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EP4 mediates PGE2 dependent cell survival through the PI3 kinase/AKT pathway

Robert J George1, Mark A Sturmoski, Shrikant Anant

  • 1Washington University School of Medicine, Department of Internal Medicine, St. Louis, Missouri 63110, USA.

Prostaglandins & Other Lipid Mediators
|January 30, 2007
PubMed

Insights

Prostaglandin E2 (PGE2) protects human T-cell leukemia cells from chemotherapy-induced apoptosis via the EP4 receptor. This suggests potential therapeutic strategies targeting PGE2 signaling in cancer treatment.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Prostaglandin E2 (PGE2) is implicated in various physiological and pathological processes, including cancer.
  • Understanding the role of PGE2 in cancer cell survival is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the anti-apoptotic effects of PGE2 in human T-cell leukemia (Jurkat) cells.
  • To elucidate the specific receptor and downstream signaling pathways involved in PGE2-mediated cytoprotection.

Main Methods:

  • Jurkat cells were incubated with PGE2 (5 nM) before treatment with camptothecin.
  • Apoptosis was assessed by measuring caspase-3 activity and using flow cytometry with propidium iodide staining.
  • Pharmacological inhibitors of EP4 receptor, PI3 kinase, AKT/protein kinase, and protein kinase A were utilized.

Main Results:

  • PGE2 pre-incubation significantly reduced camptothecin-induced caspase-3 activity by 30% and apoptosis by 35%.
  • The EP4 receptor was identified as the mediator of PGE2's protective effect against camptothecin-induced apoptosis.
  • Inhibition of PI3 kinase or AKT/protein kinase, but not protein kinase A, blocked the cell survival effect of PGE2.

Conclusions:

  • PGE2 confers significant protection against chemotherapy-induced apoptosis in Jurkat cells.
  • The EP4 receptor and the PI3K/AKT signaling pathway are critical for mediating PGE2's anti-apoptotic effects.
  • Targeting EP4 receptor signaling presents a potential therapeutic avenue for enhancing cancer treatment efficacy.

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