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Related Experiment Videos

CD69-induced monocyte apoptosis involves multiple nonredundant signaling pathways

R Ramírez1, J Carracedo, M Castedo

  • 1Unidad de Investigación, Hospital Reina Sofía, Córdoba, Spain.

Cellular Immunology
|September 15, 1996
PubMed
Summary
This summary is machine-generated.

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Simultaneous stimulation of monocytes/macrophages with LPS and anti-CD69 triggers apoptosis through three independent pathways: arachidonic acid metabolism, nitric oxide (NO) generation, and pertussis toxin (PTX)-sensitive events, each crucial for cell death.

Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Signaling

Background:

  • Human monocytes/macrophages and THP1 cells undergo apoptosis when stimulated with lipopolysaccharide (LPS) and anti-CD69 antibody.
  • Activation-induced apoptosis in myelomonocytic cells is a complex process involving multiple signaling pathways.

Purpose of the Study:

  • To elucidate the independent signaling pathways involved in LPS/anti-CD69-induced apoptosis in monocytes/macrophages.
  • To determine the necessity and sufficiency of individual signaling components in apoptosis induction.

Main Methods:

  • Inhibition of phospholipase A2, lipoxygenase, nitric oxide (NO) generation, and pertussis toxin (PTX)-sensitive G-protein signaling.
  • Assessment of apoptosis induction, TNF production, NO generation, and arachidonic acid metabolism.

Related Experiment Videos

  • Utilizing PTX and a catalytically inactive mutant toxin (mPTX) to dissect signaling roles.

    • Main Results:

    • Inhibitors of phospholipase A2, lipoxygenase, and PTX, as well as NO generation inhibition, all prevent apoptosis.
    • These three pathways (arachidonic acid metabolism, NO, and PTX-sensitive events) are independent, as interventions in one do not affect the others.
    • LPS and anti-CD69 alone activate cells but do not induce apoptosis; all three pathways are necessary but insufficient individually.

    Conclusions:

    • Apoptosis induction by LPS/anti-CD69 requires the coordinated action of at least three distinct and independent signaling pathways.
    • These findings highlight the intricate regulation of activation-induced apoptosis in monocytes and macrophages.