RESUMEN
DDD-028 (4), a novel pentacyclic pyridoindolobenzazepine derivative was evaluated in vitro for receptor binding affinity and in vivo for analgesic activity using rodent models of neuropathic and inflammatory pain. DDD-028 does not bind to opioid, cannabinoid, dopamine, or histamine receptors. DDD-028 is very active even at the low oral dose of 1-5 mg/kg in both neuropathic, (spinal nerve ligation and chronic constriction injury) and inflammatory (Complete Freund's Adjuvant Induced) models of pain. DDD-028 appears to be about 6-fold more potent than pregabalin and indomethacin. Visual observation of all the animals used in these studies indicated that DDD-028 is well tolerated without any sedation. Thus, DDD-028 seems to be a promising candidate for the treatment of neuropathic and inflammatory pain without the possible side effects or abuse potential associated with opioid or cannabinoid activities.
Asunto(s)
Analgésicos/uso terapéutico , Antiinflamatorios no Esteroideos/uso terapéutico , Azepinas/farmacología , Carbolinas/farmacología , Constricción Patológica/tratamiento farmacológico , Inflamación/tratamiento farmacológico , Neuralgia/tratamiento farmacológico , Nervios Espinales/efectos de los fármacos , Analgésicos/administración & dosificación , Analgésicos/química , Animales , Antiinflamatorios no Esteroideos/administración & dosificación , Antiinflamatorios no Esteroideos/química , Azepinas/administración & dosificación , Azepinas/química , Carbolinas/administración & dosificación , Carbolinas/química , Enfermedad Crónica , Ratones , Estructura Molecular , Dimensión del Dolor , Ratas , Nervios Espinales/patologíaRESUMEN
Systematic optimisation of a poorly soluble lead series of isoxazole-3-carboxamides was conducted. Substitution of the 4-position with specific polar functionality afforded the requisite balance of potency, solubility and physicochemical properties. Compound 21a was found to be efficacious in the rat Capsaicin Hargreaves assay following oral administration.
Asunto(s)
Ciclohexanoles/química , Isoxazoles/química , Canales Catiónicos TRPV/antagonistas & inhibidores , Administración Oral , Amidas/química , Amidas/farmacocinética , Amidas/uso terapéutico , Animales , Capsaicina/toxicidad , Ciclohexanoles/farmacocinética , Ciclohexanoles/uso terapéutico , Modelos Animales de Enfermedad , Evaluación Preclínica de Medicamentos , Humanos , Hiperalgesia/inducido químicamente , Hiperalgesia/tratamiento farmacológico , Isoxazoles/farmacocinética , Isoxazoles/uso terapéutico , Microsomas Hepáticos/metabolismo , Ratas , Relación Estructura-Actividad , Canales Catiónicos TRPV/metabolismoRESUMEN
Optimization of a water soluble, moderately potent lead series of isoxazole-3-carboxamides was conducted, affording a compound with the requisite balance of potency, solubility and physicochemical properties for in vivo use. Compound 8e was demonstrated to be efficacious in a rat model of inflammatory pain, following oral administration.
Asunto(s)
Isoxazoles/química , Canales Catiónicos TRPV/antagonistas & inhibidores , Administración Oral , Amidas/síntesis química , Amidas/química , Amidas/uso terapéutico , Animales , Modelos Animales de Enfermedad , Humanos , Isoxazoles/síntesis química , Isoxazoles/uso terapéutico , Dolor/tratamiento farmacológico , Ratas , Canales Catiónicos TRPV/metabolismoRESUMEN
Optimisation of a screening hit incorporating both TRPV1 activity and solubility was conducted. Substitution of the isoxazole-3-carboxamide with the bespoke 1S, 3R-3-aminocyclohexanol motif afforded the requisite balance of potency and solubility. Compounds 32 and 40 were found to have antihyperalgesic effects in the rat CFA Hg assay and induce a mechanism based hyperthermia.