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Receptor Dissociation and B-Cell Activation.

Jianying Yang1,2,3,4, Michael Reth5,6

  • 1BIOSS Centre for Biological Signalling Studies, Department of Molecular Immunology, Biology III, University of Freiburg, Freiburg im Breisgau, Germany. yang@immunbio.mpg.de.

Current Topics in Microbiology and Immunology
|October 3, 2015
PubMed
Summary
This summary is machine-generated.

The B-cell antigen receptor (BCR) exists as oligomers, not monomers, on B cells. Activation involves opening these oligomers, challenging the traditional cross-linking model.

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Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • The B-cell antigen receptor (BCR) is vital for B cell activation and differentiation, with numerous copies per cell.
  • BCR signaling mechanisms are debated, particularly how diverse ligands trigger activation.
  • The long-standing cross-link model (CLM) has been challenged by recent nanoscale organization studies.

Purpose of the Study:

  • To review recent findings on BCR nanoscale organization and their impact on understanding BCR activation.
  • To discuss the implications of new data for BCR signaling mechanisms.
  • To contrast the cross-link model with the dissociation activation model (DAM).

Main Methods:

  • Analysis of nanoscale organization of BCR on resting B cell surfaces.
  • Review of recent experimental findings and their interpretation.
  • Theoretical discussion of BCR activation models.

Main Results:

  • BCR complexes on resting B cells are not randomly distributed monomers but form oligomers.
  • These BCR oligomers are confined within specific membrane domains.
  • Findings contradict the CLM's prediction of random monomer distribution.

Conclusions:

  • BCR activation likely involves the dissociation and opening of pre-formed, auto-inhibited oligomers (DAM).
  • This challenges the traditional view of BCR activation through ligand-induced cross-linking of monomers.
  • New models are needed to explain BCR signaling based on oligomeric organization and membrane confinement.