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Related Experiment Videos

Mitochondria-dependent apoptosis and cellular pH regulation.

S Matsuyama1, J C Reed

  • 1The Burnham Institute, 10901 N. Torrey Pines Rd, La Jolla, CA 92037, USA.

Cell Death and Differentiation
|February 15, 2001
PubMed
Summary

Mitochondria release proteins during apoptosis, but cell death commitment often precedes caspase activation. Dysregulation of cellular pH is implicated in mitochondria-mediated cell death pathways.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Molecular Biology

Background:

  • Mitochondria are central to apoptosis, releasing factors like cytochrome c to activate caspases.
  • Mechanisms of protein release from mitochondria and the cell death commitment point remain unclear.
  • Caspase inhibition often fails to prevent cell death, suggesting commitment occurs upstream.

Purpose of the Study:

  • To review evidence linking cellular pH dysregulation to mitochondria-mediated cell death.
  • To explore the role of mitochondrial dysfunction versus protein release in cell death commitment.

Main Methods:

  • Literature review of studies on apoptosis, mitochondria, and cellular pH.
  • Analysis of mechanisms of mitochondrial outer membrane permeabilization.

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  • Examination of the role of pH in mitochondrial permeability transition.

    • Main Results:

    • Mitochondrial damage and protein release are key events in apoptosis.
    • Cell death commitment can occur upstream of caspase activation.
    • Evidence suggests cellular pH dysregulation is a critical component of mitochondria-dependent cell death.

    Conclusions:

    • Mitochondria-dependent cell death involves complex pathways beyond simple caspase activation.
    • Cellular pH dysregulation is a significant factor in the commitment to cell death.
    • Further research is needed to fully elucidate the role of pH in mitochondrial cell death.