Glutamate receptor, metabotropic 5 (GRM5, mGluR5) is a member of Group I of the Metabotropic Glutamate Receptors and has been shown to activate phospholipase C. Alternative splice variants of GRM5 have been described, but their full-length nature has not been determined. Inflammation results in the activation of mGluR1 and mGluR5 in dorsal horn neurons of the spinal cord, leading to extracellular signal-regulated kinase (ERK) activation, which is required for nociceptive plasticity and enhanced pain. GRM5 is involved in inflammatory mechanical hyperalgesia and potentially in schizophrenia. Summary of expresson: GRM5 has been reported to be expressed in various regions of the brain as well as in the spinal cord and dorsal root ganglia. References: The UniProt Consortium. Nucleic Acids Res. 47: D506-515 (2019); Nucleic Acids Res. 2016 Jan 4;44(D1):D733-45, PMID:26553804