Isoxazolo[3,4-d]pyridazinones positively modulate the metabotropic glutamate subtypes 2 and 4

Isoxazolo[3,4-d] pyridazinones ([3,4-d]s) are selective positive modulators of the metabotropic glutamate receptors (mGluRs) subtypes 2 and 4, with no functional cross reactivity at mGluR _1a , mGLuR ₅ or mGluR ₈ . Modest binding for two of the [3,4-d]s is observed at the allosteric fenobam mGluR ₅ site, but not sufficient to translate into a functional effect. The structure activity relationship (SAR) for mGluR ₂ and mGluR ₄ are distinct: the compounds which select for mGluR ₂ all contain fluorine on the N-6 aryl group. Furthermore, the [3,4-d]s in this study showed no significant binding at inhibitory GABA _A nor excitatory NMDA receptors, and previously we had disclosed that they lack significant activity at the System Xc-Antiporter. A homology model based on Conn's mGluR ₁ crystal structure was examined, and suggested explanations for a preference for allosteric over orthosteric binding, subtype selectivity, and suggested avenues for optimization of efficacy as a reasonable working hypothesis.