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Reviejo M, Lozano E, Marin JJG. Impact of alternative splicing on cholangiocarcinoma progression through metabolic rewiring-induced epigenetic events. J Hepatol 2024; 81:587-589. [PMID: 38810883 DOI: 10.1016/j.jhep.2024.05.030] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Revised: 05/21/2024] [Accepted: 05/22/2024] [Indexed: 05/31/2024]
Affiliation(s)
- Maria Reviejo
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Elisa Lozano
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain
| | - Jose J G Marin
- Experimental Hepatology and Drug Targeting (HEVEPHARM), University of Salamanca, IBSAL, Salamanca, Spain; Center for the Study of Liver and Gastrointestinal Diseases (CIBERehd), Carlos III National Institute of Health, Madrid, Spain.
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2
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Zhang XY, Li YY, Huang HX, Zhao CC, Lei XX, Zhao BP, Lu JY, Lan T, Sun WC. Seneca Valley virus 3C pro antagonizes host innate immune responses and programmed cell death. Front Microbiol 2023; 14:1235620. [PMID: 37869659 PMCID: PMC10588452 DOI: 10.3389/fmicb.2023.1235620] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2023] [Accepted: 09/19/2023] [Indexed: 10/24/2023] Open
Abstract
Seneca Valley virus (SVV), a member of the Picornaviridae family, may cause serious water blister diseases in pregnant sows and acute death in newborn piglets, which have resulted in economic losses in pig production. The 3C protease is a vital enzyme for SVV maturation and is capable of regulating protein cleavage and RNA replication of the virus. Additionally, this protease can impede the host's innate immune response by targeting the interferon pathway's principal factor and enhance virus replication by modulating the host's RNA metabolism while simultaneously triggering programmed cell death. This article reviews recent studies on SVV 3C functions, which include viral replication promotion, cell apoptosis modulation and host immune response evasion, and provides a theoretical basis for research on preventing and controlling SVV infection.
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Affiliation(s)
- Xin-yu Zhang
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Yu-ying Li
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Hai-xin Huang
- Institute of Virology, Wenzhou University, Wenzhou, China
- College of Veterinary Medicine, Northwest A&F University, Xianyang, China
| | - Chen-chen Zhao
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Xiao-xiao Lei
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Bao-peng Zhao
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Jing-yi Lu
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Tian Lan
- Institute of Virology, Wenzhou University, Wenzhou, China
| | - Wen-chao Sun
- Institute of Virology, Wenzhou University, Wenzhou, China
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3
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Gonzalez CE, Ben Abdeljelil N, Pearson A. The Disruption of a Nuclear Export Signal in the C-Terminus of the Herpes Simplex Virus 1 Determinant of Pathogenicity UL24 Protein Leads to a Syncytial Plaque Phenotype. Viruses 2023; 15:1971. [PMID: 37766377 PMCID: PMC10535440 DOI: 10.3390/v15091971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Revised: 09/17/2023] [Accepted: 09/19/2023] [Indexed: 09/29/2023] Open
Abstract
UL24 of herpes simplex virus 1 (HSV-1) has been shown to be a determinant of pathogenesis in mouse models of infection. The N-terminus of UL24 localizes to the nucleus and drives the redistribution of nucleolin and B23. In contrast, when expressed alone, the C-terminal domain of UL24 accumulates in the Golgi apparatus; its importance during infection is unknown. We generated a series of mammalian expression vectors encoding UL24 with nested deletions in the C-terminal domain. Interestingly, enhanced nuclear staining was observed for several UL24-deleted forms in transient transfection assays. The substitution of a threonine phosphorylation site had no effect on UL24 localization or viral titers in cell culture. In contrast, mutations targeting a predicted nuclear export signal (NES) significantly enhanced nuclear localization, indicating that UL24 is able to shuttle between the nucleus and the cytoplasm. Recombinant viruses that encode UL24-harboring substitutions in the NES led to the accumulation of UL24 in the nucleus. Treatment with the CRM-1-specific inhibitor leptomycin B blocked the nuclear export of UL24 in transfected cells but not in the context of infection. Viruses encoding UL24 with NES mutations resulted in a syncytial phenotype, but viral yield was unaffected. These results are consistent with a role for HSV-1 UL24 in late cytoplasmic events in HSV-1 replication.
