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Regulation of androgen receptor signaling by Oct1 recruitment in prostate cancer

ABSTRACT: Prostate cancer is the most common cancer in men and AR downstream signalings promote prostate cancer cell proliferation. To investigate the AR signaling, we performed ChIP sequence analysis in AR-positive prostate cancer cell lines, LNCaP and VCaP. In addition, we also examined the effect of PI polyamide specificly inhibit Oct1 binding to AR occupied-regions.

ORGANISM(S): Homo sapiens

PROVIDER: GSE77770 | GEO | 2016/04/01

SECONDARY ACCESSION(S): PRJNA311511

REPOSITORIES: GEO

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Regulation of androgen receptor signaling by Oct1 recruitment in prostate cancer

Project description:Prostate cancer is the most common cancer in men and AR downstream signalings promote prostate cancer cell proliferation. To investigate the AR signaling, we performed ChIP sequence analysis in AR-positive prostate cancer cell lines, LNCaP and VCaP. In addition, we also examined the effect of PI polyamide specificly inhibit Oct1 binding to AR occupied-regions. ChIP sequence analysis of AR binding sites and epigenetic condition in two prostate cancer cells

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Single-minded homolog 2 resides in the chromatin protein network of androgen receptor and modulates gene expression in prostate cancer cells Single-minded homolog 2 resides in the chromatin protein network of androgen receptor and modulates gene expression in prostate cancer cells

Project description:We investigated the composition of chromatin protein network around endogenous androgen receptor (AR) in VCaP castration resistant prostate cancer cells using recently developed chromatin-directed proteomic approach called ChIP-SICAP . The androgen-induced AR chromatin protein network contained expected TFs, e.g. HOXB13, chromatin remodeling proteins, e.g. SMARCA4, and several novel candidates not previously associated with AR, e.g. prostate cancer biomarker SIM2. Based on these findings, the role of SMARCA4 and SIM2 was further characterized at AR chromatin domains . Silencing of SIM2 altered chromatin accessibility at a similar number of AR-binding sites as SMARCA4, an established ATPase subunit of the BAF chromatin remodeling complex, often aberrantly expressed in prostate cancer. Despite the wide co-occurrence on chromatin of SMARCA4 and AR, depletion of SMARCA4 influenced chromatin accessibility and expression of a restricted set of AR target genes, in particular those involved in cell morphogenetic changes in epithelial-mesenchymal transition. Silencing of SIM2, in turn, affected the expression of a much larger group of androgen-regulated genes, e.g. those involved in cellular responses to external stimuli and steroid hormone stimulus. The silencing also reduced proliferation of VCaP cells and tumor size in chick embryo chorioallantoic membrane assay, further suggesting the importance of SIM2 in the regulation prostate cancer cells.

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