Mechanical control of the endothelial barrier

Area of Science:

• Cell biology
• Biophysics

Background:

• Endothelial barrier integrity relies on chemical and mechanical signals.
• Small GTPases regulate cytoskeletal dynamics impacting cell junctions.
• VE-cadherin and the actin cytoskeleton are key to cell adhesion and barrier function.

Purpose of the Study:

• To review the physical and regulatory interactions between VE-cadherin and the actomyosin cytoskeleton.
• To elucidate how cytoskeletal mechanics influence endothelial barrier regulation.
• To propose a model for signal cooperation in barrier dynamics.

Main Methods:

• Review of recent in vitro data.
• Analysis of physical and regulatory interactions.
• Hypothetical model development.

Main Results:

• A balance between Linear Adherens Junctions and Focal Adherens Junctions dictates barrier function.
• Small GTPases control actomyosin organization and mechanics to regulate this balance.
• Actomyosin-adhesion interactions are crucial for rapid barrier opening and resealing.

Conclusions:

• Cytoskeletal mechanics and VE-cadherin interactions are central to endothelial barrier control.
• Small GTPases play a critical role in modulating these interactions.
• A unified model of signal integration at the actomyosin-adhesion interface is proposed.