Organotypic platform for studying cancer cell metastasis

Area of Science:

• Cancer Biology
• Cellular and Molecular Oncology
• Biomedical Engineering

Background:

• Cancer metastasis is the primary cause of cancer-related mortality.
• Understanding cancer cell migration requires models that mimic the tumor microenvironment.
• Current in vitro models often fail to accurately replicate in vivo conditions.

Purpose of the Study:

• To evaluate organotypic liver and brain slices as a platform for studying cancer metastasis.
• To assess the stability and suitability of these slices for in vitro metastatic assays.
• To investigate the invasion patterns and behavior of breast cancer cells in distinct tissue environments.

Main Methods:

• Organotypic liver and brain slices were cultured for 3 days, monitoring morphology and viability.
• MDA-MB-231 breast cancer cells and a high-motility subpopulation were used to evaluate invasion.
• Cell stiffness, adhesion forces, and invasion patterns were analyzed in both slice types.
• The effect of Ras/MAPK/ERK pathway inhibition on cell invasiveness was assessed.

Main Results:

• Organotypic slices demonstrated stability as a 3D tissue platform for metastatic assays.
• More aggressive cancer cell subpopulations exhibited lower stiffness and adhesion, enhancing invasion.
• Distinct invasion patterns were observed: amoeboid-like migration in brain slices and mesenchymal/collective modes in liver slices.
• Inhibition of the Ras/MAPK/ERK pathway reduced cancer cell invasiveness by increasing stiffness and adhesion.

Conclusions:

• Organotypic liver and brain slices provide a more realistic in vitro model for studying cancer metastasis.
• Cancer cell invasion dynamics and patterns vary significantly between different tissue microenvironments.
• Targeting the Ras/MAPK/ERK pathway presents a potential strategy to inhibit cancer cell metastasis.