VE-cadherin RGD motifs are dispensable for cell-cell junctions, endothelial barrier function and monocyte...

Area of Science:

• Cell biology
• Vascular biology
• Molecular biology

Background:

• Vascular endothelial cadherin (VE-cadherin) is vital for endothelial cell-cell junctions and vascular integrity.
• VE-cadherin's extracellular domain has two arginine-glycine-aspartate (RGD) motifs, known integrin-binding sites.
• The role of these RGD motifs in VE-cadherin function is not fully understood.

Purpose of the Study:

• To investigate the functional significance of the RGD motifs in VE-cadherin.
• To determine if RGD motifs are necessary for endothelial junction formation and barrier function.
• To assess the impact of RGD motif mutations on monocyte transmigration.

Main Methods:

• Generated VE-cadherin variants with mutated RGD sequences (RGD>RGE).
• Utilized immunofluorescence microscopy to analyze junction formation.
• Employed electric cell-substrate impedance sensing (ECIS) to measure endothelial barrier function.
• Conducted monocyte transmigration assays to evaluate leukocyte extravasation.

Main Results:

• VE-cadherin RGD>RGE variants formed stable endothelial cell-cell junctions comparable to wild-type.
• Endothelial barrier function remained intact in cells expressing VE-cadherin RGD>RGE variants.
• Mutations in RGD motifs did not impede monocyte transmigration across the endothelial monolayer.

Conclusions:

• The arginine-glycine-aspartate (RGD) motifs within VE-cadherin are dispensable for endothelial junction assembly.
• VE-cadherin RGD motifs do not play a critical role in maintaining endothelial barrier integrity.
• These findings suggest that VE-cadherin RGD motifs are not essential for regulating monocyte extravasation.