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Immune function of C1q and its modulators CD91 and CD93.

Joanna Tarr1, Paul Eggleton

  • 1Institute of Biomedical and Clinical Sciences, Peninsula Medical School, Universities of Exeter and Plymouth, Exeter, Devon EX1 2LU, UK.

Critical Reviews in Immunology
|September 20, 2005
PubMed
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Complement component C1q plays a key role in the immune system. This review explores how CD91 and CD93 interact with C1q to facilitate cellular debris clearance and phagocytosis.

Area of Science:

  • Immunology
  • Molecular Biology
  • Structural Biology

Background:

  • C1q is a crucial component of the classical complement pathway, initiating immune responses.
  • Recent structural and genetic studies have illuminated C1q's diverse immune functions.
  • C1q's roles in apoptotic clearance and phagocytosis are areas of intense research interest.

Purpose of the Study:

  • To review structural and functional data on C1q.
  • To explore the roles of CD91 and CD93 in C1q-mediated functions.
  • To provide an overview of C1q's interactions with its proposed receptors.

Main Methods:

  • Literature review of structural and functional studies on C1q.
  • Analysis of gene deletion studies involving C1q.

Related Experiment Videos

  • Examination of proposed interactions between C1q and transmembrane proteins CD91 and CD93.

    • Main Results:

    • Partial crystal structure of C1q has been determined.
    • C1q deletion studies reveal its multifunctional immune roles.
    • CD91 and CD93 are implicated in C1q-mediated apoptotic clearance and phagocytosis, respectively.

    Conclusions:

    • CD91 and CD93 are proposed to interact indirectly with C1q.
    • These interactions are critical for efficient apoptotic debris clearance and phagocytosis.
    • Further research is needed to fully elucidate the mechanisms of C1q-receptor interactions.