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Affiliation(s)
| | | | - Angela Pearson
- Centre Armand-Frappier Santé Biotechnologie, Institut National de la Recherche Scientifique, Laval, QC H7V 1B7, Canada
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Kumar H, Gupta NV, Jain R, Madhunapantula SV, Babu S, Dey S, Soni AG, Jain V. F3 peptide functionalized liquid crystalline nanoparticles for delivering Salinomycin against breast cancer. Int J Pharm 2023; 643:123226. [PMID: 37451328 DOI: 10.1016/j.ijpharm.2023.123226] [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: 03/02/2023] [Revised: 07/10/2023] [Accepted: 07/11/2023] [Indexed: 07/18/2023]
Abstract
Salinomycin (Sal) is a potent veterinary antibiotic known to offer significant toxicity to the variety of neoplastic cells. Its therapeutic utility is limited due to its higher lipophilicity (logP 7.5) and poor hydrophilicity. Liquid crystalline nanoparticles (LCNPs) known to offer a suitable delivery platform for these kinds of drugs. The overexpressed nucleolin receptor on the cell surface and cytoplasm, could be selected as a target in cancer therapy. The present study involves the development and characterization of the F3 peptide functionalized LCNPs for delivering Sal (F3-Sal-NPs) for selectively targeting to the nucleolin receptor. The optimized LCNPs were characterized for particle size, zeta potential, surface morphology, drug release kinetics and stability. The LCNPs have a structure similar to nematic phases. In vitro drug release studies revealed sustained drug release characteristics (89.5 ± 1.5% at 120 h) with F3-Sal-NPs. The cytotoxicity results demonstrated that F3-Sal-NPs were 4.8, 2.6 and 5.5 folds more effective than naïve drug in MDA-MB-468, MDA-MB-231 and MCF-7 cells, respectively and the cell cycle was arrested in the S and G2/M phases. The expression of the gene responsible for the stemness (CD44 gene), apoptosis (BAX/Bcl-2 ration) and angiogenesis (LCN-2) was reduced by F3-Sal-NPs treatment. Ex vivo hemolytic toxicity was reduced (6.5 ± 1.5%) and the pharmacokinetics and bioavailability of Sal was improved with F3-Sal-NPs. The in vivo antitumor efficacy was tested in EAC bearing mice, where F3-Sal-NPs significantly reduced the tumor growth by 2.8-fold compared to pure Sal and induced necrosis of tumor cells. The results clearly demonstrate the outstanding performance of F3 peptide functionalized LCNPs for delivering Sal against breast cancer.
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Affiliation(s)
- Hitesh Kumar
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru-570015, India
| | - N Vishal Gupta
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru-570015, India
| | - Rupshee Jain
- Department of Pharmaceutical Chemistry, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru-570015, India
| | - SubbaRao V Madhunapantula
- Department of Biochemistry, Centre of Excellence in Molecular Biology & Regenerative Medicine, JSS Medical College, JSS Academy of Higher Education & Research, Mysuru-570015, India
| | - Saravana Babu
- Department of Pharmacology, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru-570015, India
| | - Surajit Dey
- Roseman University of Health Sciences, College of Pharmacy, Henderson, Nevada, USA
| | - Anshita Gupta Soni
- Shri Rawatpura Sarkar Institute of Pharmacy, Kumhari, Durg-491001, India
| | - Vikas Jain
- Department of Pharmaceutics, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Mysuru-570015, India.
