Breast Cancer Cell Line Aggregate Morphology Does Not Predict Invasive Capacity

Area of Science:

• Oncology
• Cell Biology
• Biophysics

Background:

• Breast cancer invasion and metastasis require breaching the basement membrane and navigating dense collagen-rich tissue.
• Previous research indicated a correlation between breast cancer cell aggregate morphology and invasive potential.
• Similarities in gene expression patterns were observed among cell lines with the same aggregate morphology.

Purpose of the Study:

• To evaluate if cell and aggregate morphology can predict invasive capacity in physiologically relevant 3D environments.
• To assess the utility of a 3D multicellular invasion assay in recapitulating in vivo conditions.
• To determine the relationship between cell morphology, invasion assays, and gene expression profiles.

Main Methods:

• Six breast cancer cell lines with diverse aggregate morphologies were utilized.
• Standard 2D gap assays were performed to measure migratory speed.
• A 3D spheroid invasion assay was employed to assess invasive capacity in a collagen I-rich environment.
• Gene expression profiles were analyzed and correlated with invasion assay results.

Main Results:

• Breast cancer cell aggregate morphology alone was insufficient to predict 2D migratory speed or 3D invasive capacity.
• The 3D spheroid invasion assay demonstrated a strong correlation with gene expression profiles.
• This suggests the 3D assay is a functional predictor of invasive potential.

Conclusions:

• Cell aggregate morphology is not a reliable sole predictor of breast cancer cell invasion.
• The 3D spheroid invasion assay provides a cost-effective and functional method for assessing breast cancer invasive capacity.
• Gene expression profiling further supports the validity of the 3D spheroid invasion assay as a predictive tool.