Bile Secretion System

The "bile secretion system" is not a single molecule or traditional drug target, but rather a physiological process involving the coordinated action of many transporters, enzymes, channels, and cell types in the liver (hepatocytes and cholangiocytes) and biliary tract. Bile secretion refers to the formation, modification, and excretion of bile, a fluid essential for lipid digestion, absorption, and the excretion of waste such as bilirubin and cholesterol. Molecular components include multiple membrane transport proteins (such as BSEP/ABCB11, MDR3/ABCB4, MRP2/ABCC2, NTCP/SLC10A1, ASBT/SLC10A2, OATPs/SLCOs, as well as aquaporins and various ion channels and exchangers)[1][2][4]. Bile secretion is regulated by neural, hormonal, and local factors, and disruption of any component can contribute to liver and biliary diseases. It is not appropriate to consider "bile secretion system" as a canonical target molecule; instead, individual constituent proteins (e.g., Bile salt export pump, Multidrug resistance–associated protein 2) are recognized drug targets and biomarkers in hepatology and pharmacology[1][2][4].

Modulation of bile salt composition or pool, alteration of bile acid synthesis or reabsorption, stimulation or inhibition of bile secretion