A high-affinity subtype-selective fluorescent probe for estrogen receptor β imaging in living cells

Area of Science:

• Biochemistry
• Molecular Biology
• Oncology

Background:

• Estrogen receptor beta (ERβ) is a potential therapeutic target for hormone replacement therapy in breast cancers.
• The precise biological role of ERβ in cancer progression is not fully understood.
• Targeting ERβ requires selective molecular tools to study its function in disease contexts.

Purpose of the Study:

• To develop a highly selective fluorescent probe for intracellular ERβ.
• To visualize and analyze ERβ dynamics in cancer cells.
• To investigate the biological function of ERβ in disease progression.

Main Methods:

• Discovery and characterization of a novel ERβ-selective fluorescent probe (FPNM).
• Assessment of FPNM affinity and selectivity for ERβ over ERα (ERβ/ERα selectivity ratio of 80).
• Application of FPNM for direct visualization of intracellular ERβ in prostate cancer (DU-145) and triple-negative breast cancer (MDA-MB-231) cells.

Main Results:

• FPNM demonstrated nanomolar affinity for ERβ.
• High ERβ/ERα selectivity (80-fold) enabled specific intracellular ERβ labeling.
• Distinct ERβ dynamics were directly observed in DU-145 and MDA-MB-231 cells for the first time.

Conclusions:

• The FPNM probe is a valuable tool for specific ERβ detection and imaging.
• Direct observation of ERβ dynamics provides novel insights into its cellular behavior in cancer.
• Further research using FPNM can elucidate ERβ's role in cancer and guide therapeutic strategies.