Dynamic endothelial cell rearrangements drive developmental vessel regression

Area of Science:

• Vascular Biology
• Cellular Dynamics
• Developmental Biology

Background:

• Blood vessel network formation involves pruning unnecessary connections.
• The cellular and molecular mechanisms of blood vessel regression remain largely unknown.

Purpose of the Study:

• To elucidate the cellular and molecular mechanisms underlying blood vessel regression.
• To investigate the role of endothelial cell migration in vascular remodeling.

Main Methods:

• Development and analysis of the first axial polarity map of endothelial cells in a remodeling vascular network.
• Observation of dynamic and polarized endothelial cell migration during vessel regression.

Main Results:

• Blood vessel regression is mediated by dynamic, polarized migration of endothelial cells, akin to reverse anastomosis.
• Balanced endothelial cell movement maintains the primitive vascular plexus in a metastable state under low shear stress.
• Flow-induced polarized migration breaks symmetry, stabilizing high flow/shear segments and causing regression of low flow/shear segments.

Conclusions:

• Endothelial cell migration is a key driver of blood vessel regression.
• Vascular network patterning relies on a dynamic balance of endothelial cell movement regulated by shear stress.
• Understanding these principles offers insights into vascular development and disease.