Bile secretion-related liver enzymes and transporters

Bile secretion-related liver enzymes and transporters comprise a complex network of proteins, including ATP-binding cassette (ABC) transporters and solute carriers (SLC), that facilitate the movement of bile acids, bilirubin, and lipids from hepatocytes into the biliary system (StatPearls, 2023). Key members include the Bile Salt Export Pump (BSEP/ABCB11), Multidrug Resistance-associated Protein 2 (MRP2/ABCC2), and the Sodium-taurocholate Cotransporting Polypeptide (NTCP/SLC10A1) (UniProt, 2024). These proteins are essential for maintaining cholesterol homeostasis and aiding in the digestion of dietary fats by ensuring the proper composition and flow of bile (KEGG hsa04976). The system is tightly regulated by nuclear receptors, most notably the Farnesoid X Receptor (FXR), which acts as a metabolic sensor for bile acid levels (PubMed, PMID: 28611164). Dysregulation of this system, whether through genetic mutations or drug-induced inhibition, leads to cholestatic liver diseases, jaundice, and gallstones (PubMed, PMID: 30135146). Pharmacological agents often target these components to manage liver disease; for example, FXR agonists like obeticholic acid are used to reduce bile acid synthesis (NIH, 2023). Additionally, inhibitors of the Apical Sodium-dependent Bile Acid Transporter (ASBT) are employed to interrupt enterohepatic circulation and treat pruritus in cholestatic conditions (PubMed, PMID: 34143834). Monitoring these transporters is also critical in drug development to assess the risk of drug-induced liver injury (DILI) caused by the accumulation of toxic bile acids (FDA, 2022).

Other names

Hepatobiliary transport systemBile acid transport proteinsBiliary secretion pathway

Modulation of bile acid synthesis and transport via nuclear receptor activation or direct inhibition of transport proteins.