Total internal reflection fluorescence microscopy of cell adhesion on patterned self-assembled monolayers on gold

Area of Science:

• Biophysics
• Surface Science
• Cell Biology

Background:

• Cell adhesion is crucial for biological processes.
• Studying cell adhesion on patterned surfaces requires advanced microscopy techniques.
• Self-assembled monolayers (SAMs) offer versatile platforms for surface patterning.

Purpose of the Study:

• To investigate cell adhesion on micro- and nanoscale patterned surfaces.
• To demonstrate the utility of Total Internal Reflection Fluorescence Microscopy (TIRFM) for such studies.
• To develop a method for creating and analyzing patterned surfaces for cell adhesion research.

Main Methods:

• Fabrication of patterned surfaces using microcontact printing and dip-pen nanolithography.
• Adsorption of fibronectin onto hydrophobic features.
• Electrochemical oxidation and chemoselective immobilization of Arg-Gly-Asp (RGD) peptides.
• Utilizing prism-based TIRFM for high-resolution imaging of adhered cells.
• Post-imaging visualization with conventional fluorescence microscopy.

Main Results:

• Successful patterning of surfaces with both microscale and nanoscale features.
• Demonstrated visualization of cell adhesion on these patterned surfaces using TIRFM.
• Confirmed the ability to immobilize bioactive peptides (RGD) on nanoarrays.
• Showcased the compatibility of TIRFM with subsequent conventional fluorescence microscopy.

Conclusions:

• TIRFM is a powerful tool for studying cell adhesion on complex patterned surfaces.
• The developed methods allow for precise control and analysis of cell-surface interactions at multiple scales.
• This approach provides a foundation for designing advanced biomaterials and understanding cell behavior.