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Determination of Mitochondrial Membrane Potential and Reactive Oxygen Species in Live Rat Cortical Neurons
09:56

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Published on: May 23, 2011

Quantitative proteomics reveals oxygen-dependent changes in neuronal mitochondria affecting function and sensitivity

Lance Villeneuve1, Leann M Tiede, Brenda Morsey

  • 1Department of Pharmacology and Experimental Neuroscience, University of Nebraska Medical Center , 985800 Nebraska Medical Center, Omaha, Nebraska 68198, United States.

Journal of Proteome Research
|August 27, 2013
PubMed
Summary

Mitochondria function differs at physiological oxygen levels. Culturing cells at 5% oxygen reduces reactive oxygen species (ROS) and increases sensitivity to Parkinson

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Area of Science:

  • Cell Biology
  • Neuroscience
  • Mitochondrial Biology

Background:

  • Mitochondria are crucial in aging and degenerative diseases.
  • Tissue culture typically uses atmospheric oxygen (21%), not physiological levels (1-11%).
  • Oxygen levels impact mitochondrial function and cellular responses.

Purpose of the Study:

  • To investigate the impact of oxygen levels on mitochondrial function in neuronal cells.
  • To compare mitochondrial responses under atmospheric versus physiological oxygen conditions.
  • To assess the influence of oxygen on reactive oxygen species (ROS) production and toxin sensitivity.

Main Methods:

  • Utilized SH-SY5Y neuroblastoma cells and primary human neurons.
  • Employed mitochondrial probe imaging, mass spectrometry, Western blots, and ATP assays.
  • Compared cells cultured at atmospheric (21%) and physiological (5%) oxygen levels.

Main Results:

  • Cells cultured at 5% oxygen showed significantly lower ROS production.
  • Mass spectrometry revealed extensive mitochondrial proteomic changes at 5% oxygen.
  • Cells at 5% oxygen exhibited increased sensitivity to rotenone, a Parkinson's-linked toxin.

Conclusions:

  • Neuronal mitochondria are highly responsive to ambient oxygen levels.
  • Physiological oxygen levels (5%) appear beneficial for reducing ROS in neuronal cultures.
  • Oxygen-dependent mitochondrial changes may influence neurodegenerative disease susceptibility.