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Release of prostaglandins from human polymorphonuclear leukocytes

R B Zurier1, D M Sayadoff

  • 1Division of Rheumatic Diseases, Department of Medicine, University of Connecticut School of Medicine, Farmington, Connecticut.

Inflammation
|November 7, 2013
PubMed

Insights

Human neutrophils (PMNs) release prostaglandins during zymosan-induced phagocytosis. Prostaglandin E1 is most abundant, and their release is inhibited by indomethacin and aspirin, suggesting synthesis by PMNs to regulate inflammation.

Area of Science:

  • Immunology
  • Cell Biology
  • Biochemistry

Background:

  • Human polymorphonuclear neutrophils (PMNs) are key immune cells involved in inflammatory responses.
  • Prostaglandins are lipid compounds with diverse physiological roles, including inflammation modulation.

Purpose of the Study:

  • To investigate the release and synthesis of prostaglandins by human PMNs during phagocytosis.
  • To determine the types and relative concentrations of prostaglandins released.
  • To explore the role of cyclic AMP in prostaglandin release.

Main Methods:

  • Exposure of human PMNs to zymosan particles to stimulate phagocytosis.
  • Measurement of prostaglandin E (PGE) and F (PGF) in the surrounding medium using radioimmunoassay.
  • Inhibition studies using indomethacin and aspirin to assess prostaglandin synthesis.
  • Addition of dibutyryl cyclic 3',5'-adenosine monophosphate (dBcAMP) to evaluate its effect on prostaglandin release.

Main Results:

  • Human PMNs released both PGE and PGF into the medium after zymosan exposure.
  • PGE1 was the predominant prostaglandin, with a PGE/PGF ratio of approximately 3:1.
  • Prostaglandin release was inhibited by indomethacin and aspirin, indicating de novo synthesis by PMNs.
  • Addition of dBcAMP significantly increased prostaglandin release during zymosan ingestion.

Conclusions:

  • Human PMNs synthesize prostaglandins during phagocytosis.
  • The release of prostaglandins by PMNs may play a role in regulating the inflammatory response.
  • Cyclic AMP signaling may influence prostaglandin production and release in phagocytic cells.

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