Cell micropatterning on an albumin-based substrate using an inkjet printing technique

Area of Science:

• Biotechnology
• Materials Science
• Cell Biology

Background:

• Precise cell positioning is crucial for cell-based technologies like tissue engineering and biosensors.
• Inkjet printing offers a promising method for fabricating cellular patterns, but challenges remain with printing living cells or proteins.

Purpose of the Study:

• To develop a robust and reproducible inkjet printing method for creating complex cellular patterns.
• To utilize a novel albumin-based substrate and cationic polymer for controlled cell adhesion.

Main Methods:

• Cross-linking albumin with ethylene glycol diglycidyl ether to create a non-adhesive substrate.
• Modifying the albumin surface by inkjet printing polyethyleneimine (PEI) solutions to create cell-adhesive regions.
• Seeding various cell types onto the patterned substrates to create complex cellular arrangements.

Main Results:

• Successfully created complex cellular patterns, including figures, letters, and gradients, using the developed method.
• Demonstrated the versatility of the technique with mouse L929 fibroblast and Neuro-2a neuroblastoma cells.
• Showcased the advantage of printing stable PEI over fragile cells or proteins, preventing nozzle clogging and ensuring reproducibility.

Conclusions:

• The developed inkjet printing method using a cross-linked albumin substrate and PEI patterning enables the creation of complex and reproducible cellular patterns.
• This technique offers a significant advancement for cell-based technologies, overcoming limitations of previous methods.
• The method holds potential for applications in fundamental cell research, tissue engineering, and biosensor fabrication.