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Dissecting transcription of the 8q24-MYC locus in prostate cancer recognizes the equilibration between androgen receptor direct and indirect dual-functions

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单位: [1]Department of Urology, The First Afliated Hospital of Nanchang University, Yongwai Street 17, Nanchang 330006, China [2]Department of Clinical Laboratory, Qilu Hospital of Shandong University, Jinan 250012, Shandong, China [3]Department of Clinical Laboratory, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan 250033, Shandong, China [4]Shandong Engineering & Technology Research Center for Tumor Marker Detection, Jinan 250033, Shandong, China [5]Shandong Provincial Clinical Medicine Research Center for Clinical Laboratory, Jinan 250033, Shandong, China [6]Hematology-Oncology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA [7]Department of Cell Development Biology, College of Life Sciences, Shaanxi Normal University, Xi’an 710119, ShanXi, China [8]Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, 615 North Wolfe Street, Baltimore, MD 21205, USA [9]Department of Urology, Wuhan No.1 Hospital, No.215 Zhongshan Avenue, Wuhan, China [10]Institute of Biology and Medicine, College of Life and Health Sciences, Wuhan University of Science and Technology, No.947, Heping Avenue, Qingshan District, WuHan 430081, Hubei, China [11]Department of Urology,Tongji Hospital,Tongji Medical College,Huazhong University of Science and Technology,1095 Jiefang Avenue,Wuhan 430030,Hubei,China [12]Center for Medical Epigenetics, School of Basic Medical Sciences, Chongqing Medical University, 1 Yixueyuan Road, Chongqing 400016, People’s Republic of China [13]Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, China [14]Institute of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, China
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关键词: Androgen receptor Transcriptional dual-functions 8q24-MYC locus AR binding sites CRIPSR/Cas9 genomic knock-out Co-factor redistribution Prostate cancer

摘要:
Androgen receptor (AR) activation and repression dual-functionality only became known recently and still remains intriguing in prostate cancer (PCa). MYC is a prominent oncogene that functionally entangles with AR signaling in PCa. Further exploration of AR regulatory mechanisms on MYC gene transcription bears clinical and translation significance.Bioinformatics analysis of PCa cell line and clinical RNA-Seq and ChIP-Seq (chromatin immunoprecipitation-sequencing) datasets to anchor interactions of AR and MYC transcriptional networks. ChIP-qPCR and 3C (chromosome conformation capture) analyses to probe MYC distal regulation by AR binding sites (ABSs). CRISPR/Cas9-mediated genome-editing to specify functions of ABS within the 8q24-MYC locus on androgen-mediated MYC transcription. Global FoxA1 and HoxB13 distribution profiling to advance AR transcriptional mechanisms.Here we recognize AR bi-directional transcription mechanisms by exploiting the prominent 8q24-MYC locus conferring androgen hyper-sensitivity. At ~ 25 Kb downstream of the MYC gene, we identified an undefined ABS, P10. By chromatin analyses, we validated androgen-dependent spatial interaction between P10 and MYC-Promoter (MYC-Pro) and temporal epigenetic repression of these MYC-proximal elements. We next designed a CRISPR/Cas9-mediated double genomic knock-out (KO) strategy to show that P10-KO slightly lessened androgen-elicited MYC transrepression in LNCaP-AR cells. In similar genomic editing assays, androgen-mediated MYC repression became slightly deepened upon KO of P11, an ABS in the PVT1 gene locus highly enriched in AR-binding motifs and peaks. We also investigated multiple ABSs in the established PCAT1 super-enhancer that distally interacts with MYC-Pro for transactivation, with each KO pool consistently shown to relieve androgen-elicited MYC repression. In the end, we systemically assessed androgen effects in the 8q24-MYC locus and along PCa genome to generalize H3K27ac and BRD4 re-distribution from pioneer factors (FoxA1 and HoxB13) to AR sites.Together, we reconciled these observations by unifying AR dual-functions that are mechanistically coupled to and equilibrated by co-factor redistribution.© 2023. BioMed Central Ltd., part of Springer Nature.

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大类 | 2 区 医学
小类 | 2 区 医学:研究与实验
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大类 | 2 区 医学
小类 | 2 区 医学:研究与实验
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Q1 MEDICINE, RESEARCH & EXPERIMENTAL
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Q1 MEDICINE, RESEARCH & EXPERIMENTAL

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第一作者单位: [1]Department of Urology, The First Afliated Hospital of Nanchang University, Yongwai Street 17, Nanchang 330006, China
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通讯机构: [1]Department of Urology, The First Afliated Hospital of Nanchang University, Yongwai Street 17, Nanchang 330006, China [6]Hematology-Oncology Division, Department of Medicine, Beth Israel Deaconess Medical Center and Harvard Medical School, Boston, MA 02215, USA [13]Department of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, China [14]Institute of Urology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, 1277 Jiefang Avenue, Wuhan 430022, China
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