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The murine TRAIL receptor signals caspase-independent cell death through ceramide

Lutz Thon1, Sabine Mathieu, Dieter Kabelitz

  • 1Institut für Immunologie, Universitätsklinikum Schleswig-Holstein Campus Kiel, Michaelisstr. 5, 24105 Kiel, Germany.

Experimental Cell Research
|October 10, 2006
PubMed

Insights

Murine TRAIL-R2 induces caspase-independent programmed cell death (PCD) via ceramide, similar to TNF-R55 pathways. This discovery reveals a new role for ceramide in death receptor-mediated cell death.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Immunology

Background:

  • Death receptors initiate programmed cell death (PCD) through caspase-dependent or -independent pathways.
  • Tumor necrosis factor (TNF) receptor (TNF-R55) and Fas are known inducers of PCD.
  • The role of murine (TNF)-related apoptosis-inducing ligand receptor 2 (mTRAIL-R2) in caspase-independent PCD is not fully understood.

Purpose of the Study:

  • To investigate the capacity of mTRAIL-R2 to induce caspase-independent PCD.
  • To compare the mechanisms of mTRAIL-R2 and TNF-R55 in eliciting caspase-independent PCD.
  • To identify key mediators in TRAIL-induced caspase-independent PCD.

Main Methods:

  • Morphological and cellular analysis of PCD.
  • Overexpression of acid ceramidase (AC) in cells.
  • Comparison of cell survival following TRAIL and TNF stimulation.

Main Results:

  • mTRAIL-R2 induces both apoptosis and a novel form of caspase-independent PCD with necrosis-like features.
  • mTRAIL-R2 and TNF-R55 utilize similar pathways for caspase-independent PCD, independent of cathepsins.
  • Overexpression of acid ceramidase enhances cell survival from TRAIL-induced caspase-independent PCD, but not apoptosis.
  • Ceramide is implicated as a key mediator in mTRAIL-R2 and TNF-R55-induced caspase-independent PCD.

Conclusions:

  • mTRAIL-R2 is a novel inducer of caspase-independent PCD.
  • Ceramide plays a crucial role in mediating death receptor-induced caspase-independent PCD.
  • These findings provide new insights into the complex mechanisms of programmed cell death.

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