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Optical methods for imaging ionic activities

R B Moreton1

  • 1Babraham Institute, Department of Zoology, Cambridge, UK.

Scanning Microscopy. Supplement
|January 1, 1994
PubMed
Summary

Fluorescent dyes enable dynamic imaging of ion activity in living cells. This optical fluorescence microscopy technique offers high temporal resolution and sensitive detection for various ions, crucial for understanding cell signaling.

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Area of Science:

  • Cell Biology
  • Biophysics
  • Analytical Chemistry

Background:

  • Optical fluorescence properties reveal molecular environments.
  • Dyes can be engineered for specific ion binding, altering fluorescence.
  • Fluorescence microscopy visualizes ionic activities in living cells.

Purpose of the Study:

  • To detail a method for dynamic imaging of ionic activities in living cells using fluorescence microscopy.
  • To explain how altered fluorescence spectra enable quantitative ion measurements.
  • To highlight the application of this technique for studying cellular processes.

Main Methods:

  • Utilizing fluorescent indicators that change fluorescence upon reversible ion binding.
  • Employing ratio imaging of fluorescence spectra at two wavelengths to quantify ion concentrations.
  • Implementing sensitive video cameras and computer processing for digitized image analysis.
  • Developing methods analogous to continuum normalization in X-ray microanalysis.

Main Results:

  • Demonstrated quantitative measurements of ion concentrations by analyzing fluorescence spectral ratios.
  • Achieved high temporal resolution (as low as 200 msec) for dynamic cellular processes.
  • Showcased fluorescent indicators for various ions including calcium, magnesium, hydrogen, sodium, zinc, and chloride.
  • Reported detection limits lower than X-ray methods with high-affinity dyes.

Conclusions:

  • Fluorescence microscopy provides a powerful tool for dynamic ion imaging in living cells.
  • The ratio imaging method overcomes variations in dye concentration and optical path-length.
  • This technique has broad applications in plant and animal cell research, particularly for calcium signaling.

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