Related Experiment Video
Updated: May 27, 2026
Profiling of Estrogen-regulated MicroRNAs in Breast Cancer Cells
Published on: February 21, 2014
Estradiol-activated estrogen receptor α does not regulate mature microRNAs in T47D breast cancer cells
Anne Katchy1, Karin Edvardsson, Eylem Aydogdu
1Center for Nuclear Receptors and Cell Signaling, Department of Biology and Biochemistry, University of Houston, Houston, TX, USA.
Abstract:
Breast cancers are sensitive to hormones such as estrogen, which binds to and activates estrogen receptors (ER) leading to significant changes in gene expression. microRNAs (miRNA) have emerged as a major player in gene regulation, thus identification of miRNAs associated with normal or disrupted estrogen signaling is critical to enhancing our understanding of the diagnosis and prognosis of breast cancer. We have previously shown that 17β-estradiol (E2) induced activation of ERα in T47D cells results in significant changes in the expression of protein-coding genes involved in cell cycle, proliferation, and apoptosis. To identify miRNAs regulated by E2-activated ERα, we analysed their expression in T47D cells following E2-activation using both dual-color microarrays and TaqMan Low Density Arrays, and validations were carried out by real-time PCR. Although estrogen treatment results in altered expression of up to 900 protein-coding transcripts, no significant changes in mature miRNA expression levels could be confirmed. Whereas previous studies aiming to elucidate the role of miRNA in ER-positive breast cancers cell lines have yielded conflicting results, the work presented here represents a thorough investigation of and significant step forward in our understanding of ERα mediated miRNA regulation.
Insights
This study investigated how estrogen affects microRNAs (miRNAs) in breast cancer cells. Researchers found that while estrogen significantly alters protein-coding genes, it does not appear to change mature miRNA expression levels.
Area of Science:
- Endocrinology
- Molecular Biology
- Oncology
Background:
- Breast cancers often exhibit hormone sensitivity, particularly to estrogen.
- Estrogen receptor (ER) activation by estrogen influences gene expression, impacting cell behavior.
- MicroRNAs (miRNAs) are key regulators of gene expression, crucial for understanding cancer development.
Purpose of the Study:
- To identify specific miRNAs regulated by estrogen receptor alpha (ERα) activation.
- To investigate the role of miRNAs in estrogen-mediated gene regulation in breast cancer.
- To clarify conflicting previous findings on miRNA involvement in ER-positive breast cancers.
Main Methods:
- Utilized T47D breast cancer cells treated with 17β-estradiol (E2) to activate ERα.
- Employed dual-color microarrays and TaqMan Low Density Arrays for miRNA expression analysis.
- Validated findings using real-time polymerase chain reaction (PCR).
Main Results:
- Estrogen treatment led to significant alterations in the expression of numerous protein-coding genes.
- No significant changes were confirmed in the expression levels of mature miRNAs.
- This contrasts with the substantial changes observed in protein-coding gene expression.
Conclusions:
- ERα activation by estrogen significantly impacts protein-coding gene expression but not mature miRNA levels in T47D cells.
- The study provides a comprehensive analysis of ERα-mediated miRNA regulation.
- Findings contribute to a clearer understanding of estrogen signaling pathways in breast cancer.
Related Concept Videos
01:22MicroRNAs
01:22MicroRNAs