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Tao W, Lei H, Luo W, Huang Z, Ling P, Guo M, Wan L, Zhai K, Huang Q, Wu Q, Xu S, Zeng L, Wang X, Dong Z, Rich JN, Bao S. Novel INHAT repressor drives glioblastoma growth by promoting ribosomal DNA transcription in glioma stem cells. Neuro Oncol 2023; 25:1428-1440. [PMID: 36521011 PMCID: PMC10398814 DOI: 10.1093/neuonc/noac272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023] Open
Abstract
BACKGROUND Cancer cells including cancer stem cells exhibit a higher rate of ribosome biogenesis than normal cells to support rapid cell proliferation in tumors. However, the molecular mechanisms governing the preferential ribosome biogenesis in glioma stem cells (GSCs) remain unclear. In this work, we show that the novel INHAT repressor (NIR) promotes ribosomal DNA (rDNA) transcription to support GSC proliferation and glioblastoma (GBM) growth, suggesting that NIR is a potential therapeutic target for GBM. METHODS Immunoblotting, immunohistochemical and immunofluorescent analysis were used to determine NIR expression in GSCs and human GBMs. Using shRNA-mediated knockdown, we assessed the role and functional significance of NIR in GSCs and GSC-derived orthotopic GBM xenografts. We further performed mass spectrometry analysis, chromatin immunoprecipitation, and other biochemical assays to define the molecular mechanisms by which NIR promotes GBM progression. RESULTS Our results show that high expression of NIR predicts poor survival in GBM patients. NIR is enriched in the nucleoli of GSCs in human GBMs. Disrupting NIR markedly suppresses GSC proliferation and tumor growth by inhibiting rDNA transcription and pre-ribosomal RNA synthesis. In mechanistic studies, we find that NIR activates rDNA transcription to promote GSC proliferation by cooperating with Nucleolin (NCL) and Nucleophosmin 1 (NPM1), 2 important nucleolar transcription factors. CONCLUSIONS Our study uncovers a critical role of NIR-mediated rDNA transcription in the malignant progression of GBM, indicating that targeting this axis may provide a novel therapeutic strategy for GBM.
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Affiliation(s)
- Weiwei Tao
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Hong Lei
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Wenlong Luo
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Zhi Huang
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Peng Ling
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Mengyue Guo
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Lihao Wan
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Kui Zhai
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Qian Huang
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
| | - Qiulian Wu
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Shutong Xu
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Liang Zeng
- Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei, China
| | - Xiuxing Wang
- Department of Cell Biology, School of Basic Medical Sciences, Nanjing Medical University, Nanjing, Jiangsu, China
| | - Zhiqiang Dong
- College of Biomedicine and Health and College of Life Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Jeremy N Rich
- Department of Neurology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA
| | - Shideng Bao
- Department of Cancer Biology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA
- Case Comprehensive Cancer Center, Case Western Reserve University School of Medicine, Cleveland, Ohio, USA
- Center for Cancer Stem Cell Research, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio, USA)
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Liu Y, Hu B, Pei X, Li J, Qi D, Xu Y, Ou H, Wu Y, Xue L, Huang JH, Wu E, Hu X. A Non-G-Quadruplex DNA Aptamer Targeting NCL for Diagnosis and Therapy in Bladder Cancer. Adv Healthc Mater 2023; 12:e2300791. [PMID: 37262080 DOI: 10.1002/adhm.202300791] [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: 03/26/2023] [Indexed: 06/03/2023]
Abstract
Bladder cancer (BC) is a highly aggressive malignant tumor affecting the urinary system, characterized by metastasis and a poor prognosis that often leads to limited therapeutic success. This study aims to develop a novel DNA aptamer for the diagnosis and treatment of BC using a tissue-based systematic evolution of ligands by an exponential enrichment (SELEX) process. By using SELEX, this work successfully generates a new aptamer named TB-5, which demonstrates a remarkable and specific affinity for nucleolin (NCL) in BC tissues and displays marked biocompatibility both in vitro and in vivo. Additionally, this work shows that NCL is a reliable tissue-specific biomarker in BC. Moreover, according to circular dichroism spectroscopy, TB-5 forms a non-G-quadruplex structure, distinguishing it from the current NCL-targeting aptamer AS1411, and exhibits a distinct binding region on NCL compared to AS1411. Notably, this study further reveals that TB-5 activates NCL function by promoting autophagy and suppressing the migration and invasion of BC cells, which occurs by disrupting mRNA transcription processes. These findings highlight the critical role of NCL in the pathological examination of BC and warrant more comprehensive investigations on anti-NCL aptamers in BC imaging and treatment.
