A multi-parameter imaging assay identifies different stages of ligand-induced androgen receptor activation

Martin van Royen, Dennis Wijngaart, Sonia Cunha, Jan Trapman, Adriaan Houtsmuller

Research output: Contribution to journalArticleAcademicpeer-review

8 Citations (Scopus)

Abstract

Androgens exert their key function in development and maintenance of the male phenotype via the androgen receptor (AR). Ligand-activated ARs also play a role in prostate cancer. Despite initial success of treatment by testosterone depletion or blocking of androgen binding to the AR using antiandrogens, eventually all tumors escape to a therapy resistant stage. Development of novel therapies by other antagonistic ligands or compounds that target events subsequent to ligand binding is very important. Here, we validate a fluorescence resonance energy transfer (FRET) based imaging assay for ligand-induced AR activity, based on the conformational change in the AR caused by interaction between the FQNLF motif in the N-terminal domain and the cofactor binding groove in the ligand-binding domain (N/C-interaction). We test the assay using known agonistic and antagonistic ligands on wild type AR and specific AR mutants. Our data show a strong correlation between the ligand-induced AR N/C-interaction and transcriptional activity in wild type AR, but also in AR mutants with broadened ligand responsiveness. Moreover, we explore additional readouts of this assay that contribute to the understanding of the working mechanism of the ligands. Together, we present a sensitive assay that can be used to quantitatively assess the activity of agonistic and antagonistic AR ligands. (c) 2013 International Society for Advancement of Cytometry
Original languageUndefined/Unknown
Pages (from-to)806-817
Number of pages12
JournalCytometry Part A
Volume83
Issue number9
DOIs
Publication statusPublished - 2013

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