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2015 ; 8
(4
): 3580-90
Nephropedia Template TP
gab.com Text
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LRIG1 enhances the radiosensitivity of radioresistant human glioblastoma U251
cells via attenuation of the EGFR/Akt signaling pathway
#MMPMID26097540
Yang JA
; Liu BH
; Shao LM
; Guo ZT
; Yang Q
; Wu LQ
; Ji BW
; Zhu XN
; Zhang SQ
; Li CJ
; Chen QX
Int J Clin Exp Pathol
2015[]; 8
(4
): 3580-90
PMID26097540
show ga
The radiotherapy as a local and regional modality is widely applied in treatment
of glioma, but most glioblastomas are commonly resistant to irradiation
treatment. It remains challengeable to seek out efficient strategies to conquer
the resistance of human glioblastoma cells to radiotherapy. Leucine-rich repeats
and immunoglobulin-like domains protein 1 (LRIG1) is a newly discovered tumor
suppressor which involved in regulation of chemosensitivity in various human
cancer cells. In the present study, we established a radioresistant U251 cell
line (U251R) to investigate the role of LRIG1 in regulation of radiosensitivity
in human glioblastoma cells. Significantly decreased expression level of LRIG1
and enhanced expression of EGFR and phosphorylated Akt were detected in U251R
cells compared with the parental U251 cells. U251R cells exhibited an advantage
in colony formation ability, which accompanied by remarkably reduced
X-ray-induced ?-H2AX foci formation and cell apoptosis. LRIG1 overexpression
significantly inhibited the colony formation ability of U251R cells and obviously
enhanced X-ray-induced?-H2AX foci formation and cell apoptosis. In addition,
up-regulated expression of LRIG1 suppressed the expression level of EGFR and
phosphorylated Akt protein. Our results demonstrated that LRIG1 expression was
related to the radiosensitivity of human glioblastoma cells and may play an
important role in the regulation of cellular radiosensitivity of human
glioblastoma cells through the EGFR/Akt signaling pathway.