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MALAT1 long ncRNA promotes gastric cancer metastasis by suppressing PCDH10

Ying Qi1, Hong Sain Ooi2, Jun Wu3

  • 1School of Biomedical Engineering, Bio-ID Research Center, State Key Laboratory for Oncogenes and Related Genes, Shanghai Jiao Tong University, Shanghai, China.

Oncotarget
|February 13, 2016
PubMed

Insights

This study reveals that enhancer of zeste homolog 2 (EZH2) binds many transcripts in gastric cancer cells. The long noncoding RNA MALAT1 was found to promote cancer progression by interacting with EZH2.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Epigenetics

Background:

  • Enhancer of zeste homolog 2 (EZH2) is a key component of polycomb repressive complex 2 (PRC2).
  • EZH2 overexpression is common in human cancers, driving tumor initiation and progression via gene silencing.
  • Noncoding RNAs (ncRNAs) are known to recruit EZH2 to specific genomic sites, influencing gene expression.

Purpose of the Study:

  • To globally profile EZH2-associated transcripts in human gastric cancer.
  • To identify novel roles of EZH2 and its interacting RNAs in gastric tumorigenesis.
  • To investigate the specific function of the long noncoding RNA MALAT1 in EZH2-mediated cancer progression.

Main Methods:

  • RNA immunoprecipitation sequencing (RIP-seq) was employed to identify EZH2-bound transcripts.
  • Gastric cancer cell lines were used for transcriptomic profiling.
  • Functional assays were performed to assess the impact of MALAT1-EZH2 interaction on cancer cell behavior.

Main Results:

  • Over 8,000 EZH2-associated transcripts were identified, including coding and noncoding RNAs.
  • The long noncoding RNA MALAT1 was confirmed to bind EZH2.
  • MALAT1 was shown to suppress the tumor suppressor PCDH10, enhancing gastric cancer cell migration and invasion.

Conclusions:

  • This study provides a comprehensive map of the EZH2-associated transcriptome in gastric cancer.
  • EZH2 plays a significant role in gastric tumorigenesis through interactions with various transcripts.
  • The lncRNA MALAT1-EZH2 axis represents a potential therapeutic target for gastric cancer.
Keywords:
EZH2MALAT1RIP-seqgastric cancertranscriptional silencing

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