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Related Experiment Videos

Intracellular fluorescent probe concentrations by confocal microscopy

C Fink1, F Morgan, L M Loew

  • 1Department of Physiology and Center for Biomedical Imaging Technology, University of Connecticut Health Center, Farmington, Connecticut 06030 USA.

Biophysical Journal
|September 24, 1998
PubMed
Summary
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This study presents a novel confocal microscopy method for measuring fluorescent molecule concentrations within cells. The technique corrects for optical dilution in small cellular compartments, enabling accurate quantification of intracellular molecules.

Area of Science:

  • Cell biology
  • Microscopy techniques
  • Biophysics

Background:

  • Confocal microscopy offers optical sectioning capabilities.
  • Quantifying intracellular fluorescent molecule concentrations is crucial for understanding cellular processes.
  • Accurate measurements in small cellular compartments are challenging due to optical dilution.

Purpose of the Study:

  • To develop a general method for measuring absolute and relative concentrations of fluorescent molecules inside cells using confocal microscopy.
  • To address the challenge of optical dilution in small cellular compartments.
  • To provide a versatile tool for quantitative cell biology.

Main Methods:

  • Utilizing the optical sectioning property of confocal microscopy.
  • Developing correction methods for fluorescence intensity dilution in small compartments.

Related Experiment Videos

  • Employing computationally synthesized, blurred cell models for calibration.
  • Applying the method to measure calcium indicators, InsP3 receptors, bradykinin receptors, and potentiometric dyes.

    • Main Results:

    • Demonstrated accurate measurement of absolute and relative fluorescent molecule concentrations.
    • Successfully corrected for optical dilution effects in small cellular compartments.
    • Validated the method across diverse biological applications including receptor distribution and membrane potential assays.

    Conclusions:

    • The described confocal microscopy method provides a robust approach for quantitative analysis of intracellular fluorescent molecules.
    • This technique enhances the precision of measurements in challenging cellular environments.
    • The method has broad applicability in cell biology research, aiding in the study of molecular localization and cellular function.