RESUMEN
The Aurora family of serine/threonine kinases is essential for mitosis. Their crucial role in cell cycle regulation and aberrant expression in a broad range of malignancies have been demonstrated and have prompted intensive search for small molecule Aurora inhibitors. Indeed, over 10 of them have reached the clinic as potential anticancer therapies. We report herein the discovery and optimization of a novel series of tricyclic molecules that has led to SAR156497, an exquisitely selective Aurora A, B, and C inhibitor with in vitro and in vivo efficacy. We also provide insights into its mode of binding to its target proteins, which could explain its selectivity.
Asunto(s)
Antineoplásicos/farmacología , Aurora Quinasas/antagonistas & inhibidores , Bencimidazoles/farmacología , Inhibidores de Proteínas Quinasas/farmacología , Quinolonas/farmacología , Bibliotecas de Moléculas Pequeñas/farmacología , Animales , Antineoplásicos/química , Antineoplásicos/metabolismo , Aurora Quinasa A/antagonistas & inhibidores , Aurora Quinasa A/química , Aurora Quinasa A/metabolismo , Aurora Quinasa B/antagonistas & inhibidores , Aurora Quinasa B/química , Aurora Quinasa B/metabolismo , Aurora Quinasa C/antagonistas & inhibidores , Aurora Quinasa C/química , Aurora Quinasa C/metabolismo , Aurora Quinasas/química , Aurora Quinasas/metabolismo , Bencimidazoles/química , Bencimidazoles/metabolismo , Femenino , Células HCT116 , Humanos , Ratones SCID , Modelos Químicos , Modelos Moleculares , Estructura Molecular , Neoplasias/tratamiento farmacológico , Neoplasias/patología , Unión Proteica , Inhibidores de Proteínas Quinasas/química , Inhibidores de Proteínas Quinasas/metabolismo , Estructura Terciaria de Proteína , Quinolonas/química , Quinolonas/metabolismo , Células Sf9 , Bibliotecas de Moléculas Pequeñas/química , Bibliotecas de Moléculas Pequeñas/metabolismo , Ensayos Antitumor por Modelo de XenoinjertoRESUMEN
In our continuous efforts to identify and develop novel targeted cancer treatments, a new morpholino-thiazole scaffold active against PI3Kß has been identified. This Letter reports the optimization of this compound class to develop PI3Kß isoform-selective inhibitors with suitable pharmacological properties.
Asunto(s)
Amidas/química , Ácidos Carboxílicos/química , Indoles/química , Inhibidores de las Quinasa Fosfoinosítidos-3 , Inhibidores de Proteínas Quinasas/química , Amidas/síntesis química , Animales , Sitios de Unión , Células CACO-2 , Ácidos Carboxílicos/síntesis química , Ácidos Carboxílicos/farmacología , Humanos , Masculino , Simulación del Acoplamiento Molecular , Permeabilidad/efectos de los fármacos , Fosfatidilinositol 3-Quinasas/metabolismo , Isoformas de Proteínas/antagonistas & inhibidores , Isoformas de Proteínas/metabolismo , Inhibidores de Proteínas Quinasas/síntesis química , Inhibidores de Proteínas Quinasas/farmacología , Estructura Terciaria de Proteína , Proteínas Proto-Oncogénicas c-akt/antagonistas & inhibidores , Proteínas Proto-Oncogénicas c-akt/metabolismo , Ratas , Ratas Sprague-Dawley , Tiazoles/químicaRESUMEN
Compelling molecular biology publications have reported the implication of phosphoinositide kinase PI3Kß in PTEN-deficient cell line growth and proliferation. These findings supported a scientific rationale for the development of PI3Kß-specific inhibitors for the treatment of PTEN-deficient cancers. This paper describes the discovery of 2-[2-(2,3-dihydro-indol-1-yl)-2-oxo-ethyl]-6-morpholin-4-yl-3H-pyrimidin-4-one (7) and the optimization of this new series of active and selective pyrimidone indoline amide PI3Kß inhibitors. 2-[2-(2-Methyl-2,3-dihydro-indol-1-yl)-2-oxo-ethyl]-6-morpholin-4-yl-3H-pyrimidin-4-one (28), identified following a carefully designed methyl scan, displayed improved physicochemical and in vitro pharmacokinetic properties. Structural biology efforts enabled the acquisition of the first X-ray cocrystal structure of p110ß with the selective inhibitor compound 28 bound to the ATP site. The nonplanar binding mode described herein is consistent with observed structure-activity relationship for the series. Compound 28 demonstrated significant in vivo activity in a UACC-62 xenograft model in mice, warranting further preclinical investigation. Following successful development, compound 28 entered phase I/Ib clinical trial in patients with advanced cancer.
Asunto(s)
Antineoplásicos/química , Indoles/química , Neoplasias/tratamiento farmacológico , Fosfohidrolasa PTEN/deficiencia , Inhibidores de las Quinasa Fosfoinosítidos-3 , Pirimidinonas/química , Animales , Antineoplásicos/farmacocinética , Antineoplásicos/farmacología , Disponibilidad Biológica , Línea Celular Tumoral , Permeabilidad de la Membrana Celular , Cristalografía por Rayos X , Perros , Ensayos de Selección de Medicamentos Antitumorales , Femenino , Xenoinjertos , Humanos , Indoles/farmacocinética , Indoles/farmacología , Masculino , Ratones , Ratones Endogámicos BALB C , Ratones SCID , Microsomas Hepáticos/metabolismo , Conformación Molecular , Simulación del Acoplamiento Molecular , Trasplante de Neoplasias , Neoplasias/enzimología , Fosfohidrolasa PTEN/genética , Unión Proteica , Pirimidinonas/farmacocinética , Pirimidinonas/farmacología , Ratas , Ratas Desnudas , Solubilidad , Estereoisomerismo , Relación Estructura-ActividadRESUMEN
A new series of IGF-1R inhibitors related to hydantoins were identified from a lead originating from HTS. Their noncompetitive property as well as their slow binding characteristics provided a series of compounds with unique selectivity and excellent cellular activities.