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Rheumatic syndromes associated with complement deficiency.

Maria-Louise Barilla-LaBarca1, John P Atkinson

  • 1Department of Medicine, State University of New York (SUNY) at StonyBrook, USA.

Current Opinion in Rheumatology
|December 24, 2002
PubMed
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Complement deficiencies in early classical pathway components frequently cause autoimmunity, particularly systemic lupus erythematosus. This review explores how complement defects impact immune complex handling and apoptotic cell clearance, contributing to autoimmune diseases.

Area of Science:

  • Immunology
  • Autoimmunity
  • Complement System Biology

Background:

  • Deficiencies in early classical complement pathway components (C1q, C1r/C1s, C4, C2) are strongly linked to autoimmunity, especially systemic lupus erythematosus (SLE).
  • The classical complement pathway plays a crucial role in immune complex clearance and the removal of cellular debris.

Purpose of the Study:

  • To summarize autoimmune manifestations associated with complement deficiency.
  • To present new data from targeted gene deletions of complement proteins.
  • To explore hypotheses linking complement defects to autoimmunity, including impaired immune complex handling and apoptotic cell clearance.

Main Methods:

  • Review of existing literature on complement deficiencies and autoimmune diseases.
  • Analysis of data from genetically modified mouse models with targeted deletions of specific complement proteins.

Related Experiment Videos

Main Results:

  • Complement deficiencies are consistently associated with an increased risk of developing autoimmune diseases, particularly SLE.
  • Impaired clearance of apoptotic cells, which display autoantigens on their surface, is a proposed mechanism linking complement defects to SLE pathogenesis.
  • Defects in the humoral immune response and regulation of autoreactive B cells are also implicated in the development of autoimmunity due to complement deficiencies.

Conclusions:

  • Early classical complement pathway deficiencies predispose individuals to autoimmunity through mechanisms involving immune complex handling and apoptotic cell clearance.
  • Targeted gene deletion studies provide valuable insights into the specific roles of complement proteins in maintaining self-tolerance and preventing autoimmune diseases.
  • Further research into the complement system's role in autoimmunity may reveal novel therapeutic targets for conditions like SLE.