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Updated: Aug 5, 2025
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Systems Biology of Metabolic Regulation by Estrogen Receptor Signaling in Breast Cancer
Published on: March 17, 2016
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Significant Association of Estrogen Receptor-β Isoforms and Coactivators in Breast Cancer Subtypes
1Department of Pathology, Yale School of Medicine, 434 Pine Grove Lane, Hartsdale, NY 10530, USA.
Current Issues in Molecular Biology
|March 28, 2023
Summary
Estrogen Receptor beta (ERβ) isoforms and coactivators drive breast cancer progression. Targeting these coregulators may offer new therapeutic strategies for ERβ-expressing breast cancer.
Area of Science:
- Molecular Biology
- Oncology
- Biochemistry
Background:
- Nuclear receptor coregulators are key regulators of Estrogen Receptor (ER)-mediated transcription.
- Estrogen Receptor beta (ERβ) is linked to adverse outcomes in breast cancer (BCa) subtypes.
- Coexpression of ERβ1, AIB-1, and TIF-2 in BCa myofibroblasts correlates with high-grade tumors.
Purpose of the Study:
- To identify specific coactivators involved in the progression of ERβ-expressing breast cancer.
- To investigate the relationship between ERβ isoforms, coactivators, and prognostic markers in BCa.
Main Methods:
- Immunohistochemistry was used to assess ERβ isoforms, coactivators, and prognostic markers.
- Differential correlation analysis was performed between ERβ isoform expression and coactivators (AIB-1, TIF-2, NF-kB, p-c-Jun, cyclin D1).
Main Results:
- Specific coactivators (AIB-1, TIF-2, NF-kB, p-c-Jun, cyclin D1) showed differential correlations with ERβ isoform expression in BCa subtypes.
- Coexpression of ERβ5/ERβ1 isoforms with coactivators correlated with high P53, Ki-67, Her2/neu expression, and larger, high-grade tumors.
Conclusions:
- ERβ isoforms and coactivators appear to coregulate breast cancer proliferation and progression.
- These findings suggest potential therapeutic applications for coactivators in treating ERβ-expressing breast cancer.
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