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Affiliation(s)
- Yunyi Liu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Bei Hu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Xiaming Pei
- Department of Urology, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine. Changsha, Hunan, 410013, China
| | - Juan Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Dan Qi
- Department of Neurosurgery and Neuroscience Institute, Baylor Scott & White Health, Temple, TX, 76508, USA
| | - Yuxi Xu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Hailong Ou
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Yatao Wu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
| | - Lei Xue
- Department of Pathology, Hunan Cancer Hospital and The Affiliated Cancer Hospital of Xiangya School of Medicine. Changsha, Hunan, 410013, China
| | - Jason H Huang
- Department of Neurosurgery and Neuroscience Institute, Baylor Scott & White Health, Temple, TX, 76508, USA
- Department of Medical Education, Texas A&M University School of Medicine, College Station, TX, 77843, USA
| | - Erxi Wu
- Department of Neurosurgery and Neuroscience Institute, Baylor Scott & White Health, Temple, TX, 76508, USA
- Department of Medical Education, Texas A&M University School of Medicine, College Station, TX, 77843, USA
- Department of Pharmaceutical Sciences, Texas A&M University School of Pharmacy, College Station, TX, 77843, USA
- LIVESTRONG Cancer Institutes and Department of Oncology, Dell Medical School, The University of Texas at Austin, Austin, TX, 78712, USA
| | - Xiaoxiao Hu
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Biology, Molecular Science and Biomedicine Laboratory and Aptamer Engineering Center of Hunan Province, Hunan University, Changsha, Hunan, 410082, China
- Research Institute of Hunan University in Chongqing, Chongqing, 401120, China
- Shenzhen Research Institute, Hunan University, Shenzhen, Guangdong, 518000, China
- Hunan Yonghe-sun Biotechnology Co. Ltd., Changsha, Hunan, 410082, China
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Valencia-Lozano E, Herrera-Isidrón L, Flores-López JA, Recoder-Meléndez OS, Uribe-López B, Barraza A, Cabrera-Ponce JL. Exploring the Potential Role of Ribosomal Proteins to Enhance Potato Resilience in the Face of Changing Climatic Conditions. Genes (Basel) 2023; 14:1463. [PMID: 37510367 PMCID: PMC10379993 DOI: 10.3390/genes14071463] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2023] [Revised: 07/05/2023] [Accepted: 07/14/2023] [Indexed: 07/30/2023] Open
Abstract
Potatoes have emerged as a key non-grain crop for food security worldwide. However, the looming threat of climate change poses significant risks to this vital food source, particularly through the projected reduction in crop yields under warmer temperatures. To mitigate potential crises, the development of potato varieties through genome editing holds great promise. In this study, we performed a comprehensive transcriptomic analysis to investigate microtuber development and identified several differentially expressed genes, with a particular focus on ribosomal proteins-RPL11, RPL29, RPL40 and RPL17. Our results reveal, by protein-protein interaction (PPI) network analyses, performed with the highest confidence in the STRING database platform (v11.5), the critical involvement of these ribosomal proteins in microtuber development, and highlighted their interaction with PEBP family members as potential microtuber activators. The elucidation of the molecular biological mechanisms governing ribosomal proteins will help improve the resilience of potato crops in the face of today's changing climatic conditions.
