RESUMO
N-Methyl-d-aspartate receptors (NMDARs) are glutamate-gated Na+ and Ca2+-permeable ion channels involved in excitatory synaptic transmission and synaptic plasticity. NMDAR hypofunction has long been implicated in the pathophysiology including major depressive disorders (MDDs). Herein, we report a series of furan-2-carboxamide analogues as novel NMDAR-positive allosteric modulators (PAMs). Through structure-based virtual screen and electrophysiological tests, FS2921 was identified as a novel NMDAR PAM with potential antidepressant effects. Further structure-activity relationship studies led to the discovery of novel analogues with increased potentiation. Compound 32h caused a significant increase in NMDAR excitability in vitro and impressive activity in the forced swimming test. Moreover, compound 32h showed no significant inhibition of hERG or cell viability and possessed a favorable PK/PD profile. Our study presented a series of novel NMDAR PAMs and provided potential opportunities for discovering of new antidepressants.
Assuntos
Antidepressivos/química , Transtorno Depressivo Maior/tratamento farmacológico , Receptores de N-Metil-D-Aspartato/metabolismo , Potenciais de Ação/efeitos dos fármacos , Regulação Alostérica/efeitos dos fármacos , Animais , Antidepressivos/metabolismo , Antidepressivos/farmacologia , Antidepressivos/uso terapêutico , Sítios de Ligação , Sobrevivência Celular/efeitos dos fármacos , Modelos Animais de Doenças , Avaliação Pré-Clínica de Medicamentos , Furanos/química , Furanos/metabolismo , Furanos/farmacologia , Furanos/uso terapêutico , Meia-Vida , Humanos , Aprendizagem em Labirinto/efeitos dos fármacos , Camundongos , Camundongos Endogâmicos ICR , Simulação de Acoplamento Molecular , Neurônios/citologia , Neurônios/efeitos dos fármacos , Neurônios/metabolismo , Ratos , Receptores de N-Metil-D-Aspartato/química , Receptores de N-Metil-D-Aspartato/genética , Relação Estrutura-AtividadeRESUMO
By use of the 6-hydroxypyridazinone framework, a new series of potent σ1 receptor ligands associated with pharmacological antineuropathic pain activity was synthesized and is described in this article. In vitro receptor binding studies revealed high σ1 receptor affinity (Ki σ1 = 1.4 nM) and excellent selectivity over not only σ2 receptor (1366-fold) but also other CNS targets (adrenergic, µ-opioid, sertonerigic receptors, etc.) for 2-(3,4-dichlorophenyl)-6-(3-(piperidin-1-yl)propoxy)pyridazin-3(2H)-one (compound 54). Compound 54 exhibited dose-dependent antiallodynic properties in mouse formalin model and rats chronic constriction injury (CCI) model of neuropathic pain. In addition, functional activity of compound 54 was evaluated using phenytoin and indicated that the compound was a σ1 receptor antagonist. Moreover, no motor impairments were found in rotarod tests at antiallodynic doses and no sedative side effect was evident in locomotor activity tests. Last but not least, good safety and favorable pharmacokinetic properties were also noted. These profiles suggest that compound 54 may be a member of a novel class of candidate drugs for treatment of neuropathic pain.