Long-term intravital subcellular imaging with confocal scanning light-field microscopy

Area of Science:

• Biophysics
• Microscopy
• Cell Biology

Background:

• Long-term subcellular dynamics observation is hindered by background fluorescence and tissue scattering.
• Current confocal microscopy methods involve trade-offs between parallelization, resolution, and phototoxicity.

Purpose of the Study:

• To introduce confocal scanning light-field microscopy (csLFM) for high-fidelity, high-speed 3D imaging.
• To overcome limitations of existing microscopy techniques in observing subcellular dynamics.

Main Methods:

• Integration of axially elongated line-confocal illumination with rolling shutter in scanning light-field microscopy (sLFM).
• Simultaneous 3D excitation and detection enabling reduced excitation intensity (<1 mW mm⁻²).

Main Results:

• Achieved near-diffraction-limit resolution, optical sectioning, and low phototoxicity.
• Demonstrated a 15-fold higher signal-to-background ratio compared to sLFM.
• Successfully imaged subcellular dynamics over 25,000 timeframes in diverse species and challenging environments.

Conclusions:

• csLFM enables high-fidelity, high-speed 3D imaging of subcellular dynamics with reduced phototoxicity.
• The technique facilitates high-quality, large-scale neural recording with reduced crosstalk, aiding neural coding research.