1
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Borghi F, Azevedo C, Johnson E, Burden JJ, Saiardi A. A mammalian model reveals inorganic polyphosphate channeling into the nucleolus and induction of a hyper-condensate state. CELL REPORTS METHODS 2024; 4:100814. [PMID: 38981472 PMCID: PMC11294840 DOI: 10.1016/j.crmeth.2024.100814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2024] [Revised: 05/23/2024] [Accepted: 06/13/2024] [Indexed: 07/11/2024]
Abstract
Inorganic polyphosphate (polyP) is a ubiquitous polymer that controls fundamental processes. To overcome the absence of a genetically tractable mammalian model, we developed an inducible mammalian cell line expressing Escherichia coli polyphosphate kinase 1 (EcPPK1). Inducing EcPPK1 expression prompted polyP synthesis, enabling validation of polyP analytical methods. Virtually all newly synthesized polyP accumulates within the nucleus, mainly in the nucleolus. The channeled polyP within the nucleolus results in the redistribution of its markers, leading to altered rRNA processing. Ultrastructural analysis reveals electron-dense polyP structures associated with a hyper-condensed nucleolus resulting from an exacerbation of the liquid-liquid phase separation (LLPS) phenomena controlling this membraneless organelle. The selective accumulation of polyP in the nucleoli could be interpreted as an amplification of polyP channeling to where its physiological function takes place. Indeed, quantitative analysis of several mammalian cell lines confirms that endogenous polyP accumulates within the nucleolus.
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Affiliation(s)
- Filipy Borghi
- Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Cristina Azevedo
- Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Errin Johnson
- Sir William Dunn School of Pathology, University of Oxford, Oxford OX1 3RE, UK
| | - Jemima J Burden
- Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK
| | - Adolfo Saiardi
- Laboratory for Molecular Cell Biology, University College London, London WC1E 6BT, UK.
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2
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Statello L, Fernandez-Justel JM, González J, Montes M, Ranieri A, Goñi E, Mas AM, Huarte M. The chromatin-associated lncREST ensures effective replication stress response by promoting the assembly of fork signaling factors. Nat Commun 2024; 15:978. [PMID: 38302450 PMCID: PMC10834948 DOI: 10.1038/s41467-024-45183-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Accepted: 01/17/2024] [Indexed: 02/03/2024] Open
Abstract
Besides the well-characterized protein network involved in the replication stress response, several regulatory RNAs have been shown to play a role in this critical process. However, it has remained elusive whether they act locally at the stressed forks. Here, by investigating the RNAs localizing on chromatin upon replication stress induced by hydroxyurea, we identified a set of lncRNAs upregulated in S-phase and controlled by stress transcription factors. Among them, we demonstrate that the previously uncharacterized lncRNA lncREST (long non-coding RNA REplication STress) is transcriptionally controlled by p53 and localizes at stressed replication forks. LncREST-depleted cells experience sustained replication fork progression and accumulate un-signaled DNA damage. Under replication stress, lncREST interacts with the protein NCL and assists in engaging its interaction with RPA. The loss of lncREST is associated with a reduced NCL-RPA interaction and decreased RPA on chromatin, leading to defective replication stress signaling and accumulation of mitotic defects, resulting in apoptosis and a reduction in tumorigenic potential of cancer cells. These findings uncover the function of a lncRNA in favoring the recruitment of replication proteins to sites of DNA replication.
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Affiliation(s)
- Luisa Statello
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain.
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain.
| | - José Miguel Fernandez-Justel
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Jovanna González
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Marta Montes
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Alessia Ranieri
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Enrique Goñi
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Aina M Mas
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain
| | - Maite Huarte
- Center for Applied Medical Research, University of Navarra, Pio XII 55 Ave, 11 31008, Pamplona, Spain.
- Institute of Health Research of Navarra (IdiSNA), Cancer Center Clínica Universidad de Navarra (CCUN), Pamplona, Spain.
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3
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Xia Y, Cheng X, Nilsson T, Zhang M, Zhao G, Inuzuka T, Teng Y, Li Y, Anderson DE, Holdorf M, Liang TJ. Nucleolin binds to and regulates transcription of hepatitis B virus covalently closed circular DNA minichromosome. Proc Natl Acad Sci U S A 2023; 120:e2306390120. [PMID: 38015841 PMCID: PMC10710063 DOI: 10.1073/pnas.2306390120] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Accepted: 10/03/2023] [Indexed: 11/30/2023] Open
Abstract
Hepatitis B virus (HBV) remains a major public health threat with nearly 300 million people chronically infected worldwide who are at a high risk of developing hepatocellular carcinoma. Current therapies are effective in suppressing HBV replication but rarely lead to cure. Current therapies do not affect the HBV covalently closed circular DNA (cccDNA), which serves as the template for viral transcription and replication and is highly stable in infected cells to ensure viral persistence. In this study, we aim to identify and elucidate the functional role of cccDNA-associated host factors using affinity purification and protein mass spectrometry in HBV-infected cells. Nucleolin was identified as a key cccDNA-binding protein and shown to play an important role in HBV cccDNA transcription, likely via epigenetic regulation. Targeting nucleolin to silence cccDNA transcription in infected hepatocytes may be a promising therapeutic strategy for a functional cure of HBV.
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Affiliation(s)
- Yuchen Xia
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Institute of Medical Virology, TaiKang Center for Life and Medical Sciences, TaiKang Medical School, Wuhan University, Wuhan430071, China
| | - Xiaoming Cheng
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Institute of Medical Virology, TaiKang Center for Life and Medical Sciences, TaiKang Medical School, Wuhan University, Wuhan430071, China
| | - Tobias Nilsson
- Department of Infectious Diseases, Novartis Institutes for Biomedical Research, Emeryville, CA94608
| | - Min Zhang
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
| | - Gaihong Zhao
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Institute of Medical Virology, TaiKang Center for Life and Medical Sciences, TaiKang Medical School, Wuhan University, Wuhan430071, China
| | - Tadashi Inuzuka
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
| | - Yan Teng
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Institute of Medical Virology, TaiKang Center for Life and Medical Sciences, TaiKang Medical School, Wuhan University, Wuhan430071, China
| | - Yao Li
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
| | - D. Eric Anderson
- Advanced Mass Spectrometry Core, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
| | - Meghan Holdorf
- Department of Infectious Diseases, Novartis Institutes for Biomedical Research, Emeryville, CA94608
| | - T. Jake Liang
- Liver Diseases Branch, National Institute of Diabetes and Digestive and Kidney Diseases, NIH, Bethesda, MD20892
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4
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Kumar C, Mylavarapu SVS. Nucleolin is required for multiple centrosome-associated functions in early vertebrate mitosis. Chromosoma 2023; 132:305-315. [PMID: 37615728 DOI: 10.1007/s00412-023-00808-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 06/10/2023] [Accepted: 08/11/2023] [Indexed: 08/25/2023]
Abstract
Nucleolin is a multifunctional RNA-binding protein that resides predominantly not only in the nucleolus, but also in multiple other subcellular pools in the cytoplasm in mammalian cells, and is best known for its roles in ribosome biogenesis, RNA stability, and translation. During early mitosis, nucleolin is required for equatorial mitotic chromosome alignment prior to metaphase. Using high resolution fluorescence imaging, we reveal that nucleolin is required for multiple centrosome-associated functions at the G2-prophase boundary. Nucleolin depletion led to dissociation of the centrosomes from the G2 nuclear envelope, a delay in the onset of nuclear envelope breakdown, reduced inter-centrosome separation, and longer metaphase spindles. Our results reveal novel roles for nucleolin in early mammalian mitosis, establishing multiple important functions for nucleolin during mammalian cell division.
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Affiliation(s)
- Chandan Kumar
- Laboratory of Cellular Dynamics, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad, Haryana, -121001, India
| | - Sivaram V S Mylavarapu
- Laboratory of Cellular Dynamics, Regional Centre for Biotechnology, NCR Biotech Science Cluster, 3rd Milestone, Faridabad-Gurgaon Expressway, Faridabad, Haryana, -121001, India.
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5
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Thongchot S, Aksonnam K, Thuwajit P, Yenchitsomanus PT, Thuwajit C. Nucleolin‑based targeting strategies in cancer treatment: Focus on cancer immunotherapy (Review). Int J Mol Med 2023; 52:81. [PMID: 37477132 PMCID: PMC10555485 DOI: 10.3892/ijmm.2023.5284] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Accepted: 06/15/2023] [Indexed: 07/22/2023] Open
Abstract
The benefits of treating several types of cancers using immunotherapy have recently been established. The overexpression of nucleolin (NCL) in a number of types of cancer provides an attractive antigen target for the development of novel anticancer immunotherapeutic treatments. NCL is a multifunctional protein abundantly distributed in the nucleus, cytoplasm and cell membrane. It influences carcinogenesis, and the proliferation, survival and metastasis of cancer cells, leading to cancer progression. Additionally, the meta‑analysis of total and cytoplasmic NCL overexpression indicates a poor prognosis of patients with breast cancer. The AS1411 aptamers currently appear to have therapeutic action in the phase II clinical trial. The authors' research group has recently explored the anticancer function of NCL through the activation of T cells by dendritic cell‑based immunotherapy. The present review describes and discusses the mechanisms through which the multiple functions of NCL can participate in the progression of cancer. In addition, the studies that define the utility of NCL‑dependent anticancer therapies are summarized, with specific focus being paid to cancer immunotherapeutic approaches.
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Affiliation(s)
- Suyanee Thongchot
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University
- Siriraj Center of Research Excellence for Cancer Immunotherapy (SiCORE-CIT), Research Department, Faculty of Medicine Siriraj Hospital, Mahidol University
| | - Krittaya Aksonnam
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University
| | - Peti Thuwajit
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University
| | - Pa-Thai Yenchitsomanus
- Siriraj Center of Research Excellence for Cancer Immunotherapy (SiCORE-CIT), Research Department, Faculty of Medicine Siriraj Hospital, Mahidol University
- Division of Molecular Medicine, Research Department, Faculty of Medicine Siriraj Hospital, Mahidol University, Bangkok 10700, Thailand
| | - Chanitra Thuwajit
- Department of Immunology, Faculty of Medicine Siriraj Hospital, Mahidol University
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6
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Nishino Y, Homma T, Ihara KI, Fujii J, Tachibana T, Yokoyama C. Generation of Rat Monoclonal Antibody for Human Nucleolin. Monoclon Antib Immunodiagn Immunother 2023; 42:145-149. [PMID: 37589992 DOI: 10.1089/mab.2023.0008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/18/2023] Open
Abstract
Nucleolin (NCL) is a multifunctional phosphoprotein that is mainly localized in the nucleolus, but it is also found in the nucleoplasm, cytoplasm, and cell membrane. The principal functions of NCL involve DNA and RNA metabolism, gene transcription and translation, ribosome biogenesis, and mRNA stability. It was also reported that the localization of human NCL (hNCL) is related to tumor malignancy. Therefore, analyzing the cellular dynamics of NCL could be useful. In this article, we describe rat monoclonal antibody (mAb) 6F9A6 that was generated against a hNCL peptide. This mAb recognizes endogenous human, monkey, dog, and mouse NCL and was shown to be useful in immunofluorescence staining, immunoprecipitation, and immunoblotting experiments in several cancer cell lines. We anticipate that the mAb 6F9A6 will be useful for functional analyses of hNCL in cancer cells.
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Affiliation(s)
- Yuki Nishino
- Department of Chemistry and Bioengineering, Graduate School of Engineering; and Graduate School of Medicine; Osaka Metropolitan University, Osaka, Japan
| | - Takujiro Homma
- Department of Pharmacology, Graduate School of Medicine; Osaka Metropolitan University, Osaka, Japan
| | - Kan-Ichiro Ihara
- Department of Chemistry and Bioengineering, Graduate School of Engineering; and Graduate School of Medicine; Osaka Metropolitan University, Osaka, Japan
| | - Junichi Fujii
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, Japan
| | - Taro Tachibana
- Department of Chemistry and Bioengineering, Graduate School of Engineering; and Graduate School of Medicine; Osaka Metropolitan University, Osaka, Japan
| | - Chikako Yokoyama
- Department of Chemistry and Bioengineering, Graduate School of Engineering; and Graduate School of Medicine; Osaka Metropolitan University, Osaka, Japan
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7
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Yokoyama C, Kobayashi S, Harada Y, Nishino Y, Fujii J, Tachibana T. Generation of Rat Monoclonal Antibody for Mouse Nucleolin by Immunization of Ferroptosis-Induced Hepa 1-6 Cells. Monoclon Antib Immunodiagn Immunother 2022; 41:255-259. [PMID: 36269321 DOI: 10.1089/mab.2022.0005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Nucleolin is a multifunctional phosphoprotein that is ubiquitously distributed in the nucleus, nucleoplasm, cytoplasm, and cell membrane. The principal functions of nucleolin involve DNA and RNA metabolism, gene transcription and translation, ribosome biogenesis, and mRNA stability. Ferroptosis is a type of regulated cell death that is characterized by the iron-dependent accumulation of lipid peroxidation products. In a previous study, we produced monoclonal antibodies (mAbs) against lysates prepared from ferroptosis-induced Hepa 1-6 cells. In this study, we describe one of those rat mAbs, 4B5, which was generated against mouse nucleolin. This mAb was useful in immunofluorescence staining, immunoblotting, and immunoprecipitation experiments, and was confirmed to recognize endogenous nucleolin in mouse cell lines and tissues. We anticipate that mAb 4B5 will be useful for functional analyses of nucleolin.
