Role of the EZH2/miR-200 axis in STAT3-mediated OSCC invasion.

Abstract:

:Abnormal activation of signal transducer and activator of transcription 3 (STAT3) serves a pivotal role in oral squamous cell carcinoma (OSCC) tumor cell invasion into normal tissues or distant organs. However the downstream regulatory network of STAT3 signaling remains unclear. The present study aimed to investigate the potential mechanism underlying how STAT3 triggers enhancer of zeste homolog 2 (EZH2) expression and inhibits microRNA (miR)-200a/b/429 expression in SCC25 and SCC15 cells in vitro and in vivo. Western blotting and reverse transcription-quantitative polymerase chain reaction were performed to detect expression, and numerous functional tests were conducted to explore cancer metastasis. The results indicated that when STAT3 signaling activity was attenuated by Stattic or enhanced with a STAT3 plasmid, the EZH2/miR-200 axis was markedly altered, thus resulting in modulation of the invasion and migration of OSCC cell lines. In addition, loss of function of EZH2 compromised the oncogenic role of STAT3 in both cell lines. F-actin morphology and the expression of epithelial-mesenchymal transition markers were also altered following disruption of the STAT3/EZH2/miR-200 axis. An orthotopic tumor model derived from SCC15 cells was used to confirm that targeting STAT3 or EZH2 suppressed OSCC invasion in vivo. In conclusion, the EZH2/miR-200 axis was revealed to mediate antitumor effects by targeting STAT3 signaling; these findings may provide a novel therapeutic strategy for the treatment of OSCC.

journal_name

Int J Oncol

authors

Wang Y,Guo W,Li Z,Wu Y,Jing C,Ren Y,Zhao M,Kong L,Zhang C,Dong J,Shuang Y,Sun S,Chen J,Wu C,Qiao Y,Qu X,Wang X,Zhang L,Jin R,Zhou X

doi

10.3892/ijo.2018.4293

subject

Has Abstract

pub_date

2018-04-01 00:00:00

pages

1149-1164

issue

4

eissn

1019-6439

issn

1791-2423

journal_volume

52

pub_type

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