A microfluidic cell co-culture platform with a liquid fluorocarbon separator.

Area of Science:

• Biotechnology
• Cell Biology
• Microfluidics

Background:

• Effective cell co-culture requires precise spatial separation of cell types.
• Existing microfluidic platforms often face challenges with long-term barrier stability and fluidic seal quality.

Purpose of the Study:

• To develop and characterize a microfluidic cell co-culture platform using a liquid fluorocarbon oil barrier.
• To evaluate the stability, pressure tolerance, and fluidic seal performance of the oil barrier.
• To demonstrate the biological applicability of the platform for neuronal co-culture and synapse analysis.

Main Methods:

• Fabrication of a microfluidic device with distinct culture chambers separated by a liquid fluorocarbon oil barrier.
• Characterization of the oil barrier's stability over time and its pressure tolerance limit.
• Assessment of fluidic seal quality by testing the barrier's ability to prevent diffusion of low molecular weight dyes.
• Demonstration of biological application through co-culture and transfection of primary hippocampal neurons.

Main Results:

• The liquid fluorocarbon oil barrier remained effective for multiple days.
• The oil barrier withstood a maximum pressure difference of approximately 3.43 kPa before failure.
• The oil barrier provided a superior fluidic seal compared to a solid polydimethylsiloxane (PDMS) valve design, effectively blocking CellTracker dyes.
• Successful co-culture and transfection of primary hippocampal neurons were achieved, allowing observation of synaptic contacts.

Conclusions:

• The developed microfluidic platform with a liquid fluorocarbon oil barrier offers a robust and effective solution for cell co-culture.
• The oil barrier technology provides excellent long-term stability and superior fluidic isolation for sensitive biological applications.
• This platform facilitates advanced studies in neuroscience, particularly in analyzing neuronal communication and synaptic plasticity.