Dopamine receptor D1 (D1R) is a key member of the G-protein coupled receptor (GPCR) family, involved in several physiological processes, including motor control, reward, learning, and memory. Dysregulation of D1R signaling is implicated in various neurological disorders, such as Parkinson's disease, schizophrenia, and drug addiction. Traditional methods for studying GPCRs may not fully capture the broad spectrum of signaling mechanisms that occur through specific receptors like D1R, which couple to adenylyl cyclase activity and intracellular cAMP production.

The Screen Quest™ Live Cell Dopamine Receptor D1 cAMP Assay Service Pack is designed for real-time, high-throughput monitoring of intracellular cAMP changes associated with D1R activation using transfected cell lines and Calbryte™ 520 wash-free calcium fluorescence detection methods. Unlike conventional assays that require cell lysis, this assay preserves cellular integrity, enabling both temporal and spatial resolution of specific signaling events associated with D1 receptors. This assay employs cell lines transfected to express D1R along with a promiscuous G-protein Gα16. The Gα16 protein allows D1R, which primarily signals through the cAMP pathway, to also couple to Gq signal transduction and mobilize intracellular calcium. Activation of D1R by specific ligands, such as dopamine, can be detected using calcium-sensitive dyes such as Calbryte™ 520 AM, Cal-520® AM, Fluo-8® AM, Fluo-4™ AM, or corresponding no-wash calcium kits. The inclusion of D1R and Gα16 co-expression ensures robust calcium signaling for reliable assay performance.

This service pack provides all necessary components for precise measurement of D1R-mediated cAMP changes using FLIPR, FDSS, or equivalent fluorescence microplate readers. It is an ideal tool for studying D1R signaling pathways and evaluating potential therapeutic compounds targeting this receptor, particularly in the context of neurological diseases, addiction research, and CNS-related disorders.