Mechanistic adaptability of cancer cells strongly affects anti-migratory drug efficacy

Area of Science:

• Biomedical Engineering
• Cancer Biology
• Materials Science

Background:

• Cancer metastasis is a major cause of cancer mortality.
• Drug screening for anti-metastasis therapies often uses 3D hydrogel models mimicking the extracellular matrix (ECM).
• Understanding how cancer cells invade through the ECM is crucial for developing effective treatments.

Purpose of the Study:

• To develop a mechanically tuneable collagen hydrogel model to simulate cancer cell invasion into heterogeneous tumor stroma.
• To investigate the impact of ECM biophysical properties on cancer cell migration and drug efficacy.
• To assess how different anti-metastasis drugs perform under varying matrix conditions.

Main Methods:

• Fabrication of a mechanically tuneable collagen hydrogel system.
• Monitoring 3D invasion of highly malignant breast cancer cells (MDA-MB-231).
• Conducting migration assays with drugs targeting cell migration mechanisms across diverse ECMs with varied biophysical properties.

Main Results:

• Drug effects on cancer cell migration were highly dependent on matrix mechanics and microarchitecture.
• Cytoskeletal contractility inhibitors reduced migration in sparse gels.
• Proteolysis inhibitors were effective in retarding migration in dense gels.
• Cancer cells demonstrated adaptability in switching invasion mechanisms based on ECM conditions.

Conclusions:

• The efficacy of anti-metastasis drugs is significantly influenced by the biophysical properties of the tumor microenvironment.
• Cancer cells exhibit plasticity in their invasion strategies, adapting to different ECM conditions.
• Incorporating ECM biophysical properties into anti-metastasis drug screening is essential for developing effective therapies.