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Complement regulatory proteins and autoimmunity.

M Kawano1

  • 1Second Department of Internal Medicine, School of Medicine, Kanazawa University, Japan. kawano@lilac.ocn.ne.jp

Archivum Immunologiae Et Therapiae Experimentalis
|January 5, 2001
PubMed
Summary
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Complement regulatory proteins protect cells from injury but decrease on apoptotic cells. This dual role in inflammation suggests therapeutic potential for autoimmune diseases.

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • The immune system must distinguish self from non-self to prevent damage.
  • Complement regulatory proteins (CR1, MCP, DAF, CD59) protect autologous cells from complement-mediated injury.
  • These proteins are upregulated in autoimmune diseases and by cytokines like interferon-gamma and TNF-alpha.

Purpose of the Study:

  • To investigate the dual roles of complement regulatory proteins at inflammatory sites.
  • To explore the therapeutic potential of these proteins in autoimmune diseases.

Main Methods:

  • Review of existing literature on complement regulatory proteins.
  • Analysis of in vitro assays examining protein regulation by immune complexes and cytokines.
  • Observation of protein expression on apoptotic cells.

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Main Results:

  • Complement regulatory proteins are upregulated in inflammatory and autoimmune conditions.
  • Expression of these proteins decreases on apoptotic autologous cells.
  • These proteins exhibit dual functions: enhancing cellular resistance and promoting clearance of injurious cells.

Conclusions:

  • Complement regulatory proteins play a critical role in managing complement-mediated damage during inflammation.
  • Their dual functions suggest a promising therapeutic strategy for autoimmune diseases using recombinant soluble forms.