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TRAIL-induced apoptosis of human melanoma cells involves activation of caspase-4

Zhi Gang Mao1, Chen Chen Jiang, Fan Yang

  • 1Immunology and Oncology Unit, Newcastle Misericordiae Hospital, Room 443, David Maddison Clinical Sciences Building, Cnr. King and Watt Streets, Newcastle, NSW, 2300, Australia.

Apoptosis : an International Journal on Programmed Cell Death
|June 2, 2010
PubMed

Insights

Caspase-4 activation contributes to programmed cell death (apoptosis) in melanoma cells treated with tumor necrosis factor-related apoptosis-inducing ligand (TRAIL). This process involves endoplasmic reticulum (ER) stress and may enhance TRAIL

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Cancer Research

Background:

  • Caspase-4 is conventionally viewed as an inflammatory caspase.
  • Recent research suggests caspase-4's involvement in apoptosis induction via endoplasmic reticulum (ER) stress.
  • The precise role of caspase-4 in TNF-related apoptosis-inducing ligand (TRAIL)-mediated apoptosis requires further elucidation.

Purpose of the Study:

  • To investigate the role of caspase-4 activation in TRAIL-induced apoptosis in human melanoma cells.
  • To determine the relationship between TRAIL-induced ER stress and caspase-4 activation.
  • To explore the potential feedback mechanisms involving caspase-4 in apoptosis signaling.

Main Methods:

  • Treatment of human melanoma cells with TRAIL.
  • Assessment of caspase activation (caspase-3, -4, -8, -9) using biochemical assays.
  • Monitoring of ER stress markers, including GRP78 protein and spliced XBP-1 mRNA.
  • Inhibition of caspase-3 and caspase-4 to evaluate their roles in the apoptosis pathway.

Main Results:

  • TRAIL treatment led to the activation of caspase-4 in melanoma cells.
  • Caspase-4 activation was downstream of caspase-3 activation, suggesting caspase-3 mediation.
  • TRAIL induced ER stress, evidenced by GRP78 and spliced XBP-1 upregulation, which was necessary for caspase-4 activation.
  • Inhibition of caspase-4 partially blocked caspase-3 activation, indicating a positive feedback loop.

Conclusions:

  • Caspase-4 activation contributes to TRAIL-induced apoptosis in human melanoma cells.
  • TRAIL-induced ER stress is a key component in the activation of caspase-4.
  • Caspase-4 may act as a positive feedback regulator, enhancing caspase-3 activation.
  • Understanding this pathway could improve the therapeutic efficacy of TRAIL for melanoma treatment.

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