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Prostaglandin E2 receptors EP2 and EP4 are down-regulated in human mononuclear cells after injury

V E Strong1, J Winter, Z Yan

  • 1Department of Surgery, New York Presbyterian Hospital-Weill Medical College of Cornell Univerity, New York, NY 10021, USA.

Surgery
|August 8, 2001
PubMed
Abstract

Insights

Injury down-regulates prostaglandin E2 (PGE2) receptors EP2 and EP4. Blocking PGE2 production restores receptor expression, suggesting EP receptor targets for immune response augmentation after injury.

Area of Science:

  • Immunology
  • Molecular Biology
  • Prostanoid Signaling

Background:

  • Prostaglandin receptor subtypes are crucial for cellular functions.
  • Distinct signaling pathways of prostanoids may explain their varied effects.
  • Understanding EP receptor modulation post-injury is vital for immune response insights.

Purpose of the Study:

  • To investigate EP2 and EP4 prostaglandin receptor modulation following injury.
  • To assess the impact of prostaglandin E2 (PGE2) addition and blockade on EP receptor expression.

Main Methods:

  • Peripheral blood mononuclear cells (PBMCs) from injured patients and controls were analyzed.
  • PGE2 production, tumor necrosis factor-alpha, and leukotriene B4 were measured.
  • EP receptor and COX-2 mRNA expression were evaluated, alongside PGE2 treatment effects.

Main Results:

  • Injured patients showed increased PGE2 production and COX-2 mRNA, inhibited by NS-398.
  • EP2 and EP4 receptors were significantly down-regulated post-injury.
  • PGE2 addition replicated the down-regulation of EP2 and EP4 receptors.

Conclusions:

  • Specific PGE2 receptors (EP2, EP4) are down-regulated after injury.
  • NS-398 treatment reversed this down-regulation, indicating PGE2's role.
  • EP receptor subtypes represent potential targets for enhancing human immune responses post-injury.

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