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Title: MiR-498 in esophageal squamous cell carcinoma : clinicopathological impacts and functional interactions
Authors: Islam, F
Gopalan, V
Law, S
Tang, JCO 
Chan, KW
Lam, AKY
Keywords: MiR-498
Squamous cell carcinoma
Issue Date: 2017
Publisher: W.B. Saunders
Source: Human pathology, 2017, v. 62, p. 141-151 How to cite?
Journal: Human pathology 
Abstract: MicroRNA-498 plays a crucial role in progression of many carcinomas. The signaling pathways by which miR-498 modulates carcinogenesis are still unknown. Also, miR-498 associated molecular pathogenesis has never been studied in esophageal squamous cell carcinoma (ESCC). Herein, we aimed to examine the expression and functional roles of miR-498 in ESCC as well as its influences on the clinicopathological features in patients with ESCC. Expression of miR-498 was investigated in 93 ESCC tissues and 5 ESCC cell lines using quantitative real-time polymerase chain reaction. In vitro effects of miR-498 on cellular process were studied followed by overexpression of miR-498. Western blot and immunofluorescence techniques were used to identify the interacting targets for miR-498 in ESCC. miR-498 expression was significantly reduced in ESCC when compared with the nonneoplastic esophageal tissues (P < .05). Patients with low miR-498 expression showed different histological grading of cancer and survival rates when compared with the patients with high miR-498 expression. Overexpression of miR-498 in ESCC cell lines induced remarkable reductions of cell proliferation, barrier penetration, and colony formation when compared with control and wild-type counterparts. Also, miR-498 activated the FOXO1/KLF6 transcriptional axis in ESCC. In addition, miR-498 overexpression increased p21 protein expression and led to reduced cancer cell growth. To conclude, reduced expression of miR-498 in ESCC and in vitro analysis have confirmed the tumor suppressor properties of miR-498 by modulating the FOXO1/KLF6 signaling pathway. The changes in miR-498 expression may have impacts on the clinical pathological parameters of ESCC as well as in the management of the patients with ESCC.
ISSN: 0046-8177
EISSN: 1532-8392
DOI: 10.1016/j.humpath.2017.01.014
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