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Related Concept Videos

Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
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Types of Receptors: Cell Surface Receptors

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Receptor tyrosine kinases or RTKs are membrane-bound receptors that phosphorylate specific tyrosine on protein substrates. RTKs regulate cellular growth, differentiation, survival, and migration. They contain an extracellular ligand binding domain, a transmembrane domain, and a cytosolic tail with intrinsic kinase activity. Several extracellular signaling molecules activate RTKs in one or more ways and relay the signal downstream. Ligands such as platelet-derived growth factor (PDGF) or...
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Optimizing the Genetic Incorporation of Chemical Probes into GPCRs for Photo-crosslinking Mapping and Bioorthogonal Chemistry in Live Mammalian Cells
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The pre-B-cell receptor.

Inga-Lill Mårtensson1, Rebecca A Keenan, Steve Licence

  • 1Laboratory of Lymphocyte Signaling and Development, The Babraham Institute, The Babraham Campus, Cambridge CB2 4AT, United Kingdom. lill.martensson@bbsrc.ac.uk <lill.martensson@bbsrc.ac.uk>

Current Opinion in Immunology
|February 20, 2007
PubMed
Summary

The pre-B-cell receptor (pre-BCR) is crucial for B-cell development, mediating key signaling events. However, recent findings indicate some of these processes may occur earlier and independently of pre-BCR signaling.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Development

Background:

  • The pre-B-cell receptor (pre-BCR) is essential for B-cell development, acting as a critical checkpoint.
  • It comprises immunoglobulin mu heavy chains, surrogate light chains, and signaling molecules Igalpha/beta.
  • Pre-BCR signaling regulates heavy chain allelic exclusion, recombination, proliferation, and V(H) repertoire selection.

Purpose of the Study:

  • To investigate the precise role and timing of pre-BCR signaling in B-cell development.
  • To explore whether processes regulated by the pre-BCR can occur independently of its signaling.
  • To refine the current model of early B-cell differentiation.

Main Methods:

  • Analysis of gene expression patterns during early B-cell development.
  • Investigating signaling pathways in pre-BCR deficient or non-functional models.
  • Utilizing flow cytometry and molecular assays to assess cellular processes.

Main Results:

  • Evidence suggests that some pre-BCR-mediated events, such as heavy chain allelic exclusion and developmental progression, might initiate before functional pre-BCR expression.
  • Certain developmental processes appear to proceed even in the absence of robust pre-BCR signaling.
  • Down-regulation of surrogate light chain genes may not solely depend on pre-BCR signals.

Conclusions:

  • The current model of B-cell development requires revision regarding the initiation timing and signaling dependence of key regulatory events.
  • Some critical steps in B-cell maturation may be initiated by alternative pathways or occur at earlier developmental stages.
  • Further research is needed to elucidate the full spectrum of signals governing early B-cell fate decisions.