RESUMEN
Since the advent of antibody checkpoint inhibitors as highly efficient drugs for cancer treatment, the development of immunomodulating small molecules in oncology has gained great attention. Drug candidates targeting IDO1, a key enzyme in tryptophan metabolism, are currently under clinical investigation in combination with PD-1/PD-L1 agents as well as with other established anti-tumor therapeutics. A ligand based design approach from hydroxyamidine 4 that aimed at heme-binding IDO1 inhibitors resulted in new compounds with moderate IDO1 potency. A hybrid structure design that made use of the linrodostat structure (2) led to oxalamide derived, heme-displacing IDO1 inhibitors with high cell-based IDO1 potency and a favorable ADME/PK profile.
Asunto(s)
Amidas/farmacología , Descubrimiento de Drogas , Inhibidores Enzimáticos/farmacología , Indolamina-Pirrol 2,3,-Dioxigenasa/antagonistas & inhibidores , Ácido Oxámico/farmacología , Amidas/síntesis química , Amidas/química , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Humanos , Indolamina-Pirrol 2,3,-Dioxigenasa/metabolismo , Estructura Molecular , Ácido Oxámico/síntesis química , Ácido Oxámico/química , Relación Estructura-ActividadRESUMEN
Through structural modification of an oxalamide derived chemotype, a novel class of highly potent, orally bioavailable IDO1-specific inhibitors was identified. Representative compound 18 inhibited human IDO1 with IC50 values of 3.9 nM and 52 nM in a cellular and human whole blood assay, respectively. In vitro assessment of the ADME properties of 18 demonstrated very high metabolic stability. Pharmacokinetic profiling in mice showed a significantly reduced clearance compared to the oxalamides. In a mouse pharmacodynamic model 18 nearly completely suppressed lipopolysaccharide-induced kynurenine production. Hepatocyte data of 18 suggest the human clearance to be in a similar range to linrodostat (1).
Asunto(s)
Amidas/farmacología , Compuestos Bicíclicos con Puentes/farmacología , Descubrimiento de Drogas , Inhibidores Enzimáticos/farmacología , Indolamina-Pirrol 2,3,-Dioxigenasa/antagonistas & inhibidores , Ácido Oxámico/farmacología , Amidas/síntesis química , Amidas/química , Animales , Compuestos Bicíclicos con Puentes/síntesis química , Compuestos Bicíclicos con Puentes/química , Relación Dosis-Respuesta a Droga , Inhibidores Enzimáticos/síntesis química , Inhibidores Enzimáticos/química , Humanos , Indolamina-Pirrol 2,3,-Dioxigenasa/metabolismo , Quinurenina/antagonistas & inhibidores , Quinurenina/biosíntesis , Lipopolisacáridos/antagonistas & inhibidores , Lipopolisacáridos/farmacología , Ratones , Estructura Molecular , Ácido Oxámico/síntesis química , Ácido Oxámico/química , Relación Estructura-ActividadRESUMEN
A novel series of IDO1 inhibitors have been identified with good IDO1 Hela cell and human whole blood activity. These inhibitors contain an indoline or a 3-azaindoline scaffold. Their structure-activity-relationship studies have been explored. Compounds 37 and 41 stood out as leads due to their good potency in IDO1 Hela assay, good IDO1 unbound hWB IC50s, reasonable unbound clearance, and good MRT in rat and dog PK studies.