About Human Pituitary Adenylate Cyclase-Activating Polypeptide Type I Receptor (PAC1R/ADCYAP1R1) Stable Cell Line

Pituitary Adenylate Cyclase-Activating Polypeptide Type I Receptor (PAC1R), encoded by the ADCYAP1R1 gene, is a Class B G protein-coupled receptor (GPCR) that serves as the primary receptor for pituitary adenylate cyclase-activating polypeptide (PACAP). PAC1R exhibits high affinity and selectivity for PACAP peptides, particularly PACAP38 and PACAP27, and plays critical roles in neuroendocrine regulation, neurotransmission, neuroprotection, and cellular stress responses. Upon ligand binding, PAC1R can couple to both Gs and Gq proteins, leading to activation of adenylate cyclase, elevation of intracellular cAMP levels, calcium mobilization, and activation of multiple downstream signaling pathways including PKA, PKC, ERK/MAPK, and CREB-mediated transcriptional responses.

PAC1R is widely expressed throughout the central and peripheral nervous systems, endocrine organs, immune cells, and cardiovascular tissues. The PACAP-PAC1R signaling axis regulates numerous physiological processes including neuronal survival, learning and memory, circadian rhythm regulation, hormone secretion, stress adaptation, pain signaling, and inflammatory responses. Dysregulation of PAC1R signaling has been implicated in migraine, anxiety disorders, post-traumatic stress disorder (PTSD), neurodegenerative diseases, chronic pain syndromes, and inflammatory disorders. As a result, PAC1R has emerged as an important therapeutic target in neuroscience and neuropsychiatric drug discovery.

eEnzyme's Human PAC1R Stable Cell Line provides a reliable and reproducible cellular platform for investigating PAC1R-mediated signaling pathways and evaluating receptor-targeted therapeutics. The cell line enables quantitative assessment of PACAP analogs, agonists, antagonists, antibodies, and novel modulators through cAMP assays, calcium mobilization 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 neuroscience and neuroendocrine research.

Applications of the PAC1R Stable Cell Line

• PAC1R receptor pharmacology studies
• PACAP signaling investigations
• Agonist and antagonist screening
• Migraine and headache research
• Neuroprotection and neurodegeneration studies
• Anxiety and stress-related disorder research
• cAMP and calcium signaling assays
• High-throughput screening applications

Biological Significance of PAC1R

PAC1R is a key mediator of PACAP-dependent signaling and plays essential roles in maintaining neuronal function, neuroendocrine regulation, and cellular homeostasis. Activation of PAC1R promotes neuronal survival, regulates neurotransmitter release, and supports adaptive responses to physiological and environmental stress. In the nervous system, PAC1R signaling contributes to learning, memory, circadian rhythm regulation, pain perception, and emotional processing. Recent genetic and clinical studies have identified the PACAP-PAC1R pathway as an important contributor to migraine pathophysiology and stress-related psychiatric disorders, making it a highly attractive therapeutic target. Because of its involvement in neuroprotection, neuroinflammation, endocrine regulation, and neurological disease, PAC1R remains an important focus of translational research and GPCR-targeted drug discovery. The PAC1R Stable Cell Line provides a valuable tool for studying receptor biology and accelerating the development of next-generation therapeutics targeting neurological and neuroendocrine disorders.