About Human G Protein-Coupled Bile Acid Receptor 1 (GPBAR1/TGR5) Stable Cell Line

G Protein-Coupled Bile Acid Receptor 1 (GPBAR1), commonly known as TGR5, is a Class A G protein-coupled receptor (GPCR) that functions as a membrane receptor for bile acids. Unlike the nuclear bile acid receptor FXR, TGR5 mediates rapid, non-genomic bile acid signaling and is activated by a variety of endogenous bile acids, including lithocholic acid (LCA), deoxycholic acid (DCA), chenodeoxycholic acid (CDCA), and their derivatives. Upon activation, GPBAR1 primarily couples to Gs proteins, stimulating adenylate cyclase activity and increasing intracellular cAMP levels, which regulate downstream pathways involved in metabolism, inflammation, energy expenditure, and endocrine function.

GPBAR1 is widely expressed in the gastrointestinal tract, liver, gallbladder, adipose tissue, skeletal muscle, immune cells, endothelial cells, and the central nervous system. The receptor plays critical roles in maintaining metabolic homeostasis by regulating glucose metabolism, insulin sensitivity, energy expenditure, bile acid physiology, and inflammatory responses. Activation of GPBAR1 in intestinal enteroendocrine cells stimulates secretion of glucagon-like peptide-1 (GLP-1), enhancing insulin release and glucose control. In immune cells, TGR5 signaling suppresses pro-inflammatory cytokine production and promotes anti-inflammatory responses. Dysregulation of GPBAR1 signaling has been implicated in obesity, type 2 diabetes, nonalcoholic steatohepatitis (NASH), inflammatory bowel disease, liver disease, and metabolic syndrome.

eEnzyme's Human GPBAR1 Stable Cell Line provides a reliable and reproducible cellular platform for investigating TGR5-mediated signaling pathways and evaluating receptor-targeted therapeutics. The cell line enables quantitative assessment of bile acids, synthetic agonists, antagonists, and novel receptor modulators through cAMP assays, reporter gene assays, and other GPCR functional screening platforms. Researchers can utilize this stable cell line for receptor characterization, ligand profiling, potency determination, lead optimization, and high-throughput screening applications supporting metabolic disease, inflammation, and gastrointestinal drug discovery programs.

Applications of the GPBAR1 Stable Cell Line

• GPBAR1 (TGR5) receptor pharmacology studies
• Bile acid signaling investigations
• Agonist and antagonist screening
• Metabolic disease and obesity research
• Type 2 diabetes drug discovery
• Inflammation and immunology studies
• cAMP and GPCR functional assays
• High-throughput screening applications

Biological Significance of GPBAR1

GPBAR1 is a key mediator of bile acid signaling and serves as an important link between nutrient metabolism, endocrine regulation, and immune function. Activation of TGR5 stimulates cAMP-dependent pathways that enhance GLP-1 secretion, improve glucose homeostasis, increase energy expenditure, and regulate lipid metabolism. In macrophages and other immune cells, GPBAR1 activation suppresses inflammatory signaling pathways and contributes to tissue protection and immune homeostasis. These diverse biological functions have made TGR5 an attractive therapeutic target for obesity, diabetes, NASH, inflammatory disorders, and cardiovascular disease. Ongoing research continues to explore the role of GPBAR1 in gut-liver communication, microbiome-mediated signaling, and metabolic regulation. Because of its broad physiological significance and therapeutic potential, GPBAR1 remains an important target in metabolic disease research and GPCR-focused drug discovery. The GPBAR1 Stable Cell Line provides a valuable tool for studying bile acid receptor biology and advancing the development of next-generation therapeutics targeting metabolic and inflammatory disorders.