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ERK1/2 activation attenuates TRAIL-induced apoptosis through the regulation of mitochondria-dependent pathway

Do Yeon Lee1, Myoung Woo Lee, Hyun Jung Lee

  • 1Department of Anatomy and Cell Biology, College of Medicine, Chung-Ang University, 221 Huksuk-dong, Dongjak-ku, Seoul 156-756, Republic of Korea.

Toxicology in Vitro : an International Journal Published in Association with BIBRA
|March 28, 2006
PubMed

Insights

Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) triggers apoptosis. Extracellular signal-regulated kinase 1/2 (ERK1/2) activation acts as a survival mechanism, upregulating Bcl-2 to protect cells from TRAIL-induced death.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) induces programmed cell death (apoptosis) in cancer cells.
  • Understanding the molecular pathways of TRAIL-induced apoptosis is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To investigate the role of extracellular signal-regulated kinase 1/2 (ERK1/2) in TRAIL-mediated apoptosis.
  • To identify downstream targets of ERK1/2 involved in TRAIL signaling.

Main Methods:

  • HeLa cells were treated with TRAIL.
  • ERK1/2 activation and downstream targets were analyzed.
  • Mitochondrial integrity and caspase activity were assessed following ERK1/2 inhibition using PD98059.

Main Results:

  • TRAIL exposure activated ERK1/2 and increased anti-apoptotic Bcl-2 protein levels.
  • Inhibiting ERK1/2 with PD98059 led to increased cell death.
  • ERK1/2 inhibition caused mitochondrial damage, cytochrome c release, and enhanced caspase activity.

Conclusions:

  • ERK1/2 activation serves as an early-stage survival mechanism against TRAIL-induced stress.
  • This survival pathway involves upregulating the Bcl-2/Bax ratio and modulating mitochondrial events.
  • Targeting ERK1/2 could potentially enhance TRAIL-based cancer treatments.

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