Neurotensin receptor 1 (NTS1) is one of three receptors that mediate the effects of the tridecapeptide neurotensin. Neurotensin is synthesized and secreted from neurons in the central neural system (CNS) and from endocrine cells in the gastrointestinal tract.NTS1 signals preferentially through Gaq, resulting in the activation phopholipase C and intracellular Ca2+ mobilization, although coupling with Gi/o and to Gs has been observed in some expression systems