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Affiliation(s)
- Chikako Yokoyama
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, Osaka, Japan.,Department of Chemistry and Bioengineering, Graduate School of Engineering, Osaka Metropolitan University, Osaka, Japan
| | - Sho Kobayashi
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, Japan
| | - Yumi Harada
- Department of Biochemical Engineering, Graduate School of Science and Engineering, Yamagata University, Yamagata, Japan
| | - Yuki Nishino
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, Osaka, Japan.,Department of Chemistry and Bioengineering, Graduate School of Engineering, Osaka Metropolitan University, Osaka, Japan
| | - Junichi Fujii
- Department of Biochemistry and Molecular Biology, Graduate School of Medical Science, Yamagata University, Yamagata, Japan
| | - Taro Tachibana
- Department of Applied Chemistry and Bioengineering, Graduate School of Engineering, Osaka City University, Osaka, Japan.,Department of Chemistry and Bioengineering, Graduate School of Engineering, Osaka Metropolitan University, Osaka, Japan
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8
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Wang D, Hou L, Zhu N, Yang X, Zhou J, Cui Y, Guo J, Feng X, Liu J. Interaction of Nucleolin with the Fusion Protein of Avian Metapneumovirus Subgroup C Contributes to Viral Replication. Viruses 2022; 14:v14071402. [PMID: 35891383 PMCID: PMC9317408 DOI: 10.3390/v14071402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2022] [Revised: 06/23/2022] [Accepted: 06/24/2022] [Indexed: 12/02/2022] Open
Abstract
Avian metapneumovirus subgroup C (aMPV/C) is highly pathogenic to various avian species with acute respiratory tract clinicopathology and/or drops in egg production. Nucleolin (NCL), an important nucleolar protein, has been shown to regulate multiple viral replication and serve as a functional receptor for viral entry and internalization. Whether NCL is involved in aMPV/C pathogenesis is not known. In this study, we found that aMPV/C infection altered the subcellular localization of NCL in cultured cells. siRNA-targeted NCL resulted in a remarkable decline in aMPV/C replication in Vero cells. DF-1 cells showed a similar response after CRISPR/Cas9-mediated knock out of NCL during aMPV/C infection. Conversely, NCL overexpression significantly increased aMPV/C replication. Pretreatment with AS1411-a aptamer, a guanine (G)-rich oligonucleotide that forms four-stranded structures and competitively binding to NCL, decreased aMPV/C replication and viral titers in cultured cells. Additionally, we found that the aMPV/C fusion (F) protein specifically interacts with NCL through its central domain and that AS1411 disrupts this interaction, thus inhibiting viral replication. Taken together, these results reveal that the aMPV/C F protein interacts with NCL, which is employed by aMPV/C for efficient replication, thereby highlighting the strategic potential for control and therapy of aMPV/C infection.
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Affiliation(s)
- Dedong Wang
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Lei Hou
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Ning Zhu
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Xiaoyu Yang
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jianwei Zhou
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Yongqiu Cui
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jinshuo Guo
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Xufei Feng
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
| | - Jue Liu
- College of Veterimary Medicine, Yangzhou University, Yangzhou 225009, China; (D.W.); (L.H.); (N.Z.); (X.Y.); (J.Z.); (Y.C.); (J.G.); (X.F.)
- Jiangsu Co-Innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou 225009, China
- Correspondence:
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9
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Fabre L, Rousset C, Monier K, Da Cruz-Boisson F, Bouvet P, Charreyre MT, Delair T, Fleury E, Favier A. Fluorescent Polymer-AS1411-Aptamer Probe for dSTORM Super-Resolution Imaging of Endogenous Nucleolin. Biomacromolecules 2022; 23:2302-2314. [PMID: 35549176 DOI: 10.1021/acs.biomac.1c01706] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Nucleolin is a multifunctional protein involved in essential biological processes. To precisely localize it and unravel its different roles in cells, fluorescence imaging is a powerful tool, especially super-resolution techniques. Here, we developed polymer-aptamer probes, both small and bright, adapted to direct stochastic optical reconstruction microscopy (dSTORM). Well-defined fluorescent polymer chains bearing fluorophores (AlexaFluor647) and a reactive end group were prepared via RAFT polymerization. The reactive end-group was then used for the oriented conjugation with AS1411, a DNA aptamer that recognizes nucleolin with high affinity. Conjugation via strain-promoted alkyne/azide click chemistry (SPAAC) between dibenzylcyclooctyne-ended fluorescent polymer chains and 3'-azido-functionalized nucleic acids proved to be the most efficient approach. In vitro and in cellulo evaluations demonstrated that selective recognition for nucleolin was retained. Their brightness and small size make these polymer-aptamer probes an appealing alternative to immunofluorescence, especially for super-resolution (10-20 nm) nanoscopy. dSTORM imaging demonstrated the ability of our fluorescent polymer-aptamer probe to provide selective and super-resolved detection of cell surface nucleolin.
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Affiliation(s)
- Laura Fabre
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Corentin Rousset
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Karine Monier
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Fernande Da Cruz-Boisson
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Philippe Bouvet
- Univ Lyon, Centre Léon Bérard, UMR INSERM 1052 CNRS 5286, Centre de recherche en cancérologie de Lyon, Lyon F-69008, France
| | - Marie-Thérèse Charreyre
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Thierry Delair
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Etienne Fleury
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
| | - Arnaud Favier
- Univ Lyon, CNRS, UMR 5223, Ingénierie des Matériaux Polymères, Université Claude Bernard Lyon 1, INSA Lyon, F-69622 Villeurbanne Cédex, France
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10
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Zhu J, Miao Q, Guo H, Tang A, Dong D, Tang J, Wang F, Tong G, Liu G. Nucleolin interacts with the rabbit hemorrhagic disease virus replicase RdRp, nonstructural proteins p16 and p23, playing a role in virus replication. Virol Sin 2022; 37:48-59. [PMID: 35234629 PMCID: PMC8922422 DOI: 10.1016/j.virs.2022.01.004] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Accepted: 09/15/2021] [Indexed: 11/24/2022] Open
Abstract
Rabbit hemorrhagic disease virus (RHDV) is a member of the Caliciviridae family and cannot be propagated in vitro, which has impeded the progress of investigating its replication mechanism. Construction of an RHDV replicon system has recently provided a platform for exploring RHDV replication in host cells. Here, aided by this replicon system and using two-step affinity purification, we purified the RHDV replicase and identified its associated host factors. We identified rabbit nucleolin (NCL) as a physical link, which mediating the interaction between other RNA-dependent RNA polymerase (RdRp)-related host proteins and the viral replicase RdRp. We found that the overexpression or knockdown of NCL significantly increased or severely impaired RHDV replication in RK-13 cells, respectively. NCL was identified to directly interact with RHDV RdRp, p16, and p23. Furthermore, NCL knockdown severely impaired the binding of RdRp to RdRp-related host factors. Collectively, these results indicate that the host protein NCL is essential for RHDV replication and acts as a physical link between viral replicase and host proteins.
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Affiliation(s)
- Jie Zhu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China
| | - Qiuhong Miao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China; Laboratory of Virology, Wageningen University and Research, Wageningen, 6708 PB, the Netherlands
| | - Hongyuan Guo
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China
| | - Aoxing Tang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China
| | - Dandan Dong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China
| | - Jingyu Tang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China
| | - Fang Wang
- Institute of Veterinary Medicine, Jiangsu Academy of Agricultural Sciences, Nanjing, 210014, China
| | - Guangzhi Tong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China.
| | - Guangqing Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, China.
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11
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Sheikh TI, Harripaul R, Vasli N, Ghadami M, Santangelo SL, Ayub M, Sasanfar R, Vincent JB. Heterozygous De Novo Truncating Mutation of Nucleolin in an ASD Individual Disrupts Its Nucleolar Localization. Genes (Basel) 2021; 13:51. [PMID: 35052391 PMCID: PMC8774667 DOI: 10.3390/genes13010051] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Revised: 12/10/2021] [Accepted: 12/14/2021] [Indexed: 11/16/2022] Open
Abstract
Nucleolin (NCL/C23; OMIM: 164035) is a major nucleolar protein that plays a critical role in multiple processes, including ribosome assembly and maturation, chromatin decondensation, and pre-rRNA transcription. Due to its diverse functions, nucleolin has frequently been implicated in pathological processes, including cancer and viral infection. We recently identified a de novo frameshifting indel mutation of NCL, p.Gly664Glufs*70, through whole-exome sequencing of autism spectrum disorder trios. Through the transfection of constructs encoding either a wild-type human nucleolin or a mutant nucleolin with the same C-terminal sequence predicted for the autism proband, and by using co-localization with the nucleophosmin (NPM; B23) protein, we have shown that the nucleolin mutation leads to mislocalization of the NCL protein from the nucleolus to the nucleoplasm. Moreover, a construct with a nonsense mutation at the same residue, p.Gly664*, shows a very similar effect on the location of the NCL protein, thus confirming the presence of a predicted nucleolar location signal in this region of the NCL protein. Real-time fluorescence recovery experiments show significant changes in the kinetics and mobility of mutant NCL protein in the nucleoplasm of HEK293Tcells. Several other studies also report de novoNCL mutations in ASD or neurodevelopmental disorders. The altered mislocalization and dynamics of mutant NCL (p.G664Glufs*70/p.G664*) may have relevance to the etiopathlogy of NCL-related ASD and other neurodevelopmental phenotypes.
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Affiliation(s)
- Taimoor I. Sheikh
- Molecular Neuropsychiatry & Development (MiND) Lab, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON M5T 1R8, Canada; (T.I.S.); (R.H.)
| | - Ricardo Harripaul
- Molecular Neuropsychiatry & Development (MiND) Lab, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON M5T 1R8, Canada; (T.I.S.); (R.H.)
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
| | - Nasim Vasli
- Department of Pediatric Laboratory Medicine, Hospital for Sick Children, Toronto, ON M5G 1X8, Canada;
| | - Majid Ghadami
- Department of Educational Sciences, Farhangian University, Tehran 19989-63341, Iran;
| | - Susan L. Santangelo
- Center for Psychiatric Research, Maine Medical Center Research Institute, Portland, ME 04101, USA;
- Department of Psychiatry, Tufts University School of Medicine, Boston, MA 02110, USA
- Department of Psychiatry, Maine Medical Center, Portland, ME 04102, USA
| | - Muhammad Ayub
- Department of Psychiatry, Queen’s University, Kingston, ON K7L 7X3, Canada;
- Department of Academic Psychiatry, University College London, London WC1E 6BT, UK
| | - Roksana Sasanfar
- Department of Psychiatry, Harvard Medical School, Boston, MA 02215, USA;
- Psychiatric and Neurodevelopmental Genetics Unit, Center for Human Genetic Research, Massachusetts General Hospital, Boston, MA 02114, USA
| | - John B. Vincent
- Molecular Neuropsychiatry & Development (MiND) Lab, Campbell Family Mental Health Research Institute, Centre for Addiction and Mental Health, Toronto, ON M5T 1R8, Canada; (T.I.S.); (R.H.)
- Institute of Medical Science, University of Toronto, Toronto, ON M5S 1A8, Canada
- Department of Psychiatry, University of Toronto, Toronto, ON M5T 1R8, Canada
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12
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González‐Arzola K, Guerra‐Castellano A, Rivero‐Rodríguez F, Casado‐Combreras MÁ, Pérez‐Mejías G, Díaz‐Quintana A, Díaz‐Moreno I, De la Rosa MA. Mitochondrial cytochrome c shot towards histone chaperone condensates in the nucleus. FEBS Open Bio 2021; 11:2418-2440. [PMID: 33938164 PMCID: PMC8409293 DOI: 10.1002/2211-5463.13176] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 04/26/2021] [Indexed: 12/15/2022] Open
Abstract
Despite mitochondria being key for the control of cell homeostasis and fate, their role in DNA damage response is usually just regarded as an apoptotic trigger. However, growing evidence points to mitochondrial factors modulating nuclear functions. Remarkably, after DNA damage, cytochrome c (Cc) interacts in the cell nucleus with a variety of well-known histone chaperones, whose activity is competitively inhibited by the haem protein. As nuclear Cc inhibits the nucleosome assembly/disassembly activity of histone chaperones, it might indeed affect chromatin dynamics and histone deposition on DNA. Several histone chaperones actually interact with Cc Lys residues through their acidic regions, which are also involved in heterotypic interactions leading to liquid-liquid phase transitions responsible for the assembly of nuclear condensates, including heterochromatin. This relies on dynamic histone-DNA interactions that can be modulated by acetylation of specific histone Lys residues. Thus, Cc may have a major regulatory role in DNA repair by fine-tuning nucleosome assembly activity and likely nuclear condensate formation.
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Affiliation(s)
- Katiuska González‐Arzola
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Alejandra Guerra‐Castellano
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Francisco Rivero‐Rodríguez
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Miguel Á. Casado‐Combreras
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Gonzalo Pérez‐Mejías
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Antonio Díaz‐Quintana
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Irene Díaz‐Moreno
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
| | - Miguel A. De la Rosa
- Institute for Chemical Research (IIQ)Scientific Research Centre Isla de la Cartuja (cicCartuja)University of Seville – CSICSpain
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13
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Abstract
In over two decades since the discovery of phosphatase and tensin homologue deleted on chromosome 10 (PTEN), nearly 18,000 publications have attempted to elucidate its functions and roles in normal physiology and disease. The frequent disruption of PTEN in cancer cells was a strong indication that it had critical roles in tumour suppression. Germline PTEN mutations have been identified in patients with heterogeneous tumour syndromic diseases, known as PTEN hamartoma tumour syndrome (PHTS), and in some individuals with autism spectrum disorders (ASD). Today we know that by limiting oncogenic signalling through the phosphoinositide 3-kinase (PI3K) pathway, PTEN governs a number of processes including survival, proliferation, energy metabolism, and cellular architecture. Some of the most exciting recent advances in the understanding of PTEN biology and signalling have revisited its unappreciated roles as a protein phosphatase, identified non-enzymatic scaffold functions, and unravelled its nuclear function. These discoveries are certain to provide a new perspective on its full tumour suppressor potential, and knowledge from this work will lead to new anti-cancer strategies that exploit PTEN biology. In this review, we will highlight some outstanding questions and some of the very latest advances in the understanding of the tumour suppressor PTEN.
