Abstract：
:The voltage-gated sodium channel isoform NaV1.7 is highly expressed in dorsal root ganglion neurons and is obligatory for nociceptive signal transmission. Genetic gain-of-function and loss-of-function NaV1.7 mutations have been identified in select individuals, and are associated with episodic extreme pain disorders and insensitivity to pain, respectively. These findings implicate NaV1.7 as a key pharmacotherapeutic target for the treatment of pain. While several small molecules targeting NaV1.7 have been advanced to clinical development, no NaV1.7-selective compound has shown convincing efficacy in clinical pain applications. Here we describe the discovery and characterization of ST-2262, a NaV1.7 inhibitor that blocks the extracellular vestibule of the channel with an IC50 of 72 nM and greater than 200-fold selectivity over off-target sodium channel isoforms, NaV1.1-1.6 and NaV1.8. In contrast to other NaV1.7 inhibitors that preferentially inhibit the inactivated state of the channel, ST-2262 is equipotent in a protocol that favors the resting state of the channel, a protocol that favors the inactivated state, and a high frequency protocol. In a non-human primate study, animals treated with ST-2262 exhibited reduced sensitivity to noxious heat. These findings establish the extracellular vestibule of the sodium channel as a viable receptor site for the design of selective ligands targeting NaV1.7.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Pajouhesh H,Beckley JT,Delwig A,Hajare HS,Luu G,Monteleone D,Zhou X,Ligutti J,Amagasu S,Moyer BD,Yeomans DC,Du Bois J,Mulcahy JVdoi
10.1038/s41598-020-71135-2subject
Has Abstractpub_date
2020-09-09 00:00:00pages
14791issue
1issn
2045-2322pii
10.1038/s41598-020-71135-2journal_volume
10pub_type
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