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Related Experiment Videos

Pneumococcal polysaccharides complexed with C3d bind to human B lymphocytes via complement receptor type 2.

A W Griffioen1, G T Rijkers, P Janssens-Korpela

  • 1Department of Immunology, University Hospital for Children, Utrecht, The Netherlands.

Infection and Immunity
|May 1, 1991
PubMed
Summary

The complement system aids antibody production by binding C3d fragments to pneumococcal polysaccharides (PS). This C3d-PS complex activates B cells via complement receptor type 2, enhancing immune responses to T-cell-independent antigens.

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Area of Science:

  • Immunology
  • Complement System Biology
  • B-cell Activation

Background:

  • The complement system regulates immune responses, with C3 fragments influencing B-lymphocyte functions.
  • Pneumococcal polysaccharides (PS) activate the complement system's alternative pathway.

Purpose of the Study:

  • To investigate the role of complement factor C3 fragments in the immune response to pneumococcal polysaccharides (PS).
  • To determine if C3d can bind to PS antigens and influence B-cell recognition and antibody production.

Main Methods:

  • Analysis of C3d binding to PS antigens using sera from C1q-deficient patients and healthy subjects.
  • Assessment of PS-C3d complex recognition by B cells expressing complement receptor type 2 (CR2).
  • Evaluation of the immunogenicity of PS4 complexed with C3d compared to free PS4.

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Main Results:

  • C3d, a C3 split product, binds to PS antigens independently of specific antibodies.
  • PS-C3d complexes are recognized by B cells through complement receptor type 2 (CR2).
  • Treatment blocking CR2's C3d-binding site reduced PS-C3d binding to B cells.
  • PS4 complexed with C3d showed enhanced immunogenicity compared to free PS4.

Conclusions:

  • The complement system, specifically C3d binding to PS, plays a regulatory role in activating PS-specific B cells.
  • This interaction, mediated by CR2 on B cells, enhances the antibody response to T-cell-independent type 2 antigens like PS.