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Mitochondrial regulation of cell death: processing of apoptosis-inducing factor (AIF)

Erik Norberg1, Sten Orrenius, Boris Zhivotovsky

  • 1Institute of Environmental Medicine, Division of Toxicology Karolinska Institutet, SE-17177 Stockholm, Sweden.

Biochemical and Biophysical Research Communications
|May 25, 2010
PubMed

Insights

Apoptosis-inducing factor (AIF) is a key protein in caspase-independent cell death. This review details how AIF is released from its mitochondrial membrane anchor to induce cell death.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Molecular Biology

Background:

  • Apoptosis, or programmed cell death, can occur via caspase-dependent or -independent pathways.
  • Apoptosis-inducing factor (AIF) was initially identified as a soluble factor mediating caspase-independent cell death.
  • AIF's role in nuclear events like DNA fragmentation and chromatin condensation is well-established.

Purpose of the Study:

  • To review the current understanding of molecular mechanisms governing AIF processing and release from mitochondria.
  • To discuss the regulation of AIF's transition from its mitochondrial membrane anchor to the cytosol.
  • To provide a comprehensive overview of AIF's role in caspase-independent apoptosis.

Main Methods:

  • Literature review of studies on AIF processing and release.
  • Analysis of molecular mechanisms involved in mitochondrial outer and inner membrane permeabilization.
  • Integration of findings on AIF's interaction with mitochondrial components.

Main Results:

  • AIF is N-terminally anchored to the inner mitochondrial membrane, not freely soluble in the intermembrane space.
  • AIF release requires liberation from its membrane anchor before translocation to the cytosol.
  • Specific molecular players and pathways regulating AIF processing and release are being elucidated.

Conclusions:

  • Understanding AIF's release mechanism is crucial for comprehending caspase-independent apoptosis.
  • AIF's mitochondrial localization and release are tightly regulated processes.
  • Further research into AIF regulation may reveal new therapeutic targets for diseases involving aberrant cell death.

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