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MAGI2-AS3 inhibits breast cancer by downregulating DNA methylation of MAGI2

Xiaolong Xu1, Xiaoning Yuan1, Jiali Ni2

  • 1Department of Pathology and Pathophysiology, Hubei Provincial Key Laboratory of Developmentally Originated Disease, School of Basic Medical Sciences, Wuhan University, Wuhan, Hubei, China.

Journal of Cellular Physiology
|July 31, 2020
PubMed

Insights

This study identifies MAGI2-AS3 as a low-expressing long noncoding RNA in breast cancer. Overexpression of MAGI2-AS3 inhibits cancer cell growth and migration by downregulating the Wnt/β-catenin pathway.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Breast cancer remains a significant global health threat for women.
  • Long noncoding RNAs (lncRNAs) are increasingly recognized for their roles in cancer development.
  • Understanding the specific functions of lncRNAs in breast cancer is crucial for therapeutic advancements.

Purpose of the Study:

  • To identify and characterize novel long noncoding RNAs involved in breast cancer.
  • To elucidate the molecular mechanisms by which MAGI2-AS3 influences breast cancer progression.
  • To explore MAGI2-AS3 as a potential therapeutic target for breast cancer intervention.

Main Methods:

  • Analysis of The Cancer Genome Atlas (TCGA) breast cancer tissue sequencing data.
  • Screening and validation of differentially expressed long noncoding RNAs, focusing on MAGI2-AS3.
  • Gene coexpression analysis, cell proliferation and migration assays, and DNA methylation analysis.
  • Investigation of the Wnt/β-catenin pathway and the role of TET1 in MAGI2-AS3 regulation.

Main Results:

  • MAGI2-AS3 was identified as a significantly downregulated lncRNA in breast cancer tissues.
  • MAGI2-AS3 expression positively correlated with its protein-coding gene partner, MAGI2.
  • Overexpression of MAGI2-AS3 or MAGI2 suppressed breast cancer cell proliferation and migration.
  • MAGI2-AS3 was found to downregulate DNA methylation of the MAGI2 promoter, suggesting a cis-acting regulatory role.
  • Inhibition of TET1 reversed the effects of MAGI2-AS3 overexpression on MAGI2 expression and cellular phenotypes.

Conclusions:

  • MAGI2-AS3 plays a tumor-suppressive role in breast cancer by inhibiting the Wnt/β-catenin pathway.
  • MAGI2-AS3 functions, in part, by epigenetically regulating MAGI2 expression through DNA demethylation.
  • MAGI2-AS3 represents a promising novel therapeutic target for metastatic breast cancer treatment.
Keywords:
DNA methylationMAGI2MAGI2-AS3breast cancer

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