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Effects of phosphoinositide cycle modifiers on apoptosis of peritoneal macrophages

O N Aksenova1, V A Trofimov, T N Lychkina

  • 1N. P. Ogarev Mordovian State University, Saransk.

Bulletin of Experimental Biology and Medicine
|September 30, 2004
PubMed

Insights

Hydrogen peroxide (H2O2) triggers programmed cell death in macrophages. Modifying phosphoinositide metabolism affects H2O2

Area of Science:

  • Cell Biology
  • Immunology
  • Biochemistry

Background:

  • Macrophages play a crucial role in immune responses.
  • Programmed cell death (apoptosis) is essential for tissue homeostasis and eliminating defective cells.
  • Phosphoinositide metabolism is critical for cellular signaling and regulation.

Purpose of the Study:

  • To investigate the role of hydrogen peroxide (H2O2) in macrophage apoptosis.
  • To determine how phosphoinositide cycle modifiers influence H2O2-induced cell death.
  • To explore the link between phosphoinositide metabolism and programmed cell death in macrophages.

Main Methods:

  • Zymosan-activated rat peritoneal macrophages were utilized.
  • Hydrogen peroxide (H2O2) was applied at varying concentrations (1 mM and 10 mM).
  • Phosphoinositide cycle modifiers were used to modulate cellular responses.

Main Results:

  • Hydrogen peroxide (H2O2) was found to stimulate apoptosis in activated macrophages.
  • Low H2O2 concentrations (1 mM) enhanced the proapoptotic effect when combined with phosphoinositide modifiers.
  • High H2O2 concentrations (10 mM) promoted necrosis, with effects modulated by phosphoinositide agents.
  • Disruptions in phosphoinositide metabolism were associated with impaired cellular responses and programmed cell death.

Conclusions:

  • Hydrogen peroxide concentration is a critical factor in determining macrophage cell fate (apoptosis vs. necrosis).
  • Modulation of phosphoinositide metabolism can influence the outcome of H2O2-induced cell death.
  • Defective cell removal may be linked to dysregulated phosphoinositide pathways and impaired responses to inflammatory stimuli.

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