Inhibition of Notch1 signaling overcomes resistance to the death ligand Trail by specificity protein 1-dependent upregulation of death receptor 5.
Cell Death Dis
; 6: e1921, 2015 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-26469969
ABSTRACT
The Notch1 signaling pathway contributes to tumorigenesis by influencing differentiation, proliferation and apoptosis. Here, we demonstrate that inhibition of the Notch1 signaling pathway sensitizes glioblastoma cell lines and glioblastoma initiating cells to apoptosis induced by the death ligand TRAIL. This sensitization occurs through transcriptional upregulation of the death receptor 5 (DR5, TRAIL-R2). The increase in DR5 expression is abrogated by concomitant repression of the transcription factor Sp1, which directly binds to the DR5 promoter in the absence of Notch1 as revealed by chromatin immunoprecipitation. Consistent with these findings, Notch1 inhibition resulted in increased DR5 promoter activity, which was impaired by mutation of one out of two Sp1-binding sites within the proximal DR5 promoter. Moreover, we demonstrate that JNK signaling contributes to the regulation of DR5 expression by Notch1. Taken together, our results identify Notch1 as key driver for TRAIL resistance and suggest Notch1 as a promising target for anti-glioblastoma therapy.
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Base de dados:
MEDLINE
Assunto principal:
Fator de Transcrição Sp1
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Receptor Notch1
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Ligante Indutor de Apoptose Relacionado a TNF
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Receptores do Ligante Indutor de Apoptose Relacionado a TNF
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Antineoplásicos
Idioma:
En
Ano de publicação:
2015
Tipo de documento:
Article