Abstract
Background
Androgen receptor (AR) ligand-binding domain (LBD) mutations occur in ~20% of all castration-resistant prostate cancer (CRPC) patients. These mutations confer ligand promiscuity, but the affinity for many steroid hormone pathway intermediates is unknown. In this study, we investigated the stimulation of clinically relevant AR-LBD mutants by endogenous and exogenous steroid hormones present in CRPC patients to unravel their potential contribution to AR pathway reactivation.
Methods
A meta-analysis of studies reporting untargeted analysis of AR mutants was performed to identify clinically relevant AR-LBD mutations. Using luciferase reporter and quantitative fluorescent microscopy, these AR mutants were screened for sensitivity for various endogenous steroids and synthetic glucocorticoids used in the treatment of CRPC.
Results
The meta-analysis revealed that ARL702H (3.4%), ARH875Y (4.9%), and ART878A (4.4%) were the most prevalent AR-LBD mutations across 1614 CRPC patients from 21 unique studies. Testosterone (EC50: 0.22 nmol/L) and 11-ketotestosterone (11KT, EC50: 0.74 nmol/L) displayed subnanomolar affinity for ARWT. The p.H875Y mutation selectively increased sensitivity of the AR for 11KT (EC50: 0.15 nmol/L, pā<ā0.05 vs ARWT), whereas p.L702H decreased sensitivity for 11KT by almost 50-fold. While cortisol and prednisolone both stimulate ARL702H, dexamethasone importantly does not.
Conclusion
Both testosterone and 11KT effectively contribute to ARWT activation, while selective sensitization positions 11KT as a more prominent activator of ARH875Y. Dexamethasone may be a suitable alternative to prednisolone and should be explored in patients bearing the ARL702H.
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Data availability
The studies included meta-analysis were retrieved from PubMed and are publicly available. The data sets generated during the present study are available from the corresponding author upon reasonable request.
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Funding
This study was funded by the Daniel den Hoed Foundation (investigator award to JH and funding support for the CTSF/Opera Phenix system) and by royalties from AMH assays paid to the Visser lab (JAV).
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Statement Conceptualization GS, MEvR, JAV, JH Methodology WMvW PJF, JWJ, ABH MEvR Validation GS, RM, MEvR Formal analysis GS Investigation GS, RM, MEvR Resources WMvR, PJF, JWJ, MEvR, JAV Writing original draft GS Writingāreview & editing All authors Visualization GS Supervision JAV, JH Project administration JAV, JH Funding acquisition PJF, JAV, JH.
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Snaterse, G., Mies, R., van Weerden, W.M. et al. Androgen receptor mutations modulate activation by 11-oxygenated androgens and glucocorticoids. Prostate Cancer Prostatic Dis 26, 293ā301 (2023). https://doi.org/10.1038/s41391-022-00491-z
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DOI: https://doi.org/10.1038/s41391-022-00491-z
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