mGluR1, mGluR4, mGluR5, mGluR7

Metabotropic glutamate receptors (mGluRs) are Class C G protein-coupled receptors that respond to the neurotransmitter glutamate, the main excitatory transmitter in the CNS. They are divided into groups I, II, and III based on structure, pharmacology, and signal transduction, with mGluR1 and mGluR5 representing group I (mainly postsynaptic, excitatory), and mGluR4 and mGluR7 representing group III (mainly presynaptic, inhibitory). These receptors modulate neuronal excitability, synaptic plasticity, and neurotransmitter release, and are implicated in a range of brain disorders including Parkinson’s disease, epilepsy, schizophrenia, and chronic pain. Each receptor subtype is a potential therapeutic target, with both orthosteric and allosteric modulators under investigation as drugs.

Other names

mGluR1mGlu1mGluR4mGlu4mGluR5mGlu5mGluR7mGlu7metabotropic glutamate receptor type 1/4/5/7

Drugs act as orthosteric agonists or antagonists (bind the endogenous glutamate site), or as positive/negative allosteric modulators (bind to topographically distinct sites on the receptor affecting activity without directly blocking/activating the endogenous ligand site)