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Are Hydroethidine-Based Probes Reliable for Reactive Oxygen Species Detection?

Yi Xiao1,2, David Meierhofer1

  • 11 Max Planck Institute for Molecular Genetics, Berlin, Germany.

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|May 24, 2018
PubMed
Summary

A new mass spectrometry method for superoxide detection has limitations. Hydroethidine probes show autoxidation, questioning their reliability for quantifying superoxide radicals in cell cultures.

Keywords:
hydroethidine (HE)hydropropidine (HPr)mass spectrometrymito-hydroethidine (mitoSOX red or mito-HE)reactive oxygen species (ROS)superoxide (O)

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Area of Science:

  • Biochemistry
  • Analytical Chemistry
  • Cell Biology

Background:

  • Superoxide (O•2-) detection is crucial but challenging due to its reactivity.
  • Existing methods for reactive oxygen species (ROS) detection have limitations in specificity and quantification.

Purpose of the Study:

  • To develop and validate a mass spectrometry-based method for detecting and quantifying superoxide.
  • To assess the utility of hydroethidine (HE) probes for measuring superoxide in different cellular compartments.

Main Methods:

  • Utilized liquid chromatography-tandem mass spectrometry (LC-MS/MS) with multiple reaction monitoring (MRM).
  • Employed three fluorogenic hydroethidine probes (HE, mito-HE, HPr+) for cytosolic, mitochondrial, and extracellular superoxide detection.
  • Simultaneously quantified probes and oxidation products for specific ROS distribution analysis.

Main Results:

  • The LC-MS/MS method enabled precise distinction of coeluting compounds, overcoming spectral overlap issues.
  • Hydroethidine probes demonstrated susceptibility to autoxidation at 37°C in Hank's solution.
  • Cell treatments with strong oxidants did not significantly alter measured superoxide levels, indicating potential quantification issues.

Conclusions:

  • While the MS-based method offers specificity, the autoxidation of HE probes raises concerns about their reliability for subtle superoxide quantification in cell cultures.
  • Further validation is needed to confirm the suitability of HE-based probes for accurate ROS measurements in biological systems.