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Related Experiment Videos

The complement system and adaptive immunity

D T Fearon1

  • 1Wellcome Trust Immunology Unit, University of Cambridge School of Clinical Medicine, Hills Road, Cambridge, CB2 2SP, UK.

Seminars in Immunology
|November 4, 1998
PubMed
Summary
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The complement system enhances adaptive immunity by marking antigens for B lymphocytes. Co-receptors on B cells determine immune response activation based on antigen characteristics.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • The complement system aids adaptive immunity by tagging microbial antigens with C3d, which binds to B lymphocyte receptor CR2.
  • This interaction enhances the adaptive immune response to the antigen via CR2-CD19 complex cross-linking with membrane immunoglobulin (mIg).

Purpose of the Study:

  • To elucidate the mechanisms by which B lymphocyte co-receptors modulate immune responses.
  • To understand how innate immunity signals influence adaptive immunity through B cell activation.

Main Methods:

  • Investigated the role of complement component C3d in B lymphocyte activation.
  • Analyzed the signaling pathways modulated by B cell co-receptors like CR2, FcgammaRIIB, and CD22 upon cross-linking with mIg.

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Main Results:

  • CR2-mediated C3d binding enhances B cell activation by augmenting intracellular signaling pathways.
  • FcgammaRIIB and CD22 act as inhibitory co-receptors, suppressing B cell signaling through recruitment of SHIP and SHP-1, respectively.

Conclusions:

  • Innate immunity plays a crucial role in guiding adaptive immune responses.
  • B lymphocyte activation is critically dependent on co-receptors that assess the biological properties of antigens.