Functional angiogenesis requires microenvironmental cues balancing endothelial cell migration and proliferation

Area of Science:

• Biomedical Engineering
• Cell Biology
• Regenerative Medicine

Background:

• Angiogenesis, the formation of new blood vessels, is crucial for development and disease.
• In vitro models simplify the complex in vivo environment to study angiogenesis regulation.
• Extracellular matrix and biochemical cues significantly influence endothelial cell behavior.

Purpose of the Study:

• To investigate how microenvironmental cues regulate angiogenesis and microvasculature function.
• To understand the interplay between endothelial cell migration and proliferation in sprout formation.
• To develop a framework for designing biomaterials that promote functional microvasculature.

Main Methods:

• Utilized a multiplexed angiogenesis-on-a-chip platform for high-throughput analysis.
• Investigated 3D endothelial cell sprouting under defined biochemical gradients and extracellular matrix conditions.
• Assessed endothelial cell migration, proliferation, barrier function, and fluid transport.

Main Results:

• Endothelial cell migration and proliferation rates determine invasion as single cells or multicellular sprouts.
• Imbalanced migration and proliferation led to microvasculature with impaired barrier function and fluid transport.
• Restoring the balance between migration and proliferation rescued multicellular sprout invasion and function.

Conclusions:

• Microenvironmental cues critically control the balance between endothelial cell migration and proliferation.
• This balance is essential for forming functional microvasculature with proper barrier properties.
• Findings provide a basis for designing pro-angiogenic biomaterials for regenerative therapies.