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Updated: Sep 22, 2025

Genome-wide Screen for miRNA Targets Using the MISSION Target ID Library
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Published on: April 6, 2012

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MicroRNA-409 regulates the proliferation and invasion of breast cancer cell lines by targeting special AT-rich

Zhi Chen1, Mei-Xiang Sang2, Cui-Zhi Geng3

  • 1Department of Anesthesiology, The Fourth Affiliated Hospital of Hebei Medical University, Shijiazhuang, Hebei, China.

Bioengineered
|May 25, 2022
PubMed

Insights

MicroRNA-409 (miR-409) is downregulated in breast cancer and inhibits tumor growth by targeting SATB1. Restoring miR-409 may offer a new therapeutic strategy for breast cancer treatment.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • microRNAs (miRNAs) play crucial roles in cancer development.
  • Dysregulation of specific miRNAs, like miR-409, is implicated in breast cancer progression.
  • Special AT-rich sequence-binding protein 1 (SATB1) is a potential oncogene in various cancers.

Purpose of the Study:

  • To investigate the role of miR-409 in breast cancer.
  • To determine if miR-409 targets SATB1 in breast cancer cells.
  • To explore the clinical significance of the miR-409/SATB1 axis in breast cancer.

Main Methods:

  • Quantitative real-time PCR (RT-qPCR) and Western blot to assess gene and protein expression.
  • Cell Counting Kit-8 (CCK8) and Transwell assays to evaluate cell proliferation and invasion.
  • Transfection of breast cancer cell lines with miR-409 mimics, inhibitors, and SATB1 siRNA.

Main Results:

  • miR-409 expression was significantly lower in breast cancer tissues compared to adjacent normal tissues.
  • miR-409 mimic transfection reduced proliferation and invasion in MDA-MB-453 cells, while miR-409 inhibitor increased these in BT-549 cells.
  • Co-transfection experiments confirmed that miR-409 regulates breast cancer cell proliferation and invasion by targeting SATB1.

Conclusions:

  • miR-409 acts as a tumor suppressor in breast cancer.
  • The miR-409/SATB1 pathway is a critical regulator of breast cancer cell proliferation and invasion.
  • miR-409 represents a potential therapeutic target for breast cancer treatment.
Keywords:
Breast cancerSATB1invasionmiRNA-409proliferation

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