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Generation of Human CD40-activated B cells
13:27

Generation of Human CD40-activated B cells

Published on: October 17, 2009

Telomerase activity is induced in human peripheral B lymphocytes by the stimulation to antigen receptor

H Igarashi1, N Sakaguchi

  • 1Department of Immunology, Kumamoto University School of Medicine, Japan.

Blood
|February 15, 1997
PubMed

Insights

Telomerase activity is induced in human B cells upon activation of the B-cell antigen receptor (BCR). This induction requires costimulation, such as with anti-CD40, and is linked to B-cell proliferation.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cell Biology

Background:

  • B cells are crucial for adaptive immunity.
  • Telomerase activity is essential for cellular proliferation and genomic stability.
  • Understanding B cell activation is key to immune response research.

Purpose of the Study:

  • To investigate the induction of telomerase activity in human B cells.
  • To explore the molecular events regulating B cell proliferation via B-cell antigen receptor (BCR) stimulation.
  • To identify signaling pathways involved in telomerase induction during B cell activation.

Main Methods:

  • Human peripheral B cells were stimulated in vitro via BCR.
  • Telomerase activity was measured following stimulation with anti-IgM antibodies, cytokines (IL-2, IL-4, IL-13), and anti-CD40 monoclonal antibodies.
  • B cell proliferation was assessed.
  • The role of phosphoinositide 3-kinase (PI3K) was investigated.

Main Results:

  • Unstimulated B cells showed no detectable telomerase activity.
  • Anti-IgM beads induced telomerase activity.
  • Costimulation with cytokines or anti-CD40 was necessary when using soluble anti-IgM antibodies.
  • Telomerase induction correlated with B cell proliferation but not strictly with growth extent.
  • Phorbol dibutylate/calcium ionophore also induced telomerase activity.
  • PI3K signaling appears to play a role in this induction.

Conclusions:

  • Telomerase activity is induced during B cell activation, particularly in response to BCR stimulation and costimulatory signals.
  • This finding provides insights into the molecular mechanisms of B cell proliferation in antigen-specific immune responses.
  • The study highlights the role of specific signaling pathways in regulating telomerase in activated lymphocytes.

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