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NF-kappaB activity marks cells engaged in receptor editing.

Emily J Cadera1, Fengyi Wan, Rupesh H Amin

  • 1Department of Molecular and Cell Biology, University of California, Berkeley, Berkeley, CA 94720, USA.

The Journal of Experimental Medicine
|July 8, 2009
PubMed
Summary

The study reveals that NF-kappaB signaling, potentially through IRF4, plays a crucial role in B cell receptor editing. This process helps prevent B cells from attacking the body's own antigens.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • B cells must develop tolerance to self-antigens due to diverse immunoglobulin genes.
  • Receptor editing is a key tolerance mechanism where B cells modify their B cell receptor (BCR) specificity upon encountering self-antigens.
  • NF-kappaB signaling is investigated for its potential role in regulating this critical immune tolerance process.

Purpose of the Study:

  • To investigate the role of NF-kappaB in the B cell receptor editing process.
  • To identify downstream targets of NF-kappaB involved in regulating receptor editing.
  • To understand how NF-kappaB contributes to preventing autoimmune responses.

Main Methods:

  • Utilized a heterozygous mutant mouse model (IkappaB alpha(+/lacZ)) with a lacZ reporter to track NF-kappaB activity.
  • Analyzed pre-B cells expressing either normal or self-specific BCRs.
  • Employed retroviral-mediated expression of an IkappaB alpha superrepressor in bone marrow cultures.
  • Measured gene expression levels of BCR components, RAG, and IRF4.

Main Results:

  • NF-kappaB activity, indicated by beta-gal expression, was elevated in pre-B cells undergoing receptor editing, particularly those with self-specific BCRs.
  • Inhibition of NF-kappaB signaling reduced germline kappa and rearranged lambda transcripts, key elements of receptor editing.
  • IRF4 transcripts were found to be upregulated in pre-B cells with high NF-kappaB activity.

Conclusions:

  • NF-kappaB signaling is implicated as a regulator of B cell receptor editing.
  • The transcription factor IRF4, a known target of NF-kappaB, is likely a key mediator in this pathway.
  • This pathway involving NF-kappaB and IRF4 is crucial for ensuring B cell tolerance to self-antigens and preventing autoimmunity.