Rapid Production of Cell-Laden Microspheres Using a Flexible Microfluidic Encapsulation Platform

Area of Science:

• Biomaterials Engineering
• Microfluidics
• Cell Encapsulation Technology

Background:

• Cell-laden hydrogel microspheres are crucial for drug screening and regenerative medicine.
• Existing microfluidic platforms face limitations in microsphere size control and production scalability.
• Traditional microfabrication restricts microsphere diameter and increases design costs.

Purpose of the Study:

• To develop a novel microfluidic platform for rapid, high-density cell encapsulation in hydrogel microspheres.
• To overcome limitations of existing methods regarding microsphere size, uniformity, and production efficiency.
• To enable tunable production of cell-laden microspheres for diverse biomedical applications.

Main Methods:

• A new molding technique was used to create a microfluidic device with adjustable channel sizes.
• A modified T-junction design facilitates rapid photocrosslinking (≈1 s per microsphere).
• The platform accommodates various photocrosslinkable hydrogels like PEG-DA, PEG-fibrinogen, and GelMA.

Main Results:

• The platform produces highly uniform microspheres with diameters ranging from 300-1100 µm.
• High cell densities (10-60 million cells mL⁻¹) are achieved with even cell distribution.
• Encapsulation rates reach up to 1 million cells per minute, maintaining high cell viability and activity.
• Multiple cell types were successfully encapsulated and cultured long-term.

Conclusions:

• The developed microfluidic platform offers a versatile and efficient solution for producing tunable, cell-laden hydrogel microspheres.
• This technology supports critical applications such as injectable cell therapy, bioreactor expansion, and high-throughput drug testing.
• The platform's design allows for rapid iteration and scale-up, making it a valuable tool for biomedical research and development.