Neuromedin U (NMU) is a highly conserved, ubiquitously distributed neuropeptide, which regulates food intake and body weight. Two high-affinity receptors have been identified for NMU: Neuromedin U receptor 1(NMUR1) and Neuromedin U receptor 2 (NMUR2) that belong to the G-protein coupled receptors (GPCRs). These receptors are members of the rhodopsin-like class A G-protein coupled receptors family and share about 50% identity with each other in the seven transmembrane region.nNMUR2 is highly expressed in the central nervous system, in the paraventricular nucleus of the hypothalamus, nuclei accumbens, hippocampus, thalamus, medulla oblongata, and spinal cord. It is also detected in organs such as the uterus and ovary, and is abundant in nociceptive sensory pathways, including spinal dorsal horn, dorsal root ganglia, thalamus, and brain stem.