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Learn MoreAndrogen receptor (AR) is typically overexpressed in castration-resistant prostate cancer (CRPC). CRPC-derived VCaP cells display an excessive number of chromatin AR-binding sites (ARBs). This study analyzed direct transcription programs of the AR, the prevalence of AR enhancers and the transcriptional regulators involved in the regulation of at the enhancer regions. The analysis utilized global nuclear run-on sequencing (GRO-seq). The GRO-seq data were integrated with the ARB and VCaP cell-specific transcription factor-binding data. Androgen in 30 min activated and repressed transcription of a large number of genes including novel AR targets IGF-1 receptor and EGF receptor. GRO-seq analysis also revealed that only a fraction of the ARBs resides at functional enhancers. Activation of AR bound enhancers was most potent at the sites that also bound PIAS1, ERG and HDAC3. Our genome-wide data provide new insights how AR can directly control growth-signaling pathways in CPRC cells. SOURCE: Sari Toropainen (sari.toropainen@uef.fi) - Biomedicine University of Eastern Finland
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