Imidazol-1-ylethylindazole voltage-gated sodium channel ligands are neuroprotective during optic neuritis in a mouse model of multiple sclerosis.

A series of imidazol-1-ylethylindazole sodium channel ligands were developed and optimized for sodium channel inhibition and in vitro neuroprotective activity. The molecules exhibited displacement of a radiolabeled sodium channel ligand and selectivity for blockade of the inactivated state of cloned neuronal Nav channels. Metabolically stable analogue 6 was able to protect retinal ganglion cells during optic neuritis in a mouse model of multiple sclerosis.

Lesional-targeting of neuroprotection to the inflammatory penumbra in experimental multiple sclerosis.

Progressive multiple sclerosis is associated with metabolic failure of the axon and excitotoxicity that leads to chronic neurodegeneration. Global sodium-channel blockade causes side effects that can limit its use for neuroprotection in multiple sclerosis. Through selective targeting of drugs to lesions we aimed to improve the potential therapeutic window for treatment.

Oxadiazolylindazole sodium channel modulators are neuroprotective toward hippocampal neurones.

We report the discovery of a new class of neuroprotective voltage-dependent sodium channel modulators exemplified by (5-(1-benzyl-1H-indazol-3-yl)-1,2,4-oxadiazol-3-yl)methanamine 11 (CFM1178). The compounds were inhibitors of [(14)C]guanidinium ion flux in rat forebrain synaptosomes and displaced binding of the sodium channel ligand [(3)H]BW202W92. 11 and the corresponding N(2)-benzyl isomer, 38 (CFM6058), demonstrated neuroprotective activity in hippocampal slices comparable to sipatrigine.