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Mechanisms of androgen receptor activation and function
A O Brinkmann1, L J Blok, P E de Ruiter
1Department of Endocrinology & Reproduction, Erasmus University Rotterdam, The Netherlands. brinkmann@endov.fgg.eur.nl
Summary
Androgen receptor (AR) phosphorylation affects its ability to regulate gene expression. Different anti-androgens induce distinct inactive AR conformations, impacting male development and phenotype maintenance.
Area of Science:
- Molecular Endocrinology
- Cellular Biology
- Genetics
Background:
- Androgens are vital for male development and maintaining the male phenotype.
- Androgen action relies on the androgen receptor (AR), a phosphoprotein that regulates gene expression.
- AR phosphorylation status critically influences ligand binding and transcriptional activity.
Purpose of the Study:
- To elucidate the role of androgen receptor phosphorylation in gene regulation.
- To investigate the conformational changes induced by androgens and anti-androgens.
- To identify the interaction domains within the AR involved in ligand-dependent transactivation.
Main Methods:
- Analysis of androgen receptor phosphorylation.
- Conformational analysis of the ligand-binding domain upon androgen and anti-androgen binding.
- Investigation of functional interactions between AR domains.
Main Results:
- Androgen binding induces conformational changes and additional AR phosphorylation, leading to gene expression.
- Anti-androgens induce distinct inactive AR conformations, with varying effects on transactivation.
- A ligand-dependent interaction between the AR's ligand-binding domain and NH2-terminal domain was confirmed.
Conclusions:
- AR phosphorylation is a key modulator of androgen-responsive gene expression.
- The specific conformation of the AR, dictated by ligand binding, determines its transcriptional activity.
- Understanding these interactions is crucial for comprehending androgen action and developing targeted therapies.