Contact guidance diversity in rotationally aligned collagen matrices

Area of Science:

• Biomedical Engineering
• Cell Biology
• Cancer Research

Background:

• Cancer cell metastasis drives approximately 90% of cancer-related deaths.
• Contact guidance, directed cell migration along aligned extracellular matrix, is crucial for cancer invasion.
• Existing 2D models inadequately represent in vivo 3D environments for studying cell-ECM interactions.

Purpose of the Study:

• To investigate differences in 3D contact guidance between mesenchymal (MDA-MB-231) and amoeboid (MTLn3) cancer cells.
• To assess the impact of extracellular matrix stiffness and cell contractility on contact guidance fidelity.
• To develop a 3D system for studying cell migration along aligned collagen fibers.

Main Methods:

• Utilized rotationally aligned collagen gels to create 3D contact guidance cues.
• Compared migration of MDA-MB-231 and MTLn3 cells in aligned collagen gels.
• Modulated collagen stiffness via glycation and inhibited cell contractility (ROCK inhibition).

Main Results:

• MDA-MB-231 cells exhibited high directional migration in aligned gels, while MTLn3 cells showed no directionality.
• Increased collagen stiffness reduced MDA-MB-231 directionality.
• Partial inhibition of cell contractility significantly decreased MDA-MB-231 directionality, with ROCK inhibition being most potent.
• Cell directionality and speed were tightly coupled in 3D, unlike in 2D environments.

Conclusions:

• Cancer cell migration directionality in 3D is more sensitive to modulation of the cell's contractile apparatus than to changes in extracellular matrix stiffness.
• Cell contractility plays a more dominant role in 3D contact guidance than previously appreciated.
• The developed 3D system provides a valuable platform for studying cell migration in complex microenvironments.