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Updated: Jan 27, 2026
09:29
Studying Triple Negative Breast Cancer Using Orthotopic Breast Cancer Model
Published on: March 20, 2020
18.8K
Modulation of Mitochondrial ERβ Expression Inhibits Triple-Negative Breast Cancer Tumor Progression by Activating
In-Sung Song1, Yu Jeong Jeong1, Seung Hun Jeong1
1Department of Biomedical Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul, Korea.
Summary
Estrogen receptor beta (ERβ) found in mitochondria may be a new target for triple-negative breast cancer (TNBC) treatment. Upregulating mitochondrial ERβ (mitoERβ) inhibits TNBC growth and enhances ATP production, offering potential therapeutic strategies.
Area of Science:
- Molecular biology
- Cancer research
- Mitochondrial biology
Background:
- Triple-negative breast cancer (TNBC) presents poorer outcomes due to limited targeted therapies.
- Estrogen receptor beta (ERβ) is explored as a novel mitochondrial target in TNBC.
Purpose of the Study:
- Identify ERβ as a mitochondrial target in TNBC cells.
- Elucidate the mechanisms underlying ERβ's role in TNBC.
Main Methods:
- Assessed ERβ expression in clinical breast samples (qRT-PCR, IHC, immunoblotting).
- Investigated ERβ-Grp75 interaction and mitochondrial translocation (confocal microscopy, co-IP).
- Evaluated effects of mitochondrial ERβ (mitoERβ) on cell proliferation, cell cycle, mitochondrial function, and tumorigenesis in vitro and in vivo.
Main Results:
- Lower ERβ expression in tumors correlated with increased recurrence.
- mitoERβ overexpression inhibited TNBC cell proliferation and tumor growth in mice.
- mitoERβ enhanced ATP production, linked to mitochondrial transcription and OXPHOS activation.
Conclusions:
- mitoERβ up-regulation in TNBC cells promotes mitochondrial transcription and OXPHOS, boosting ATP production.
- mitoERβ's role in mitochondrial activity may predict recurrence and identify new therapeutic targets for TNBC.
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