G protein-coupled Bile Acid Receptor 1 (胆汁酸受体)

G protein-coupled bile acid receptor 1 (GPCR19, TGR5, GPBAR1) is a plasma membrane-bound, G protein-coupled receptor that has bile acids as its ligand. GPCR19 is a regulator of energy homeostasis, bile acid homeostasis as well as glucose metabolism. GPCR19 transduces extracellular signals through heterotrimeric G proteins.

GPCR19 can be activated by bile acids and then it induces cAMP production. As a membrane receptor, GPCR19 can be internalized into the cytoplasm in response to its ligands. GPCR19 plays important roles in cell signaling pathways such as nuclear factor κB (NF-κB), AKT, and extracellular signal-regulated kinases (ERK). Its agonists may be potential drugs for the treatment of metabolic, inflammation, and digestive disorders. In addition, GPCR19 stimulates glucagon-like peptide 1 (GLP-1) secretion. It also has become an attractive therapeutic target for the prevention and/or the treatment of obesity and its highly associated Type II diabetes and metabolic syndrome.