HZ-166 (HZ166) is a GABAA receptor subtype-selective benzodiazepine site ligand with preferential activity at α2- and α3-GABA(A) receptors.
HZ-166 displays a statistically significant higher affinity for receptors not containing the α1 subunit with a rank order of α5 (Ki=140nM) > α2 (Ki=269 nM) > α1 (Ki=382 nM).
The Ki value of HZ166 for the α3β3γ2 combination (185± 47 nM) was statistically significantly lower than the Ki value observed for α1β3γ2 but not different from those of α2β3γ2 and α5β3γ2.
HZ-166 is antihyperalgesic in mouse models of inflammatory and neuropathic pain.
