Super-sectioning with multi-sheet reversible saturable optical fluorescence transitions (RESOLFT) microscopy.

Area of Science:

• Biophysics
• Cell Biology
• Microscopy

Background:

• Light-sheet fluorescence microscopy enables rapid 4D biological imaging but struggles with subcellular resolution.
• The diffraction limit of light and sheet width (>1 μm) hinder fine subcellular detail retrieval in living cells.

Purpose of the Study:

• To develop a super-resolution imaging method for rapid volumetric imaging of subcellular structures.
• To overcome the resolution limitations of conventional light-sheet microscopy for live-cell imaging.

Main Methods:

• Utilized reversibly switchable fluorescent proteins (RSFPs) and patterned illumination for photoswitching.
• Developed multi-sheet RESOLFT, creating multiple sub-diffraction limit emission sheets in parallel.
• Achieved super-sectioning ability (<100 nm) at high recording speeds (1-2 Hz).

Main Results:

• Demonstrated super-resolution imaging of subcellular structures with enhanced detail.
• Achieved rapid volumetric imaging (1-2 Hz) with super-sectioning (<100 nm).
• Showcased compatibility with various RSFPs and minimal switching cycle requirements.

Conclusions:

• Multi-sheet RESOLFT provides a powerful tool for high-resolution 4D live-cell imaging.
• The technique enables tracking of dynamic cellular processes like cell division and particle motion.
• This method significantly advances the study of subcellular dynamics in complex biological systems.