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Related Experiment Videos

Two distinct pathways leading to nuclear apoptosis.

S A Susin1, E Daugas, L Ravagnan

  • 1Centre National de la Recherche Scientifique, UMR1599, Institut Gustave Roussy, F-94805 Villejuif, France.

The Journal of Experimental Medicine
|August 22, 2000
PubMed
Summary

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Apoptosis involves two pathways: one uses caspases and leads to advanced DNA fragmentation, while the other uses apoptosis-inducing factor (AIF) for large-scale DNA breakdown.

Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • Apoptosis is a crucial programmed cell death process.
  • Chromatin condensation and DNA fragmentation are key events in apoptosis.
  • The roles of apoptosis-inducing factor (AIF) and caspase-activated DNase (CAD) in these processes are complex.

Purpose of the Study:

  • To elucidate the distinct roles of AIF and CAD in apoptosis-induced chromatin alterations.
  • To investigate the interplay between caspase-dependent and caspase-independent pathways in DNA fragmentation.

Main Methods:

  • Utilized Apaf-1(-/-) and caspase-3(-/-) knockout cell lines.
  • Employed microinjection of recombinant AIF, activated caspase-3, and CAD.
  • Performed experiments with purified HeLa nuclei and cell-free extracts.

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Main Results:

  • AIF induces peripheral chromatin condensation (stage I) and large-scale DNA fragmentation.
  • Caspase-3 and CAD induce advanced chromatin condensation (stage II) and oligonucleosomal DNA degradation.
  • Two redundant pathways for chromatin processing in apoptosis were identified: a caspase-dependent pathway involving CAD and a caspase-independent pathway involving AIF.

Conclusions:

  • Apoptosis involves at least two parallel pathways for chromatin processing.
  • The caspase-dependent pathway leads to oligonucleosomal DNA fragmentation and advanced chromatin condensation.
  • The caspase-independent pathway involving AIF results in large-scale DNA fragmentation and peripheral chromatin condensation.