Discovery and biological evaluation of potent, selective, orally bioavailable, pyrazine-based blockers of the Nav1.8 sodium channel with efficacy in a model of neuropathic pain
摘要:
Na(v)1.8 (also known as PN3) is a tetrodotoxin-resistant (TTx-r) voltage-gated sodium channel (VGSC) that is highly expressed on small diameter sensory neurons. It has been implicated in the pathophysiology of inflammatory and neuropathic pain, and we envisioned that selective blockade of Na(v)1.8 would be analgesic, while reducing adverse events typically associated with non-selective VGSC blocking therapeutic agents. Herein, we describe the preparation and characterization of a series of 6-aryl-2-pyrazinecarboxamides, which are potent blockers of the human Na(v)1.8 channel and also block TTx-r sodium currents in rat dorsal root ganglia (DRG) neurons. Selected derivatives display selectivity versus human Na(v)1.2. We further demonstrate that an example from this series is orally bioavailable and produces antinociceptive activity in vivo in a rodent model of neuropathic pain following oral administration. (C) 2010 Elsevier Ltd. All rights reserved.
Discovery and biological evaluation of potent, selective, orally bioavailable, pyrazine-based blockers of the Nav1.8 sodium channel with efficacy in a model of neuropathic pain
摘要:
Na(v)1.8 (also known as PN3) is a tetrodotoxin-resistant (TTx-r) voltage-gated sodium channel (VGSC) that is highly expressed on small diameter sensory neurons. It has been implicated in the pathophysiology of inflammatory and neuropathic pain, and we envisioned that selective blockade of Na(v)1.8 would be analgesic, while reducing adverse events typically associated with non-selective VGSC blocking therapeutic agents. Herein, we describe the preparation and characterization of a series of 6-aryl-2-pyrazinecarboxamides, which are potent blockers of the human Na(v)1.8 channel and also block TTx-r sodium currents in rat dorsal root ganglia (DRG) neurons. Selected derivatives display selectivity versus human Na(v)1.2. We further demonstrate that an example from this series is orally bioavailable and produces antinociceptive activity in vivo in a rodent model of neuropathic pain following oral administration. (C) 2010 Elsevier Ltd. All rights reserved.
Subtype-selective Nav1.8 sodium channel blockers: Identification of potent, orally active nicotinamide derivatives
作者:Michael E. Kort、Robert N. Atkinson、James B. Thomas、Irene Drizin、Matthew S. Johnson、Matthew A. Secrest、Robert J. Gregg、Marc J.C. Scanio、Lei Shi、Ahmed H. Hakeem、Mark A. Matulenko、Mark L. Chapman、Michael J. Krambis、Dong Liu、Char-Chang Shieh、XuFeng Zhang、Gricelda Simler、Joseph P. Mikusa、Chengmin Zhong、Shailen Joshi、Prisca Honore、Rosemarie Roeloffs、Stephen Werness、Brett Antonio、Kennan C. Marsh、Connie R. Faltynek、Douglas S. Krafte、Michael F. Jarvis、Brian E. Marron
DOI:10.1016/j.bmcl.2010.08.121
日期:2010.11
A series of aryl-substituted nicotinamide derivatives with selective inhibitory activity against the Na(v)1.8 sodium channel is reported. Replacement of the furan nucleus and homologation of the anilide linker in subtype-selective blocker A-803467 (1) provided potent, selective derivatives with improved aqueous solubility and oral bioavailability. Representative compounds from this series displayed efficacy in rat models of inflammatory and neuropathic pain. (C) 2010 Elsevier Ltd. All rights reserved.
Discovery and biological evaluation of potent, selective, orally bioavailable, pyrazine-based blockers of the Nav1.8 sodium channel with efficacy in a model of neuropathic pain
作者:Marc J.C. Scanio、Lei Shi、Irene Drizin、Robert J. Gregg、Robert N. Atkinson、James B. Thomas、Matthew S. Johnson、Mark L. Chapman、Dong Liu、Michael J. Krambis
DOI:10.1016/j.bmc.2010.09.057
日期:2010.11.15
Na(v)1.8 (also known as PN3) is a tetrodotoxin-resistant (TTx-r) voltage-gated sodium channel (VGSC) that is highly expressed on small diameter sensory neurons. It has been implicated in the pathophysiology of inflammatory and neuropathic pain, and we envisioned that selective blockade of Na(v)1.8 would be analgesic, while reducing adverse events typically associated with non-selective VGSC blocking therapeutic agents. Herein, we describe the preparation and characterization of a series of 6-aryl-2-pyrazinecarboxamides, which are potent blockers of the human Na(v)1.8 channel and also block TTx-r sodium currents in rat dorsal root ganglia (DRG) neurons. Selected derivatives display selectivity versus human Na(v)1.2. We further demonstrate that an example from this series is orally bioavailable and produces antinociceptive activity in vivo in a rodent model of neuropathic pain following oral administration. (C) 2010 Elsevier Ltd. All rights reserved.