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Time-resolved fluorescence microscopy.

Klaus Suhling¹, Paul M W French, David Phillips

¹Department of Physics, King's College London, Strand, London, UK. klaus.suhling@kcl.ac.uk

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology

|December 24, 2004

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Fluorescence lifetime imaging (FLIM) offers advanced insights beyond intensity, measuring photophysical events and molecular mobility. Different FLIM techniques provide trade-offs between speed and accuracy for biological imaging.

Area of Science:

Optics and Photonics
Biophysical Techniques
Molecular Imaging

Background:

Fluorescence microscopy traditionally relies on intensity and position.
Advanced fluorescence properties like lifetime and polarization offer deeper insights.
Fluorescence lifetime imaging (FLIM) and time-resolved fluorescence anisotropy imaging (TR-FAIM) capture dynamic photophysical and molecular rotation information.

Purpose of the Study:

To compare different Fluorescence Lifetime Imaging Microscopy (FLIM) methodologies.
To highlight the capabilities of FLIM and TR-FAIM in biological research.
To showcase FLIM's ability to probe molecular interactions and local environments.

Main Methods:

Comparison of FLIM techniques including wide-field time-gating, phase modulation, and time-correlated single photon counting (TCSPC).

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TR-FAIM for measuring fluorophore rotational mobility.

Application of FLIM for detecting Förster Resonance Energy Transfer (FRET) to study protein interactions and phosphorylation.

Main Results:

Wide-field time-gating and phase modulation methods offer rapid acquisition speeds.
TCSPC-based confocal scanning provides high accuracy in fluorescence decay measurements.
FLIM successfully images protein-protein interactions (e.g., receptor oligomerization) and environmental parameters (pH, ion concentration).

Conclusions:

FLIM provides unique information on photophysical events and molecular environments not accessible by intensity imaging alone.
The choice of FLIM method depends on the balance required between acquisition speed and decay accuracy.
FLIM is a versatile tool for investigating molecular dynamics, interactions, and local cellular conditions.