Abstract
G protein-coupled receptors that activate Gq/11 regulate a range of physiological processes including neurotransmission, energy homeostasis, blood pressure regulation, and calcium homeostasis. Activation of Gq/11-coupled receptors stimulates the generation of inositol 1,4,5-trisphosphate (IP3), which mobilizes intracellular calcium release from the endoplasmic reticulum. This chapter describes an assay that uses a NanoBiT-IP3 luminescent biosensor to detect increases in IP3 in live cells. It describes how to perform these assays to assess signaling by the ghrelin receptor and the calcium-sensing receptor in HEK293 cells.
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