VU 0357121

VU 0357121 is a positive and highly selective mGlu5R allosteric modulator (PAM) with an EC₅₀ of 33 nM. VU 0357121 is inactive or very weakly antagonizing at other mGlu receptor subtypes^[1]. In Vitro: VU 0357121 has the ability to enhance glutamate sensitivity of mGlu5 is likely due to the interaction at a site on the receptor distinct from the MPEP binding site. VU 0357121 does not bind at the MPEP allosteric site of mGlu5, thus does not possess mGlu5 NAM activity. The A809V/rmGlu5 mutation inhibited the ability of VU 0357121 to shift the glutamate concentration response curve, whereas the response to VU 0357121 is not altered by the F585I/rmGlu5 mutation. VU 0357121 shows weaker cooperativity in the Ca²⁺ mobilization assay in the low-expressing HEK293A-mGlu5 cell line^[1].