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Affiliation(s)
- Jonathan Tak-Sum Chow
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
| | - Leonardo Salmena
- Department of Pharmacology and Toxicology, University of Toronto, Toronto, Ontario, Canada
- Princess Margaret Cancer Centre, University Health Network, Toronto, Ontario, Canada
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14
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Dong D, Zhu S, Miao Q, Zhu J, Tang A, Qi R, Liu T, Yin D, Liu G. Nucleolin (NCL) inhibits the growth of peste des petits ruminants virus. J Gen Virol 2020; 101:33-43. [PMID: 31794379 PMCID: PMC7414435 DOI: 10.1099/jgv.0.001358] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2019] [Accepted: 11/06/2019] [Indexed: 01/05/2023] Open
Abstract
Peste des petits ruminants (PPR) is a highly contagious disease of small ruminants that is caused by peste des petits ruminants virus (PPRV). To date, the molecular mechanism of PPRV infection is still unclear. It is well known that host proteins might be involved in the pathogenesis process for many viruses. In this study, we first proved that nucleolin (NCL), a highly conserved host factor, interacts with the core domain of PPRV N protein through its C terminus and co-locates with the N protein in the nucleus of cells. To investigate the role of NCL in PPRV infection, the expression level of NCL was inhibited with small interfering RNAs of NCL, and the results showed that PPRV growth was improved. However, the proliferation of PPRV was inhibited when the expression level of NCL was improved. Further analysis indicated that the inhibitory effect of NCL on the PPRV was caused by stimulating the interferon (IFN) pathways in host cells. In summary, our results will help us to understand the mechanism of PPRV infection.
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Affiliation(s)
- Dandan Dong
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Shiqiang Zhu
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Qiuhong Miao
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Jie Zhu
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Aoxing Tang
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Ruibin Qi
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Teng Liu
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Dongdong Yin
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
| | - Guangqing Liu
- Innovation Team of Small Animal Infectious Disease, Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, 200241, PR China
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15
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Abstract
Nucleolin is an RNA binding protein that is involved in many post-transcriptional regulation steps of messenger RNAs in addition to its nucleolar role in ribosomal RNA transcription and assembly in pre-ribosomes. Acetylated nucleolin was found to be associated with nuclear speckles and to co-localize with the splicing factor SC35. Previous nuclear pull down of nucleolin identified several splicing components and factors involved in RNA polymerase II transcription associated with nucleolin. In this report, we show that these splicing components are specifics of the pre-catalytic A and B spliceosomes, while proteins recruited in the Bact, C and P complexes are absent from the nucleolin interacting proteins. Furthermore, we show that acetylated nucleolin co-localized with P-SF3B1, a marker of co-transcriptional active spliceosomes. P-SF3B1 complexes can be pulled down with nucleolin specific antibodies. Interestingly, the alternative splicing of Fibronectin at the IIICS and EDB sites was affected by nucleolin depletion. These data are consistent with a model where nucleolin could be a factor bridging RNA polymerase II transcription and assembly of pre-catalytic spliceosome similarly to its function in the co-transcriptional maturation of pre-rRNA.
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16
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Kamitani M, Kashima M, Tezuka A, Nagano AJ. Lasy-Seq: a high-throughput library preparation method for RNA-Seq and its application in the analysis of plant responses to fluctuating temperatures. Sci Rep 2019; 9:7091. [PMID: 31068632 PMCID: PMC6506593 DOI: 10.1038/s41598-019-43600-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Accepted: 04/26/2019] [Indexed: 02/07/2023] Open
Abstract
RNA-Seq is a whole-transcriptome analysis method used to research biological mechanisms and functions but its use in large-scale experiments is limited by its high cost and labour requirements. In this study, we have established a high-throughput and cost-effective RNA-Seq library preparation method that does not require mRNA enrichment. The method adds unique index sequences to samples during reverse transcription (RT) that is conducted at a higher temperature (≥62 °C) to suppress RT of A-rich sequences in rRNA, and then pools all samples into a single tube. Both single-read and paired-end sequencing of libraries is enabled. We found that the pooled RT products contained large amounts of RNA, mainly rRNA, causing over-estimations of the quantity of DNA and unstable tagmentation results. Degradation of RNA before tagmentation was found to be necessary for the stable preparation of libraries. We named this protocol low-cost and easy RNA-Seq (Lasy-Seq) and used it to investigate temperature responses in Arabidopsis thaliana. We analysed how sub-ambient temperatures (10-30 °C) affected the plant transcriptomes using time-courses of RNA-Seq from plants grown in randomly fluctuating temperature conditions. Our results suggest that there are diverse mechanisms behind plant temperature responses at different time scales.
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Affiliation(s)
- Mari Kamitani
- Research Institute for Food and Agriculture, Ryukoku University, Yokotani, Seta Oe-cho, Otsu, Shiga, Japan
- Center for Ecological Research, Kyoto University, Hirano, Otsu, Shiga, Japan
| | - Makoto Kashima
- Research Institute for Food and Agriculture, Ryukoku University, Yokotani, Seta Oe-cho, Otsu, Shiga, Japan
| | - Ayumi Tezuka
- Research Institute for Food and Agriculture, Ryukoku University, Yokotani, Seta Oe-cho, Otsu, Shiga, Japan
| | - Atsushi J Nagano
- Faculty of Agriculture, Ryukoku University, Yokotani, Seta Oe-cho, Otsu, Shiga, Japan.
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17
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Wang F, Zhou S, Qi D, Xiang SH, Wong ET, Wang X, Fonkem E, Hsieh TC, Yang J, Kirmani B, Shabb JB, Wu JM, Wu M, Huang JH, Yu WH, Wu E. Nucleolin Is a Functional Binding Protein for Salinomycin in Neuroblastoma Stem Cells. J Am Chem Soc 2019; 141:3613-3622. [PMID: 30689374 DOI: 10.1021/jacs.8b12872] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The aim of this study is to illuminate a novel therapeutic approach by identifying a functional binding target of salinomycin, an emerging anticancer stem cell (CSC) agent, and to help dissect the underlying action mechanisms. By utilizing integrated strategies, we identify that nucleolin (NCL) is likely a salinomycin-binding target and a critical regulator involved in human neuroblastoma (NB) CSC activity. Salinomycin markedly suppresses NB CD34 expression and reduces CD34+ cell population in an NCL-dependent manner via disruption of the interaction of NCL with CD34 promoter. The elevated levels of NCL expression in NB tumors are associated with poor patient survival. Altogether, these results indicate that NCL is likely a novel functional salinomycin-binding target that exhibits the potential to be a prognostic marker for NB therapy.
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Affiliation(s)
- Fengfei Wang
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
- Department of Neurology , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Department of Surgery , Texas A & M University College of Medicine , Temple , Texas 76504 , United States
| | - Shuang Zhou
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
- Cancer Research Institute, Department of Medicine, Beth Israel Deaconess Medical Center , Harvard Medical School , Boston , Massachusetts 02215 , United States
| | - Dan Qi
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
| | - Shi-Hua Xiang
- Nebraska Center for Virology, School of Veterinary Medicine and Biomedical Sciences , University of Nebraska-Lincoln , Lincoln , Nebraska 68583 , United States
| | - Eric T Wong
- Cancer Research Institute, Department of Medicine, Beth Israel Deaconess Medical Center , Harvard Medical School , Boston , Massachusetts 02215 , United States
| | - Xuejing Wang
- Department of Neurology , The First Affiliated Hospital of Zhengzhou University , Zhengzhou , Henan 450052 , China
| | - Ekokobe Fonkem
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
- Department of Neurology , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Department of Surgery , Texas A & M University College of Medicine , Temple , Texas 76504 , United States
- LIVESTRONG Cancer Institutes, Dell Medical School , The University of Texas at Austin , Austin , Texas 78712 , United States
| | - Tze-Chen Hsieh
- Department of Biochemistry and Molecular Biology , New York Medical College , Valhalla , New York 10595 , United States
| | - Jianhua Yang
- Texas Children's Cancer Center, Department of Pediatrics, Dan L. Duncan Cancer Center , Baylor College of Medicine , Houston , Texas 77030 , United States
| | - Batool Kirmani
- Department of Neurology , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Department of Surgery , Texas A & M University College of Medicine , Temple , Texas 76504 , United States
| | - John B Shabb
- Department of Biomedical Sciences, School of Medicine and Health Sciences , University of North Dakota , Grand Forks , North Dakota 58202 , United States
| | - Joseph M Wu
- Department of Biochemistry and Molecular Biology , New York Medical College , Valhalla , New York 10595 , United States
| | - Min Wu
- Department of Biomedical Sciences, School of Medicine and Health Sciences , University of North Dakota , Grand Forks , North Dakota 58202 , United States
| | - Jason H Huang
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
- Department of Surgery , Texas A & M University College of Medicine , Temple , Texas 76504 , United States
| | - Wei-Hsuan Yu
- Institute of Biochemistry and Molecular Biology, College of Medicine , National Taiwan University , Taipei 10051 , Taiwan
| | - Erxi Wu
- Department of Neurosurgery , Baylor Scott & White Health , Temple , Texas 78508 , United States
- Neuroscience Institute , Baylor Scott & White Health , Temple , Texas 76502 , United States
- Department of Surgery , Texas A & M University College of Medicine , Temple , Texas 76504 , United States
- LIVESTRONG Cancer Institutes, Dell Medical School , The University of Texas at Austin , Austin , Texas 78712 , United States
- Department of Pharmaceutical Sciences , Texas A & M University College of Pharmacy , College Station , Texas 77843 , United States
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18
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Bian WX, Xie Y, Wang XN, Xu GH, Fu BS, Li S, Long G, Zhou X, Zhang XL. Binding of cellular nucleolin with the viral core RNA G-quadruplex structure suppresses HCV replication. Nucleic Acids Res 2019; 47:56-68. [PMID: 30462330 PMCID: PMC6326805 DOI: 10.1093/nar/gky1177] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2018] [Revised: 10/22/2018] [Accepted: 11/16/2018] [Indexed: 12/12/2022] Open
Abstract
Hepatitis C virus (HCV) infection is a major cause of human chronic liver disease and hepatocellular carcinoma. G-quadruplex (G4) is an important four-stranded secondary structure of nucleic acids. Recently, we discovered that the core gene of HCV contains a G4 RNA structure; however, the interaction between the HCV core RNA G4 and host cellular proteins, and the roles of the HCV core RNA G4 in HCV infection and pathogenesis remain elusive. Here, we identified a cellular protein, nucleolin (NCL), which bound and stabilized the HCV core RNA G4 structure. We demonstrated the direct interaction and colocalization between NCL and wild-type core RNA G4 at both in vitro and in cell physiological conditions of the alive virus; however no significant interaction was found between NCL and G4-modified core RNA. NCL is also associated with HCV particles. HCV infection induced NCL mRNA and protein expression, while NCL suppressed wild-type viral replication and expression, but not G4-modified virus. Silencing of NCL greatly enhanced viral RNA replication. Our findings provide new insights that NCL may act as a host factor for anti-viral innate immunity, and binding of cellular NCL with the viral core RNA G4 structure is involved in suppressing HCV replication.
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Affiliation(s)
- Wen-Xiu Bian
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Medical Research Institute and Department of Immunology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, PR China
| | - Yan Xie
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Medical Research Institute and Department of Immunology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, PR China
| | - Xiao-Ning Wang
- Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Guo-Hua Xu
- Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, Hubei, China
| | - Bo-Shi Fu
- College of Chemistry and Molecular Sciences, Wuhan University, Hubei Province, Wuhan 430072, China
| | - Shu Li
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Medical Research Institute and Department of Immunology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, PR China
| | - Gang Long
- Key Laboratory of Molecular Virology and Immunology, Institute Pasteur of Shanghai, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, China
| | - Xiang Zhou
- College of Chemistry and Molecular Sciences, Wuhan University, Hubei Province, Wuhan 430072, China
| | - Xiao-Lian Zhang
- State Key Laboratory of Virology and Hubei Province Key Laboratory of Allergy and Immunology, Medical Research Institute and Department of Immunology, Wuhan University School of Basic Medical Sciences, Wuhan 430071, PR China
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19
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Zhao H, Tian Y, Li Q, Xu Y. Identification and characterization of lamprey nucleolin-like gene. Acta Biochim Biophys Sin (Shanghai) 2019; 51:112-115. [PMID: 30566574 DOI: 10.1093/abbs/gmy150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2018] [Indexed: 11/14/2022] Open
Affiliation(s)
- Huan Zhao
- Department of Biotechnology, College of Life Science, Liaoning Normal University, Dalian, China
- Lamprey Research Center, Liaoning Normal University, Dalian, China
| | - Yang Tian
- Department of Biotechnology, College of Life Science, Liaoning Normal University, Dalian, China
- Lamprey Research Center, Liaoning Normal University, Dalian, China
| | - Qingwei Li
- Department of Biotechnology, College of Life Science, Liaoning Normal University, Dalian, China
- Lamprey Research Center, Liaoning Normal University, Dalian, China
| | - Yang Xu
- Department of Biotechnology, College of Life Science, Liaoning Normal University, Dalian, China
- Lamprey Research Center, Liaoning Normal University, Dalian, China
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20
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Role of Spata34 in cell proliferation and its expression pattern in postnatal development of rat testis. Mol Biol Rep 2018; 45:2697-2705. [PMID: 30341690 DOI: 10.1007/s11033-018-4439-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Accepted: 10/11/2018] [Indexed: 10/28/2022]
Abstract
Spata34 is a testis-specific-expressed gene which exerts diverse functions in testis development. This study intends to examine the expression profiles of Spata34 in postnatal rat testis, and explore its potential roles in cell proliferation in vitro. We found that the mRNA and protein expression levels of Spata34 were developmentally upregulated in rat testes during the early 1-7 postnatal weeks using real-time polymerase chain reaction and western blotting. Immunohistochemical results indicated that Spata34 protein was mainly detected in the nuclear and cytoplasm of spermatocytes and round spermatids. The possible function of Spata34 in cellular proliferation was analyzed using cell counting kit, colony formation and flow cytometry assays. Our results showed that overexpression of Spata34 in multipotent adult germline stem cell lines (maGSC129SV) cells markedly facilitated cell proliferation with a large increase in cell numbers in S phase of cell cycle. While knockdown of Spata34 expression by specific siRNA suppressed the growth of maGSC129SV cells and triggered cell-cycle arrest at G1/S phase transition, which was related to the elevation of p21 and p27 and decrease of Cyclin D1 and Cyclin D-dependent kinase 4. Altogether, our results indicated that the Spata34 gene evokes unique expression patterns during postnatal development of the rat testis, and for the first time, unravels the function of Spata34 on regulating cell-cycle progress through p21 and p27 pathway.
