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Apoptosis-inducing factor and apoptosis.

Cui-Xian Lü1, Ting-Jun Fan, Guo-Bin Hu

  • 1Department Marine of Biology, College of Life Sciences and Technology, Ocean University of China, Qingdao 266003, China.

Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao Acta Biochimica Et Biophysica Sinica
|September 30, 2003
PubMed
Summary
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Apoptosis-inducing factor (AIF) triggers programmed cell death through DNA fragmentation independently of caspases. This mitochondrial protein

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Apoptosis-inducing factor (AIF) is a mitochondrial protein.
  • AIF induces apoptosis via a caspase-independent pathway.
  • Homologous proteins AMID and PRG3 also exhibit apoptosis-inducing effects.

Purpose of the Study:

  • To elucidate the role of AIF in apoptosis.
  • To investigate AIF-mediated DNA degradation mechanisms.
  • To explore cross-regulation between apoptotic pathways.

Main Methods:

  • Investigated AIF's function in programmed cell death.
  • Studied AIF-mediated DNA fragmentation (approx. 50 kb).
  • Examined AIF homologs (AMID, PRG3) and C. elegans AIF (WAH-1).

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Main Results:

  • AIF induces nuclear chromatin condensation and large-scale DNA fragmentation.
  • AIF is crucial for programmed cell death during embryoid body cavitation.
  • WAH-1-induced apoptosis in C. elegans is CED-3-dependent.
  • AIF interacts with cytochrome c and caspases in mammalian apoptosis.

Conclusions:

  • AIF is a key mediator of caspase-independent apoptosis.
  • AIF's role in DNA fragmentation is essential for programmed cell death.
  • Apoptotic pathways exhibit cross-regulation, involving AIF, cytochrome c, and caspases.