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IgD ligation allows peritoneal cavity B cell proliferation.

Jennifer Londregan1, Jeffrey Maslanka1, Naomi Goldman1

  • 1Biology Department, Rider University, Lawrenceville, NJ 08648, USA.

Immunobiology
|January 25, 2022
PubMed
Summary

This study reveals that IgD ligation, unlike IgM, activates peritoneal cavity B cells. Concurrent IgD and CD3 ligation also restores T cell proliferation, offering new targets for immune modulation.

Keywords:
B cellCD3(ε)IgDMacrophagePeritoneal cavityT cellTumor microenvironment

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Area of Science:

  • Immunology
  • Tumor Microenvironment Research

Background:

  • Tumor microenvironments (TMEs) are characterized by atypical cytokine production and immune cell imbalances, notably high macrophage proportions.
  • Peritoneal cavity (PerC) cells, with their high macrophage-to-lymphocyte ratio, serve as a model for TMEs.
  • Macrophages typically inhibit lymphocyte proliferation upon T cell receptor (TCR) or B cell receptor (BCR) ligation, though PHA and anti-CD40 stimulation can induce proliferation.

Purpose of the Study:

  • To investigate novel activators of peritoneal cavity (PerC) B and T cells within a macrophage-rich model.
  • To explore the differential effects of IgD and IgM ligation on PerC B cell proliferation.
  • To assess the impact of IL-4 and concurrent IgD/CD3 ligation on PerC immune cell responses.

Main Methods:

  • Culturing peritoneal cavity (PerC) cells from mice.
  • Stimulating PerC cells with IgD, IgM, PHA, anti-CD40, and IL-4.
  • Analyzing T cell receptor (TCR) and B cell receptor (BCR) ligation effects.
  • Investigating the synergistic effect of IgD and CD3 ligation on T cell proliferation.

Main Results:

  • IgD ligation, in contrast to IgM, specifically triggers peritoneal cavity (PerC) B cell proliferation.
  • Interleukin-4 (IL-4) enhanced IgD-induced B cell responses in BALB/c mice but suppressed them in C57BL/6 mice.
  • Concurrent ligation of IgD and CD3 epsilon (CD3ε) restored T cell proliferative capacity in PerC cultures.

Conclusions:

  • IgD acts as a novel activator for peritoneal cavity (PerC) B cells.
  • The response to IgD ligation is strain-dependent and modulated by IL-4.
  • Combined IgD and CD3 ligation can overcome macrophage-mediated suppression of T cell proliferation.
  • These findings identify new targets for enhancing cellular and humoral immunity in models of macrophage-rich tumor microenvironments (TMEs).