Utilizing a high-throughput microdevice to study breast tumor cells clustering and metastasis

Area of Science:

• Biomedical Engineering
• Cancer Research
• Cell Biology

Background:

• Circulating tumor cell (CTC) clusters, multicellular CTC aggregates, are linked to increased distal metastasis potential compared to single CTCs.
• Limited methods exist to study cancer cell aggregation kinetics, particularly for small cell numbers, hindering understanding of CTC cluster formation.

Purpose of the Study:

• To develop and validate a high-throughput, miniaturized microwell-based cell aggregation chip (AG-chip) for characterizing tumor cell clustering.
• To investigate the aggregation capacities of different breast cancer cell lines and their correlation with metastatic potential.
• To explore the role of integrins in regulating cell clustering and adhesion.

Main Methods:

• Development of a microfluidic AG-chip utilizing microwells for high-throughput analysis of cell aggregation.
• Quantification of cell aggregation kinetics for various breast cancer cell lines (MDA-MB-231, MDA-MB-436, MCF-7, SK-BR-3).
• Assessment of integrin inhibition effects on cell adhesion and migration using the AG-chip.

Main Results:

• High metastatic breast cancer cells (MDA-MB-231, MDA-MB-436) exhibited significantly stronger aggregation capacities than low metastatic cells (MCF-7, SK-BR-3).
• The AG-chip successfully distinguished cells with similar aggregation abilities by analyzing aggregation kinetics.
• The measured aggregation ability correlated with the metastatic potential of the cancer cells.
• Inhibition of integrins was shown to regulate cell clustering by blocking cell adhesion and/or migration.

Conclusions:

• The developed AG-chip is a valuable tool for studying tumor cell clustering and aggregation kinetics.
• Cell aggregation capacity is a quantifiable indicator of metastatic potential.
• Integrin signaling plays a crucial role in mediating cell-cell adhesion and migration, influencing CTC cluster formation and subsequent metastasis.