Multimodal illumination platform for 3D single-molecule super-resolution imaging throughout mammalian cells

Area of Science:

• Cellular and Molecular Imaging
• Biophysics
• Optical Microscopy

Background:

• Single-molecule super-resolution imaging requires high signal-to-background ratio (SBR) for precise 3D localization in thick mammalian cells.
• Optimizing SBR is crucial for nanoscale investigations of cellular architecture and organization.
• Existing methods often lack flexibility in illumination schemes for target-specific SBR optimization.

Approach:

• Developed a versatile multimodal illumination platform integrating light sheet, epi-, and total internal reflection fluorescence (TIRF) illumination.
• Utilized primarily commercially available components for accessibility and ease of use.
• Combined illumination modalities with point spread function engineering for enhanced 3D imaging capabilities.

Key Points:

• Flat-field TIRF illumination provides excellent sectioning and low background for targets near the coverslip, improving data quality and localization precision.
• Light sheet (LS) illumination offers increased contrast compared to epi-illumination, ideal for imaging structures throughout the cell.
• Demonstrated improved 3D super-resolution imaging through two-color imaging of paxillin and actin in human osteosarcoma cells.

Conclusions:

• The multimodal platform enables fast, convenient switching between illumination schemes for optimized SBR in 3D single-molecule super-resolution microscopy.
• This versatile system facilitates precise nanoscale studies of diverse cellular structures within mammalian cells.
• The developed platform enhances the capabilities of super-resolution microscopy for biological research.