Plasma stencilling methods for cell patterning.

Area of Science:

• Biotechnology
• Materials Science
• Cell Biology

Background:

• Patterning mammalian cell lines is crucial for biological research and microfluidic applications.
• Existing methods often require complex surface modifications or direct patterning of cell adhesion molecules.
• Hydrophobic surfaces like poly(dimethylsiloxane) (PDMS) present challenges for cell adhesion.

Purpose of the Study:

• To describe plasma stencilling techniques for patterning mammalian cell lines on diverse surfaces.
• To demonstrate the effectiveness of plasma stencilling for creating stable, long-term cell patterns.
• To explore the integration of plasma stencilling with microfluidic systems.

Main Methods:

• Utilized air plasma generated by a Tesla generator at atmospheric pressure with microengineered stencils.
• Applied patterned surface oxidation to create hydrophilic regions for cell adhesion on hydrophobic materials (PDMS, glass, polystyrene).
• Developed a novel microcapillary-based dielectric barrier discharge system for smaller cellular arrays.

Main Results:

• Achieved selective surface transformation to a hydrophilic state, enabling cell adhesion and growth.
• Demonstrated that adhesion proteins from media spontaneously assemble on hydrophilic regions, guiding cell growth.
• Successfully generated linear patterns and cellular arrays, with patterns remaining confined for over 10 days.
• Showcased the potential for integrating cell patterns into microfluidic systems via PDMS-PDMS plasma bonding.

Conclusions:

• Plasma stencilling is a simple, rapid, inexpensive, and reproducible method for patterning mammalian cell lines.
• The technique obviates the need for direct patterning of cell adhesion molecules.
• Plasma stencilling offers a potentially universal capability for cell line patterning, particularly for microfluidic applications.