Androgen receptor: structural domains and functional dynamics after ligand-receptor interaction

Area of Science:

• Endocrinology
• Molecular Biology
• Genetics

Background:

• Androgens are C-19 steroids vital for reproductive functions, acting via the androgen receptor (AR), a nuclear receptor.
• AR regulates diverse physiological processes, including cell proliferation and apoptosis, by controlling gene expression.

Purpose of the Study:

• To describe the genomic organization and functional roles of AR structural domains.
• To investigate the influence of ligands on AR intracellular movement and transcriptional activity.
• To elucidate the mechanism of AR nucleocytoplasmic recycling and modulation by SARMs.

Main Methods:

• Analysis of AR genomic organization and domain functions.
• Study of AR translocation, clustering, and transcriptional activity in response to ligands.
• Investigation of AR nucleocytoplasmic recycling dynamics.

Main Results:

• The AR undergoes ligand-dependent nuclear translocation and subnuclear clustering to regulate target gene transcription.
• AR exhibits multiple rounds of nucleocytoplasmic recycling upon ligand binding and dissociation.
• Selective androgen receptor modulators (SARMs) can inhibit AR nuclear translocation or subnuclear clustering, thereby modulating AR activity.

Conclusions:

• AR structure and ligand interactions dictate its function in gene regulation.
• AR nucleocytoplasmic shuttling is a dynamic process critical for its activity.
• SARMs offer a means to selectively modulate AR-mediated signaling pathways.