Identification of positive allosteric modulators VU0155094 (ML397) and VU0422288 (ML396) reveals new insights into the biology of metabotropic glutamate receptor 7.

Jalan-Sakrikar N, Field JR, Klar R, Mattmann ME, Gregory KJ, Zamorano R, Engers DW, Bollinger SR, Weaver CD, Days EL, Lewis LM, Utley TJ, Hurtado M, Rigault D, Acher F, Walker AG, Melancon BJ, Wood MR, Lindsley CW, Conn PJ, Xiang Z, Hopkins CR, Niswender CM
ACS Chem Neurosci. 2014 5 (12): 1221-37

PMID: 25225882 · PMCID: PMC4306484 · DOI:10.1021/cn500153z

Metabotropic glutamate receptor 7 (mGlu7) is a member of the group III mGlu receptors (mGlus), encompassed by mGlu4, mGlu6, mGlu7, and mGlu8. mGlu7 is highly expressed in the presynaptic active zones of both excitatory and inhibitory synapses, and activation of the receptor regulates the release of both glutamate and GABA. mGlu7 is thought to be a relevant therapeutic target for a number of neurological and psychiatric disorders, and polymorphisms in the GRM7 gene have been linked to autism, depression, ADHD, and schizophrenia. Here we report two new pan-group III mGlu positive allosteric modulators, VU0155094 and VU0422288, which show differential activity at the various group III mGlus. Additionally, both compounds show probe dependence when assessed in the presence of distinct orthosteric agonists. By pairing studies of these nonselective compounds with a synapse in the hippocampus that expresses only mGlu7, we have validated activity of these compounds in a native tissue setting. These studies provide proof-of-concept evidence that mGlu7 activity can be modulated by positive allosteric modulation, paving the way for future therapeutics development.

MeSH Terms (26)

Acetanilides Animals Benzoates Calcium CHO Cells Cricetulus Dose-Response Relationship, Drug Excitatory Amino Acid Agents Excitatory Postsynaptic Potentials Glutamic Acid Glycine G Protein-Coupled Inwardly-Rectifying Potassium Channels HEK293 Cells Hippocampus Humans In Vitro Techniques Male Mice, Inbred C57BL Picolinic Acids Propionates Pyrroles Rats Receptors, Metabotropic Glutamate Structure-Activity Relationship Thallium Transfection

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