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2016 ; 16
(1
): 178
Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Chloroquine, an autophagy inhibitor, potentiates the radiosensitivity of glioma
initiating cells by inhibiting autophagy and activating apoptosis
#MMPMID27644442
Ye H
; Chen M
; Cao F
; Huang H
; Zhan R
; Zheng X
BMC Neurol
2016[Sep]; 16
(1
): 178
PMID27644442
show ga
BACKGROUND: Glioblastoma is refractory to conventional treatment, which is
combined of surgery, chemotherapy and radiotherapy. Recent studies have shown
that glioma initiating cells (GICs) contribute to tumorigenesis and
radioresistance. Recently, other studies showed that the GICs use the autophagy
as the major pathway to survive. Chloroquine, an anti-malarial chemical, is an
autophagic inhibitor which blocks autophagosome fusion with lysosome and slows
down lysosomal acidification. The aim of this study was to explore the mechanisms
of chloroquine on the radiosensitivity of GICs. METHODS: Human glioblastoma cell
lines U87 were investigated. MTT and clonogenic survival assay were used to
evaluate the cell viability and survival from radiation. The formation of
autophagosomes were evaluated by immunofluorescence. Annexin V-FITC/PI staining
and flow cytometry were used to quantify the apoptotic cells. The expression
levels of proteins were analyzed by Western blot. Cell cycle status was analyzed
by checking DNA content after staining with PI. A comet assay was used to assess
the DNA repair in the cells. Tumorsphere assay was used for evaluating GICs'
renewal ability. RESULTS: Treatment of U87 GICs with chloroquine (10-80 nmol/L)
alone inhibited the cell growth in a dose-dependent manner. A dose of chloroquine
(20 nmol/L) obviously enhanced the radiation sensitivity of U87 GICs., we found
more punctate patterns of microtubule-associated protein LC3 immunoreactivity in
radiation-treated U87 GICs, and the level of membrane-bound LC3-II was obviously
enhanced. A combination of radiation and chloroquine obviously enhanced the U87
GICs' apoptosis, as demonstrated by the enhanced levels of caspase-3, and reduced
level of Bcl-2. In additon, combination of radiation and chloroquine cause G1/G0
cell cycle arrest. what's more, Chloroquine obviously weakened the repair of
radiation-induced DNA damage as reflected by the tail length of the comet.
Combination treatment of irradiation and chloroquine has synergistic effects on
decreasing the GICs' tumorsphere number and diameter. CONCLUSION: Chloroquine
enhances the radiosensitivity of GICs in vitro, suggesting the feasibility of
joint treatment with chloroquine with radiation for GBM.