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.
[EN] PYRIDAZINONE DERIVATIVES AND USE THEREOF AS P2X7 RECEPTOR INHIBITORS [FR] DÉRIVÉS DE PYRIDAZINONE ET LEUR UTILISATION COMME INHIBITEURS DU RÉCEPTEUR P2X7
PYRIDAZINONE COMPOUNDS AND P2X7 RECEPTOR INHIBITORS
申请人:Shigeta Yukihiro
公开号:US20100286390A1
公开(公告)日:2010-11-11
Novel pyridazinone compounds of formula (I), which inhibit the purinergic P2X7 receptor and are useful for prevention, therapy and improvement of inflammatory and immunological diseases.
The invention relates to novel compounds of the general formula (A-I), with Het-2 being an optionally substituted bicyclic heteroaryl of the formula (AA) pharmaceutical compositions comprising them and the use thereof as medicaments, in particular for the use as ferroportin inhibitors, more particularly for the use in the prophylaxis and/or treatment of diseases caused by a lack of hepcidin or iron metabolism disorders, such as particularly iron overload states such as in particular thalassemia and hemochromatosis.