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2014 ; 5
(8
): e1367
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Autophagy promotes paclitaxel resistance of cervical cancer cells: involvement of
Warburg effect activated hypoxia-induced factor 1-?-mediated signaling
#MMPMID25118927
Peng X
; Gong F
; Chen Y
; Jiang Y
; Liu J
; Yu M
; Zhang S
; Wang M
; Xiao G
; Liao H
Cell Death Dis
2014[Aug]; 5
(8
): e1367
PMID25118927
show ga
Paclitaxel is one of the most effective chemotherapy drugs for advanced cervical
cancer. However, acquired resistance of paclitaxel represents a major barrier to
successful anticancer treatment. In this study, paclitaxel-resistant HeLa
sublines (HeLa-R cell lines) were established by continuous exposure and
increased autophagy level was observed in HeLa-R cells. 3-Methyladenine or ATG7
siRNA, autophagy inhibitors, could restore sensitivity of HeLa-R cells to
paclitaxel compared with parental HeLa cells. To determine the underlying
molecular mechanism, differentially expressed proteins between HeLa and HeLa-R
cells were identified by two-dimensional gel electrophoresis coupled with
electrospray ionization quadrupole time-of-flight MS/MS. We found
glycolysis-associated proteins were upregulated in HeLa-R cell lines. Inhibition
of glycolysis by 2-deoxy-D-glucose or koningic acid could decrease autophagy and
enhance sensitivity of HeLa-R cells to paclitaxel. Moreover, glycolysis could
activate HIF1-?. Downregulation of HIF1-? by specific siRNA could decrease
autophagy and resensitize HeLa-R cells to paclitaxel. Taken together, a possible
Warburg effect activated HIF1-?-mediated signaling-induced autophagic pathway is
proposed, which may provide new insight into paclitaxel chemoresistance.