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Role of elevated pressure in TRAIL-induced apoptosis in human lung carcinoma cells

Sangnam Oh1, Daeho Kwon, Hyun Jeong Lee

  • 1Cellular and Developmental Biology, Division of Biomedical Science, Seoul, Korea.

Apoptosis : an International Journal on Programmed Cell Death
|July 13, 2010
PubMed

Insights

Elevated pressure (EP) enhances cancer cell sensitivity to TRAIL-induced apoptosis. This combination therapy shows promise for treating lung carcinoma with minimal impact on normal cells.

Area of Science:

  • Oncology
  • Biophysics
  • Cell Biology

Background:

  • TNF-related apoptosis-inducing ligand (TRAIL) is a targeted anticancer agent.
  • Enhancing TRAIL sensitivity in cancer cells is crucial for effective therapy.
  • Mechanical stress as an apoptosis inducer for cancer cells remains underexplored.

Purpose of the Study:

  • To investigate the synergistic effect of elevated pressure (EP) and TRAIL on cancer cell apoptosis.
  • To explore the underlying mechanisms of EP-mediated sensitization to TRAIL.
  • To evaluate the efficacy and safety of combined TRAIL and EP treatment in vitro and in vivo.

Main Methods:

  • Development of a custom culture system to apply elevated pressure (2 atmospheres).
  • Treatment of human H460 lung cancer cells and normal human cells with TRAIL and EP.
  • Analysis of apoptosis markers including death receptor 5 (DR5) expression, caspase activation, mitochondrial membrane potential, and reactive oxygen species (ROS) production.
  • In vivo studies using a chicken chorioallantoic membrane (CAM) model.

Main Results:

  • Combined TRAIL and EP significantly increased apoptosis in H460 lung cancer cells compared to TRAIL or EP alone.
  • EP treatment upregulated DR5, activated caspases, decreased mitochondrial membrane potential, and increased ROS production in cancer cells.
  • Normal human cells showed no significant DNA damage or cell death upon combined treatment.
  • In vivo studies demonstrated enhanced TRAIL-mediated apoptosis of H460 tumors in the CAM model.

Conclusions:

  • Elevated pressure (EP) acts as a sensitizing agent, enhancing TRAIL-induced apoptosis in human lung carcinoma cells.
  • The combination therapy is specific to cancer cells, sparing normal cells from damage.
  • EP represents a novel mechanical stimulus with potential applications in enhancing cancer therapy.

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