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ABC transporters and sterol absorption.
Robert A Hegele1, John F Robinson
1Blackburn Cardiovascular Genetics Laboratory, Robarts Research Institute, 406-100 Perth Drive, London, Ontario, Canada N6A 5K8. hegele@robarts.ca
Current Drug Targets. Cardiovascular & Haematological Disorders
|February 22, 2005
Summary
Recent studies reveal how adenosine triphosphate (ATP) binding cassette (ABC) transporters limit cholesterol absorption and block plant sterol uptake in the intestine. This enhances understanding of sterol metabolism and potential hypercholesterolemia treatments.
Area of Science:
- Molecular Biology
- Metabolism Research
- Genetics
Background:
- Intestinal sterol absorption is crucial for cholesterol homeostasis.
- Adenosine triphosphate (ATP) binding cassette (ABC) transporters play a key role in limiting dietary cholesterol absorption.
- These transporters also act as a barrier against plant sterol absorption in humans.
Purpose of the Study:
- To elucidate the molecular mechanisms underlying intestinal sterol absorption.
- To investigate the role of ABC transporters in regulating cholesterol and plant sterol uptake.
- To explore potential therapeutic targets for hypercholesterolemia and vascular disease.
Main Methods:
- Molecular studies of monogenic disorders affecting lipoprotein metabolism.
- Investigations using induced-mutant mouse models.
- Analysis of genetic defects causing sitosterolemia.
Main Results:
- Identification of specific ABC transporters involved in effluxing cholesterol from enterocytes.
- Demonstration that defects in ABC transporter genes lead to impaired plant sterol absorption (sitosterolemia).
- Confirmation of the critical role of these transporters in intestinal sterol absorption through mouse studies.
Conclusions:
- ABC transporters are essential regulators of intestinal sterol absorption, impacting both cholesterol and plant sterol uptake.
- Understanding these mechanisms offers new avenues for treating hypercholesterolemia.
- Findings may contribute to developing strategies for managing vascular disease risk by optimizing lipid levels.