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G protein-coupled receptor 174 (GPR174) deficiency protects against sepsis by enhancing regulatory T cell function and promoting anti-inflammatory macrophage polarization. This suggests GPR174 is a potential therapeutic target for sepsis and inflammatory disorders.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Pathology

Background:

  • G protein-coupled receptor 174 (GPR174) is implicated in autoimmune diseases, but its role in sepsis-induced inflammation is unknown.
  • Regulatory T cells (Treg cells) are crucial for immune homeostasis and sepsis resolution.
  • Sepsis involves a dysregulated inflammatory response, often leading to organ damage.

Purpose of the Study:

  • To investigate the function of GPR174 in Treg cells during sepsis.
  • To elucidate the mechanism by which GPR174 deficiency impacts sepsis outcomes.
  • To assess GPR174 as a potential therapeutic target for sepsis.

Main Methods:

  • Utilized Gpr174-deficient mice in lipopolysaccharide (LPS) and cecal ligation and puncture (CLP) sepsis models.
  • Analyzed Treg cell function, including expression of CTLA-4 and IL-10.
  • Investigated macrophage polarization (M2) and pro-inflammatory cytokine (IL-6, TNF-α) production in vitro and in vivo.

Main Results:

  • Gpr174-deficient mice exhibited resistance to LPS- and CLP-induced inflammatory shock.
  • GPR174 deficiency in Treg cells enhanced CTLA-4 and IL-10 expression.
  • Gpr174-deficient Treg cells promoted M2 macrophage polarization, reducing sepsis-induced lung damage and pro-inflammatory cytokine release.

Conclusions:

  • GPR174 regulates Treg cell function and macrophage polarization in sepsis.
  • GPR174 deficiency confers protection against sepsis by modulating inflammatory responses.
  • GPR174 represents a potential therapeutic target for managing sepsis and inflammatory conditions.