Design of a brain-penetrant CDK4/6 inhibitor for glioblastoma.
Bioorg Med Chem Lett
; 29(16): 2294-2301, 2019 08 15.
Article
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| MEDLINE
| ID: mdl-31307887
ABSTRACT
CDK4 and CDK6 are kinases with similar sequences that regulate cell cycle progression and are validated targets in the treatment of cancer. Glioblastoma is characterized by a high frequency of CDKN2A/CCND2/CDK4/CDK6 pathway dysregulation, making dual inhibition of CDK4 and CDK6 an attractive therapeutic approach for this disease. Abemaciclib, ribociclib, and palbociclib are approved CDK4/6 inhibitors for the treatment of HR+/HER2- breast cancer, but these drugs are not expected to show strong activity in brain tumors due to poor blood brain barrier penetration. Herein, we report the identification of a brain-penetrant CDK4/6 inhibitor derived from a literature molecule with low molecular weight and topological polar surface area (MWâ¯=â¯285 and TPSAâ¯=â¯66â¯Å2), but lacking the CDK2/1 selectivity profile due to the absence of a basic amine. Removal of a hydrogen bond donor via cyclization of the pyrazole allowed for the introduction of basic and semi-basic amines, while maintaining in many cases efflux ratios reasonable for a CNS program. Ultimately, a basic spiroazetidine (cpKaâ¯=â¯8.8) was identified that afforded acceptable selectivity over anti-target CDK1 while maintaining brain-penetration in vivo (mouse Kp,uuâ¯=â¯0.20-0.59). To probe the potency and selectivity, our lead compound was evaluated in a panel of glioblastoma cell lines. Potency comparable to abemaciclib was observed in Rb-wild type lines U87MG, DBTRG-05MG, A172, and T98G, while Rb-deficient cell lines SF539 and M059J exhibited a lack of sensitivity.
Palabras clave
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Neoplasias Encefálicas
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Diseño de Fármacos
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Glioblastoma
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Inhibidores de Proteínas Quinasas
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Quinasa 4 Dependiente de la Ciclina
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Quinasa 6 Dependiente de la Ciclina
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Antineoplásicos
Límite:
Humans
Idioma:
En
Revista:
Bioorg Med Chem Lett
Asunto de la revista:
BIOQUIMICA
/
QUIMICA
Año:
2019
Tipo del documento:
Article