About Human Prostaglandin E Receptor 4 (EP4R/PTGER4) Stable Cell Line

Prostaglandin E Receptor 4 (EP4R), also known as PTGER4, is a Class A G protein-coupled receptor (GPCR) that serves as one of the four receptors for prostaglandin E2 (PGE2), a key lipid mediator involved in inflammation, immune regulation, pain signaling, tissue repair, and cancer progression. EP4R is widely expressed in immune cells, epithelial tissues, endothelial cells, bone, gastrointestinal tissues, and various tumor types. Upon activation by PGE2, EP4R primarily couples to Gs proteins, stimulating adenylate cyclase activity and increasing intracellular cAMP levels, which subsequently regulate numerous downstream signaling pathways including PKA, PI3K/Akt, ERK/MAPK, and β-arrestin-mediated signaling.

EP4R plays critical roles in modulating inflammatory responses, immune cell function, vascular biology, bone remodeling, and tumor microenvironment regulation. Dysregulated EP4 signaling has been implicated in chronic inflammatory diseases, autoimmune disorders, pain, fibrosis, cardiovascular disease, and multiple forms of cancer. In oncology, EP4R activation contributes to tumor growth, angiogenesis, metastasis, and immune evasion, making it an attractive therapeutic target for cancer immunotherapy. Consequently, EP4R has become a major focus of pharmaceutical research and drug discovery programs targeting inflammatory and oncological diseases.

eEnzyme's Human EP4R Stable Cell Line provides a reliable and reproducible cellular platform for investigating EP4 receptor pharmacology and signaling mechanisms. The cell line enables quantitative evaluation of agonists, antagonists, inverse agonists, and allosteric modulators through cAMP assays, reporter gene assays, and other GPCR functional screening platforms. Researchers can utilize this stable cell line for receptor characterization, compound potency determination, lead optimization, and high-throughput screening applications supporting inflammation, immunology, and cancer drug discovery programs.

Applications of the EP4R Stable Cell Line

• EP4 receptor pharmacology studies
• Prostaglandin E2 signaling investigations
• Agonist and antagonist screening
• Inflammation and immunology research
• Cancer biology and immuno-oncology studies
• cAMP and GPCR signaling assays
• Drug discovery and lead optimization programs
• High-throughput screening applications

Biological Significance of EP4R

EP4R is a major mediator of prostaglandin E2 signaling and regulates a broad range of physiological and pathological processes. Activation of EP4R stimulates cAMP-dependent signaling pathways that influence immune cell activation, cytokine production, vascular function, epithelial barrier integrity, and tissue repair. In inflammatory diseases, EP4R can exert both pro-inflammatory and anti-inflammatory effects depending on the cellular context. In cancer, elevated PGE2-EP4 signaling promotes tumor growth, angiogenesis, metastasis, and suppression of anti-tumor immune responses. As a result, EP4 antagonists are actively being investigated as novel therapeutics for cancer and chronic inflammatory diseases. Because of its central role in prostaglandin biology, immune regulation, and tumor progression, EP4R remains one of the most important prostaglandin receptors in translational research and GPCR-targeted drug discovery. The EP4R Stable Cell Line provides a valuable tool for studying receptor function and advancing the development of next-generation EP4-targeted therapeutics.