Endothelial cell sensing, restructuring, and invasion in collagen hydrogel structures.

Area of Science:

• Biomedical Engineering
• Cell Biology
• Cancer Research

Background:

• Tumor cell invasion mechanics are studied, but less is known about vascular dynamics during cancer.
• Understanding endothelial cell interactions with the extracellular matrix (ECM) is crucial for cancer progression.

Purpose of the Study:

• Investigate endothelial cell invasion dynamics in response to varying micro-environmental geometries.
• Model cell-tissue interactions to understand tumor vascular dynamics and cancer treatment.

Main Methods:

• Fabricated diverse geometries (round/sharp) in collagen hydrogels of varying stiffness.
• Cultured endothelial cells on these structures to observe bi-directional cell-ECM interactions.

Main Results:

• Higher cell invasion frequency observed on sharper, more curved structures, especially in dense matrices.
• Round structures showed greater cell adhesion, sometimes leading to faster invasion than sharp structures.
• Invasion length correlated with increased deformation of surrounding structures, suggesting traction force signaling.

Conclusions:

• Endothelial cells sense and respond to subtle ECM geometric variations.
• Cell invasion and matrix deformation represent a balance with implications for tumor vascular abnormality.
• Findings may inform new strategies for understanding and treating cancer via cell-tissue interactions.