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1,3,5-Trisubstituted Pyrazoles as Potent Negative Allosteric Modulators of the mGlu 2/3 Receptors.
ChemMedChem 2017 June 22
The metabotropic glutamate subtype 2 (mGlu2 ) receptor is a presynaptic membrane receptor distributed widely in brain that provides feedback inhibitory control of glutamate release. Inhibition of the mGlu2 receptor function with a negative allosteric modulator (NAM) enhances activity-dependent glutamate release, which may be of therapeutic benefit for the treatment of neurological and psychiatric disorders. An attractive pyrazole hit was identified after a high-throughput screening (HTS) campaign. The evolution of this hit is described by structure-activity relationship (SAR) studies on specific parts of the molecule. From near micromolar potency we could obtain compounds with single-digit nanomolar activity in the mGlu2 NAM GTPγS assay. In addition to SAR on in vitro potency, a more detailed overview is given with a specific set of compounds on the excellent agreement between in vitro potency, free brain concentration, and ex vivo mGlu2 receptor occupancy. Finally, to obtain improved drug-like compounds, plans for future research are suggested toward increasing free brain concentration while maintaining high in vitro potency.
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