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Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
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Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells

Published on: February 21, 2014

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Differential microRNA expression profiles in tamoxifen-resistant human breast cancer cell lines induced by two

Peng Ye1, Cheng Fang1, Hui Zeng1

  • 1Department of Laboratory Medicine, Zhongnan Hospital of Wuhan University, Wuhan, Hubei 430071, P.R. China.

Oncology Letters
|February 23, 2018
PubMed

Insights

Tamoxifen resistance in breast cancer is a major challenge. This study identifies specific microRNAs (miRNAs) linked to tamoxifen resistance, suggesting potential new therapeutic targets for resistant breast cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Tamoxifen (TAM) resistance poses a significant obstacle in endocrine therapy for breast cancer.
  • Understanding the molecular mechanisms underlying TAM resistance is crucial for developing effective treatment strategies.

Purpose of the Study:

  • To investigate the association between microRNA (miRNA) expression profiles and tamoxifen (TAM) resistance in breast cancer.
  • To identify specific miRNAs that may play a role in mediating TAM resistance.

Main Methods:

  • Established tamoxifen-resistant breast cancer cell lines (MCF-7C and MCF-7T) from parental MCF-7 cells using 4-hydroxytamoxifen (OHT) in vitro.
  • Analyzed differential miRNA expression profiles between sensitive and resistant cell lines using RNA sequencing technology.
  • Confirmed ERα protein expression levels using western blot analysis.

Main Results:

  • Identified significant differences in miRNA expression between TAM-sensitive and TAM-resistant cell lines.
  • Detected 118 differentially expressed miRNAs between MCF-7C and MCF-7 cells, and 42 between MCF-7T and MCF-7 cells.
  • Observed increased ERα protein expression in drug-resistant cells.

Conclusions:

  • Hypothesize that specific miRNAs, including miR-21, miR-146a, miR-148a, miR-34a, and miR-27a, are involved in mediating TAM resistance in breast cancer.
  • These identified miRNAs represent potential therapeutic targets for overcoming tamoxifen resistance in breast cancer patients.
Keywords:
MCF-7breast cancermicroRNAresistancetamoxifen

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