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Song H, Sun N, Lin L, Wei S, Zeng K, Liu W, Wang C, Zhong X, Wang M, Wang S, Zhou B, Lv C, Liu W, Zhao Y. Splicing factor PRPF6 upregulates oncogenic androgen receptor signaling pathway in hepatocellular carcinoma. Cancer Sci 2020; 111:3665-3678. [PMID: 32745318 PMCID: PMC7540998 DOI: 10.1111/cas.14595] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 07/20/2020] [Accepted: 07/22/2020] [Indexed: 02/06/2023] Open
Abstract
Androgen receptor (AR) signaling is considered to be crucial for the pathogenesis of hepatocellular carcinoma (HCC) with obvious sexual dimorphism. Pre‐mRNA processing factor 6 (PRPF6) was identified as a coactivator of AR. However, the molecular mechanism underlying the modulation function of PRPF6 on AR‐mediated transcriptional activity in HCC needs to be further clarified. In this study, we analyzed data from The Cancer Genome Atlas to show that PRPF6 is highly expressed in HCC. . Our data indicated that PRPF6 interacts with AR/AR splice variants (AR‐Vs) and upregulates AR/AR splice variant 7‐mediated transcriptional activity even without dihydrotestosterone treatment. We observed that AR is obviously induced by androgen treatment and is mainly expressed in the nucleus in HCC‐derived cell lines. Moreover, overexpression of PRPF6 enhances AR expression accompanied with the increase of AR‐Vs expression. We provided evidence that PRPF6 participates in upregulating AR self‐transcription. PRPF6 facilitates the recruitment of AR to the androgen responsive element region of the AR gene. Finally, PRPF6 depletion inhibits cell proliferation in HCC cells and mouse xenografts. Taken together, our results suggest that PRPF6 as a splicing factor enhances AR self‐transcription, thereby coactivating oncogenic AR/AR‐Vs actions in HCC.
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Affiliation(s)
- Huijuan Song
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Ning Sun
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Lin Lin
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Shan Wei
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Kai Zeng
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Wei Liu
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Chunyu Wang
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Xinping Zhong
- Department of General Surgery, The First Affiliated Hospital of China Medical University, Shenyang City, China
| | - Manlin Wang
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Shengli Wang
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Baosheng Zhou
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Chi Lv
- Department of General Surgery, Shengjing Hospital of China Medical University, Shenyang City, China
| | - Wensu Liu
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China
| | - Yue Zhao
- Department of Cell Biology, Key Laboratory of Cell Biology, Ministry of Public Health, and Key Laboratory of Medical Cell Biology, Ministry of Education, School of Life Sciences, China Medical University, Shenyang City, China.,Department of Endocrinology and Metabolism, Institute of Endocrinology, The First Affiliated Hospital of China Medical University, Shenyang City, China
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Stelloo S, Nevedomskaya E, Kim Y, Hoekman L, Bleijerveld OB, Mirza T, Wessels LFA, van Weerden WM, Altelaar AFM, Bergman AM, Zwart W. Endogenous androgen receptor proteomic profiling reveals genomic subcomplex involved in prostate tumorigenesis. Oncogene 2017; 37:313-322. [PMID: 28925401 DOI: 10.1038/onc.2017.330] [Citation(s) in RCA: 64] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 07/10/2017] [Accepted: 08/06/2017] [Indexed: 12/13/2022]
Abstract
Androgen receptor (AR) is a key player in prostate cancer development and progression. Here we applied immunoprecipitation mass spectrometry of endogenous AR in LNCaP cells to identify components of the AR transcriptional complex. In total, 66 known and novel AR interactors were identified in the presence of synthetic androgen, most of which were critical for AR-driven prostate cancer cell proliferation. A subset of AR interactors required for LNCaP proliferation were profiled using chromatin immunoprecipitation assays followed by sequencing, identifying distinct genomic subcomplexes of AR interaction partners. Interestingly, three major subgroups of genomic subcomplexes were identified, where selective gain of function for AR genomic action in tumorigenesis was found, dictated by FOXA1 and HOXB13. In summary, by combining proteomic and genomic approaches we reveal subclasses of AR transcriptional complexes, differentiating normal AR behavior from the oncogenic state. In this process, the expression of AR interactors has key roles by reprogramming the AR cistrome and interactome in a genomic location-specific manner.
