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Related Experiment Videos

Epstein Barr virus/complement C3d receptor is an interferon alpha receptor.

A X Delcayre1, F Salas, S Mathur

  • 1California Institute for Biological Research, La Jolla 92037.

The EMBO Journal
|April 1, 1991
PubMed
Summary
This summary is machine-generated.

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Interferon alpha (IFN alpha) interacts with complement receptor type two (CR2) on B lymphocytes, suggesting CR2 may be a key receptor for IFN alpha. This interaction is blocked by antibodies and molecules that bind CR2.

Area of Science:

  • Immunology
  • Cell Biology
  • Virology

Background:

  • Interferon alpha (IFN alpha) is a cytokine with diverse biological functions.
  • Complement receptor type two (CR2/CD21) is involved in immune responses and binds complement fragments like C3d.
  • The receptor for IFN alpha on B lymphocytes has not been definitively identified.

Purpose of the Study:

  • To investigate the potential interaction between Interferon alpha and Complement Receptor type two.
  • To determine if CR2 acts as a receptor for IFN alpha on B lymphocytes.

Main Methods:

  • Peptide synthesis and antibody generation targeting specific binding motifs.
  • Inhibition assays using peptides, antibodies, and complement fragments to study molecular interactions.
  • Radioligand binding assays to quantify IFN alpha binding to B cells.

Related Experiment Videos

Main Results:

  • IFN alpha shares a CR2 binding motif with C3d, and antibodies against this motif bind IFN alpha.
  • IFN alpha and its derived peptide inhibit the interaction of C3bi/C3d with CR2 on Raji cells.
  • IFN alpha binding to Raji cells is inhibited by anti-CR2 antibodies and molecules that bind CR2.

Conclusions:

  • Interferon alpha directly interacts with Complement Receptor type two.
  • CR2 or CR2-like molecules are likely the primary receptors for IFN alpha on B lymphocytes.
  • This finding provides new insights into the mechanism of IFN alpha action on immune cells.