Rapid Enhancement of Cellular Spheroid Assembly by Acoustically Driven Microcentrifugation

Area of Science:

• Biotechnology
• Microfluidics
• Cell Biology

Background:

• Cellular spheroids are crucial for studying tumor biology and drug efficacy.
• Current spheroid formation methods are often slow, labor-intensive, and lack precise control.
• Integrating microfluidics with standard tissue culture plates is desirable for high-throughput applications.

Purpose of the Study:

• To develop a rapid and controllable method for assembling cellular spheroids using acoustically driven microcentrifugation.
• To demonstrate the compatibility of this technique with standard laboratory plasticware.
• To produce spheroids that mimic in vivo tumor structures for research applications.

Main Methods:

• Utilized acoustically driven microcentrifugation flows within microwells of tissue culture plates.
• Coated microwells with a low-adhesive hydrogel to facilitate cell aggregation.
• Varied acoustic input power to control compaction force and spheroid dimensions.

Main Results:

• Achieved rapid concentration of cells into tight aggregates within one minute, significantly faster than conventional methods.
• Maintained cell viability throughout the spheroid formation process.
• Demonstrated precise control over spheroid size by adjusting acoustic power, without requiring custom microfluidic geometries.
• Produced spheroids with heterogeneous cell populations and tight cell-cell interfaces, resembling in vivo tumors.

Conclusions:

• Acoustically driven microcentrifugation offers a highly efficient and controllable approach for cellular spheroid formation.
• This method is compatible with existing laboratory infrastructure, enabling high-throughput screening.
• The generated spheroids are suitable models for cancer research and drug discovery.