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2018 ; 9
(2
): 238
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Long noncoding RNA GAS5 promotes bladder cancer cells apoptosis through
inhibiting EZH2 transcription
#MMPMID29445179
Wang M
; Guo C
; Wang L
; Luo G
; Huang C
; Li Y
; Liu D
; Zeng F
; Jiang G
; Xiao X
Cell Death Dis
2018[Feb]; 9
(2
): 238
PMID29445179
show ga
Aberrant expression of long noncoding RNA GAS5 in bladder cancer (BC) cells was
identified in recent studies. However, the regulatory functions and underlying
molecular mechanisms of GAS5 in BC development remain unclear. Here, we confirmed
that there was a negative correlation between GAS5 level and bladder tumor
clinical stage. Functionally, overexpression of GAS5 reduced cell viability and
induced cell apoptosis in T24 and EJ bladder cancer cells. Mechanistically, GAS5
effectively repressed EZH2 transcription by directly interacting with E2F4 and
recruiting E2F4 to EZH2 promoter. We previously reported that miR-101 induced the
apoptosis of BC cells by inhibiting the expression of EZH2. Interestingly, the
present study showed that downregulation of EZH2 by GAS5 resulted in
overexpression of miR-101 in T24 and EJ cells. Furthermore, the level of GAS5 was
increased under the treatment of Gambogic acid (GA), a promising natural
anti-cancer compound, whereas knockdown of GAS5 suppressed the inhibitory effect
of GA on cell viability and abolished GA-induced apoptosis in T24 and EJ cells.
Taken together, our findings demonstrated a tumor-suppressor role of GAS5 by
inhibiting EZH2 on transcriptional level, and additionally provided a novel
therapeutic strategy for treating human bladder cancer.