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Related Experiment Videos

Analysis of membrane protein cluster densities and sizes in situ by image correlation spectroscopy.

N O Petersen1, C Brown, A Kaminski

  • 1Department of Chemistry, University of Western Ontario, London, Canada.

Faraday Discussions
|May 24, 2000
PubMed
Summary

Image correlation spectroscopy (ICS) quantifies cell surface receptor aggregation dynamics. This method uses fluorescence microscopy and image analysis to measure receptor density, movement, and interactions in living cells.

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Area of Science:

  • Cell biology
  • Biophysics
  • Microscopy

Background:

  • Cell surface receptors mediate intercellular communication by binding signaling molecules.
  • Receptor aggregation and internalization via coated pits are crucial for signal transduction and regulation.
  • Dynamic measurement of receptor aggregation in living cells is essential for understanding cellular processes.

Purpose of the Study:

  • To introduce and validate image correlation spectroscopy (ICS) for quantitative analysis of cell surface receptor dynamics.
  • To demonstrate the application of ICS in measuring receptor density, coated pit formation, and viral fusion.
  • To extend ICS to image cross-correlation spectroscopy (ICCS) for analyzing receptor movement, co-localization, and interactions over time.

Main Methods:

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  • Utilizing laser confocal fluorescence microscopy to obtain high-resolution images of fluorescently labeled cell surface receptors.
  • Applying autocorrelation functions to quantitatively analyze image intensity and determine particle density and aggregation.
  • Employing cross-correlation functions between image pairs to measure temporal dynamics, movement, and co-localization of different receptors.

    • Main Results:

    • ICS accurately measures the density of various cell surface receptors and coated pits.
    • The technique quantifies the number of molecules per coated pit and monitors virus-cell membrane fusion.
    • ICCS enables dynamic measurements of receptor aggregate movement and the extent of interaction between different receptor types.

    Conclusions:

    • ICS and ICCS provide powerful, quantitative tools for studying cell surface receptor dynamics in living cells.
    • These methods offer precise measurements of receptor aggregation, movement, and co-localization, independent of microscope spatial resolution.
    • The techniques have broad applications in cell signaling, membrane trafficking, and virology research.