Continuous sorting of heterogeneous-sized embryoid bodies.

Area of Science:

• Biotechnology
• Stem Cell Biology
• Microfluidics

Background:

• Embryoid bodies (EBs) are crucial for stem cell research but vary significantly in size.
• Precise size-based separation of EBs is challenging with current methods.
• Consistent EB size is vital for reproducible differentiation studies.

Purpose of the Study:

• To develop and validate a microfluidic device for high-throughput sorting of embryoid bodies (EBs) across a wide size range.
• To demonstrate the device's capability for on-chip separation of mouse EBs into distinct size populations.
• To facilitate subsequent stem cell differentiation studies by providing size-defined EB inputs.

Main Methods:

• A microfluidic chip with precisely spaced pillars was designed to manipulate fluid flow.
• Polystyrene beads of varying sizes (90, 175, 275 microm) were used to validate separation efficiency.
• Mouse EBs were introduced to the device for on-chip size-based sorting.

Main Results:

• The microfluidic device achieved separation efficiencies approaching 100% for polystyrene beads.
• Demonstrated the first successful on-chip separation of mouse EBs into three distinct size groups.
• The device effectively sorts EBs with dynamic size ranges up to 300 micrometers.

Conclusions:

• The developed microfluidic device offers a robust solution for size-based sorting of embryoid bodies.
• This technology enables precise control over EB input size, significantly improving downstream differentiation studies.
• The device has broad implications for stem cell research, developmental biology, and regenerative medicine.