Design and synthesis of aryl-piperidine derivatives as potent and selective PET tracers for cholesterol 24-hydroxylase (CH24H).
Eur J Med Chem
; 240: 114612, 2022 Oct 05.
Article
en En
| MEDLINE
| ID: mdl-35863274
ABSTRACT
Cholesterol 24-hydroxylase (CH24H, CYP46A1) is a cytochrome P450 family enzyme that maintains the homeostasis of brain cholesterol. Soticlestat, a potent and selective CH24H inhibitor, is in development as a therapeutic agent for Dravet syndrome and Lennox-Gastaut syndrome. Herein, we report the discovery of aryl-piperidine derivatives as potent and selective CH24H positron emission tomography (PET) tracers which can be used for dose guidance of a clinical CH24H inhibitor and as a diagnostic tool for CH24H-related pathology. Starting from compound 1 (IC50 = 16 nM, logD = 1.7), which was reported as a CH24H inhibitor with lower lipophilicity, a18F-labeling site (3-fluoroazetidine) was incorporated by structure-based drug design (SBDD) utilizing the co-crystal structure of a compound 1 analog. Subsequent optimization to adjust key parameters for PET tracers, such as potency, lipophilicity, brain penetration, and unbound plasma protein binding, enabled compounds 3f (IC50 = 8.8 nM) and 3g (IC50 = 8.7 nM) as PET imaging candidates. Selectivity of these compounds for CH24H was validated by a brain distribution study using CH24H-WT and KO mice. In non-human primate PET imaging, [18F]3f and [18F]3g showed similar regional uptake in the brain, indicating that these tracers were specific to the CH24H-expressed regions and validated the expression of CH24H in the living brain by different tracers.
Palabras clave
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Piridinas
/
Tomografía de Emisión de Positrones
Tipo de estudio:
Guideline
Límite:
Animals
Idioma:
En
Revista:
Eur J Med Chem
Año:
2022
Tipo del documento:
Article
País de afiliación:
Japón