Flow analysis on microcasting with degassed polydimethylsiloxane micro-channels for cell patterning with cross-linked...

Area of Science:

• Biomaterials Science
• Cell Biology
• Microfluidics

Background:

• Patterned cell culturing is crucial for understanding cell behavior influenced by geometry.
• Previous methods used agarose gel microstructures fabricated by microcasting with polydimethylsiloxane (PDMS) molds.
• The influence of solution viscosity on microcasting was previously unknown.

Purpose of the Study:

• To investigate the effect of micro-channel dimensions and solution viscosity on microcasting processes.
• To develop a faster method for creating patterned cell culture systems.
• To fabricate and test a cross-linked albumin microstructure for cell patterning.

Main Methods:

• Experimental investigation of solution flow in PDMS micro-channels.
• Numerical simulation of micro-channel flow dynamics.
• Microcasting of cross-linked albumin solution to create microstructures on cell culture dishes.
• Cultivation of mouse skeletal myoblast cell line C2C12 on fabricated microstructures.

Main Results:

• Degassed PDMS molds successfully drove solutions with viscosity below 575 mPa·s.
• A simulation model was developed to accurately estimate flow rates in micro-channels.
• Cross-linked albumin microstructures were fabricated, exhibiting cellular repellency after dehydration.
• Successful patterning of C2C12 cells was observed after 7 days of cultivation.

Conclusions:

• Microcasting with cross-linked albumin offers a quicker alternative to agarose gel casting for patterned cell culture.
• The developed simulation model aids in optimizing microcasting parameters.
• This technique facilitates the study of cell-geometry interactions.