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Regulation of the intrinsic apoptosis pathway by reactive oxygen species

Chu-Chiao Wu1, Shawn B Bratton

  • 1Institute for Cellular and Molecular Biology, The University of Texas at Austin, Austin, Texas, USA.

Antioxidants & Redox Signaling
|September 18, 2012
PubMed
Abstract

Insights

The intrinsic apoptosis pathway, crucial for development and tissue health, involves BCL-2 family proteins regulating cell death. Dysregulation of apoptosis contributes to diseases like cancer and neurodegeneration.

Area of Science:

  • Cell biology
  • Molecular mechanisms of cell death

Background:

  • The BCL-2 family of proteins regulates apoptosis, primarily through mitochondrial pathways.
  • Proapoptotic members induce mitochondrial outer membrane permeabilization (MOMP), releasing cytochrome c (cyt c) to form the apoptosome.
  • Key apoptosome components include apoptotic protease-activating factor-1 and caspase-9, with proteins undergoing post-translational modifications.

Purpose of the Study:

  • To investigate the critical unresolved questions in the intrinsic apoptosis pathway.
  • To understand the regulation of MOMP, apoptosome formation, and caspase-9 activation.

Main Methods:

  • Biochemical studies on MOMP and apoptosome formation.
  • Investigation of post-translational modifications of BCL-2 family members and apoptosome components.
  • Utilizing novel animal models to study these processes in vivo.

Main Results:

  • Significant questions persist regarding cytochrome c release, apoptosome assembly, and caspase-9 activation.
  • Various post-translational modifications affect proteins involved in apoptosis.

Conclusions:

  • Further biochemical research is essential to elucidate the mechanisms of MOMP and apoptosome formation.
  • Novel animal models are required to validate the functional significance of identified post-translational modifications in apoptosis regulation.

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