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Boronate-based fluorescent probes for imaging cellular hydrogen peroxide.

Evan W Miller1, Aaron E Albers, Arnd Pralle

  • 1Department of Chemistry, University of California, Berkeley, California 94720, USA.

Journal of the American Chemical Society
|November 25, 2005
PubMed
Summary

Researchers developed new fluorescent probes called Peroxysensors to detect hydrogen peroxide (H2O2) with high accuracy. These probes are cell-permeable and can visualize H2O2 changes in living cells, offering valuable insights into cellular processes.

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Area of Science:

  • Chemical Biology
  • Biomedical Engineering
  • Molecular Imaging

Background:

  • Hydrogen peroxide (H2O2) is a crucial reactive oxygen species (ROS) involved in cellular signaling and oxidative stress.
  • Accurate detection of H2O2 in biological systems is essential for understanding its physiological and pathological roles.

Purpose of the Study:

  • To introduce the Peroxysensor family, a novel class of fluorescent probes designed for selective H2O2 detection.
  • To evaluate the properties and biological applications of these new probes.

Main Methods:

  • Development of boronate-based fluorescent probes (Peroxyresorufin-1, Peroxyfluor-1, Peroxyxanthone-1) utilizing a deprotection mechanism.
  • Assessment of probe selectivity against various ROS in aqueous solutions.
  • Evaluation of cell permeability and H2O2 detection in living cells (hippocampal neurons) using confocal and two-photon microscopy.

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Main Results:

  • Peroxysensors exhibit high selectivity for H2O2 over other ROS.
  • The probes (PR1, PF1, PX1) provide distinct fluorescence responses (red, green, blue) upon H2O2 detection.
  • Cell-permeable probes successfully detected micromolar changes in intracellular H2O2 concentrations.

Conclusions:

  • The Peroxysensor family offers a versatile toolkit for studying cellular H2O2 dynamics.
  • These probes demonstrate significant potential for interrogating H2O2 in both normal physiology and disease states.
  • The combination of selectivity, cell permeability, and tunable fluorescence properties makes them valuable research tools.