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21
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Zhu J, Miao Q, Tang J, Wang X, Dong D, Liu T, Qi R, Yang Z, Liu G. Nucleolin mediates the internalization of rabbit hemorrhagic disease virus through clathrin-dependent endocytosis. PLoS Pathog 2018; 14:e1007383. [PMID: 30339712 PMCID: PMC6209375 DOI: 10.1371/journal.ppat.1007383] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Revised: 10/31/2018] [Accepted: 10/04/2018] [Indexed: 01/16/2023] Open
Abstract
Rabbit hemorrhagic disease virus (RHDV) is an important member of the Caliciviridae family and a highly lethal pathogen in rabbits. Although the cell receptor of RHDV has been identified, the mechanism underlying RHDV internalization remains unknown. In this study, the entry and post-internalization of RHDV into host cells were investigated using several biochemical inhibitors and RNA interference. Our data demonstrate that rabbit nucleolin (NCL) plays a key role in RHDV internalization. Further study revealed that NCL specifically interacts with the RHDV capsid protein (VP60) through its N-terminal residues (aa 285-318), and the exact position of the VP60 protein for the interaction with NCL is located in a highly conserved region (472Asp-Val-Asn474; DVN motif). Following competitive blocking of the interaction between NCL and VP60 with an artificial DVN peptide (RRTGDVNAAAGSTNGTQ), the internalization efficiency of the virus was markedly reduced. Moreover, NCL also interacts with the C-terminal residues of clathrin light chain A, which is an important component in clathrin-dependent endocytosis. In addition, the results of animal experiments also demonstrated that artificial DVN peptides protected most rabbits from RHDV infection. These findings demonstrate that NCL is involved in RHDV internalization through clathrin-dependent endocytosis.
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Affiliation(s)
- Jie Zhu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Qiuhong Miao
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
- Laboratory of Virology, Wageningen University and Research, Wageningen, The Netherlands
| | - Jingyu Tang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Xiaoxue Wang
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Dandan Dong
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Teng Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Ruibin Qi
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
| | - Zhibiao Yang
- Shanghai Key Laboratory of Veterinary Biotechnology, Shanghai Jiao Tong University, Shanghai, P. R. China
| | - Guangqing Liu
- Shanghai Veterinary Research Institute, Chinese Academy of Agricultural Sciences, Shanghai, P. R. China
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22
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Gao Z, Hu J, Wang X, Yang Q, Liang Y, Ma C, Liu D, Liu K, Hao X, Gu M, Liu X, Jiao XA, Liu X. The PA-interacting host protein nucleolin acts as an antiviral factor during highly pathogenic H5N1 avian influenza virus infection. Arch Virol 2018; 163:2775-2786. [PMID: 29974255 DOI: 10.1007/s00705-018-3926-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Accepted: 06/19/2018] [Indexed: 01/08/2023]
Abstract
Polymerase acidic (PA) protein is a multifunctional regulator of influenza A virus (IAV) replication and pathogenesis. In a previous study, we reported that nucleolin (NCL) is a novel PA-interacting host protein. In this study, we further explored the role of NCL during highly pathogenic H5N1 avian influenza virus infection. We found that depletion of endogenous NCL in mammalian cells by siRNA targeting during H5N1 infection resulted in significantly increased viral polymerase activity, elevated viral mRNA, cRNA and vRNA synthesis, accelerated viral replication, and enhanced apoptosis and necrosis. Moreover, siRNA silencing of NCL significantly exacerbated the inflammatory response, resulting in increased secretion of IL-6, TNF-α, TNF-β, CCL-4, CCL-8, IFN-α, IFN-β and IFN-γ. Conversely, overexpression of NCL significantly decreased IAV replication. Collectively, these data show that NCL acts as a novel potential antiviral factor during H5N1 infection. Further studies exploring the antiviral mechanisms of NCL may accelerate the development of new anti-influenza drugs.
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Affiliation(s)
- Zhao Gao
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Jiao Hu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Xiaoquan Wang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Qian Yang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Yanyan Liang
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Chunxi Ma
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Dong Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Kaituo Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Xiaoli Hao
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Min Gu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Xiaowen Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Xin-An Jiao
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China
- Jiangsu Key Laboratory of Zoonosis, Yangzhou University, Yangzhou, China
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China
| | - Xiufan Liu
- Animal Infectious Disease Laboratory, School of Veterinary Medicine, College of Veterinary Medicine, Yangzhou University, 48 East Wenhui Road, Yangzhou, 225009, Jiangsu, China.
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonosis, Yangzhou University, Yangzhou, Jiangsu, China.
- Key Laboratory of Prevention and Control of Biological Hazard Factors (Animal Origin) for Agri-food Safety and Quality, Ministry of Agriculture of China (26116120), Yangzhou University, Yangzhou, China.
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23
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Pérez-Sánchez G, Jiménez A, Quezada-Ramírez MA, Estudillo E, Ayala-Sarmiento AE, Mendoza-Hernández G, Hernández-Soto J, Hernández-Hernández FC, Cázares-Raga FE, Segovia J. Annexin A1, Annexin A2, and Dyrk 1B are upregulated during GAS1-induced cell cycle arrest. J Cell Physiol 2018; 233:4166-4182. [PMID: 29030970 DOI: 10.1002/jcp.26226] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Accepted: 10/03/2017] [Indexed: 12/18/2022]
Abstract
GAS1 is a pleiotropic protein that has been investigated because of its ability to induce cell proliferation, cell arrest, and apoptosis, depending on the cellular or the physiological context in which it is expressed. At this point, we have information about the molecular mechanisms by which GAS1 induces proliferation and apoptosis; but very few studies have been focused on elucidating the mechanisms by which GAS1 induces cell arrest. With the aim of expanding our knowledge on this subject, we first focused our research on finding proteins that were preferentially expressed in cells arrested by serum deprivation. By using a proteomics approach and mass spectrometry analysis, we identified 17 proteins in the 2-DE protein profile of serum deprived NIH3T3 cells. Among them, Annexin A1 (Anxa1), Annexin A2 (Anxa2), dual specificity tyrosine-phosphorylation-regulated kinase 1B (Dyrk1B), and Eukaryotic translation initiation factor 3, F (eIf3f) were upregulated at transcriptional the level in proliferative NIH3T3 cells. Moreover, we demonstrated that Anxa1, Anxa2, and Dyrk1b are upregulated at both the transcriptional and translational levels by the overexpression of GAS1. Thus, our results suggest that the upregulation of Anxa1, Anxa2, and Dyrk1b could be related to the ability of GAS1 to induce cell arrest and maintain cell viability. Finally, we provided further evidence showing that GAS1 through Dyrk 1B leads not only to the arrest of NIH3T3 cells but also maintains cell viability.
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Affiliation(s)
- Gilberto Pérez-Sánchez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Adriana Jiménez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Marco A Quezada-Ramírez
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Enrique Estudillo
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Alberto E Ayala-Sarmiento
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | | | - Justino Hernández-Soto
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Fidel C Hernández-Hernández
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Febe E Cázares-Raga
- Departamento de Infectómica y Patogénesis Molecular, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
| | - Jose Segovia
- Departamento de Fisiología, Biofísica y Neurociencias, Centro de Investigación y de Estudios Avanzados del IPN, Ciudad de México, México
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24
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Jia W, Yao Z, Zhao J, Guan Q, Gao L. New perspectives of physiological and pathological functions of nucleolin (NCL). Life Sci 2017; 186:1-10. [PMID: 28751161 DOI: 10.1016/j.lfs.2017.07.025] [Citation(s) in RCA: 145] [Impact Index Per Article: 20.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2017] [Revised: 07/21/2017] [Accepted: 07/23/2017] [Indexed: 12/13/2022]
Abstract
Nucleolin (NCL) is a multifunctional protein that mainly localized in the nucleolus, it is also found in the nucleoplasm, cytoplasm and cell membrane. The three main structural domains allow the interaction of NCL with different proteins and RNA sequences. Moreover, specific post-translational modifications and its shuttling property also contribute to its multifunctionality. NCL has been demonstrated to be involved in a variety of aspects such as ribosome biogenesis, chromatin organization and stability, DNA and RNA metabolism, cytokinesis, cell proliferation, angiogenesis, apoptosis regulation, stress response and microRNA processing. NCL has been increasingly implicated in several pathological processes, especially in tumorigenesis and viral infection, which makes NCL a potential target for the development of anti-tumor and anti-viral strategies. In this review, we present an overview on the structure, localizations and various functions of NCL, and further describe how the multiple functions of NCL are correlated to its multiple cellular distributions.
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Affiliation(s)
- Wenyu Jia
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong Province, PR China; Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Jinan, Shandong Province, PR China; Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, Shandong Province, PR China
| | - Zhenyu Yao
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong Province, PR China; Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Jinan, Shandong Province, PR China; Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, Shandong Province, PR China
| | - Jiajun Zhao
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong Province, PR China; Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Jinan, Shandong Province, PR China; Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, Shandong Province, PR China
| | - Qingbo Guan
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong Province, PR China; Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Jinan, Shandong Province, PR China; Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, Shandong Province, PR China
| | - Ling Gao
- Department of Endocrinology, Shandong Provincial Hospital affiliated to Shandong University, Jinan, Shandong Province, PR China; Shandong Provincial Key Laboratory of Endocrinology and Lipid Metabolism, Jinan, Shandong Province, PR China; Institute of Endocrinology and Metabolism, Shandong Academy of Clinical Medicine, Jinan, Shandong Province, PR China.
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25
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Fan X, Sun L, Li K, Yang X, Cai B, Zhang Y, Zhu Y, Ma Y, Guan Z, Wu Y, Zhang L, Yang Z. The Bioactivity of D-/L-Isonucleoside- and 2'-Deoxyinosine-Incorporated Aptamer AS1411s Including DNA Replication/MicroRNA Expression. MOLECULAR THERAPY. NUCLEIC ACIDS 2017; 9:218-229. [PMID: 29246300 PMCID: PMC5651494 DOI: 10.1016/j.omtn.2017.09.010] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/20/2017] [Revised: 09/28/2017] [Accepted: 09/28/2017] [Indexed: 12/20/2022]
Abstract
In this study, chemical modification of 2'-deoxyinosine (2'-dI) and D-/L-isothymidine (D-/L-isoT) was performed on AS1411. They could promote the nucleotide-protein interaction by changing the local conformation. Twenty modified sequences were obtained, FCL-I and FCL-II showed the most noticeable activity improvement. They stabilized the G-quadruplex, remained highly resistant to serum degradation and specificity for nucleolin, further inhibited tumor cell growth, exhibited a stronger ability to influence the different phases of the tumor cell cycle, induced S-phase arrest, promoted the inhibition of DNA replication, and suppressed the unwound function of a large T antigen as powerful as AS1411. The microarray analysis and TaqMan PCR results showed that FCL-II can upregulate the expression of four breast-cancer-related, lowly expressed miRNAs and downregulate the expression of three breast-cancer-related, highly expressed miRNAs (>2.5-fold). FCL-II resulted in enhanced treatment effects greater than AS1411 in animal experiments (p < 0.01). The computational results further proved that FCL-II exhibits more structural advantages than AS1411 for binding to the target protein nucleolin, indicating its great potential in antitumor therapy.
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Affiliation(s)
- Xinmeng Fan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Lidan Sun
- Hubei Key Laboratory of Tumor Microenvironment and Immunotherapy, China Three Gorges University Medical College, Yichang 443002, PR China
| | - Kunfeng Li
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Xiantao Yang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Baobin Cai
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Yanfen Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Yuejie Zhu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Yuan Ma
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Zhu Guan
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Yun Wu
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Lihe Zhang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China
| | - Zhenjun Yang
- State Key Laboratory of Natural and Biomimetic Drugs, School of Pharmaceutical Sciences, Peking University, Beijing 100191, PR China.
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26
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Liang H, Chen X, Yin Q, Ruan D, Zhao X, Zhang C, McNutt MA, Yin Y. PTENβ is an alternatively translated isoform of PTEN that regulates rDNA transcription. Nat Commun 2017; 8:14771. [PMID: 28332494 PMCID: PMC5376652 DOI: 10.1038/ncomms14771] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Accepted: 01/27/2017] [Indexed: 12/17/2022] Open
Abstract
PTEN is a critical tumour suppressor that is frequently mutated in human cancer. We have previously identified a CUG initiated PTEN isoform designated PTENα, which functions in mitochondrial bioenergetics. Here we report the identification of another N-terminal extended PTEN isoform, designated PTENβ. PTENβ translation is initiated from an AUU codon upstream of and in-frame with the AUG initiation sequence for canonical PTEN. We show that the Kozak context and a downstream hairpin structure are critical for this alternative initiation. PTENβ localizes predominantly in the nucleolus, and physically associates with and dephosphorylates nucleolin, which is a multifunctional nucleolar phosphoprotein. Disruption of PTENβ alters rDNA transcription and promotes ribosomal biogenesis, and this effect can be reversed by re-introduction of PTENβ. Our data show that PTENβ regulates pre-rRNA synthesis and cellular proliferation. These results demonstrate the complexity of the PTEN protein family and the diversity of its functions.
