Three-Dimensional Cell Culture and Drug Testing in a Microfluidic Sidewall-Attached Droplet Array

Area of Science:

• Biotechnology
• Cell Biology
• Microfluidics

Background:

• Three-dimensional (3D) cell culture models offer superior physiological relevance compared to traditional two-dimensional (2D) cultures.
• Existing 3D culture methods face challenges in mimicking complex in vivo cellular microenvironments and enabling high-throughput analysis.

Purpose of the Study:

• To develop and optimize a novel droplet-based 3D cell culture system.
• To demonstrate the system's capability for cell culture, drug treatment, and analysis in nanoliter droplets.

Main Methods:

• A droplet array was fabricated on a Polydimethylsiloxane (PDMS) chip sidewall for cell culture.
• A capillary-based liquid handling system was employed for droplet generation, cell manipulation, and drug treatment.
• Confocal laser scanning microscopy was utilized for in situ observation and scanning of 3D cell spheroids.

Main Results:

• The system successfully cultured HepG2 cells in nanoliter droplets, preventing adherence to the chip surface.
• Optimization studies identified key parameters for droplet volume, cell density, and PDMS fabrication.
• The platform facilitated drug stimulation testing of doxorubicin on 3D cell spheroids.

Conclusions:

• The novel droplet-based 3D cell culture method provides a versatile platform for mimicking in vivo conditions.
• This system enables efficient, high-throughput screening of drug efficacy on 3D cell cultures.
• The technology holds promise for advancing drug discovery and personalized medicine.