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Identification of microRNA-93 as a functional dysregulated miRNA in triple-negative breast cancer

Jinhua Hu1, Juan Xu, Yuquan Wu

  • 1Department of Geriatrics, the 117th Hospital of PLA, #14 Lingyin Road, Xihu District, Hangzhou, 310013, Zhejiang, China, hujinhua@stu.xjtu.edu.cn.

Tumour Biology : the Journal of the International Society for Oncodevelopmental Biology and Medicine
|September 21, 2014
PubMed

Insights

MicroRNAs (miRNAs) play a role in triple-negative breast cancer (TNBC). Researchers identified distinct miRNA profiles in TNBC, with miR-93 potentially serving as a biomarker for this aggressive cancer subtype.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are crucial in cancer development and treatment resistance.
  • The specific role of miRNAs in triple-negative breast cancer (TNBC) remains underexplored.
  • TNBC is an aggressive subtype lacking targeted therapies, necessitating biomarker discovery.

Purpose of the Study:

  • To investigate the miRNA expression profile in TNBC.
  • To identify specific miRNAs associated with TNBC characteristics.
  • To explore the functional role of identified miRNAs in cancer progression.

Main Methods:

  • miRNA microarray analysis to identify differentially expressed miRNAs.
  • Quantitative real-time polymerase chain reaction (qRT-PCR) for verification.
  • In situ hybridization to assess miR-93 expression in 119 breast cancer cases.
  • Cell-based assays (MTT, wound healing, transwell) to evaluate proliferation, migration, and invasion.

Main Results:

  • Seven miRNAs were upregulated, and ten were downregulated in TNBC compared to non-TNBC.
  • miR-93 expression was significantly elevated in TNBC tissues.
  • Ectopic miR-93 transfection enhanced proliferation, invasion, and metastasis in MCF-7 breast cancer cells.

Conclusions:

  • Distinct miRNA expression patterns differentiate TNBC from other breast cancer subtypes.
  • miR-93 shows potential as a biomarker for TNBC, correlating with biological and clinical features.
  • Further research into miR-93's role could lead to novel therapeutic strategies for TNBC.

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