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2016 ; 7
(16
): 21728-41
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gab.com Text
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English Wikipedia
4EGI-1 induces apoptosis and enhances radiotherapy sensitivity in nasopharyngeal
carcinoma cells via DR5 induction on 4E-BP1 dephosphorylation
#MMPMID26942880
Wang W
; Li J
; Wen Q
; Luo J
; Chu S
; Chen L
; Qing Z
; Xie G
; Xu L
; Alnemah MM
; Li M
; Fan S
; Zhang H
Oncotarget
2016[Apr]; 7
(16
): 21728-41
PMID26942880
show ga
The eIF4F complex regulated by a various group of eIF4E-binding proteins (4E-BPs)
can initial the protein synthesis. Small molecule compound 4EGI-1, an inhibitor
of the cap-dependent translation initiation through disturbing the interaction
between eIF4E and eIF4G which are main elements of the eIF4E complex, has been
reported to suppress cell proliferation by inducing apoptosis in many types of
cancer. And death receptor 5 (DR5) is a major component in the extrinsic
apoptotic pathway. However, the correlation among 4EGI-1, DR5 and 4E-BPs have not
been discovered in NPC now. Therefore, we intend to find out the effect of 4EGI-1
on the apoptosis process of NPC and the relationship among 4EGI-1, DR5 and
4E-BPs. Our results revealed a significant down regulation of DR5 expression in
NPC tissues, which inversely correlated with lymph node metastasis status and
clinical stages. Depressed DR5 expression was an independent biomarker for poor
prognosis in NPC, and elevated DR5 expression showed longer overall survival time
in 174 NPC patients. Besides, 4EGI-1 induced apoptosis in NPC cells through the
DR5-caspase-8 axis on 4E-BP1 and eIF4E dephosphorylation exerting positive
influence on their anti-tumor activities. The induction of DR5 also sensitized
NPC cells to radiotherapy, and the SER was 1.195. These results establish the
death receptor pathway as a novel anticancer mechanism of eIF4E/eIF4G interaction
inhibitor in NPC.
|Adaptor Proteins, Signal Transducing/*metabolism
[MESH]