Pharmacokinetics and efficacy of the spleen tyrosine kinase inhibitor r406 after ocular delivery for retinoblastoma.
Pharm Res
; 31(11): 3060-72, 2014 Nov.
Article
en En
| MEDLINE
| ID: mdl-24906597
ABSTRACT
PURPOSE:
Retinoblastoma is a childhood cancer of the retina. Clinical trials have shown that local delivery of broad spectrum chemotherapeutic agents is efficacious. Recent studies characterizing the genomic and epigenomic landscape of retinoblastoma identified spleen tyrosine kinase (SYK) as a promising candidate for targeted therapy. The purpose of this study was to conduct preclinical testing of the SYK antagonist R406 to evaluate it as a candidate for retinoblastoma treatment.METHODS:
The efficacy of the SYK antagonist R406 delivered locally in a human orthotopic xenograft mouse model of retinoblastoma was tested. Intraocular exposure of R406 was determined for various routes and formulations.RESULTS:
There was no evidence of efficacy for subconjunctival. R406. Maximal vitreal concentration was 10-fold lower than the minimal concentration required to kill retinoblastoma cells in vitro. Dosage of R406 subconjunctivally from emulsion or suspension formulations, direct intravitreal injection of the soluble prodrug of R406 (R788), and repeated topical administration of R406 all increased vitreal exposure, but failed to reach the exposure required for retinoblastoma cell death in culture.CONCLUSION:
Taken together, these data suggest that R406 is not a viable clinical candidate for the treatment of retinoblastoma. This study highlights the importance of pharmacokinetic testing of molecular targeted retinoblastoma therapeutics.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Oxazinas
/
Piridinas
/
Retinoblastoma
/
Proteínas Tirosina Quinasas
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Neoplasias de la Retina
/
Péptidos y Proteínas de Señalización Intracelular
/
Inhibidores de Proteínas Quinasas
Límite:
Animals
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Female
/
Humans
Idioma:
En
Revista:
Pharm Res
Año:
2014
Tipo del documento:
Article
País de afiliación:
Estados Unidos