mGluR7

mGluR7 is a presynaptic group III metabotropic glutamate receptor localized at the active zone, where it acts as an autoreceptor that inhibits neurotransmitter release^[1]. Mechanistically, group III mGluRs, including mGluR4, mGluR6, mGluR7, and mGluR8, inhibit adenylate cyclase, distinguishing them from group I receptors that activate phospholipase C^[2]. In synaptic models, mGluR7-like receptors reduced NMDA-induced excitotoxicity by inhibiting glutamate release, supporting their use in studies of glutamate toxicity and neuronal death^[3]. In disease-relevant models, AMN082, an mGluR7 allosteric agonist, modulated nucleus accumbens GABA and glutamate without changing dopamine, linking mGluR7 to addiction-related neurotransmission^[4]. Compared with related isoforms, mGluR7 differs from mGluR8 because both splice variants shared similar pharmacology, but mGluR8 showed higher agonist potency than mGluR7^[5]. At inner hair-cell ribbon synapses, mGluR7a and mGluR7b showed presynaptic localization and may form receptor complexes with mGluR4 and mGluR8b^[6]. For experimental applications, XAP044 blocked mGluR7 through the Venus flytrap domain and inhibited amygdala LTP, stress, and anxiety-related behavior^[7].