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DNA methylation profiling of normal prostates and prostate cancer metastases [Illumina]

ABSTRACT: DNA methylation profiling of normal prostates from organ donors and prostate cancer metastases from a rapid autopsy cohort of lethal metastatic prostate cancer

ORGANISM(S): Homo sapiens

PROVIDER: GSE38240 | GEO | 2013/02/04

SECONDARY ACCESSION(S): PRJNA167585

REPOSITORIES: GEO

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DNA methylation profiling of normal prostates and prostate cancer metastases [Illumina]

Project description:DNA methylation profiling of normal prostates from organ donors and prostate cancer metastases from a rapid autopsy cohort of lethal metastatic prostate cancer Metastases from prostate cancer patients. Normal prostate samples from organ donors

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Comparison of gene expression in ventral prostates of 12 week old AR-E231G mice with AR-T857A mice

Project description:The androgen receptor (AR) is an androgen-activated nuclear receptor. The androgen signaling axis is critical in all stages of prostate cancer, although the mechanism by which it contributes to tumorigenesis remains unclear. Mutations in the AR have been detected in prostate tumors; one such mutant, E231G, exhibits increased ligand sensitivity in the presence of specific cofactors. Mice with prostate-specific expression of AR-E231G invariably develop prostatic intraepithelial neoplasia (PIN) by 12 weeks, and metastatic prostate cancer by 52 weeks. To determine a potential mechanism of AR-driven tumorigenesis in AR-E231G mice, we compared gene expression profiles in prostates of 12 week old AR-E231G mice with another AR-variant mouse strain (AR-T857A) that does not develop tumors. Pathway classification of the 132 candidate genes differentially expressed in AR-E231G mouse prostates compared to AR-T857A mouse prostates revealed enrichment for groups important in prostate cancer, including “cancer,” “fatty acid metabolism” and “cell cycle” pathways. Two genes significantly upregulated in the AR-E231G model were Adm and Cited1. siRNA suppression of ADM and CITED1 expression by up to 63% and 79%, respectively, in LNCaP human prostate cancer cells, resulted in an approximate 1.8-fold increase in cell death. Cell proliferation was reduced by 35% when CITED1 mRNA expression was suppressed, but not significantly altered by ADM suppression. A gene signature set derived from this model was able to distinguish between primary Gleason grade 3 and Gleason grade 4 tumors (p=0.04237), and between human non-malignant and cancerous prostate in a test (p=0.02352) and validation cohort (p=7.53x10-9), highlighting the relevance of the AR-E231G model to the human disease.

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