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Related Experiment Videos

Oxidant, mitochondria and calcium: an overview.

T Chakraborti1, S Das, M Mondal

  • 1Department of Biochemistry and Biophysics, University of Kalyani, West Bengal, India.

Cellular Signalling
|February 27, 1999
PubMed
Summary

Mitochondria generate reactive oxygen species (ROS), leading to oxidative stress and cell damage. Oxidative stress triggers calcium release from mitochondria, initiating apoptosis, a process potentially regulated by bcl-2.

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Area of Science:

  • Mitochondrial biology
  • Cellular signaling
  • Apoptosis

Background:

  • Mitochondria continuously produce reactive oxygen species (ROS), contributing to oxidative stress.
  • Oxidative stress, such as during ischemia-reoxygenation injury, elevates mitochondrial superoxide production.
  • Mitochondrial dysfunction under oxidative stress can lead to cell death pathways.

Purpose of the Study:

  • To investigate the role of mitochondria in oxidative stress-induced apoptosis.
  • To explore the mechanisms of calcium release from mitochondria.
  • To understand the influence of bcl-2 on mitochondrial calcium dynamics and apoptosis.

Main Methods:

  • Review of existing literature on mitochondrial ROS production and calcium signaling.
  • Analysis of pathways involved in calcium efflux from mitochondria.

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  • Examination of the role of apoptosis-regulating genes, such as bcl-2.

    • Main Results:

    • Oxidative stress promotes mitochondrial superoxide formation, leading to ROS like hydrogen peroxide and hydroxyl radical.
    • Mitochondrial calcium release, triggered by oxidants, activates calcium-dependent enzymes, initiating apoptosis.
    • Multiple pathways exist for mitochondrial calcium efflux, including pore formation and antiport systems.

    Conclusions:

    • Mitochondrial calcium dynamics are critical in oxidant stress-induced apoptosis.
    • The proto-oncogene bcl-2 appears to suppress apoptosis by inhibiting mitochondrial calcium efflux.
    • Further research is needed to elucidate the precise mechanisms of calcium efflux and bcl-2 interactions.