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Updated: Jul 14, 2025

Systems Biology of Metabolic Regulation by Estrogen Receptor Signaling in Breast Cancer
Published on: March 17, 2016
Optimization of small molecule degraders and antagonists for targeting estrogen receptor based on breast cancer:
Jiaqi Yao1,2, Yiran Tao3, Zelin Hu1,2
1General Practice Ward/International Medical Center, General Practice Medical Center, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
Abstract:
The estrogen receptor (ER) is a classical receptor protein that plays a crucial role in mediating multiple signaling pathways in various target organs. It has been shown that ER-targeting therapies inhibit breast cancer cell proliferation, enhance neuronal protection, and promote osteoclast formation. Several drugs have been designed to specifically target ER in ER-positive (ER+) breast cancer, including selective estrogen receptor modulators (SERM) such as Tamoxifen. However, the emergence of drug resistance in ER+ breast cancer and the potential side effects on the endometrium which has high ER expression has posed significant challenges in clinical practice. Recently, novel ER-targeted drugs, namely, selective estrogen receptor degrader (SERD) and selective estrogen receptor covalent antagonist (SERCA) have shown promise in addressing these concerns. This paper provides a comprehensive review of the structural functions of ER and highlights recent advancements in SERD and SERCA-related small molecule drugs, especially focusing on their structural optimization strategies and future optimization directions. Additionally, the therapeutic potential and challenges of novel SERDs and SERCAs in breast cancer and other ER-related diseases have been discussed.
Insights
Novel drugs targeting the estrogen receptor (ER) show promise for treating ER-positive breast cancer. Selective estrogen receptor degraders (SERDs) and covalent antagonists (SERCAs) offer new therapeutic avenues beyond traditional SERMs.
Area of Science:
- Endocrinology
- Oncology
- Medicinal Chemistry
Background:
- The estrogen receptor (ER) is vital in physiological processes and ER-positive (ER+) breast cancer.
- ER-targeting therapies like Tamoxifen (a SERM) are established but face challenges like drug resistance and side effects.
- Novel ER-targeting agents, SERDs and SERCAs, are emerging to overcome these limitations.
Purpose of the Study:
- To review the structural functions of the estrogen receptor.
- To highlight advancements in SERD and SERCA small molecule drugs.
- To discuss therapeutic potential and future directions for ER-targeted therapies in breast cancer and other ER-related diseases.
Main Methods:
- Comprehensive literature review of ER structure-function relationships.
- Analysis of recent developments in SERD and SERCA small molecule drug design.
- Discussion of clinical applications and challenges of novel ER-targeted agents.
Main Results:
- ER plays a critical role in various tissues, including breast cancer.
- SERDs and SERCAs demonstrate potential in overcoming resistance and side effects associated with SERMs.
- Structural optimization strategies for SERDs and SERCAs are crucial for enhancing efficacy.
Conclusions:
- Novel SERDs and SERCAs represent a significant advancement in ER-targeted therapy for breast cancer.
- Further research into structural optimization and therapeutic applications is warranted.
- These agents hold promise for treating various ER-related diseases beyond breast cancer.
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