An Automated Digital Microfluidic System Based on Inkjet Printing

Area of Science:

• Biotechnology
• Cell Biology
• 3D Cell Culture

Background:

• Three-dimensional (3D) cell spheroids enhance cellular interactions, viability, and proliferation, crucial for cancer research and drug testing.
• Spheroid size critically influences cellular functions and drug response, necessitating precise size control for experiments.
• Conventional spheroid culture methods face challenges in size consistency, uniformity, and throughput.

Purpose of the Study:

• To develop an automated, intelligent inkjet printing system for precise spheroid size control and high-throughput spheroid generation.
• To overcome limitations of conventional 3D cell culture techniques.
• To enable customized spheroid sizes for various drug sensitivity experiments and organoid culture.

Main Methods:

• An automated inkjet printing system was developed with algorithms to precisely control droplet volume for variable spheroid sizes.
• A bidirectional compensation method was used to achieve spheroid size uniformity (coefficient of variation <10%).
• An automatic pipetting module enabled high-throughput spheroid preparation, demonstrated by printing 216 spheroids in 11 minutes.

Main Results:

• The system successfully generated spheroids with precise size control and high uniformity.
• High-throughput printing of a 3x3 spheroid array in a 24-well plate was achieved rapidly.
• Mouse small intestinal organoids were successfully printed and cultured for 7 days, showing potential for further applications.

Conclusions:

• The developed automated inkjet printing system offers precise control over spheroid size and high-throughput capabilities.
• This technology significantly advances 3D cell culture for applications in drug screening and personalized medicine.
• The system's ability to culture organoids highlights its broad potential in biomedical research.