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Affiliation(s)
- Hui Liang
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Xi Chen
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Qi Yin
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Danhui Ruan
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Xuyang Zhao
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Cong Zhang
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Michael A. McNutt
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
| | - Yuxin Yin
- Institute of Systems Biomedicine, Department of Pathology, School of Basic Medicine, Beijing Key Laboratory of Tumor Systems Biology, Peking-Tsinghua Center of Life Sciences, Peking University Health Science Center, Beijing 100191, China
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27
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Wolfson E, Goldenberg M, Solomon S, Frishberg A, Pinkas-Kramarski R. Nucleolin-binding by ErbB2 enhances tumorigenicity of ErbB2-positive breast cancer. Oncotarget 2016; 7:65320-65334. [PMID: 27542246 PMCID: PMC5323158 DOI: 10.18632/oncotarget.11323] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Accepted: 08/01/2016] [Indexed: 11/29/2022] Open
Abstract
ErbB2 is an important member of the ErbB family, which activates growth and proliferation signaling pathways. ErbB2 is often overexpressed in various malignancies, especially in breast cancer, and is a common target for anti-cancer drugs. Breast cancer is currently one of the leading mortality causes in women, and acquired resistance to ErbB2-targeted therapies is a major obstacle in its treatment. Thus, understanding ErbB2-mediated signaling is crucial for further development of anti-cancer therapeutics and disease treatment. Previously, we have reported that the ErbB receptors interact with the major nucleolar protein nucleolin. In addition to its function in the nucleoli of cells, nucleolin participates in various cellular processes at the cytoplasm and cell-surface. Deregulated nucleolin is frequently overexpressed on the membrane of cancer cells. Here, we show that nucleolin increases colony formation and anchorage-independent growth of ErbB2-overexpressing cells. Importantly, this enhanced tumorigenicity also occurs in human ErbB2-positive breast cancer patients; namely, nucleolin overexpression in these patients is associated with reduced patient survival rates and increased disease-risk. ErbB2-nucleolin complexes are formed endogenously in both normal and cancer cells, and their effect on tumorigenicity is mediated through activation of ErbB2 signaling. Accordingly, nucleolin inhibition reduces cell viability and ErbB2 activation in ErbB2-positive cancer cells.
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Affiliation(s)
- Eya Wolfson
- Department of Neurobiology, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Maria Goldenberg
- Department of Neurobiology, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Shira Solomon
- Department of Neurobiology, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Amit Frishberg
- Department of Cell Research and Immunology, Tel-Aviv University, Ramat-Aviv, 69978, Israel
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28
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Pavan ICB, Yokoo S, Granato DC, Meneguello L, Carnielli CM, Tavares MR, do Amaral CL, de Freitas LB, Paes Leme AF, Luchessi AD, Simabuco FM. Different interactomes for p70-S6K1 and p54-S6K2 revealed by proteomic analysis. Proteomics 2016; 16:2650-2666. [PMID: 27493124 DOI: 10.1002/pmic.201500249] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2015] [Revised: 06/28/2016] [Accepted: 08/03/2016] [Indexed: 01/04/2023]
Abstract
S6Ks are major effectors of the mTOR (mammalian target of rapamycin) pathway, signaling for increased protein synthesis and cell growth in response to insulin, AMP/ATP levels, and amino acids. Deregulation of this pathway has been related to disorders and diseases associated with metabolism, such as obesity, diabetes, and cancer. S6K family is composed of two main members, S6K1 and S6K2, which comprise different isoforms resulted from alternative splicing or alternative start codon use. Although important molecular functions have been associated with p70-S6K1, the most extensively studied isoform, the S6K2 counterpart lacks information. In the present study, we performed immunoprecipitation assays followed by mass spectrometry (MS) analysis of FLAG-tagged p70-S6K1 and p54-S6K2 interactomes, after expression in HEK293 cells. Protein lists were submitted to CRAPome (Contaminant Repository for Affinity Purification) and SAINT (Significance Analysis of INTeractome) analysis, which allowed the identification of high-scoring interactions. By a comparative approach, p70-S6K1 interacting proteins were predominantly related to "cytoskeleton" and "stress response," whereas p54-S6K2 interactome was more associated to "transcription," "splicing," and "ribosome biogenesis." Moreover, we have found evidences for new targets or regulators of the S6K protein family, such as proteins NCL, NPM1, eIF2α, XRCC6, PARP1, and ILF2/ILF3 complex. This study provides new information about the interacting networks of S6Ks, which may contribute for future approaches to a better understanding of the mTOR/S6K pathway.
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Affiliation(s)
- Isadora C B Pavan
- Laboratory of Metabolic Disorders, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Sami Yokoo
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, São Paulo, Brazil
| | - Daniela C Granato
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, São Paulo, Brazil
| | - Letícia Meneguello
- Laboratory of Biotechnology, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Carolina M Carnielli
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, São Paulo, Brazil
| | - Mariana R Tavares
- Laboratory of Metabolic Disorders, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Camila L do Amaral
- Laboratory of Metabolic Disorders, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Lidia B de Freitas
- Laboratory of Metabolic Disorders, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Adriana F Paes Leme
- Brazilian Biosciences National Laboratory, Brazilian Center for Research in Energy and Materials, Campinas, São Paulo, Brazil
| | - Augusto D Luchessi
- Laboratory of Biotechnology, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil
| | - Fernando M Simabuco
- Laboratory of Metabolic Disorders, School of Applied Sciences, University of Campinas, Limeira, São Paulo, Brazil.
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29
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Li Q, Zhu Y, Hou L, Wang J, Hu G, Fang X, Hu Y, Tao T, Wei X, Tang H, Huang B, Hu W. C23 promotes tumorigenesis via suppressing p53 activity. Oncotarget 2016; 7:58274-58285. [PMID: 27506938 PMCID: PMC5295430 DOI: 10.18632/oncotarget.11071] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Accepted: 07/18/2016] [Indexed: 01/22/2023] Open
Abstract
C23 is an abundant and multi-functional protein, which plays an important role in various biological processes, including ribosome biogenesis and maturation, cell cycle checkpoints and transcriptional regulation [1, 2]. However, the role of C23 in controlling tumorigenesis has not been well defined. Here we report that C23 is highly expressed in cancer cells and the elevated expression of C23 facilitates cancer cell proliferation in vitro and tumor xenograft growth in vivo. Notably, C23 binds to p53 through its GAR domain and suppresses the transcriptional activity of p53 under DNA damage and hypoxia. Moreover, the GAR domain is critical for C23-mediated tumor cell proliferation both in vitro and in vivo. Our findings reveal a novel role of C23 in tumorigenesis and suggest that C23 may represent a potential therapeutic target for treating malignancy.
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Affiliation(s)
- Qun Li
- Department of Immunology, Anhui Medical University, Hefei, China
| | - Yan Zhu
- Department of Anesthesiology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Lili Hou
- Department of Clinical Nutriology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
| | - Juan Wang
- Department of Molecular Biology, Shanxi Cancer Hospital and Institute, Affiliated Hospital of Shanxi Medical University, Taiyuan, China
| | - Guilin Hu
- School of Life Sciences, Anhui Medical University, Hefei, China
| | - Xing Fang
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Yamin Hu
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Tingting Tao
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Xin Wei
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Haitao Tang
- School of Pharmacy, Anhui Medical University, Hefei, China
| | - Baojun Huang
- Department of Immunology, Anhui Medical University, Hefei, China
| | - Wanglai Hu
- Department of Immunology, Anhui Medical University, Hefei, China
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Iden M, Fye S, Li K, Chowdhury T, Ramchandran R, Rader JS. The lncRNA PVT1 Contributes to the Cervical Cancer Phenotype and Associates with Poor Patient Prognosis. PLoS One 2016; 11:e0156274. [PMID: 27232880 PMCID: PMC4883781 DOI: 10.1371/journal.pone.0156274] [Citation(s) in RCA: 120] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2015] [Accepted: 05/11/2016] [Indexed: 12/14/2022] Open
Abstract
The plasmacytoma variant translocation 1 gene (PVT1) is an lncRNA that has been designated as an oncogene due to its contribution to the phenotype of multiple cancers. Although the mechanism by which PVT1 influences disease processes has been studied in multiple cancer types, its role in cervical tumorigenesis remains unknown. Thus, the present study was designed to investigate the role of PVT1 in cervical cancer in vitro and in vivo. PVT1 expression was measured by quantitative PCR (qPCR) in 121 invasive cervical carcinoma (ICC) samples, 30 normal cervix samples, and cervical cell lines. Functional assays were carried out using both siRNA and LNA-mediated knockdown to examine PVT1's effects on cervical cancer cell proliferation, migration and invasion, apoptosis, and cisplatin resistance. Our results demonstrate that PVT1 expression is significantly increased in ICC tissue versus normal cervix and that higher expression of PVT1 correlates with poorer overall survival. In cervical cancer cell lines, PVT1 knockdown resulted in significantly decreased cell proliferation, migration and invasion, while apoptosis and cisplatin cytotoxicity were significantly increased in these cells. Finally, we show that PVT1 expression is augmented in response to hypoxia and immune response stimulation and that this lncRNA associates with the multifunctional and stress-responsive protein, Nucleolin. Collectively, our results provide strong evidence for an oncogenic role of PVT1 in cervical cancer and lend insight into potential mechanisms by which PVT1 overexpression helps drive cervical carcinogenesis.
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Affiliation(s)
- Marissa Iden
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - Samantha Fye
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - Keguo Li
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - Tamjid Chowdhury
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - Ramani Ramchandran
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
- Department of Pediatrics, Medical College of Wisconsin, Milwaukee, WI, United States of America
| | - Janet S. Rader
- Department of Obstetrics and Gynecology, Medical College of Wisconsin, Milwaukee, WI, United States of America
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Salvetti A, Couté Y, Epstein A, Arata L, Kraut A, Navratil V, Bouvet P, Greco A. Nuclear Functions of Nucleolin through Global Proteomics and Interactomic Approaches. J Proteome Res 2016; 15:1659-69. [PMID: 27049334 DOI: 10.1021/acs.jproteome.6b00126] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
Nucleolin (NCL) is a major component of the cell nucleolus, which has the ability to rapidly shuttle to several other cells' compartments. NCL plays important roles in a variety of essential functions, among which are ribosome biogenesis, gene expression, and cell growth. However, the precise mechanisms underlying NCL functions are still unclear. Our study aimed to provide new information on NCL functions via the identification of its nuclear interacting partners. Using an interactomics approach, we identified 140 proteins co-purified with NCL, among which 100 of them were specifically found to be associated with NCL after RNase digestion. The functional classification of these proteins confirmed the prominent role of NCL in ribosome biogenesis and additionally revealed the possible involvement of nuclear NCL in several pre-mRNA processing pathways through its interaction with RNA helicases and proteins participating in pre-mRNA splicing, transport, or stability. NCL knockdown experiments revealed that NCL regulates the localization of EXOSC10 and the amount of ZC3HAV1, two components of the RNA exosome, further suggesting its involvement in the control of mRNA stability. Altogether, this study describes the first nuclear interactome of human NCL and provides the basis for further understanding the mechanisms underlying the essential functions of this nucleolar protein.
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Affiliation(s)
- Anna Salvetti
- International Center for Infectiology Research (CIRI), Inserm U1111, CNRS UMR5308 , 69007 Lyon, France
- Ecole Normale Supérieure de Lyon , 69007 Lyon, France
- Labex Ecofect Université de Lyon , 69007 Lyon, France
| | - Yohann Couté
- Université Grenoble Alpes , 38000 Grenoble, France
- CEA, BIG-BGE , 38000 Grenoble, France
- INSERM, BGE , 38000 Grenoble, France
| | - Alberto Epstein
- International Center for Infectiology Research (CIRI), Inserm U1111, CNRS UMR5308 , 69007 Lyon, France
- Ecole Normale Supérieure de Lyon , 69007 Lyon, France
- Labex Ecofect Université de Lyon , 69007 Lyon, France
| | - Loredana Arata
- Subdepartment of Molecular Genetics, Public Health Institute of Chile , Santiago, Chile
| | - Alexandra Kraut
- Université Grenoble Alpes , 38000 Grenoble, France
- CEA, BIG-BGE , 38000 Grenoble, France
- INSERM, BGE , 38000 Grenoble, France
| | - Vincent Navratil
- Pôle Rhône Alpes de Bioinformatique (PRABI), Université Lyon 1 , 69100 Villeurbanne, France
| | - Philippe Bouvet
- Ecole Normale Supérieure de Lyon , 69007 Lyon, France
- Centre de Recherche en Cancérologie de Lyon (CRCL), INSERM U1052, CNRS UMR5286 , 69003 Lyon, France
| | - Anna Greco
- International Center for Infectiology Research (CIRI), Inserm U1111, CNRS UMR5308 , 69007 Lyon, France
- Ecole Normale Supérieure de Lyon , 69007 Lyon, France
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Stepanova V, Jayaraman PS, Zaitsev SV, Lebedeva T, Bdeir K, Kershaw R, Holman KR, Parfyonova YV, Semina EV, Beloglazova IB, Tkachuk VA, Cines DB. Urokinase-type Plasminogen Activator (uPA) Promotes Angiogenesis by Attenuating Proline-rich Homeodomain Protein (PRH) Transcription Factor Activity and De-repressing Vascular Endothelial Growth Factor (VEGF) Receptor Expression. J Biol Chem 2016; 291:15029-45. [PMID: 27151212 DOI: 10.1074/jbc.m115.678490] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2015] [Indexed: 01/09/2023] Open
Abstract
Urokinase-type plasminogen activator (uPA) regulates angiogenesis and vascular permeability through proteolytic degradation of extracellular matrix and intracellular signaling initiated upon its binding to uPAR/CD87 and other cell surface receptors. Here, we describe an additional mechanism by which uPA regulates angiogenesis. Ex vivo VEGF-induced vascular sprouting from Matrigel-embedded aortic rings isolated from uPA knock-out (uPA(-/-)) mice was impaired compared with vessels emanating from wild-type mice. Endothelial cells isolated from uPA(-/-) mice show less proliferation and migration in response to VEGF than their wild type counterparts or uPA(-/-) endothelial cells in which expression of wild type uPA had been restored. We reported previously that uPA is transported from cell surface receptors to nuclei through a mechanism that requires its kringle domain. Intranuclear uPA modulates gene transcription by binding to a subset of transcription factors. Here we report that wild type single-chain uPA, but not uPA variants incapable of nuclear transport, increases the expression of cell surface VEGF receptor 1 (VEGFR1) and VEGF receptor 2 (VEGFR2) by translocating to the nuclei of ECs. Intranuclear single-chain uPA binds directly to and interferes with the function of the transcription factor hematopoietically expressed homeodomain protein or proline-rich homeodomain protein (HHEX/PRH), which thereby lose their physiologic capacity to repress the activity of vehgr1 and vegfr2 gene promoters. These studies identify uPA-dependent de-repression of vegfr1 and vegfr2 gene transcription through binding to HHEX/PRH as a novel mechanism by which uPA mediates the pro-angiogenic effects of VEGF and identifies a potential new target for control of pathologic angiogenesis.