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Affiliation(s)
- S Stelloo
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - E Nevedomskaya
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - Y Kim
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - L Hoekman
- Mass Spectrometry and Proteomics Facility, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - O B Bleijerveld
- Mass Spectrometry and Proteomics Facility, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - T Mirza
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - L F A Wessels
- Division of Molecular Carcinogenesis, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Faculty of EEMCS, Delft University of Technology, Delft, The Netherlands
| | - W M van Weerden
- Department of Urology, Erasmus MC Cancer Institute, Erasmus University Medical Center, Rotterdam, The Netherlands
| | - A F M Altelaar
- Mass Spectrometry and Proteomics Facility, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Biomolecular Mass Spectrometry and Proteomics Group, Bijvoet Center for Biomolecular Research and Utrecht Institute for Pharmaceutical Sciences, The Netherlands Proteomics Centre, Utrecht University, Utrecht, The Netherlands
| | - A M Bergman
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands.,Division of Medical Oncology, The Netherlands Cancer Institute, Amsterdam, The Netherlands
| | - W Zwart
- Division of Oncogenomics, The Netherlands Cancer Institute, Amsterdam, The Netherlands
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Ghosh SK, Patton JR, Spanjaard RA. A small RNA derived from RNA coactivator SRA blocks steroid receptor signaling via inhibition of Pus1p-mediated pseudouridylation of SRA: evidence of a novel RNA binding domain in the N-terminus of steroid receptors. Biochemistry 2012; 51:8163-72. [PMID: 22998747 DOI: 10.1021/bi300602r] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Estrogen receptors (ERs) and androgen receptors (ARs) are important targets for cancer therapy; however, the efficacy of receptor antagonists is limited, and alternative strategies are needed. Steroid receptor RNA Activator (SRA) is a long, noncoding RNA coactivator (although some protein-encoding 5' splice variants have also been reported) that requires pseudouridylation by Pus1p to stimulate steroid receptor signaling. A uridine at position 206 (U206), which is located in small hairpin structure STR5 in the conserved SRA core sequence, is a critical target for pseudouridylation. We assessed if synthetic STR5 could serve as a novel competitive inhibitor of ERα and AR signaling by disrupting the Pus1p-SRA-steroid receptor axis. STR5 specifically inhibited Pus1p-dependent pseudouridylation of SRA with higher efficiency than STR5 mutant U206A. We show that SRA binds to the N-terminal domain (NTD) of ERα and AR with high affinity despite the absence of a recognizable RNA binding motif (RBM). Finally, we show that STR5 specifically inhibits ERα- and AR-dependent transactivation of target genes in steroid-sensitive cancer cells, consistent with disruption of the targeted Pus1p-SRA pathway. Together, our results show that the NTD of ERα and AR contains a novel RBM that directly binds SRA, and that STR5 can serve as a novel class of RNA inhibitor of ERα and AR signaling by interfering with Pus1p-mediated SRA pseudouridylation. Targeting this unexplored receptor signaling pathway may pave the way for the development of new types of cancer therapeutics.
