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Related Experiment Videos

Intraphagosomal oxygen in stimulated macrophages

P E James1, O Y Grinberg, G Michaels

  • 1Department of Radiology, Dartmouth Medical School, Hanover, New Hampshire 03755, USA.

Journal of Cellular Physiology
|May 1, 1995
PubMed
Summary
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Researchers developed a new electron paramagnetic resonance (EPR) method to measure oxygen (pO2) within phagosomes. This technique avoids broadening agents, offering precise intracellular oxygen measurements and revealing a significant oxygen gradient between phagosomes and extracellular space.

Area of Science:

  • Biophysics
  • Cell Biology
  • Biochemistry

Background:

  • Intracellular oxygen levels (pO2) are crucial for cellular functions.
  • Previous methods for measuring intracellular pO2 have limitations, including potential experimental errors.
  • Understanding oxygen gradients within cells is essential for interpreting cellular processes.

Purpose of the Study:

  • To develop a novel electron paramagnetic resonance (EPR)-based method for selective intracellular oxygen measurements.
  • To quantify the oxygen concentration within phagosomes of macrophages.
  • To compare intraphagosomal pO2 with extracellular pO2 and investigate factors influencing this gradient.

Main Methods:

  • Developed a new EPR oximetry technique using a positively charged oxygen-sensitive probe (d-Cat1) for selective phagosomal localization.

Related Experiment Videos

  • Utilized a neutral nitroxide probe (15N PDT) to measure extracellular oxygen in the same sample.
  • Analyzed EPR linewidths to determine intraphagosomal and extracellular oxygen concentrations.

    • Main Results:

    • The developed EPR method successfully measured intraphagosomal oxygen without a broadening agent.
    • Average intraphagosomal oxygen concentration was found to be significantly lower (11.2 +/- 3.4 microM) than extracellular levels under air perfusion.
    • This oxygen gradient increased with stimulated mitochondrial consumption or elevated extracellular oxygen levels.

    Conclusions:

    • This study presents the first reported measurements of oxygen concentration within a specific intracellular compartment (phagosomes).
    • A significant oxygen gradient exists between intraphagosomal and extracellular environments.
    • The observed gradient suggests mechanisms beyond simple diffusion influence intracellular oxygen distribution.