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Affiliation(s)
| | - Padma-Sheela Jayaraman
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B152TT, United Kingdom
| | - Sergei V Zaitsev
- Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania 19104
| | | | - Khalil Bdeir
- From the Departments of Pathology and Laboratory Medicine and
| | - Rachael Kershaw
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham B152TT, United Kingdom
| | - Kelci R Holman
- College of Arts and Sciences, Drexel University, Philadelphia, Pennsylvania 19104
| | - Yelena V Parfyonova
- Russian Cardiology Research Center, Moscow 121552, Russia, School (Faculty) of Fundamental Medicine, Lomonosov Moscow State University, Moscow, 117192, Russia, and
| | - Ekaterina V Semina
- Russian Cardiology Research Center, Moscow 121552, Russia, School (Faculty) of Fundamental Medicine, Lomonosov Moscow State University, Moscow, 117192, Russia, and
| | | | - Vsevolod A Tkachuk
- Russian Cardiology Research Center, Moscow 121552, Russia, School (Faculty) of Fundamental Medicine, Lomonosov Moscow State University, Moscow, 117192, Russia, and
| | - Douglas B Cines
- From the Departments of Pathology and Laboratory Medicine and
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Leaderer D, Cashman SM, Kumar-Singh R. G-quartet oligonucleotide mediated delivery of proteins into photoreceptors and retinal pigment epithelium via intravitreal injection. Exp Eye Res 2016; 145:380-392. [PMID: 26923800 PMCID: PMC5334003 DOI: 10.1016/j.exer.2016.02.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 02/20/2016] [Accepted: 02/24/2016] [Indexed: 12/27/2022]
Abstract
There is currently no available method to efficiently deliver proteins across the plasma membrane of photoreceptor or retinal pigment epithelium (RPE) cells in vivo. Thus, current clinical application of recombinant proteins in ophthalmology is limited to the use of proteins that perform their biological function extracellularly. The ability to traverse biological membranes would enable the mobilization of a significantly larger number of proteins with previously well characterized properties. Nucleolin is abundantly present on the surface of rapidly dividing cells including cancer cells. Surprisingly, nucleolin is also present on the surface of photoreceptor cell bodies. Here we investigated whether nucleolin can be utilized as a gateway for the delivery of proteins into retinal cells following intravitreal injection. AS1411 is a G-quartet aptamer capable of targeting nucleolin. Subsequent to intravitreal injection, fluorescently labeled AS1411 localized to various retinal cell types including the photoreceptors and RPE. AS1411 linked to streptavidin (a ∼50 kDa protein) via a biotin bridge enabled the uptake of Streptavidin into photoreceptors and RPE. AS1411-Streptavidin conjugate applied topically to the cornea allowed for uptake of the conjugate into the nucleus and cytoplasm of corneal endothelial cells. Clinical relevance of AS1411 as a delivery vehicle was strongly indicated by demonstration of the presence of cell surface nucleolin on the photoreceptors, inner neurons and ganglion cells of human retina. These data support exploration of AS1411 as a means of delivering therapeutic proteins to diseased retina.
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Affiliation(s)
- Derek Leaderer
- Department of Ophthalmology, Program in Genetics, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA
| | - Siobhan M Cashman
- Department of Ophthalmology, Program in Genetics, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA
| | - Rajendra Kumar-Singh
- Department of Ophthalmology, Program in Genetics, Sackler School of Graduate Biomedical Sciences, Tufts University School of Medicine, 136 Harrison Avenue, Boston, MA 02111, USA.
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Klinge CM. miRNAs regulated by estrogens, tamoxifen, and endocrine disruptors and their downstream gene targets. Mol Cell Endocrinol 2015; 418 Pt 3:273-97. [PMID: 25659536 PMCID: PMC4523495 DOI: 10.1016/j.mce.2015.01.035] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/17/2014] [Revised: 01/22/2015] [Accepted: 01/23/2015] [Indexed: 02/07/2023]
Abstract
MicroRNAs (miRNAs) are short (22 nucleotides), single-stranded, non-coding RNAs that form complimentary base-pairs with the 3' untranslated region of target mRNAs within the RNA-induced silencing complex (RISC) and block translation and/or stimulate mRNA transcript degradation. The non-coding miRBase (release 21, June 2014) reports that human genome contains ∼ 2588 mature miRNAs which regulate ∼ 60% of human protein-coding mRNAs. Dysregulation of miRNA expression has been implicated in estrogen-related diseases including breast cancer and endometrial cancer. The mechanism for estrogen regulation of miRNA expression and the role of estrogen-regulated miRNAs in normal homeostasis, reproduction, lactation, and in cancer is an area of great research and clinical interest. Estrogens regulate miRNA transcription through estrogen receptors α and β in a tissue-specific and cell-dependent manner. This review focuses primarily on the regulation of miRNA expression by ligand-activated ERs and their bona fide gene targets and includes miRNA regulation by tamoxifen and endocrine disrupting chemicals (EDCs) in breast cancer and cell lines.
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Affiliation(s)
- Carolyn M Klinge
- Department of Biochemistry & Molecular Biology, Center for Genetics and Molecular Medicine, University of Louisville School of Medicine, Louisville, KY 40292, USA.
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35
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Hernández-Ortega K, Garcia-Esparcia P, Gil L, Lucas JJ, Ferrer I. Altered Machinery of Protein Synthesis in Alzheimer's: From the Nucleolus to the Ribosome. Brain Pathol 2015; 26:593-605. [PMID: 26512942 DOI: 10.1111/bpa.12335] [Citation(s) in RCA: 141] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Accepted: 10/22/2015] [Indexed: 12/17/2022] Open
Abstract
Ribosomes and protein synthesis have been reported to be altered in the cerebral cortex at advanced stages of Alzheimer's disease (AD). Modifications in the hippocampus with disease progression have not been assessed. Sixty-seven cases including middle-aged (MA) and AD stages I-VI were analyzed. Nucleolar chaperones nucleolin, nucleophosmin and nucleoplasmin 3, and upstream binding transcription factor RNA polymerase I gene (UBTF) mRNAs are abnormally regulated and their protein levels reduced in AD. Histone modifications dimethylated histone H3K9 (H3K9me2) and acetylated histone H3K12 (H3K12ac) are decreased in CA1. Nuclear tau declines in CA1 and dentate gyrus (DG), and practically disappears in neurons with neurofibrillary tangles. Subunit 28 ribosomal RNA (28S rRNA) expression is altered in CA1 and DG in AD. Several genes encoding ribosomal proteins are abnormally regulated and protein levels of translation initiation factors eIF2α, eIF3η and eIF5, and elongation factor eEF2, are altered in the CA1 region in AD. These findings show alterations in the protein synthesis machinery in AD involving the nucleolus, nucleus and ribosomes in the hippocampus in AD some of them starting at first stages (I-II) preceding neuron loss. These changes may lie behind reduced numbers of dendritic branches and reduced synapses of CA1 and DG neurons which cause hippocampal atrophy.
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Affiliation(s)
- Karina Hernández-Ortega
- Institute of Neuropathology, Service of Pathologic Anatomy, IDIBELL-Bellvitge University Hospital, University of Barcelona, Hospitalet de Llobregat, Spain.,Neuropathology, CIBERNED (Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas), Madrid, Spain
| | - Paula Garcia-Esparcia
- Institute of Neuropathology, Service of Pathologic Anatomy, IDIBELL-Bellvitge University Hospital, University of Barcelona, Hospitalet de Llobregat, Spain.,Neuropathology, CIBERNED (Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas), Madrid, Spain
| | - Laura Gil
- Department of Genetics, Medical School, Alfonso X el Sabio University (UAX), Villanueva de la Cañada; Centro de Investigaciones Biologicas (CIB), CSIC, Madrid, Spain
| | - José J Lucas
- Neuropathology, CIBERNED (Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas), Madrid, Spain.,Department of Molecular Biology, Center for Molecular Biology "Severo Ochoa" (CBMSO) CSIC/UAM, Madrid, 28049, Spain
| | - Isidre Ferrer
- Institute of Neuropathology, Service of Pathologic Anatomy, IDIBELL-Bellvitge University Hospital, University of Barcelona, Hospitalet de Llobregat, Spain.,Neuropathology, CIBERNED (Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas), Madrid, Spain
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Garcia-Esparcia P, Hernández-Ortega K, Koneti A, Gil L, Delgado-Morales R, Castaño E, Carmona M, Ferrer I. Altered machinery of protein synthesis is region- and stage-dependent and is associated with α-synuclein oligomers in Parkinson's disease. Acta Neuropathol Commun 2015; 3:76. [PMID: 26621506 PMCID: PMC4666041 DOI: 10.1186/s40478-015-0257-4] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Accepted: 11/14/2015] [Indexed: 01/17/2023] Open
Abstract
INTRODUCTION Parkinson's disease (PD) is characterized by the accumulation of abnormal α-synuclein in selected regions of the brain following a gradient of severity with disease progression. Whether this is accompanied by globally altered protein synthesis is poorly documented. The present study was carried out in PD stages 1-6 of Braak and middle-aged (MA) individuals without alterations in brain in the substantia nigra, frontal cortex area 8, angular gyrus, precuneus and putamen. RESULTS Reduced mRNA expression of nucleolar proteins nucleolin (NCL), nucleophosmin (NPM1), nucleoplasmin 3 (NPM3) and upstream binding transcription factor (UBF), decreased NPM1 but not NPM3 nucleolar protein immunostaining in remaining neurons; diminished 18S rRNA, 28S rRNA; reduced expression of several mRNAs encoding ribosomal protein (RP) subunits; and altered protein levels of initiation factor eIF3 and elongation factor eEF2 of protein synthesis was found in the substantia nigra in PD along with disease progression. Although many of these changes can be related to neuron loss in the substantia nigra, selective alteration of certain factors indicates variable degree of vulnerability of mRNAs, rRNAs and proteins in degenerating sustantia nigra. NPM1 mRNA and 18S rRNA was increased in the frontal cortex area 8 at stage 5-6; modifications were less marked and region-dependent in the angular gyrus and precuneus. Several RPs were abnormally regulated in the frontal cortex area 8 and precuneus, but only one RP in the angular gyrus, in PD. Altered levels of eIF3 and eIF1, and decrease eEF1A and eEF2 protein levels were observed in the frontal cortex in PD. No modifications were found in the putamen at any time of the study except transient modifications in 28S rRNA and only one RP mRNA at stages 5-6. These observations further indicate marked region-dependent and stage-dependent alterations in the cerebral cortex in PD. Altered solubility and α-synuclein oligomer formation, assessed in total homogenate fractions blotted with anti-α-synuclein oligomer-specific antibody, was demonstrated in the substantia nigra and frontal cortex, but not in the putamen, in PD. Dramatic increase in α-synuclein oligomers was also seen in fluorescent-activated cell sorter (FACS)-isolated nuclei in the frontal cortex in PD. CONCLUSIONS Altered machinery of protein synthesis is altered in the substantia nigra and cerebral cortex in PD being the frontal cortex area 8 more affected than the angular gyrus and precuneus; in contrast, pathways of protein synthesis are apparently preserved in the putamen. This is associated with the presence of α-synuclein oligomeric species in total homogenates; substantia nigra and frontal cortex are enriched, albeit with different band patterns, in α-synuclein oligomeric species, whereas α-synuclein oligomers are not detected in the putamen.
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Affiliation(s)
- Paula Garcia-Esparcia
- Institute of Neuropathology, Bellvitge University Hospital, University of Barcelona, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat; Biomedical Research Center of Neurodegenerative Diseases (CIBERNED), Barcelona, Spain
| | - Karina Hernández-Ortega
- Institute of Neuropathology, Bellvitge University Hospital, University of Barcelona, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat; Biomedical Research Center of Neurodegenerative Diseases (CIBERNED), Barcelona, Spain
| | - Anusha Koneti
- Institute of Neuropathology, Bellvitge University Hospital, University of Barcelona, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat; Biomedical Research Center of Neurodegenerative Diseases (CIBERNED), Barcelona, Spain
| | - Laura Gil
- Department of Genetics, Medical School, Alfonso X el Sabio University, Villanueva de la Cañada, Madrid, Spain
| | - Raul Delgado-Morales
- Cancer Epigenetics and Biology Program, IDIBELL, Hospitalet de Llobregat, Barcelona, Spain
| | - Ester Castaño
- Biology-Bellvitge Unit, Scientific and Technological Centers-University of Barcelona (CCiTUB), Hospitalet de Llobregat, Barcelona, Spain
| | - Margarita Carmona
- Institute of Neuropathology, Bellvitge University Hospital, University of Barcelona, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat; Biomedical Research Center of Neurodegenerative Diseases (CIBERNED), Barcelona, Spain
| | - Isidre Ferrer
- Institute of Neuropathology, Bellvitge University Hospital, University of Barcelona, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat; Biomedical Research Center of Neurodegenerative Diseases (CIBERNED), Barcelona, Spain.
- Institute of Neuropathology, Service of Pathologic Anatomy, Bellvitge University Hospital, carrer Feixa Llarga s/n, 08907, Hospitalet de Llobregat, Spain.
