GNE-616 is a highly potent, metabolically stable, orally bioavailable, and subtype selective Nav1.7 inhibitor (Ki of 0.79 nM and Kd of 0.38 nM for hNav1.7) for the treatment of chronic pain. GNE-616 shows >1000 nM Kd and >2500-fold selectivity over hNav1.1, hNav1.3, hNav1.4, and hNav1.5. Selectivity over hNav1.2 and hNav1.6 is more modest at 31- and 73-fold, respectively[1]. Ki: 0.79 nM (hNav1.7)[1]Kd: 0.38 nM (hNav1.7), 12 nM (hNav1.2), 29 nM (hNav1.6)[1]
Site-directed mutagenesis is critical for the isoform selectivity profile of GNE-616 (hNav1.7, Kd: Y1537s/W1538=170±67 nM, V1541=3.9±1.1 nM, Y1537s/W1538/V1541=790±350 nM)[1].
GNE-616 shows robust activity in a Nav1.7-dependent inherited erythromelalgia (IEM) PK/PD model with an EC50 of 740 nM and EC50,u of 9.6 nM[1].
[1]. McKerrall SJ, et al. Structure- and Ligand-Based Discovery of Chromane Arylsulfonamide Nav1.7 Inhibitors for the Treatment of Chronic Pain. J Med Chem. 2019 Apr 25;62(8):4091-4109.