Droplet Array-Based 3D Coculture System for High-Throughput Tumor Angiogenesis Assay

Area of Science:

• Oncology
• Biotechnology
• Cell Biology

Background:

• Tumor angiogenesis is crucial for cancer growth and spread, involving complex cell interactions.
• Existing assays lack the throughput for simultaneous multi-factor analysis of tumor angiogenesis.

Purpose of the Study:

• To develop a high-throughput microfluidic droplet array system for investigating tumor angiogenesis.
• To enable concurrent examination of multiple factors in tumor-endothelial cell interactions.

Main Methods:

• A two-layer polydimethylsiloxane chip with paired-well droplet arrays was utilized.
• Tumor cells were 3D-cultured in one droplet, while human umbilical vein endothelial cells (HUVECs) were 2D-cultured in a paired droplet.
• A novel fusion method combined droplets for coculture, enabling tumor angiogenesis assays.

Main Results:

• 3D-cultured tumor cells formed hypoxic aggregates, secreting more vascular endothelial growth factor (VEGF) than 2D cultures.
• Coculture significantly enhanced HUVEC tubule formation, indicating robust angiogenesis induction.
• The system supported 54 parallel assays, allowing investigation of distinct tumor cells and drug responses (e.g., Fingolimod).

Conclusions:

• The droplet-based assay facilitates high-throughput evaluation of multicellular interactions in tumor sprouting angiogenesis.
• This system offers a convenient platform for studying tumor angiogenesis and cell-cell interactions.
• The assay is adaptable for diverse research on intercellular communication in biological systems.