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D609, a phosphatidylcholine-specific phospholipase C inhibitor, blocks interleukin-1 beta-induced vascular cell

R R Cobb1, K A Felts, G C Parry

  • 1Biology Department, Tanabe Research Laboratories, San Diego, California 92121, USA.

Molecular Pharmacology
|June 1, 1996
PubMed

Insights

Phosphatidylcholine-specific phospholipase C is crucial for activating nuclear factor-kappa B and inducing vascular cell adhesion molecule 1 (VCAM-1) gene expression in endothelial cells during inflammation.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Endothelial cells regulate leukocyte recruitment during inflammation.
  • Cytokine induction of cell surface adhesion molecules, like vascular cell adhesion molecule 1 (VCAM-1), is a key mechanism.

Purpose of the Study:

  • To investigate the role of phosphatidylcholine-specific phospholipase C in interleukin-1 beta-induced VCAM-1 gene expression.
  • To determine if inhibiting phosphatidylcholine-specific phospholipase C affects VCAM-1 expression and its regulatory pathways.

Main Methods:

  • Utilized D609, a phosphatidylcholine-specific phospholipase C inhibitor, in human endothelial cells.
  • Assessed VCAM-1 cell surface expression and VCAM-1 promoter activity.
  • Examined nuclear translocation and transcriptional activity of nuclear factor-kappa B.

Main Results:

  • D609 significantly reduced VCAM-1 cell surface expression and promoter activity in a dose-dependent manner.
  • D609 did not impede nuclear factor-kappa B nuclear translocation.
  • D609 inhibited nuclear factor-kappa B-mediated transcription, indicating a role downstream of translocation.

Conclusions:

  • Phosphatidylcholine-specific phospholipase C is essential for the activation of nuclear factor-kappa B signaling.
  • This enzyme is required for cytokine-induced VCAM-1 gene expression in endothelial cells.
  • Targeting phosphatidylcholine-specific phospholipase C may offer a strategy to modulate inflammatory responses.

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