Deterministic culturing of single cells in 3D.

Area of Science:

• Biomedical Engineering
• Cancer Research
• Cell Biology

Background:

• 3D cell culture models are crucial for in vitro tissue representation.
• Current methods use bulk cell populations, limiting single-cell analysis.
• Physiologically relevant matrix conditions are essential for accurate modeling.

Purpose of the Study:

• To present an alternative method for culturing individually selected single cells.
• To investigate tumor development and heterogeneity from isolated cells.
• To explore phenotypic heterogeneity in cancer research.

Main Methods:

• Utilizing matrix gel islands on cell culture dishes for single-cell support.
• Employing a microfluidic setup with glass capillaries for single-cell extraction and seeding.
• Applying morphometry assays to analyze tumor characteristics, focusing on breast cancer.

Main Results:

• Individual cells cultured in isolation evolved into tumors with diverse characteristics.
• Phenotypic heterogeneity was observed and studied in luminal A breast cancer models.
• Intratumor heterogeneity may arise from individually seeded cells, increasing with culture time.
• A correlation was found between rapid tumor growth and larger, more heterogeneous nuclei.

Conclusions:

• The proposed method enables the study of single-cell-derived tumor evolution and heterogeneity.
• This approach offers insights into the origins of tumor diversity.
• The findings highlight the potential for studying cancer aggressiveness and phenotypic plasticity.