High-resolution imaging of a cell-attached nanointerface using a gold-nanoparticle two-dimensional sheet

Area of Science:

• Biophysics
• Nanotechnology
• Cell Biology

Background:

• Visualizing cell-attached nanointerfaces is crucial for understanding cellular dynamics.
• Existing methods like TIRF microscopy have limitations in resolution and application scope.
• The need for high-resolution, non-scanning imaging techniques for rapid interfacial phenomena is evident.

Purpose of the Study:

• To develop a simple, effective, non-scanning method for visualizing cell-attached nanointerfaces.
• To leverage localized surface plasmon resonance (LSPR) for enhanced imaging.
• To demonstrate the method's capability in capturing high-resolution cellular dynamics.

Main Methods:

• Utilized a two-dimensional self-assembled gold-nanoparticle sheet to excite localized surface plasmon resonance (LSPR).
• Employed homogeneous LSPR excitation for high-contrast interfacial imaging.
• Conducted experiments on rat basophilic leukemia (RBL-2H3) cells with fluorescence-labeled actin filaments.

Main Results:

• Achieved high-contrast interfacial images due to light confinement and fluorescence enhancement by LSPR.
• Demonstrated high axial and lateral resolution using a standard epifluorescence microscope.
• Obtained superior image quality compared to total internal reflection fluorescence (TIRF) microscopy.

Conclusions:

• The proposed non-scanning LSPR method provides a simple and effective way to visualize cell-attached nanointerfaces.
• This technique offers high-resolution imaging capabilities for monitoring rapid cellular and molecular dynamics.
• The method presents a valuable tool for studying interfacial phenomena in various biological systems.