Reduced LINC00551 expression promotes proliferation and invasion of esophageal squamous cancer by increase in HSP27 phosphorylation.

Journal of Cellular Physiology
Xiong PengWei Zhuang

Abstract

Esophageal squamous cell carcinoma (ESCC) is one of the deadliest cancers, and long noncoding RNAs (lncRNAs) regulate gene expression or activities. This study investigated the role of lncRNA LINC00551 in ESCC development and progression. Three paired ESCC and normal tissues were subjected to next-generation sequencing and we identified 82 upregulated and 60 downregulated lncRNAs, including LINC00551, which was confirmed to markedly downregulated in 78 ESCC tissues and in the Gene Expression Profiling Interactive Analysis data set. Downregulated LINC00551 expression was associated with lymph node metastasis, advanced TNM stage, and tumor size. Moreover, downregulated LINC00551 expression was also associated with poor progression-free survival and overall survival of ESCC patients. In vitro and in vivo, LINC00551 overexpression inhibited ESCC cell proliferation and invasion, whereas knockdown of LINC00551 expression promoted ESCC cell proliferation and invasion. RNA pull-down and mass spectrometry assays identified the potential LINC00551 binding proteins, and HSP27 was a promising LINC00551 targeting proteins after RNA immunoprecipitation assay. At the protein level, LINC00551 bound to and decreased HSP27 phosphorylation, and i...Continue Reading

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