Ceacam1 deletion causes vascular alterations in large vessels

Area of Science:

• Endocrinology
• Vascular Biology
• Metabolic Syndrome

Background:

• Carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) is known to influence hepatic insulin clearance and endothelial survival.
• The role of CEACAM1 in macrovessel morphology and its connection to metabolic dysfunction, such as hyperinsulinemia, remained unclear.

Purpose of the Study:

• To investigate the impact of CEACAM1 deficiency on aortic morphology and vascular function.
• To explore the mechanisms linking CEACAM1, insulin resistance, and atherosclerosis.

Main Methods:

• Histological and immunohistochemical analyses of aortae from wild-type and Ceacam1-deficient (Cc1-/-) mice.
• In vitro studies using bovine aortic endothelial cells with CEACAM1 knockdown.
• Assessment of vascular reactivity, oxidative stress markers, and signaling pathways (e.g., Akt/eNOS).

Main Results:

• Cc1-/- mice exhibited impaired endothelial integrity, aortic plaque-like lesions, and increased leukocyte adhesion.
• Reduced nitric oxide (NO) production, compromised vasorelaxation, and elevated oxidative stress were observed in Cc1-/- aortae.
• CEACAM1 deficiency impaired insulin signaling pathways crucial for endothelial function, partly via altered IRS-1/SHP2 interaction.

Conclusions:

• CEACAM1 plays a critical role in maintaining aortic morphology and vascular function, independent of lipidemia.
• CEACAM1 regulates both endothelial cell-autonomous and non-autonomous mechanisms influencing vascular health.
• CEACAM1-dependent hepatic insulin clearance is a key link between metabolic abnormalities and macrovascular disease.