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Affiliation(s)
- Sajal K Ghosh
- Department of Medicine, Cancer Center, Boston University School of Medicine, Boston, MA 02118, USA
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Yu Z, Wang AM, Robins DM, Lieberman AP. Altered RNA splicing contributes to skeletal muscle pathology in Kennedy disease knock-in mice. Dis Model Mech 2009; 2:500-7. [PMID: 19692580 DOI: 10.1242/dmm.003301] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
Here, we used a mouse model of Kennedy disease, a degenerative disorder caused by an expanded CAG repeat in the androgen receptor (AR) gene, to explore pathways leading to cellular dysfunction. We demonstrate that male mice containing a targeted Ar allele with 113 CAG repeats (AR113Q mice) exhibit hormone- and glutamine length-dependent missplicing of Clcn1 RNA in skeletal muscle. Changes in RNA splicing are associated with increased expression of the RNA-binding protein CUGBP1. Furthermore, we show that skeletal muscle denervation in the absence of a repeat expansion leads to increased CUGBP1 expression. However, this induction of CUGBP1 is not sufficient to alter Clcn1 RNA splicing, indicating that changes mediated by both denervation and AR113Q toxicity contribute to altered RNA processing. To test this notion directly, we exogenously expressed the AR in vitro and observed hormone-dependent changes in the splicing of pre-mRNAs from a human cardiac troponin T minigene. These effects were notably similar to changes mediated by RNA with expanded CUG tracts, but not CAG tracts, highlighting unanticipated similarities between CAG and CUG repeat diseases. The expanded glutamine AR also altered hormone-dependent splicing of a calcitonin/calcitonin gene-related peptide minigene, suggesting that toxicity of the mutant protein additionally affects RNA processing pathways that are distinct from those regulated by CUGBP1. Our studies demonstrate the occurrence of hormone-dependent alterations in RNA splicing in Kennedy disease models, and they indicate that these changes are mediated by both the cell-autonomous effects of the expanded glutamine AR protein and by alterations in skeletal muscle that are secondary to denervation.
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Affiliation(s)
- Zhigang Yu
- Department of Pathology, The University of Michigan Medical School, Ann Arbor, MI 48109, USA
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Heemers HV, Tindall DJ. Androgen receptor (AR) coregulators: a diversity of functions converging on and regulating the AR transcriptional complex. Endocr Rev 2007; 28:778-808. [PMID: 17940184 DOI: 10.1210/er.2007-0019] [Citation(s) in RCA: 494] [Impact Index Per Article: 29.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Androgens, acting through the androgen receptor (AR), are responsible for the development of the male phenotype during embryogenesis, the achievement of sexual maturation at puberty, and the maintenance of male reproductive function and behavior in adulthood. In addition, androgens affect a wide variety of nonreproductive tissues. Moreover, aberrant androgen action plays a critical role in multiple pathologies, including prostate cancer and androgen insensitivity syndromes. The formation of a productive AR transcriptional complex requires the functional and structural interaction of the AR with its coregulators. In the last decade, an overwhelming and ever increasing number of proteins have been proposed to possess AR coactivating or corepressing characteristics. Intriguingly, a vast diversity of functions has been ascribed to these proteins, indicating that a multitude of cellular functions and signals converge on the AR to regulate its function. The current review aims to provide an overview of the AR coregulator proteins identified to date and to propose a classification of these AR coregulator proteins according to the function(s) ascribed to them. Taken together, this approach will increase our understanding of the cellular pathways that converge on the AR to ensure an appropriate transcriptional response to androgens.
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Affiliation(s)
- Hannelore V Heemers
- Department of Urology Research, Mayo Clinic, Rochester, Minnesota 55905, USA
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Auboeuf D, Batsché E, Dutertre M, Muchardt C, O'Malley BW. Coregulators: transducing signal from transcription to alternative splicing. Trends Endocrinol Metab 2007; 18:122-9. [PMID: 17320409 DOI: 10.1016/j.tem.2007.02.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/13/2006] [Revised: 01/10/2007] [Accepted: 02/08/2007] [Indexed: 01/07/2023]
Abstract
Cells respond to many external stimuli by modulating gene expression. A key step in this regulation is the control of transcription, which determines the concentrations of pre-mRNA that are produced. A second level of control involves maturation of pre-mRNAs; many are alternatively spliced, which changes the exon content of transcripts and therefore the 'message' of the genes. Recent data indicate that the two control levels are linked. Here, we describe how transcriptional regulators and coregulators influence alternative splicing, with a focus on genes that are controlled by steroid hormones. Recent technical advances that help to elucidate the impact of stimuli on the exon content of regulated gene transcripts are also discussed.
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Affiliation(s)
- Didier Auboeuf
- INSERM, U685/AVENIR, Centre G. Hayem, Hôpital Saint Louis, 1 Avenue Claude Vellefaux, 75010 Paris, France.
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