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Ultrasound Assessment of Endothelial-Dependent Flow-Mediated Vasodilation of the Brachial Artery in Clinical Research
Published on: October 22, 2014
Association between increased arterial-wall thickness and impairment in ABCA1-driven cholesterol efflux: an
Marjel J van Dam1, Eric de Groot, Susanne M Clee
1Departments of Vascular Medicine, Academic Medical Center, University of Amsterdam, Amsterdam, The Netherlands.
Insights
Impaired ATP-binding cassette A1 transporter (ABCA1) function reduces cellular cholesterol efflux, leading to lower HDL cholesterol and increased arterial wall thickness. Enhancing cholesterol efflux may prevent atherosclerosis progression.
Area of Science:
- Cardiovascular Science
- Metabolic Research
- Genetics
Background:
- Low HDL cholesterol is linked to cardiovascular risk, involving cellular cholesterol efflux.
- Cholesterol efflux is mediated by ATP-binding cassette A1 transporter (ABCA1), crucial for HDL production.
- ABCA1 function is a key determinant of reverse cholesterol transport and cardiovascular health.
Purpose of the Study:
- To investigate the relationship between cellular cholesterol efflux, HDL levels, and arterial wall changes.
- To assess the impact of impaired ABCA1 function on these parameters.
- To explore potential therapeutic targets for atherosclerosis.
Main Methods:
- Study included 30 individuals with ABCA1 mutations and 110 controls.
- Measured plasma HDL cholesterol and carotid artery intima-media thickness (IMT) via ultrasonography.
- Assessed cholesterol efflux from skin fibroblasts in a subset of participants.
Main Results:
- ABCA1 mutation carriers exhibited reduced cholesterol efflux, lower HDL cholesterol, and increased IMT.
- A significant positive correlation was found between HDL cholesterol and cholesterol efflux (r=0.90).
- Negative correlations were observed between efflux mediated by apolipoprotein-AI and HDL particles with IMT in mutation carriers.
Conclusions:
- A direct link exists between ABCA1-mediated cholesterol efflux and arterial wall thickness.
- Increasing cellular cholesterol efflux may inhibit atherosclerosis progression.
- Targeting ABCA1 efflux could be a strategy to prevent cardiovascular disease before symptoms manifest.
Background:
Decreased concentrations of HDL cholesterol are associated with increased cardiovascular risk. These concentrations are directly related to cholesterol efflux from cells-the first step and a key process in reverse cholesterol transport. Cholesterol efflux is mediated by the ATP-binding cassette A1 transporter (ABCA1), the rate-limiting step in the production of HDL. We aimed to assess the relation between cholesterol efflux, HDL concentrations, and arterial-wall changes in individuals with impaired ABCA1 function.
Methods:
We investigated 30 individuals from families with ABCA1 mutations, and 110 controls matched for age, sex, and ethnic origin. We measured concentrations of HDL cholesterol in plasma and intima-media thickness of the carotid arteries by B-mode ultrasonography in all participants. We also measured cholesterol efflux from skin fibroblasts in nine individuals with ABCA1 mutations and in ten controls.
Findings:
Individuals with ABCA1 mutations had lower amounts of cholesterol efflux, lower HDL cholesterol concentrations, and greater intima-media thicknesses than controls. An intima-media thickness at the upper limit of normal (0.80 mm) was reached by age 55 years in the ABCA1 heterozygotes, and at age 80 years in unaffected controls (p<0.0001). Additionally, strong positive correlations were seen between HDL cholesterol concentrations and cholesterol efflux (r=0.90, p=0.001), and negative correlations between apolipoprotein-AI-mediated (r=-0.61, p=0.030) and HDL-particle-mediated (r=-0.60, p=0.018) efflux and intima-media thickness in the ABCA1 mutation carriers.
Interpretation:
These results show a direct relation between ABCA1-mediated cellular cholesterol efflux and arterial-wall thickness, and therefore suggest that increasing efflux could inhibit atherosclerosis progression before the manifestation of symptomatic cardiovascular disease.
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