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2017 ; 7
(ä): 42928
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gab.com Text
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English Wikipedia
TIGAR knockdown radiosensitizes TrxR1-overexpressing glioma in vitro and in vivo
via inhibiting Trx1 nuclear transport
#MMPMID28338004
Zhang Y
; Chen F
; Tai G
; Wang J
; Shang J
; Zhang B
; Wang P
; Huang B
; Du J
; Yu J
; Zhang H
; Liu F
Sci Rep
2017[Mar]; 7
(ä): 42928
PMID28338004
show ga
The up-regulation of thioredoxin reductase-1 (TrxR1) is detected in more than
half of gliomas, which is significantly associated with increased malignancy
grade and recurrence rate. The biological functions of NADPH-dependent TrxR1 are
mainly associated with reduced thioredoxin-1 (Trx1) which plays critical roles in
cellular redox signaling and tumour radio-resistance. Our previous work has
proved that TP53 induced glycolysis and apoptosis regulator (TIGAR) knockdown
could notably radiosensitize glioma cells. However, whether TrxR1-overexpressing
glioma cells could be re-radiosensitized by TIGAR silence is still far from
clear. In the present study, TrxR1 was stably over-expressed in U-87MG and T98G
glioma cells. Both in vitro and in vivo data demonstrated that the
radiosensitivity of glioma cells was considerably diminished by TrxR1
overexpression. TIGAR abrogation was able to radiosensitize TrxR1-overexpressing
gliomas by inhibiting IR-induced Trx1 nuclear transport. Post-radiotherapy, TIGAR
low-expression predicted significant longer survival time for animals suffering
from TrxR1-overexpessing xenografts, which suggested that TIGAR abrogation might
be a promising strategy for radiosensitizing TrxR1-overexpressing glial tumours.