IC-87201

A small molecule inhibitor of PSD-95/nNOS interaction with IC50 of 31 uM, without inhibiting nNOS catalytic activity; dose-dependently blocks NMDA-induced increase in cGMP production in hippocampal cultures with IC50 of 2.7 uM; inhibits NMDA-induced thermal hyperalgesia in mice with no effect on acute pain thresholds or motor coordination, also reverses mechanical allodynia induced by chronic constriction of the sciatic nerve. (In Vitro) :IC87201 (500-1800 μM) does not inhibit any of the probe-PDZ interactions involving PDZ1, PDZ2, PDZ3 of PSD-95 or nNOS-PDZ, or bind the canonical PDZ ligand binding sites. IC87201 binds to the β-finger of nNOS-PDZ and allosterically inhibits the nNOS-PDZ/PSD-95-PDZ interactions. IC87201 shows high degree of fluorescence-based artefactual signal when using TAMRA-nNOS as probe. IC87201 (20 μM) suppresses NMDA-stimulated cGMP formation relative to vehicle, in cultured hippocampal neurons. IC87201 (10 and 100 nM) attenuats NMDA/glycine-induced decreases in neurite outgrowth. IC87201 dose-dependently reduces NMDA-induced cGMP production in primary hippocampal neurons (DIV 14-21) with an IC50 of 2.7 μM. IC87201 increases the number of branches at 10-30 μM when compared to control-treated neurons. (In Vivo) :IC87201 (1, 4 and 10 mg/kg, i.p.) does not produce impairment in either spatial working memory or source memory. IC87201 (1 mg/kg) is effective in treating NMDA-induced thermal hyperalgesia in mice, with a corresponding peak plasma level of 55 ng/mL (or 0.2 μM) .