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Clinicopathological Analysis of miRNA Expression in Breast Cancer Tissues by Using miRNA In Situ Hybridization
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HIC1 and miR-23~27~24 clusters form a double-negative feedback loop in breast cancer

Yanbo Wang1, Hongwei Liang1, Geyu Zhou1

  • 1State Key Laboratory of Pharmaceutical Biotechnology, Jiangsu Engineering Research Center for MicroRNA Biology and Biotechnology, NJU Advanced Institute for Life Sciences (NAILS), School of Life Sciences, Nanjing University, 163 Xianlin Avenue, Nanjing 210046, Jiangsu, China.

Cell Death and Differentiation
|December 24, 2016
PubMed

Insights

MicroRNAs (miRNAs) in the miR-23~27~24 cluster act as oncogenes in breast cancer by targeting HIC1. A feedback loop between these miRNAs and HIC1 regulates tumor growth.

Area of Science:

  • Molecular Biology
  • Oncology
  • Genetics

Background:

  • MicroRNAs (miRNAs) are key regulators in human cancers, including breast cancer.
  • The cooperative functions and transcriptional control of miRNA clusters are not well understood.

Purpose of the Study:

  • Investigate the role of miR-23~27~24 clusters in breast cancer.
  • Elucidate the regulatory relationship between miR-23~27~24 clusters and HIC1.

Main Methods:

  • Expression analysis of miR-23~27~24 clusters and HIC1 in breast cancer.
  • Functional studies on miRNA overexpression and HIC1 restoration in vivo.
  • Development of a mathematical model for the regulatory circuit.

Main Results:

  • All members of the miR-23~27~24 clusters are upregulated and function as oncogenes in breast cancer.
  • These miRNAs cooperatively target HIC1, which acts as a transcriptional repressor of the miRNA cluster.
  • A positive feedback loop between the miR-23~27~24 clusters and HIC1 was identified, impacting tumor growth.

Conclusions:

  • The miR-23~27~24 clusters play a cooperative oncogenic role in breast cancer.
  • The HIC1-miRNA feedback loop is a critical regulatory pathway in breast cancer progression.
  • Findings add complexity to miRNA regulatory networks and offer insights into breast cancer mechanisms.

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