P300 promotes migration, invasion and epithelial-mesenchymal transition in a nasopharyngeal carcinoma cell line

Liao,Zhi‑Wei; Zhao,Lei; Cai,Mu‑Yan; Xi,Mian; He,Li‑Ru; Yu,Fang; Zhou,Tong‑Chong; Liu,Meng‑Zhong

doi:10.3892/ol.2016.5491

P300 promotes migration, invasion and epithelial-mesenchymal transition in a nasopharyngeal carcinoma cell line

Authors:
- Zhi‑Wei Liao
- Lei Zhao
- Mu‑Yan Cai
- Mian Xi
- Li‑Ru He
- Fang Yu
- Tong‑Chong Zhou
- Meng‑Zhong Liu
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Affiliations: Department of Radiation Oncology, State Key Laboratory of Oncology in South China, Sun Yat‑Sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China, Department of Pathology, State Key Laboratory of Oncology in South China, Sun Yat‑Sen University Cancer Center, Guangzhou, Guangdong 510060, P.R. China, Department of Radiation Oncology, The Tumour Hospital Affiliated of Guangzhou Medical University, Guangzhou, Guangdong 510095, P.R. China
Published online on: December 13, 2016 https://doi.org/10.3892/ol.2016.5491
Pages: 763-769
Copyright: © Liao et al. This is an open access article distributed under the terms of Creative Commons Attribution License.

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Abstract

A previous study demonstrated that p300 is overexpressed in nasopharyngeal carcinoma (NPC), and that its expression is an independent prognostic factor. The aim of the present study is to investigate the role of p300 in human NPC development. A small hairpin (sh) RNA lentiviral expression vector targeting the p300 gene was constructed to suppress the expression of p300 in NPC cells. Knockdown of p300 was verified by reverse transcription‑quantitative polymerase chain reaction and western blotting. Wound‑healing, invasion, immunofluorescence and immunoprecipitation assays were performed to assess the influence of p300 on nasopharyngeal tumorigenesis and metastasis in vitro. The expression of p300 was upregulated in NPC cell lines. After knockdown of p300, the migration and invasion ability of shp300 cells were significantly inhibited (P<0.05). Furthermore, the depletion of p300 expression in NPC cell lines resulted in the upregulation of epithelial phenotype marker E‑cadherin and α‑catenin, and downregulation of mesenchymal phenotype markers N‑cadherin and vimentin. p300 promotes epithelial‑mesenchymal transition (EMT) through the acetylation of Smad2 and Smad3 in the tumor growth factor‑β signaling pathway. In conclusion, p300 may be involved in the invasion and metastasis of NPC through the induction of EMT.

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