Inhibition of heat shock protein 90 with AUY922 represses tumor growth in a transgenic mouse model of islet cell neoplasms.
Neuroendocrinology
; 100(4): 300-9, 2014.
Article
en En
| MEDLINE
| ID: mdl-25301256
ABSTRACT
BACKGROUND:
This study was designed to evaluate the role of heat shock protein 90 (HSP90) in tumor progression of murine islet cell tumors. Blockade of HSP90 has recently been proposed as a therapeutic target, but effects in models of islet cell tumors with AUY922, a newly developed HSP90 inhibitor, have not been examined. MATERIAL ANDMETHODS:
The carcinoid cell line BON-1 and the HSP90 inhibitor AUY922 were used to determine effects on signaling and growth in vitro. In vivo transgenic RIP1-Tag2 mice, which develop islet cell neoplasms, were treated with vehicle or AUY922 (25 mg/kg/twice per week) from week 5 until death. The resected pancreata were evaluated macroscopically and microscopically by immunohistochemistry. Quantitative real-time PCR was performed for HSP90 targets with RNA from islets isolated from treated and untreated RIP1-Tag2 mice.RESULTS:
HSP90 blockade impaired constitutive and growth factor-induced signaling in vitro. Moreover, HSP90 inhibition attenuated in vitro cell growth in a dose-dependent manner. In vivo, AUY922 significantly reduced tumor volume by 92% compared to untreated controls (p = 0.000), and median survival in the used transgenic mouse model was prolonged (110 vs. 119 days; p = 0.75). Quantitative real-time PCR for downstream target genes of HSP90 demonstrated significant downregulation in the islet cell tumors of RIP1-Tag2 mice treated with AUY922, confirming our ability to achieve effective pharmacologic levels of AUY922 within the desired tissue site in vivo.CONCLUSION:
This is the first study to show that the HSP90 antagonist AUY922 may provide a new option for therapy of islet cell neoplasms.
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Neoplasias Pancreáticas
/
Resorcinoles
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Proteínas HSP90 de Choque Térmico
/
Isoxazoles
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Antineoplásicos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Neuroendocrinology
Año:
2014
Tipo del documento:
Article
País de afiliación:
Alemania