SOCS1 prevents graft arteriosclerosis by preserving endothelial cell function

Area of Science:

• Cardiovascular Research
• Immunology
• Vascular Biology

Background:

• Graft arteriosclerosis (GA) is a primary cause of late cardiac allograft failure.
• GA involves immune-mediated endothelial activation, vascular inflammation, and neointima formation.
• Suppressor of cytokine signaling 1 (SOCS1) regulates cytokine signaling and is expressed in endothelial cells (ECs).

Purpose of the Study:

• To investigate the role of SOCS1 in the pathogenesis of graft arteriosclerosis (GA).
• To determine if SOCS1 expression in endothelial cells influences GA development and progression.

Main Methods:

• Histological analysis of human coronary arteries with and without GA.
• Utilized SOCS1 knockout and vascular endothelial SOCS1 (VESOCS1) transgenic mice in an aorta transplant model of GA.
• Performed in vitro assays using isolated mouse aortic ECs.

Main Results:

• Reduced endothelial SOCS1 expression was observed in human GA and atherosclerosis.
• SOCS1 deficiency in mice led to endothelial dysfunction and exacerbated GA, increasing leukocyte recruitment and neointima formation.
• Endothelial overexpression of SOCS1 (VESOCS1) attenuated arterial rejection, suppressed adhesion molecule induction, and preserved vascular function during GA.

Conclusions:

• SOCS1 plays a critical protective role in preventing GA progression.
• SOCS1 preserves endothelial function by modulating adhesion molecule expression and restraining inflammatory cell infiltration.
• Targeting endothelial SOCS1 may offer a therapeutic strategy for preventing cardiac allograft failure.