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Muller M, Hutin S, Marigold O, Li KH, Burlingame A, Glaunsinger BA. A ribonucleoprotein complex protects the interleukin-6 mRNA from degradation by distinct herpesviral endonucleases. PLoS Pathog 2015; 11:e1004899. [PMID: 25965334 PMCID: PMC4428876 DOI: 10.1371/journal.ppat.1004899] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2015] [Accepted: 04/20/2015] [Indexed: 11/21/2022] Open
Abstract
During lytic Kaposi's sarcoma-associated herpesvirus (KSHV) infection, the viral endonuclease SOX promotes widespread degradation of cytoplasmic messenger RNA (mRNA). However, select mRNAs escape SOX-induced cleavage and remain robustly expressed. Prominent among these is interleukin-6 (IL-6), a growth factor important for survival of KSHV infected B cells. IL-6 escape is notable because it contains a sequence within its 3' untranslated region (UTR) that can confer protection when transferred to a SOX-targeted mRNA, and thus overrides the endonuclease targeting mechanism. Here, we pursued how this protective RNA element functions to maintain mRNA stability. Using affinity purification and mass spectrometry, we identified a set of proteins that associate specifically with the protective element. Although multiple proteins contributed to the escape mechanism, depletion of nucleolin (NCL) most severely impacted protection. NCL was re-localized out of the nucleolus during lytic KSHV infection, and its presence in the cytoplasm was required for protection. After loading onto the IL-6 3' UTR, NCL differentially bound to the translation initiation factor eIF4H. Disrupting this interaction, or depleting eIF4H, reinstated SOX targeting of the RNA, suggesting that interactions between proteins bound to distant regions of the mRNA are important for escape. Finally, we found that the IL-6 3' UTR was also protected against mRNA degradation by the vhs endonuclease encoded by herpes simplex virus, despite the fact that its mechanism of mRNA targeting is distinct from SOX. These findings highlight how a multitude of RNA-protein interactions can impact endonuclease targeting, and identify new features underlying the regulation of the IL-6 mRNA.
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Affiliation(s)
- Mandy Muller
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Stephanie Hutin
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Oliver Marigold
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, United States of America
| | - Kathy H. Li
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, United States of America
| | - Al Burlingame
- Department of Pharmaceutical Chemistry, University of California, San Francisco, San Francisco, California, United States of America
| | - Britt A. Glaunsinger
- Department of Plant and Microbial Biology, University of California, Berkeley, Berkeley, California, United States of America
- Department of Cell and Molecular Biology, University of California, Berkeley, Berkeley, California, United States of America
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38
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Zhang D, Liang Y, Xie Q, Gao G, Wei J, Huang H, Li J, Gao J, Huang C. A novel post-translational modification of nucleolin, SUMOylation at Lys-294, mediates arsenite-induced cell death by regulating gadd45α mRNA stability. J Biol Chem 2015; 290:4784-4800. [PMID: 25561743 PMCID: PMC4335216 DOI: 10.1074/jbc.m114.598219] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2014] [Revised: 12/30/2014] [Indexed: 11/06/2022] Open
Abstract
Nucleolin is a ubiquitously expressed protein and participates in many important biological processes, such as cell cycle regulation and ribosomal biogenesis. The activity of nucleolin is regulated by intracellular localization and post-translational modifications, including phosphorylation, methylation, and ADP-ribosylation. Small ubiquitin-like modifier (SUMO) is a category of recently verified forms of post-translational modifications and exerts various effects on the target proteins. In the studies reported here, we discovered SUMOylational modification of human nucleolin protein at Lys-294, which facilitated the mRNA binding property of nucleolin by maintaining its nuclear localization. In response to arsenic exposure, nucleolin-SUMO was induced and promoted its binding with gadd45α mRNA, which increased gadd45α mRNA stability and protein expression, subsequently causing GADD45α-mediated cell death. On the other hand, ectopic expression of Mn-SOD attenuated the arsenite-generated superoxide radical level, abrogated nucleolin-SUMO, and in turn inhibited arsenite-induced apoptosis by reducing GADD45α expression. Collectively, our results for the first time demonstrate that nucleolin-SUMO at K294R plays a critical role in its nucleus sequestration and gadd45α mRNA binding activity. This novel biological function of nucleolin is distinct from its conventional role as a proto-oncogene. Therefore, our findings here not only reveal a new modification of nucleolin protein and its novel functional paradigm in mRNA metabolism but also expand our understanding of the dichotomous roles of nucleolin in terms of cancer development, which are dependent on multiple intracellular conditions and consequently the appropriate regulations of its modifications, including SUMOylation.
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Affiliation(s)
- Dongyun Zhang
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987 and; Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Yuguang Liang
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987 and
| | - Qipeng Xie
- Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Guangxun Gao
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987 and
| | - Jinlong Wei
- Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Haishan Huang
- Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Jingxia Li
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987 and
| | - Jimin Gao
- Zhejiang Provincial Key Laboratory for Technology and Application of Model Organisms, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
| | - Chuanshu Huang
- Nelson Institute of Environmental Medicine, New York University School of Medicine, Tuxedo, New York 10987 and.
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Oh HJ, Choung HW, Lee HK, Park SJ, Lee JH, Lee DS, Seo BM, Park JC. CPNE7, a preameloblast-derived factor, regulates odontoblastic differentiation of mesenchymal stem cells. Biomaterials 2015; 37:208-17. [PMID: 25453951 DOI: 10.1016/j.biomaterials.2014.10.016] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Accepted: 10/02/2014] [Indexed: 10/24/2022]
Abstract
Tooth development involves sequential interactions between dental epithelial and mesenchymal cells. Our previous studies demonstrated that preameloblast-conditioned medium (PA-CM) induces the odontogenic differentiation of human dental pulp cells (hDPCs), and the novel protein Cpne7 in PA-CM was suggested as a candidate signaling molecule. In the present study, we investigated biological function and mechanisms of Cpne7 in regulation of odontoblast differentiation. Cpne7 was expressed in preameloblasts and secreted extracellularly during ameloblast differentiation. After secretion, Cpne7 protein was translocated to differentiating odontoblasts. In odontoblasts, Cpne7 promoted odontoblastic markers and the expression of Dspp in vitro. Cpne7 also induced odontoblast differentiation and promoted dentin/pulp-like tissue formation in hDPCs in vivo. Moreover, Cpne7 induced differentiation into odontoblasts of non-dental mesenchymal stem cells in vitro, and promoted formation of dentin-like tissues including the structure of dentinal tubules in vivo. Mechanistically, Cpne7 interacted with Nucleolin and modulated odontoblast differentiation via the control of Dspp expression. These results suggest Cpne7 is a diffusible signaling molecule that is secreted by preameloblasts, and regulates the differentiation of mesenchymal cells of dental or non-dental origin into odontoblasts.
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Affiliation(s)
- Hyun-Jung Oh
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Han-Wool Choung
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Hye-Kyung Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Su-Jin Park
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Ji-Hyun Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Dong-Seol Lee
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea
| | - Byoung-Moo Seo
- Department of Oral and Maxillofacial Surgery, School of Dentistry, Seoul National University, Seoul 110-749, Republic of Korea
| | - Joo-Cheol Park
- Department of Oral Histology-Developmental Biology, School of Dentistry and Dental Research Institute, BK 21, Seoul National University, Seoul 110-749, Republic of Korea.
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40
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Umate P, Tuteja N, Tuteja R. Genome-wide comprehensive analysis of human helicases. Commun Integr Biol 2014. [DOI: 10.4161/cib.13844] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
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41
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Sasvari Z, Alatriste Gonzalez P, Nagy PD. Tombusvirus-yeast interactions identify conserved cell-intrinsic viral restriction factors. FRONTIERS IN PLANT SCIENCE 2014; 5:383. [PMID: 25157258 PMCID: PMC4127529 DOI: 10.3389/fpls.2014.00383] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/10/2014] [Accepted: 07/18/2014] [Indexed: 05/23/2023]
Abstract
To combat viral infections, plants possess innate and adaptive immune pathways, such as RNA silencing, R gene and recessive gene-mediated resistance mechanisms. However, it is likely that additional cell-intrinsic restriction factors (CIRF) are also involved in limiting plant virus replication. This review discusses novel CIRFs with antiviral functions, many of them RNA-binding proteins or affecting the RNA binding activities of viral replication proteins. The CIRFs against tombusviruses have been identified in yeast (Saccharomyces cerevisiae), which is developed as an advanced model organism. Grouping of the identified CIRFs based on their known cellular functions and subcellular localization in yeast reveals that TBSV replication is limited by a wide variety of host gene functions. Yeast proteins with the highest connectivity in the network map include the well-characterized Xrn1p 5'-3' exoribonuclease, Act1p actin protein and Cse4p centromere protein. The protein network map also reveals an important interplay between the pro-viral Hsp70 cellular chaperone and the antiviral co-chaperones, and possibly key roles for the ribosomal or ribosome-associated factors. We discuss the antiviral functions of selected CIRFs, such as the RNA binding nucleolin, ribonucleases, WW-domain proteins, single- and multi-domain cyclophilins, TPR-domain co-chaperones and cellular ion pumps. These restriction factors frequently target the RNA-binding region in the viral replication proteins, thus interfering with the recruitment of the viral RNA for replication and the assembly of the membrane-bound viral replicase. Although many of the characterized CIRFs act directly against TBSV, we propose that the TPR-domain co-chaperones function as "guardians" of the cellular Hsp70 chaperone system, which is subverted efficiently by TBSV for viral replicase assembly in the absence of the TPR-domain co-chaperones.
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Affiliation(s)
| | | | - Peter D. Nagy
- *Correspondence: Peter D. Nagy, Department of Plant Pathology, University of Kentucky, 201F Plant Science Building, Lexington, KY 40546, USA e-mail:
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Kruspe S, Mittelberger F, Szameit K, Hahn U. Aptamers as drug delivery vehicles. ChemMedChem 2014; 9:1998-2011. [PMID: 25130604 DOI: 10.1002/cmdc.201402163] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2014] [Revised: 07/02/2014] [Indexed: 01/22/2023]
Abstract
The benefits of directed and selective therapy for systemic treatment are reasons for increased interest in exploiting aptamers for cell-specific drug delivery. Nucleic acid based pharmaceuticals represent an interesting and novel tool to counter human diseases. Combining inhibitory potential and cargo transfer upon internalization, nanocarriers as well as various therapeutics including siRNAs, chemotherapeutics, photosensitizers, or proteins can be imported via these synthetic nucleic acids. However, widespread clinical application is still hampered by obstacles that must be overcome. In this review, we give an overview of applications and recent advances in aptamer-mediated drug delivery. We also introduce prominent selection methods as well as useful approaches in choice of drug and conjugation method. We discuss the challenges that need to be considered and present strategies that have been applied to achieve intracellular delivery of effectors transported by readily internalized aptamers.
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Affiliation(s)
- Sven Kruspe
- Institut für Biochemie und Molekularbiologie, Universität Hamburg, Martin-Luther-King Platz 6, 20146 Hamburg (Germany)
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Su L, Zheng H, Li Z, Qiu J, Chen S, Liu J, Ou TM, Tan JH, Gu LQ, Huang ZS, Li D. Mechanistic studies on the anticancer activity of 2,4-disubstituted quinazoline derivative. Biochim Biophys Acta Gen Subj 2014; 1840:3123-30. [PMID: 25018006 DOI: 10.1016/j.bbagen.2014.07.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2014] [Revised: 06/23/2014] [Accepted: 07/02/2014] [Indexed: 12/11/2022]
Abstract
BACKGROUND Accelerated proliferation of solid tumor and hematologic cancer cells is related to accelerated transcription of ribosomal DNA by the RNA polymerase I to produce elevated level of ribosomal RNA. Therefore, down-regulation of RNA polymerase I transcription in cancer cells is an important anticancer therapeutic strategy. METHODS A variety of methods were used, including cloning, expression and purification of protein, electrophoretic mobility shift assay (EMSA), circular dichroic (CD) spectroscopy, CD-melting, isothermal titration calorimetry (ITC), chromatin immunoprecipitation (Ch-IP), RNA interference, RT-PCR, Western blot, and 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl-2H-tetrazolium bromide (MTT) cell assay. RESULTS Our results showed that 2,4-disubstituted quinazoline derivative Sysu12d could down-regulate c-myc through stabilization of c-myc promoter G-quadruplex, resulting in down-regulation of nucleolin expression. Sysu12d could also disrupt nucleolin/G-quadruplex complex. Both of the above contributed to the down-regulation of ribosomal RNA synthesis, followed by activation of p53 and then cancer cell apoptosis. CONCLUSIONS These mechanistic studies set up the basis for further development of Sysu12d as a new type of lead compound for cancer treatment. GENERAL SIGNIFICANCE 2,4-Disubstituted quinazoline derivatives may have multi-functional effect for cancer treatment.
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Affiliation(s)
- Lijuan Su
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Huaqin Zheng
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Zeng Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Jun Qiu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Siqi Chen
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Jinggong Liu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Tian-Miao Ou
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Jia-Heng Tan
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Lian-Quan Gu
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Zhi-Shu Huang
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China
| | - Ding Li
- School of Pharmaceutical Sciences, Sun Yat-sen University, Guangzhou University City, 132 Waihuan East Road, Guangzhou 510006, PR China.
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Hariharan N, Sussman MA. Stressing on the nucleolus in cardiovascular disease. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1842:798-801. [PMID: 24514103 PMCID: PMC3972279 DOI: 10.1016/j.bbadis.2013.09.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Accepted: 09/18/2013] [Indexed: 12/23/2022]
Abstract
The nucleolus is a multifunctional organelle with multiple roles involving cell proliferation, growth, survival, ribosome biogenesis and stress response signaling. Alteration of nucleolar morphology and architecture signifies an early response to increased cellular stress. This review briefly summarizes nucleolar response to cardiac stress signals and details the role played by nucleolar proteins in cardiovascular pathophysiology. This article is part of a Special Issue entitled: Role of the Nucleolus in Human Disease.
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Affiliation(s)
- Nirmala Hariharan
- Department of Biology, San Diego State University Heart Institute, San Diego State University, San Diego, CA 92182, USA
| | - Mark A Sussman
- Department of Biology, San Diego State University Heart Institute, San Diego State University, San Diego, CA 92182, USA.
