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Related Experiment Video

Updated: Jan 17, 2026

In Vivo EPR Assessment of pH, pO2, Redox Status, and Concentrations of Phosphate and Glutathione in the Tumor Microenvironment
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Noninvasive in vivo discrimination between mitochondrial ROS and global ROS production in solid tumors using EPR

Barbara Mathieu1, Justin D Rondeau2, Lionel Mignion3

  • 1Biomedical Magnetic Resonance, Louvain Drug Research Institute (LDRI), Université Catholique de Louvain (UCLouvain), 1200, Brussels, Belgium; Pole of Pharmacology and Therapeutics, Institut de Recherches Expérimentales et Cliniques (IREC), Université Catholique de Louvain (UCLouvain), 1200, Brussels, Belgium.

Redox Biology
|September 18, 2025
PubMed
Summary

This study introduces a novel Electron Paramagnetic Resonance (EPR) method using dual nitroxide sensors to pinpoint reactive oxygen species (ROS) production sites in mitochondria versus intracellular/extracellular areas, crucial for understanding cellular redox signaling.

Keywords:
3-Carbamoyl-proxylCancerEPRESRMitochondriaNitroxideROSmitoTEMPO

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Area of Science:

  • Biomedical Engineering
  • Biophysics
  • Cellular Biology

Background:

  • Precise localization of reactive oxygen species (ROS) production is vital for understanding cellular redox signaling and its physiological impact.
  • Existing methods lack the specificity to differentiate ROS generation sites within complex biological systems, particularly in vivo.
  • Developing tools for site-specific ROS detection is crucial for advancing research in cellular physiology and pathology.

Purpose of the Study:

  • To develop and validate a novel non-invasive protocol for discriminating the site of ROS production in vivo.
  • To utilize Electron Paramagnetic Resonance (EPR) spectroscopy with dual nitroxide sensors (mitoTEMPO and carbamoyl-proxyl) for compartmentalized ROS detection.
  • To assess the utility of this method in a 4T1 breast tumor model under conditions modulating mitochondrial and cytosolic ROS levels.

Main Methods:

  • Employing Electron Paramagnetic Resonance (EPR) spectroscopy at 9 GHz (in vitro) and 1 GHz (in vivo) using mitoTEMPO and carbamoyl-proxyl (3CP) nitroxide sensors.
  • Utilizing l-Buthionine Sulfoximine (L-BSO) to inhibit glutathione synthesis and Antimycin A to inhibit mitochondrial complex III to modulate ROS levels.
  • Analyzing nitroxide decay rates in 4T1 breast tumor cells and mouse models, complemented by ex-vivo tumor analyses and experiments with SOD2-overexpressing cells.

Main Results:

  • Differential decay rates of mitoTEMPO and 3CP were observed in vivo following L-BSO and Antimycin A treatments, correlating with altered ROS production sites.
  • In vivo results in mice mirrored in vitro findings in cells, validating the compartmentalized ROS detection approach.
  • Ex-vivo analyses confirmed that blood washout did not significantly affect nitroxide signal decay, and experiments with SOD2-overexpressing cells helped assess superoxide's contribution.

Conclusions:

  • The study successfully established a new EPR-based protocol for non-invasively distinguishing between mitochondrial and intracellular/extracellular ROS production sites in vivo.
  • This method provides a valuable tool for researchers studying redox signaling, cellular metabolism, and disease pathogenesis.
  • The findings pave the way for more precise investigations into the role of localized ROS in various physiological and pathological processes.