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Related Concept Videos

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T Cell Activation and Clonal Selection

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Related Experiment Video

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Generation of Human CD40-activated B cells
13:27

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Published on: October 16, 2009

Tracking CD40 signaling during germinal center development.

Katia Basso1, Ulf Klein, Huifeng Niu

  • 1Institute for Cancer Genetics, Department of Pathology and Genetics and Development, Joint Centers for Systems Biology, Columbia University, 1150 St Nicholas Ave, New York, NY 10032, USA.

Blood
|August 28, 2004
PubMed
Summary

CD40 signaling is crucial for B-cell development but surprisingly absent during germinal center (GC) expansion. This pathway may primarily function in the initial and final stages of the GC reaction.

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13:27

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Published on: October 16, 2009

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12:24

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Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • CD40 receptor signaling is essential for germinal center (GC) and memory B-cell formation.
  • The precise timing of CD40 pathway activation during B-cell development in vivo remains unclear.

Purpose of the Study:

  • To investigate the specific stages of B-cell development where CD40 signaling is active in vivo.
  • To identify the CD40 gene expression signature and its presence in normal B-cell populations.

Main Methods:

  • Induced CD40 signaling in human transformed GC B cells in vitro.
  • Utilized DNA microarray analysis to identify a CD40 gene expression signature.
  • Examined gene expression profiles of normal B cells and validated findings in lymphoid tissues using NF-kappaB subunit staining.

Main Results:

  • A CD40 gene expression signature was identified in pre- and post-GC B cells (naive and memory), but notably absent in GC B cells.
  • Nuclear factor-kappaB (NF-kappaB) transcription factors, indicative of CD40 signaling, were retained in the cytoplasm of most GC B cells.
  • A subset of centrocytes and subepithelial B cells showed nuclear NF-kappaB staining, suggesting potential CD40 pathway activation or alternative NF-kappaB activation.

Conclusions:

  • Germinal center expansion occurs independently of active CD40 signaling.
  • CD40 signaling likely plays a role in the initial and terminal phases of the germinal center reaction.
  • NF-kappaB activation in certain B-cell subsets suggests alternative signaling pathways or limited CD40 engagement.