RESUMEN
The synthesis of a novel series of 1,4-dihydroindeno[1,2-c]pyrazoles with acetylene-type side chains is described. Optimization of those compounds as KDR kinase inhibitors identified 8, which displayed an oral activity in an estradiol-induced murine uterine edema model (ED50 = 3 mg/kg) superior to Sutent (ED50 = 9 mg/kg) and showed potent antitumor efficacy in an MX-1 human breast carcinoma xenograft tumor growth model (tumor growth inhibition = 90% at 25 mg/kg.day po). The compound was docked into a homology model of the homo-tetrameric pore domain of the hERG potassium channel to identify strategies to improve its cardiac safety profile. Systematic interruption of key binding interactions between 8 and Phe656, Tyr652, and Ser624 yielded 90, which only showed an IC50 of 11.6 microM in the hERG patch clamp assay. The selectivity profile for 8 and 90 revealed that both compounds are multitargeted receptor tyrosine kinase inhibitors with low nanomolar potencies against the members of the VEGFR and PDGFR kinase subfamilies.
Asunto(s)
Alquinos/síntesis química , Antineoplásicos/síntesis química , Canales de Potasio Éter-A-Go-Go/efectos de los fármacos , Indenos/síntesis química , Pirazoles/síntesis química , Receptores del Factor de Crecimiento Derivado de Plaquetas/antagonistas & inhibidores , Receptores de Factores de Crecimiento Endotelial Vascular/antagonistas & inhibidores , Tiofenos/síntesis química , Alquinos/efectos adversos , Alquinos/farmacología , Animales , Antineoplásicos/efectos adversos , Antineoplásicos/farmacología , Unión Competitiva , Línea Celular , Canal de Potasio ERG1 , Edema/inducido químicamente , Edema/tratamiento farmacológico , Estradiol , Canales de Potasio Éter-A-Go-Go/fisiología , Femenino , Humanos , Indenos/efectos adversos , Indenos/farmacología , Ratones , Ratones Endogámicos BALB C , Modelos Moleculares , Técnicas de Placa-Clamp , Unión Proteica , Pirazoles/efectos adversos , Pirazoles/metabolismo , Pirazoles/farmacología , Ensayo de Unión Radioligante , Estereoisomerismo , Relación Estructura-Actividad , Tiofenos/metabolismo , Tiofenos/farmacología , Enfermedades Uterinas/inducido químicamente , Enfermedades Uterinas/tratamiento farmacológico , Receptor 2 de Factores de Crecimiento Endotelial Vascular/antagonistas & inhibidores , Ensayos Antitumor por Modelo de XenoinjertoRESUMEN
A series of 1,4-dihydroindeno[1,2-c]pyrazoles with a 3-thiophene substituent carrying a urea-type side chain were identified as potent multitargeted (VEGFR and PDGFR families) receptor tyrosine kinase inhibitors. A KDR homology model suggested that the urea moiety is able to interact with a recognition motif in the hydrophobic specificity pocket of the enzyme.