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Cooperativity and equilibrium with FOXA1 define the androgen receptor transcriptional program. Nat Commun 2014;5:3972 (0)

by H-J Jin, Zhao JC, L Wu, J Kim, J Yu
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Chromatin, Gene, and RNA Regulation The lncRNA DRAIC/PCAT29 Locus Constitutes a

by Kouhei Sakurai, Brian J. Reon, Jordan Anaya, Anindya Dutta
"... Long noncoding RNAs (lncRNA) are emerging as major reg-ulators of cellular phenotypes and implicated as oncogenes or tumor suppressors. Here, we report a novel tumor-suppressive locus on human chromosome 15q23 that contains two multi-exonic lncRNA genes of 100 kb each: DRAIC (LOC145837) and the rece ..."
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Long noncoding RNAs (lncRNA) are emerging as major reg-ulators of cellular phenotypes and implicated as oncogenes or tumor suppressors. Here, we report a novel tumor-suppressive locus on human chromosome 15q23 that contains two multi-exonic lncRNA genes of 100 kb each: DRAIC (LOC145837) and the recently reported PCAT29. The DRAIC lncRNA was identified from RNA-seq data and is downregulated as prostate cancer cells progress from an androgen-dependent (AD) to a castration-resis-tant (CR) state. Prostate cancers persisting in patients after andro-gen deprivation therapy (ADT) select for decreasedDRAIC expres-sion, and higher levels ofDRAIC in prostate cancer are associated with longer disease-free survival (DFS). Androgen induced andro-gen receptor (AR) binding to the DRAIC locus and repressed DRAIC expression. In contrast, FOXA1 and NKX3-1 are recruited to the DRAIC locus to induce DRAIC, and FOXA1 specifically counters the repression of DRAIC by AR. The decrease of FOXA1 and NKX3-1, and aberrant activation of AR, thus accounts for the decrease of DRAIC during prostate cancer progression to the CR state. Consistent with DRAIC being a good prognostic marker, DRAIC prevents the transformation of cuboidal epithelial cells to fibroblast-like morphology and prevents cellular migration and invasion. A second tumor-suppressive lncRNA PCAT29, located 20 kb downstream of DRAIC, is regulated identically by AR and FOXA1 and also suppresses cellular migration and metastasis. Finally, based on TCGA analysis,DRAIC expression predicts good prognosis in a wide range of malignancies, including bladder cancer, low-grade gliomas, lung adenocarcinoma, stomach ade-nocarcinoma, renal clear cell carcinoma, hepatocellular carcino-ma, skin melanoma, and stomach adenocarcinoma. Implications: This study reveals a novel tumor-suppressive locus encoding two hormone-regulated lncRNAs, DRAIC and PCAT29, that are prognostic for a wide variety of cancer types. Mol Cancer Res; 13(5); 828–38. 2015 AACR.
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.... Indeed, siRNA against FOXA1 or NKX3-1 decreased PCAT29 expression (Figs. 5F and Fig. 4F). Jin and colleagues recently reported that FOXA1 knockdown can shift or increase ARbinding to selected sites =-=(30)-=-.We analyzed their AR ChIP-seq data and found that shFOXA1 increases AR recruitment at DRAIC/PCAT29 cluster (Fig. 5G). Thus, FOXA1 actually decreases the recruitment of AR to the DRAIC/PCAT29 locus. C...

Review Roles of Ubiquitination and SUMOylation on Prostate Cancer: Mechanisms and Clinical Implications

by Zhenbang Chen, Wenfu Lu
"... Abstract: The initiation and progression of human prostate cancer are highly associated with aberrant dysregulations of tumor suppressors and proto-oncogenes. Despite that deletions and mutations of tumor suppressors and aberrant elevations of oncogenes at the genetic level are reported to cause can ..."
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Abstract: The initiation and progression of human prostate cancer are highly associated with aberrant dysregulations of tumor suppressors and proto-oncogenes. Despite that deletions and mutations of tumor suppressors and aberrant elevations of oncogenes at the genetic level are reported to cause cancers, emerging evidence has revealed that cancer progression is largely regulated by posttranslational modifications (PTMs) and epigenetic alterations. PTMs play critical roles in gene regulation, cellular functions, tissue development, diseases, malignant progression and drug resistance. Recent discoveries demonstrate that ubiquitination and SUMOylation are complicated but highly-regulated PTMs, and make essential contributions to diseases and cancers by regulation of key factors and signaling pathways. Ubiquitination and SUMOylation pathways can be differentially modulated under various stimuli or stresses in order to produce the sustained oncogenic potentials. In this review, we discuss some new insights about molecular mechanisms on ubiquitination and SUMOylation, their associations with diseases, oncogenic impact on prostate cancer (PCa) and clinical implications for PCa treatment.
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...AR facilitates PCa progression [91–93]. However several lines of evidence pinpoint that FOXA1sloss also contributes to PCa by mediating the chromatin binding through androgen response elementss(AREs) =-=[94,95]-=-. Most recent studies report that the SUMOylation of FOXA1 protein at lysine residuess6, 267 and 389 affects its nuclear mobility to regulate transcriptional activity of AR [87].sSENP1 and SENP2 are r...

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