Cited by 500Drug Transport and Resistance MechanismsCholesterol and Lipid MetabolismPharmacogenetics and Drug Metabolism

Bile Acid Transporters: Structure, Function, Regulation and Pathophysiological Implications

Alrefai, Waddah A., Gill, Ravinder K.·2007·Pharmaceutical Research

Abstract

Specific transporters expressed in the liver and the intestine, play a critical role in driving the enterohepatic circulation of bile acids. By preserving a circulating pool of bile acids, an important factor influencing bile flow, these transporters are involved in maintaining bile acid and cholesterol homeostasis. Enterohepatic circulation of bile acids is fundamentally composed of two major processes: secretion from the liver and absorption from the intestine. In the hepatocytes, the vectorial transport of bile acids from blood to bile is ensured by Na+ taurocholate co-transporting peptide (NTCP) and organic anion transport polypeptides (OATPs). After binding to a cytosolic bile acid binding protein, bile acids are secreted into the canaliculus via ATP-dependent bile salt excretory pump (BSEP) and multi drug resistant proteins (MRPs). Bile acids are then delivered to the intestinal lumen through bile ducts where they emulsify dietary lipids and cholesterol to facilitate their absorption. Intestinal epithelial cells reabsorb the majority of the secreted bile acids through the apical sodium dependent bile acid transporter (ASBT) and sodium independent organic anion transporting peptide (OATPs). Cytosolic ileal bile acid binding protein (IBABP) mediates the transcellular movement of bile acids to the basolateral membrane across which they exit the cells via organic solute transporters (OST). An essential role of bile acid transporters is evident from the pathology associated with their genetic disruption or dysregulation of their function. Malfunctioning of hepatic and intestinal bile acid transporters is implicated in the pathophysiology of cholestatic liver disease and the depletion of circulating pool of bile acids, respectively. Extensive efforts have been recently made to enhance our understanding of the structure, function and regulation of the bile acid transporters and exploring new potential therapeutics to treat bile acid or cholesterol related diseases. This review will highlight current knowledge about structure, function and molecular characterization of bile acid transporters and discuss the implications of their defects in various hepatic and intestinal disorders.

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Crossref · 10.1007/s11095-007-9289-1

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Authors
Alrefai, W. A., & Gill, R. K.
Affiliations
University of Illinois Chicago (US)
Corresponding author
Alrefai, Waddah A.
Venue
Pharmaceutical Research
Published
2007-04-03
Volume
24
Issue
10
Pages
1803-1823
ISSN
  • 0724-8741 (ISSN-L)
  • 1573-904X
OpenAlex
W2071450296
Cited by
500
References
215
Citations by year
2026: 20 · 2025: 19 · 2024: 24 · 2023: 21 · 2022: 33 · 2021: 27 · 2020: 23 · 2019: 34 · 2018: 33 · 2017: 24 · 2016: 27 · 2015: 22 · 2014: 28 · 2013: 29 · 2012: 27
FWCI
2.75
Type
journal article
Language
en
Open access
closed
Locations
  • Pharmaceutical Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (DK 71596)
Topics
  • Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
  • Health Sciences › Medicine › Surgery › Cholesterol and Lipid Metabolism
  • Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
Keywords
bile acid transporters, enterohepatic circulation, bile acid homeostasis, cholesterol homeostasis, normal tissue complication probability, organic anion transporting polypeptides, bile salt export pump, MRP, ASBT, ileal bile acid binding protein, cholestatic liver disease
MeSH terms
Animals, Bile Acids and Salts, Bile Canaliculi, Bile Ducts, Carrier Proteins, Cholestasis, Enterohepatic Circulation, Epithelial Cells, Humans, Intestinal Mucosa, Kidney Tubules, Proximal, Liver, Membrane Glycoproteins, Protein Conformation, Cell Polarity, ATP-Binding Cassette Transporters, Enterocytes, Hepatocytes, Symporters, Organic Anion Transporters, Sodium-Independent, Organic Anion Transporters, Sodium-Dependent

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