RESUMEN
Microsomal prostaglandin E(2) synthase-1 (mPGES-1) is a novel therapeutic target for the treatment of inflammation and pain. In the preceding letter, we detailed the discovery of clinical candidate PF-04693627, a potent mPGES-1 inhibitor possessing a novel benzoxazole structure. While PF-04693627 was undergoing further preclinical profiling, we sought to identify a back-up mPGES-1 inhibitor that differentiated itself from PF-04693627. The design, synthesis, mPGES-1 activity and in vivo PK of a novel set of substituted benzoxazoles are described herein. Also described is a conformation-based hypothesis for mPGES-1 activity based on the preferred conformation of the cyclohexane ring within this class of inhibitors.
Asunto(s)
Benzoxazoles/química , Benzoxazoles/farmacología , Inhibidores Enzimáticos/química , Inhibidores Enzimáticos/farmacología , Oxidorreductasas Intramoleculares/antagonistas & inhibidores , Benzoxazoles/síntesis química , Diseño de Fármacos , Inhibidores Enzimáticos/síntesis química , Humanos , Oxidorreductasas Intramoleculares/química , Oxidorreductasas Intramoleculares/metabolismo , Modelos Moleculares , Conformación Molecular , Prostaglandina-E Sintasas , Relación Estructura-ActividadRESUMEN
Potent, highly selective and orally-bioavailable MMP-13 inhibitors have been identified based upon a (pyridin-4-yl)-2H-tetrazole scaffold. Co-crystal structure analysis revealed that the inhibitors bind at the S(1)(') active site pocket and are not ligands for the catalytic zinc atom. Compound 29b demonstrated reduction of cartilage degradation biomarker (TIINE) levels associated with cartilage protection in a preclinical rat osteoarthritis model.
Asunto(s)
Inhibidores de la Metaloproteinasa de la Matriz , Osteoartritis/tratamiento farmacológico , Ácidos Picolínicos/química , Inhibidores de Proteasas/química , Tetrazoles/química , Administración Oral , Animales , Sitios de Unión , Cartílago/efectos de los fármacos , Cartílago/metabolismo , Dominio Catalítico , Cristalografía por Rayos X , Modelos Animales de Enfermedad , Descubrimiento de Drogas , Metaloproteinasa 13 de la Matriz/metabolismo , Ácidos Picolínicos/síntesis química , Ácidos Picolínicos/farmacología , Inhibidores de Proteasas/síntesis química , Inhibidores de Proteasas/farmacología , Ratas , Tetrazoles/síntesis química , Tetrazoles/farmacología , Zinc/químicaRESUMEN
Matrix metalloproteinase-13 (MMP-13) is a zinc-dependent protease responsible for the cleavage of type II collagen, the major structural protein of articular cartilage. Degradation of this cartilage matrix leads to the development of osteoarthritis. We previously have described highly potent and selective carboxylic acid containing MMP-13 inhibitors; however, nephrotoxicity in preclinical toxicology species precluded development. The accumulation of compound in the kidneys mediated by human organic anion transporter 3 (hOAT3) was hypothesized as a contributing factor for the finding. Herein we report our efforts to optimize the MMP-13 potency and pharmacokinetic properties of non-carboxylic acid leads resulting in the identification of compound 43a lacking the previously observed preclinical toxicology at comparable exposures.