Endothelial barrier function is differentially regulated by CEACAM1-mediated signaling.

Area of Science:

• Vascular Biology
• Cellular Biology
• Immunology

Background:

• Carcinoembryonic antigen-related cell adhesion molecule-1 (CEACAM1) is vital for blood vessel formation.
• CEACAM1 deficiency leads to aortic plaque-like lesions, suggesting a role in adult vasculature.
• Mechanisms underlying CEACAM1's function in adult vessels are not fully understood.

Purpose of the Study:

• To investigate the role of CEACAM1 in maintaining endothelial homeostasis in adult blood vessels.
• To elucidate how CEACAM1 influences endothelial barrier function and leukocyte-endothelial interactions.

Main Methods:

• Analysis of CEACAM1-deficient mouse models.
• Assessment of endothelial cell eNOS redistribution and endothelial glycocalyx alterations.
• Evaluation of leukocyte-endothelial interactions and endothelial barrier permeability.
• Investigation of CEACAM1's impact on β-catenin and caveolin-1 phosphorylation.

Main Results:

• CEACAM1 deficiency caused eNOS redistribution and altered the endothelial glycocalyx, increasing leukocyte adhesion.
• CEACAM1's effect on endothelial barrier leakiness was age-dependent, being protective in young mice but detrimental in aged mice.
• CEACAM1 modulated phosphorylation of β-catenin and caveolin-1, key regulators of endothelial barrier function.

Conclusions:

• CEACAM1 plays a critical role in maintaining endothelial homeostasis in adult blood vessels.
• Dysregulation of CEACAM1 contributes to increased inflammation and potential plaque formation by affecting endothelial barrier integrity and leukocyte interactions.
• CEACAM1 signaling differentially regulates endothelial barrier function based on age.