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Dyshlovoy SA, Venz S, Shubina LK, Fedorov SN, Walther R, Jacobsen C, Stonik VA, Bokemeyer C, Balabanov S, Honecker F. Activity of aaptamine and two derivatives, demethyloxyaaptamine and isoaaptamine, in cisplatin-resistant germ cell cancer. J Proteomics 2013; 96:223-39. [PMID: 24269226 DOI: 10.1016/j.jprot.2013.11.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2013] [Revised: 10/02/2013] [Accepted: 11/12/2013] [Indexed: 12/25/2022]
Abstract
UNLABELLED We analyzed the effects of all three marine alkaloids aaptamine, demethyloxyaaptamine and isoaaptamine in NT2-R, a cisplatin-resistant subline of the human embryonal carcinoma cell line NT2. All aaptamines were found to be equally effective in both cell lines, excluding cross-resistance between aaptamines and cisplatin in vitro. At the inhibitory concentration (IC50), aaptamine exerted an antiproliferative effect, whereas demethyloxyaaptamine and isoaaptamine were strong inducers of apoptosis. We analyzed the changes in the proteome of NT2-R cells treated with these compounds. 16-22 proteins were found to be significantly altered, of which several were validated by Western blotting and two-dimensional Western blotting analysis. Changes in the proteome pattern frequently resulted from post-transcriptional protein modifications, i.e. phosphorylation or hypusination in the case of eIF5A. Although the lists of altered proteins were heterogeneous and compound-specific, gene ontology analyses identified rather similar profiles regarding the affected molecular functions. Ingenuity pathway analysis by IPA put the following factors in a central position of the hypothetical networks: myc and p53 for aaptamine; tumor necrosis factor (TNF) for demethyloxyaaptamine; and all three, myc, p53, and TNF for isoaaptamine. Our results represent an important step towards a better understanding of the molecular basis underlying the observed bioactivity of these promising marine compounds. BIOLOGICAL SIGNIFICANCE We characterized the mode of action of three aaptamines, marine natural compound with anti-tumor activity, using a functional proteomics approach and the cisplatin-resistant pluripotent human embryonal carcinoma cell line NT2-R. The manuscript is of particular scientific interest, as we could reveal the similarities and differences of the modes of action. Furthermore, we were able to identify several new targets of these promising compounds. We found hypusination of eIF5A to be a prominent feature exclusively of aaptamine treatment, as this was not observed upon treatment with demethyloxyaaptamine or isoaaptamine. Our results are a step towards unraveling the mode of action of these interesting compounds.
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Affiliation(s)
- Sergey A Dyshlovoy
- Department of Oncology, Haematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Laboratory of Marine Natural Products Chemistry, G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-East Branch, Russian Academy of Sciences, Vladivostok, Russian Federation
| | - Simone Venz
- Department of Medical Biochemistry and Molecular Biology, University of Greifswald, Greifswald, Germany; Interfacultary Institute of Genetics and Functional Genomics, Department of Functional Genomics, University of Greifswald, Greifswald, Germany
| | - Larisa K Shubina
- Laboratory of Marine Natural Products Chemistry, G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-East Branch, Russian Academy of Sciences, Vladivostok, Russian Federation
| | - Sergey N Fedorov
- Laboratory of Marine Natural Products Chemistry, G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-East Branch, Russian Academy of Sciences, Vladivostok, Russian Federation
| | - Reinhard Walther
- Department of Medical Biochemistry and Molecular Biology, University of Greifswald, Greifswald, Germany
| | - Christine Jacobsen
- Department of Oncology, Haematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Valentin A Stonik
- Laboratory of Marine Natural Products Chemistry, G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-East Branch, Russian Academy of Sciences, Vladivostok, Russian Federation
| | - Carsten Bokemeyer
- Department of Oncology, Haematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Stefan Balabanov
- Department of Oncology, Haematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Hamburg, Germany; Division of Hematology, University Hospital Zurich, Zurich, Switzerland
| | - Friedemann Honecker
- Department of Oncology, Haematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.
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Mulvey CM, Tudzarova S, Crawford M, Williams GH, Stoeber K, Godovac-Zimmermann J. Subcellular proteomics reveals a role for nucleo-cytoplasmic trafficking at the DNA replication origin activation checkpoint. J Proteome Res 2013; 12:1436-53. [PMID: 23320540 PMCID: PMC4261602 DOI: 10.1021/pr3010919] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Depletion of DNA replication initiation factors such as CDC7 kinase triggers the origin activation checkpoint in healthy cells and leads to a protective cell cycle arrest at the G1 phase of the mitotic cell division cycle. This protective mechanism is thought to be defective in cancer cells. To investigate how this checkpoint is activated and maintained in healthy cells, we conducted a quantitative SILAC analysis of the nuclear- and cytoplasmic-enriched compartments of CDC7-depleted fibroblasts and compared them to a total cell lysate preparation. Substantial changes in total abundance and/or subcellular location were detected for 124 proteins, including many essential proteins associated with DNA replication/cell cycle. Similar changes in protein abundance and subcellular distribution were observed for various metabolic processes, including oxidative stress, iron metabolism, protein translation and the tricarboxylic acid cycle. This is accompanied by reduced abundance of two karyopherin proteins, suggestive of reduced nuclear import. We propose that altered nucleo-cytoplasmic trafficking plays a key role in the regulation of cell cycle arrest. The results increase understanding of the mechanisms underlying maintenance of the DNA replication origin activation checkpoint and are consistent with our proposal that cell cycle arrest is an actively maintained process that appears to be distributed over various subcellular locations.
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Affiliation(s)
- Claire M. Mulvey
- Division of Medicine, University College London, Royal Free Campus, Rowland Hill Street, London NW3 2PF, United Kingdom
| | - Slavica Tudzarova
- Wolfson Institute for Biomedical Research, University College London, Gower Street, London WC1E 6BT, United Kingdom
| | - Mark Crawford
- Division of Medicine, University College London, Royal Free Campus, Rowland Hill Street, London NW3 2PF, United Kingdom
| | - Gareth H. Williams
- Research Department of Pathology and UCL Cancer Institute, Rockefeller Building, University College London, University Street, London WC1E 6JJ, United Kingdom
| | - Kai Stoeber
- Research Department of Pathology and UCL Cancer Institute, Rockefeller Building, University College London, University Street, London WC1E 6JJ, United Kingdom
| | - Jasminka Godovac-Zimmermann
- Division of Medicine, University College London, Royal Free Campus, Rowland Hill Street, London NW3 2PF, United Kingdom
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Lee B, Jin S, Choi H, Kwon JT, Kim J, Jeong J, Kwon YI, Cho C. Expression and function of the testis-predominant protein LYAR in mice. Mol Cells 2013; 35:54-60. [PMID: 23212345 PMCID: PMC3887849 DOI: 10.1007/s10059-013-2271-3] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2012] [Revised: 11/13/2012] [Accepted: 11/14/2012] [Indexed: 11/28/2022] Open
Abstract
Mammalian spermatogenesis is a complex process involving an intrinsic genetic program of germ cell-specific and -predominant genes. In the present study, we analyzed the Ly-1 reactive clone (Lyar) gene in the mouse. Lyar, which is known to be expressed abundantly in the testis, encodes a nucleolar protein that contains a LYAR-type C2HC zinc finger motif and three nuclear localization signals. We herein confirmed that Lyar is expressed predominantly in the testis, and further showed that this expression is specific to germ cells. Protein analyses with an anti-LYAR antibody demonstrated that the LYAR protein is present in spermatocytes and spermatids, but not in sperm. To assess the functional role of LYAR in vivo, we used a genetrap mutagenesis approach to establish a LYAR-null mouse model. Lyar mutant mice were born live and developed normally. Male mutant mice lacking LYAR were fully fertile and showed intact spermatogenesis. Taken together, our results demonstrate that LYAR is strongly preferred in male germ cells, but has a dispensable role in spermatogenesis and fertility.
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Affiliation(s)
- Boyeon Lee
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | - Sora Jin
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | - Heejin Choi
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | - Jun Tae Kwon
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | - Jihye Kim
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | - Juri Jeong
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
| | | | - Chunghee Cho
- School of Life Sciences, Gwangju Institute of Science and Technology, Gwangju 500-712,
Korea
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48
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Shang Y, Kakinuma S, Nishimura M, Kobayashi Y, Nagata K, Shimada Y. Interleukin-9 receptor gene is transcriptionally regulated by nucleolin in T-cell lymphoma cells. Mol Carcinog 2012; 51:619-27. [PMID: 21809393 DOI: 10.1002/mc.20834] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 06/28/2011] [Accepted: 07/06/2011] [Indexed: 01/08/2023]
Abstract
Interleukin-9 (IL-9) is a multifunctional cytokine that not only has roles in immune and inflammatory responses but also is involved in growth-promoting and anti-apoptotic activities in multiple transformed cell lines, which suggests a potential role in tumorigenesis. Over-expression of the receptor of IL-9 (IL-9R) occurs in several types of human leukemias and in radiation-induced mouse T-cell lymphoma (TL). The molecular mechanism that regulates transcription of the IL-9R gene (Il9r) during leukemogenesis is, however, not well understood. Using a mouse TL cell line that has high expression of Il9r, we sought to dissect its promoter structure. Here we show that the active promoter for Il9r is located in the 5'-flanking AT-rich region. Chromatin immunoprecipitation showed the opening of chromatin structure of the promoter region coupled with nucleolin binding in vivo. Immunohistochemical analysis confirmed the increased localization of nucleolin in the nuclei of TL cells. These data indicate that increased expression of Il9r is associated with an increased binding of nucleolin, coupled with chromatin opening, to an AT-rich region in the 5'-flanking region of Il9r in TL cells.
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MESH Headings
- 5' Flanking Region/genetics
- AT Rich Sequence/genetics
- Amino Acid Sequence
- Animals
- Base Sequence
- Blotting, Western
- Cell Nucleus/metabolism
- Chromatin Immunoprecipitation
- DNA, Neoplasm/genetics
- DNA, Neoplasm/metabolism
- Female
- Gene Expression Regulation, Neoplastic
- Immunohistochemistry
- Lymphoma, T-Cell/genetics
- Lymphoma, T-Cell/metabolism
- Lymphoma, T-Cell/pathology
- Male
- Mice
- Mice, Inbred C57BL
- Molecular Sequence Data
- Phosphoproteins/genetics
- Phosphoproteins/metabolism
- Promoter Regions, Genetic/genetics
- Protein Binding
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Receptors, Interleukin-9/genetics
- Reverse Transcriptase Polymerase Chain Reaction
- Tumor Cells, Cultured
- Nucleolin
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Affiliation(s)
- Yi Shang
- Experimental Radiobiology for Children's Health Research Group, Research Center for Radiation Protection, National Institute of Radiological Sciences, Inage-ku, Chiba, Japan
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Layat E, Cotterell S, Vaillant I, Yukawa Y, Tutois S, Tourmente S. Transcript levels, alternative splicing and proteolytic cleavage of TFIIIA control 5S rRNA accumulation during Arabidopsis thaliana development. THE PLANT JOURNAL : FOR CELL AND MOLECULAR BIOLOGY 2012; 71:35-44. [PMID: 22353599 DOI: 10.1111/j.1365-313x.2012.04948.x] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Ribosome biogenesis is critical for eukaryotic cells and requires coordinated synthesis of the protein and rRNA moieties of the ribosome, which are therefore highly regulated. 5S ribosomal RNA, an essential component of the large ribosomal subunit, is transcribed by RNA polymerase III and specifically requires transcription factor IIIA (TFIIIA). To obtain insight into the regulation of 5S rRNA transcription, we have investigated the expression of 5S rRNA and the exon-skipped (ES) and exon-including (EI) TFIIIA transcripts, two transcript isoforms that result from alternative splicing of the TFIIIA gene, and TFIIIA protein amounts with respect to requirements for 5S rRNA during development. We show that 5S rRNA quantities are regulated through distinct but complementary mechanisms operating through transcriptional and post-transcriptional control of TFIIIA transcripts as well as at the post-translational level through proteolytic cleavage of the TFIIIA protein. During the reproductive phase, high expression of the TFIIIA gene together with low proteolytic cleavage contributes to accumulation of functional, full-length TFIIIA protein, and results in 5S rRNA accumulation in the seed. In contrast, just after germination, the levels of TFIIIA-encoding transcripts are low and stable. Full-length TFIIIA protein is undetectable, and the level of 5S rRNA stored in the embryo progressively decreases. After day 4, in correlation with the reorganization of 5S rDNA chromatin to a mature state, full-length TFIIIA protein with transcriptional activity accumulates and permits de novo transcription of 5S rRNA.
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Affiliation(s)
- Elodie Layat
- CNRS, UMR 6293 GReD, Clermont Université, INSERM U1103, 24 Avenue des Landais, BP 80026, 63171 Aubière Cedex, France
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Abstract
Nucleolin is a multifunctional protein localized primarily in the nucleolus, but also found in the nucleoplasm, cytoplasm and cell membrane. It is involved in several aspects of DNA metabolism, and participates extensively in RNA regulatory mechanisms, including transcription, ribosome assembly, mRNA stability and translation, and microRNA processing. Nucleolin's implication in disease is linked to its ability to associate with target RNAs via its four RNA-binding domains and its arginine/glycin-rich domain. By modulating the post-transcriptional fate of target mRNAs, which typically bear AU-rich and/or G-rich elements, nucleolin has been linked to cellular events that influence disease, notably cell proliferation and protection against apoptotic death. Through its diverse RNA functions, nucleolin is increasingly implicated in pathological processes, particularly cancer and viral infection. Here, we review the RNA-binding activities of nucleolin, its influence on gene expression patterns, and its impact upon diseases. We also discuss the rising interest in targeting nucleolin therapeutically.
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Affiliation(s)
- Kotb Abdelmohsen
- Laboratory of Molecular Biology and Immunology, National Institute on Aging-Intramural Research Program, National Institutes of Health, Baltimore, MD, USA.
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