark J Walport1

  • 1Division of Medicine, Imperial College of Science, Technology and Medicine, London, UK. m.walport@ic.ac.uk

Arthritis Research
|July 12, 2002
PubMed
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The complement system plays a dual role in systemic lupus erythematosus (SLE), influencing disease susceptibility and inflammation. Deficiencies in complement proteins increase SLE risk, while complement activation contributes to disease severity, particularly with anti-C1q autoantibodies.

Area of Science:

  • Immunology
  • Rheumatology

Background:

  • The complement system is a critical component of innate immunity.
  • Systemic lupus erythematosus (SLE) is a chronic autoimmune disease with complex pathogenesis.
  • The role of complement in SLE has been described as paradoxical, acting as both a protective and detrimental factor.

Purpose of the Study:

  • To review the multifaceted role of the complement system in the pathogenesis of SLE.
  • To explore the complex relationship between complement activation, deficiency, and autoantibody production in SLE.
  • To present hypotheses explaining the dual role of complement in SLE.

Main Methods:

  • Literature review of complement's involvement in SLE.
  • Analysis of genetic associations between complement deficiencies and SLE susceptibility.

Related Experiment Videos

  • Examination of complement's role in SLE effector mechanisms and autoantibody responses.

    • Main Results:

    • Homozygous deficiencies in classical complement pathway proteins are linked to SLE susceptibility.
    • Complement proteins deposit in inflamed tissues during SLE flares.
    • Inhibition of C5 has shown therapeutic potential in murine SLE models.
    • Autoantibodies against complement proteins, notably C1q, are associated with severe SLE manifestations like glomerulonephritis.

    Conclusions:

    • The complement system significantly influences SLE pathogenesis through both protective and pathogenic mechanisms.
    • Complement deficiencies predispose individuals to SLE, while its activation contributes to disease progression and inflammation.
    • Anti-C1q autoantibodies are a marker of severe SLE and indicate a complex interplay between autoantibodies and the complement system.