PURα mediates epithelial-mesenchymal transition to promote esophageal squamous cell carcinoma progression by regulating Snail2

Jiajia Gao, Lusong Tian, Yulin Sun, Wei Li, Lina Zhao, Yan Sun, Zongpan Jing, Lanping Zhou, Fang Liu, Xiaohang Zhao

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Esophageal squamous cell carcinoma (ESCC) is one of the most common lethal cancers in the world. Dysregulation of purine-rich element binding protein alpha (PURα), which contributes to the initiation of PURΑ syndrome, is reportedly involved in the progression of multiple cancers, but its function and underlying mechanisms in ESCC progression remain unclear. Here, we first demonstrated that PURα promoted cell growth, migration and invasion in ESCC both in vitro and in vivo. An immunohistochemistry assay was then performed on 225 ESCC tissues, showing that high PURα expression was positively associated with lymph node metastasis and the AJCC stage, and the ESCC patients with positive PURα expression had worse survival. In addition, RNA sequencing implied that PURα induced epithelial-mesenchymal transition (EMT) in ESCC, which was further confirmed by qPCR, Western blotting and immunofluorescence analyses. Mechanistically, PURα enhanced the transcription of Snail2 by binding to its promoter region. Knockdown of Snail2 reversed PURα-induced EMT and inhibited the migration and invasion of ESCC cells. In conclusion, this study indicated that PURα promotes Snail2 transcriptional activity to induce EMT during ESCC progression.

Original languageEnglish
Pages (from-to)98-110
Number of pages13
JournalCancer Letters
Volume498
DOIs
StatePublished - Feb 1 2021

Keywords

  • Epithelial-mesenchymal transition
  • Esophageal squamous cell carcinoma
  • Migration and invasion
  • PURα
  • Snail2

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