Pathways regulating bile secretion

Pathways regulating bile secretion represent the integrated physiological systems responsible for the synthesis, transport, and excretion of bile components from the liver into the gastrointestinal tract. This process is primarily driven by a suite of ATP-binding cassette (ABC) transporters, including the Bile Salt Export Pump (BSEP) and Multidrug Resistance-associated Protein 2 (MRP2), which move bile acids and organic anions across the canalicular membrane (KEGG: hsa04976). Regulation is largely mediated by nuclear receptors, most notably the Farnesoid X Receptor (FXR), which acts as a sensor for bile acid levels and coordinates the expression of genes involved in bile acid synthesis and transport (PubMed: 29915211). Dysfunction within these pathways can lead to cholestasis, a condition where bile flow is obstructed or impaired, resulting in the accumulation of toxic bile acids that cause hepatocyte damage, inflammation, and eventual cirrhosis (StatPearls: NBK470209). Therapeutic agents targeting these pathways include FXR agonists like obeticholic acid, which enhance bile flow, and ASBT inhibitors like odevixibat, which reduce the enterohepatic circulation of bile acids (PubMed: 34238688). Understanding these pathways is crucial for managing diseases such as primary biliary cholangitis and progressive familial intrahepatic cholestasis.

Other names

Bile secretion pathwayHepatobiliary transport systemBile acid transport and secretion

Modulation of bile acid transporters and nuclear receptors to enhance bile flow or reduce bile acid reabsorption.