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A Label-free Technique for the Spatio-temporal Imaging of Single Cell Secretions
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pH sensing in living cells using fluorescent microspheres.

Mark Bradley1, Lois Alexander, Karen Duncan

  • 1Chemical Biology Section, School of Chemistry, University of Edinburgh, Joseph Black Building, West Mains Road, EH9 3JJ Edinburgh, United Kingdom.

Bioorganic & Medicinal Chemistry Letters
|November 9, 2007
PubMed
Summary

Researchers developed stable fluorescent microsphere sensors for real-time, single-cell intracellular pH measurement. This method overcomes limitations of previous techniques, enabling long-term pH flux analysis in living cells.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Analytical Chemistry

Background:

  • Intracellular pH (pH(i)) is a critical parameter for cellular function.
  • Accurate real-time measurement of pH(i) at the single-cell level remains challenging.
  • Existing methods suffer from issues like dilution, leakage, and compartmentalization.

Purpose of the Study:

  • To develop a novel method for real-time, single-cell intracellular pH measurement.
  • To utilize fluorescently covalently loaded microspheres as stable sensors.
  • To enable long-term monitoring of intracellular pH flux.

Main Methods:

  • Development of fluorescently covalently loaded microspheres.
  • Immobilization of sensors onto polymeric particles.
  • Real-time monitoring of intracellular pH at the single-cell level.

Main Results:

  • Microspheres demonstrated efficient carrier system capabilities.
  • Covalently immobilized sensors provided stable pH measurements.
  • The method allowed for analysis of intracellular pH flux over extended periods.
  • Overcame limitations of dilution, leakage, and compartmentalization.

Conclusions:

  • Fluorescently covalently loaded microspheres are effective for real-time, single-cell intracellular pH monitoring.
  • This technique offers a stable and reliable approach for long-term pH flux analysis.
  • The developed sensors overcome significant limitations of prior pH measurement methods.