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2014 ; 105
(2
): 219-27
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N1-guanyl-1,7-diaminoheptane sensitizes bladder cancer cells to doxorubicin by
preventing epithelial-mesenchymal transition through inhibition of eukaryotic
translation initiation factor 5A2 activation
#MMPMID24262005
Yang J
; Yu H
; Shen M
; Wei W
; Xia L
; Zhao P
Cancer Sci
2014[Feb]; 105
(2
): 219-27
PMID24262005
show ga
Drug resistance greatly reduces the efficacy of doxorubicin-based chemotherapy in
bladder cancer treatment; however, the underlying mechanisms are poorly
understood. We aimed to investigate whether N1-guanyl-1,7-diaminoheptane (GC7),
which inhibits eukaryotic translation initiation factor 5A2 (eIF5A2) activation,
exerts synergistic cytotoxicity with doxorubicin in bladder cancer, and whether
eIF5A2 is involved in chemoresistance to doxorubicin-based bladder cancer
treatment. BIU-87, J82, and UM-UC-3 bladder cancer cells were transfected with
eIF5A2 siRNA or negative control siRNA before incubation with doxorubicin alone
or doxorubicin plus GC7 for 48 h. Doxorubicin cytotoxicity was enhanced by GC7 in
BIU-87, J82, and UM-UC-3 cells. It significantly inhibited activity of eIF5A2,
suppressed doxorubicin-induced epithelial-mesenchymal transition in BIU-87 cells,
and promoted mesenchymal-epithelial transition in J82 and UM-UC-3 cells.
Knockdown of eIF5A2 sensitized bladder cancer cells to doxorubicin, prevented
doxorubicin-induced EMT in BIU-87 cells, and encouraged mesenchymal-epithelial
transition in J82 and UM-UC-3 cells. Combination therapy with GC7 may enhance the
therapeutic efficacy of doxorubicin in bladder cancer by inhibiting eIF5A2
activation and preventing epithelial-mesenchymal transition.