Related Experiment Video

Updated: Aug 15, 2026

Cholesterol Efflux Assay
07:54

Cholesterol Efflux Assay

Published on: March 6, 2012

ATP-binding cassette transporter A1: a cell cholesterol exporter that protects against cardiovascular disease

John F Oram1, Jay W Heinecke

  • 1Department of Medicine, University of Washington, Seattle, WA 98195-6426, USA. joram@u.washington.edu

Physiological Reviews
|September 27, 2005
PubMed

Insights

The ATP-binding cassette transporter A1 (ABCA1) pathway is crucial for cholesterol removal and cardiovascular health. Impaired ABCA1 function contributes to atherosclerosis, particularly in metabolic disorders, highlighting its therapeutic potential.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Cardiovascular Science

Background:

  • High-density lipoprotein (HDL) levels correlate inversely with cardiovascular disease risk.
  • ATP-binding cassette transporter A1 (ABCA1) facilitates cholesterol and phospholipid transport to HDL, playing a key role in HDL metabolism.
  • ABCA1 is vital for initiating HDL particle formation in the liver and protecting arteries from atherosclerosis in macrophages.

Purpose of the Study:

  • To explore the role of the ABCA1 pathway in cardiovascular disease and its potential as a therapeutic target.
  • To investigate how metabolic syndrome and diabetes affect ABCA1 function and cholesterol export.
  • To examine the impact of oxidative modifications on HDL and ABCA1-mediated cholesterol removal.

Main Methods:

  • Review of existing literature on ABCA1 function, genetics, and its role in HDL metabolism and atherogenesis.
  • Analysis of studies involving genetic manipulation of ABCA1 in animal models.
  • Examination of the effects of metabolites associated with metabolic syndrome and diabetes on ABCA1 stability and activity.

Main Results:

  • ABCA1 mutations lead to severe HDL deficiency, cholesterol deposition, and atherosclerosis.
  • Genetic alterations in ABCA1 expression influence plasma HDL levels and atherogenesis in mice.
  • Metabolic syndrome and diabetes-associated metabolites destabilize ABCA1, reducing macrophage cholesterol export.
  • Oxidative modifications of HDL impair ABCA1-mediated cholesterol removal in cardiovascular disease patients.

Conclusions:

  • An impaired ABCA1 pathway likely contributes to increased atherosclerosis in inflammatory and metabolic disorders.
  • The ABCA1 pathway represents a significant therapeutic target for cardiovascular disease treatment.

More Related Videos

High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay08:18

High-throughput Nitrobenzoxadiazole-labeled Cholesterol Efflux Assay

Published on: January 7, 2019

High-Density Lipoprotein-Specific Phospholipid Efflux Assay07:08

High-Density Lipoprotein-Specific Phospholipid Efflux Assay

Published on: September 30, 2025

Related Concept Videos

The ADP/ATP Carrier Protein01:42

The ADP/ATP Carrier Protein

ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
ABC Transporters: Exporter01:31

ABC Transporters: Exporter

ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
Cholesterol: Significance and Regulation01:29

Cholesterol: Significance and Regulation

Although not a source of energy, cholesterol plays a significant role as a foundational structure for bile salts, steroid hormones, and vitamin D, as well as being a crucial component of plasma membranes. Approximately 15% of blood cholesterol is derived from our diet, with the remainder synthesized from acetyl CoA by the liver and intestines. Cholesterol is eliminated from the body through its conversion into bile salts, which are eventually discarded in the feces.
Considering cholesterol and...
Carrier-Mediated Transport01:06

Carrier-Mediated Transport

Carrier-mediated transport is a pivotal process in drug absorption, particularly for lipid-insoluble drugs, and encompasses facilitated diffusion and active transport. Facilitated diffusion allows drugs to move along their concentration gradient without energy expenditure, while active transport utilizes ATP to drive drug movement against this gradient.
Active transport involves two types of membrane-spanning transporters: uptake and efflux. Uptake transporters are expressed in the small...
ABC Transporters: Importer01:27

ABC Transporters: Importer

ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters01:16

Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters

The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...