Potent mGlu5 positive allosteric modulator (EC50 = 1.5 nM) and agonist (EC50 = 171 nM; maximum effect is 65% that of glutamate). Binds allosteric site with high affinity (Ki = 11.8 nM). Increases maximum response to glutamate by 30%. Exhibits bias towards signaling via IP1 and ERK1/2 over iCa2+ in HEK293 and neuronal cells, and activates Gs in HEK 293 cells. Induces epileptiform activity in CA3 hippocampal neurons in vitro and convulsions in vivo.
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