A platform for assessing chemotactic migration within a spatiotemporally defined 3D microenvironment

Area of Science:

• Biomedical Engineering
• Cell Biology
• Biochemistry

Background:

• Quantifying cell movement in biochemical gradients is crucial but challenging in 3D biological environments.
• Existing microfluidic methods struggle to replicate complex 3D microenvironments effectively.

Purpose of the Study:

• To introduce an accessible platform for robust soluble factor control within 3D biological matrices.
• To enable the study of cell migration and invasion under long-lasting and transient biochemical gradients.

Main Methods:

• Development of a user-friendly platform using standard laboratory tools (e.g., pipettes).
• Establishment of long-lasting (up to 10 days) linear and non-linear soluble factor concentration profiles.
• Demonstration of superimposing transient soluble factor pulses onto existing gradients.

Main Results:

• The platform successfully maintained stable concentration profiles for extended periods.
• Local soluble factor pulses were effectively superimposed on gradients.
• The system was applied to study chemotaxis of human neutrophils and invasion of MtLN3 cells in 3D collagen.

Conclusions:

• The developed platform provides robust soluble factor control in 3D matrices, overcoming previous limitations.
• This technology facilitates biologically relevant signaling studies investigating cell migratory behavior.
• It opens new avenues for understanding complex cellular responses in physiologically representative environments.