LSPR-mediated high axial-resolution fluorescence imaging on a silver nanoparticle sheet

Area of Science:

• Biophysics
• Nanotechnology
• Cell Biology

Background:

• Visualizing cell-attached nanointerfaces is crucial for understanding cellular processes.
• Existing high-resolution microscopy techniques can be complex and require specialized equipment.

Purpose of the Study:

• To develop an original technique for visualizing cell-attached nanointerfaces with extremely high axial resolution.
• To evaluate the usability and effectiveness of this new method compared to traditional techniques.
• To assess the cytotoxicity of silver nanoparticles used in the technique.

Main Methods:

• Utilizing homogeneously excited localized surface plasmon resonance (LSPR) on self-assembled silver nanoparticle sheets.
• Confining and enhancing fluorescence at the nanointerface using the LSPR sheet.
• Employing epifluorescence microscopy for imaging.
• Conducting morphological analysis of adherent cells to determine cytotoxicity.

Main Results:

• Achieved extremely high axial resolution visualization of cell-attached nanointerfaces.
• Generated high signal-to-noise ratio images of focal adhesion at the cell-attached interface.
• Demonstrated comparable or superior image quality to TIRF microscopy using a simpler epifluorescence setup.
• Reported cytotoxicity data for silver nanoparticles based on cell morphology.

Conclusions:

• The LSPR-assisted technique provides a user-friendly and effective method for high-resolution nanointerface imaging.
• This approach offers a valuable alternative to complex microscopy techniques for studying cell-material interactions.
• The study also provides essential safety information regarding the use of silver nanoparticles in biological applications.