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CD154 Restricts Helminth-Induced Macrophage Polarisation and Proliferation While Promoting Tissue Residence.

Mariana Suárez-Martins1,2, James Parkinson2, Lili Zhang2

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CD154 (CD40L) limits macrophage polarization and proliferation during helminth infections. Blocking CD154 enhances type 2 responses and promotes recruited macrophages adopting a tissue-resident phenotype.

Keywords:
T‐lymphocytescell differentiationcell proliferationhelminthsinterleukin‐4macrophagesperitoneal cavity

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Area of Science:

  • Immunology
  • Cell Biology
  • Parasitology

Background:

  • CD154 (CD40L) is crucial for classical macrophage activation.
  • Its role in type 2 immune responses, particularly during helminth infections, is less understood.
  • Type 2 immunity involves IL-4-driven macrophage polarization and proliferation.

Purpose of the Study:

  • To investigate the impact of CD154 on peritoneal macrophages during Heligmosomoides polygyrus infection.
  • To determine how CD154 influences macrophage polarization, proliferation, and tissue residence in a type 2 context.

Main Methods:

  • Infection of mice with the helminth Heligmosomoides polygyrus.
  • Monitoring of peritoneal cavity for Th2 cells and macrophages.
  • Blocking CD154 activity and assessing macrophage proliferation and type 2 marker expression (Ym1).
  • Analysis of macrophage phenotype, including folate receptor β, MHCII, F4/80, and CD102 expression.

Main Results:

  • CD154 blocking enhanced resident macrophage proliferation and potentiated Ym1 expression in both resident and recruited macrophages.
  • Blocking CD154 increased the number of recruited macrophages and induced cells with mixed resident and differentiating macrophage characteristics.
  • CD154 signaling appears to restrict certain macrophage polarization and proliferation aspects in type 2 immunity.

Conclusions:

  • CD154 plays a dual role in type 2 immune responses during helminth infection.
  • It restricts some macrophage polarization and proliferation but promotes the acquisition of tissue-resident properties by recruited macrophages.