ABCA1-dependent serum cholesterol efflux capacity inversely correlates with pulse wave velocity in healthy subjects

Area of Science:

• Cardiovascular Physiology
• Lipid Metabolism
• Vascular Biology

Background:

• High-density lipoprotein (HDL) is recognized for its antiatherogenic properties, primarily its ability to facilitate cholesterol efflux from cells.
• The specific impact of HDL's cholesterol efflux capacity (CEC) on vascular physiology, particularly arterial stiffness, remains incompletely understood.
• ABCA1 transporter plays a crucial role in mediating cholesterol efflux, making ABCA1-dependent CEC a key indicator of HDL functionality.

Purpose of the Study:

• To investigate the relationship between ABCA1-dependent serum cholesterol efflux capacity (CEC) and pulse wave velocity (PWV) in healthy subjects.
• To determine if HDL functionality, specifically ABCA1-mediated CEC, is associated with arterial stiffness, a marker of vascular health.
• To compare the predictive value of ABCA1-dependent CEC versus serum HDL cholesterol levels on PWV.

Main Methods:

• Serum samples from 167 healthy individuals were analyzed for ABCA1-dependent CEC using [(3)H]cholesterol-labeled J774 macrophages stimulated with the serum.
• Carotid-femoral pulse wave velocity (PWV), an established measure of arterial stiffness, was assessed using a high-fidelity tonometer.
• Statistical analyses, including correlation and multiple regression, were performed to evaluate the association between ABCA1-dependent CEC and PWV, controlling for relevant covariates.

Main Results:

• A significant inverse correlation was observed between ABCA1-dependent CEC and PWV (r = -0.183; P = 0.018).
• Multiple regression analysis confirmed that PWV was significantly and negatively associated with ABCA1-dependent CEC (β = -0.204; 95% CI, -0.371 to -0.037) after adjusting for age, sex, BMI, blood pressure, and lipid/glucose levels.
• Serum HDL cholesterol level showed no significant correlation with PWV (r = -0.002; P = 0.985).

Conclusions:

• ABCA1-dependent cholesterol efflux capacity of HDL is a significant predictor of arterial stiffness in healthy individuals.
• HDL functionality, rather than solely HDL cholesterol concentration, plays a crucial role in maintaining vascular health and preventing arterial stiffness.
• These findings highlight the importance of assessing HDL function for a comprehensive understanding of cardiovascular risk and the development of targeted interventions.