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Affiliation(s)
- Eliana Valencia-Lozano
- Departamento de Ingeniería Genética, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico
| | - Lisset Herrera-Isidrón
- Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato (UPIIG), Instituto Politécnico Nacional, Av. Mineral de Valenciana 200, Puerto Interior, Silao de la Victoria 36275, Guanajuato, Mexico
| | - Jorge Abraham Flores-López
- Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato (UPIIG), Instituto Politécnico Nacional, Av. Mineral de Valenciana 200, Puerto Interior, Silao de la Victoria 36275, Guanajuato, Mexico
| | - Osiel Salvador Recoder-Meléndez
- Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato (UPIIG), Instituto Politécnico Nacional, Av. Mineral de Valenciana 200, Puerto Interior, Silao de la Victoria 36275, Guanajuato, Mexico
| | - Braulio Uribe-López
- Unidad Profesional Interdisciplinaria de Ingeniería Campus Guanajuato (UPIIG), Instituto Politécnico Nacional, Av. Mineral de Valenciana 200, Puerto Interior, Silao de la Victoria 36275, Guanajuato, Mexico
| | - Aarón Barraza
- CONACYT-Centro de Investigaciones Biológicas del Noreste, SC., Instituto Politécnico Nacional 195, Playa Palo de Santa Rita Sur, La Paz CP 23096, Baja California Sur, Mexico
| | - José Luis Cabrera-Ponce
- Departamento de Ingeniería Genética, Centro de Investigación y de Estudios Avanzados del IPN, Unidad Irapuato, Irapuato 36824, Guanajuato, Mexico
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Yin L, Tang Y, Luo Z, Yuan L, Lin X, Wang S, Liang P, Jiang B. NUCLEOLIN PROTECTS CARDIOMYOCYTES BY UPREGULATING PGC-1α AND PROMOTING MITOCHONDRIAL BIOGENESIS IN LPS-INDUCED MYOCARDIAL INJURY. Shock 2023; 59:627-636. [PMID: 36680791 DOI: 10.1097/shk.0000000000002084] [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: 01/22/2023]
Abstract
ABSTRACT Background: Lipopolysaccride-induced myocardial injury was characterized by frequent mitochondrial dysfunction. Our previous studies found that nucleolin (NCL) played important protective roles in myocardial ischemia-reperfusion injury. Recently, it has been found that NCL has a protective effect on LPS-induced myocardial injury in vivo . However, the exact underlying mechanisms that how NCL protects myocardium against the LPS-induced myocardial injury remains unclear. Objective: The aim of the study is to investigate the protective role of NCL in LPS-induced myocardial injury from the aspect of mitochondrial biogenesis. Methods: The cardiac-specific NCL-knockout (NCL -/- ) or NCL f/f mice were injected with LPS (10 mg/kg) to induce LPS-induced myocardial injury. The supernatant generated after LPS stimulation of macrophages was used as the conditioned medium to stimulate H9C2 and established the injured cell model. Analysis of mRNA stability, RNA-binding protein immunoprecipitation assay, and luciferase reporter assay were performed to detect the mechanism by which NCL regulated the expression of PGC-1α. Results: The expression of NCL and PGC-1α was elevated in cardiac tissue and cardiomyocytes during LPS-induced myocardial injury. The cardiac-specific NCL-knockout decreased PGC-1α expression, inhibited mitochondrial biogenesis, and increased cardiomyocytes death during LPS-induced myocardial injury in vitro and in vivo . In contrast, the overexpression of NCL could improve mitochondrial biogenesis in H9C2 cells. Moreover, the analysis of mRNA stability and luciferase reporter assay revealed that the interaction between NCL and PGC-1α significantly promoted the stability of PGC-1α mRNA, thereby upregulating the expression of PGC-1α and exerting a cardioprotective effect. In addition, the activation of PGC-1α diminished the detrimental effects of NCL knockdown on mitochondrial biogenesis in vitro and in vivo . Conclusions: Nucleolin upregulated the gene expression of PGC-1α by directly binding to the 5'-UTR of PGC-1α mRNA and increasing its mRNA stabilities, then promoted mitochondrial biogenesis, and played protective effect on cardiomyocytes during LPS-induced myocardial injury. Taken together, all these data showed that NCL activated PGC-1α to rescue cardiomyocytes from LPS-induced myocardial injury insult, suggesting that the cardioprotective role of NCL might be a promising prospect for clinical treatment of patients with endotoxemia.
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Affiliation(s)
| | | | | | | | | | | | - Pengfei Liang
- Department of Burns and Plastic Surgery, Xiangya Hospital, Central South University, Changsha, P.R. China
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9
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Hong J, Jia S, Wang C, Li Y, He F, Gardea-Torresdey JL. Transcriptome reveals the exposure effects of CeO 2 nanoparticles on pakchoi (Brassica chinensis L.) photosynthesis. JOURNAL OF HAZARDOUS MATERIALS 2023; 444:130427. [PMID: 36410248 DOI: 10.1016/j.jhazmat.2022.130427] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/02/2022] [Revised: 11/06/2022] [Accepted: 11/16/2022] [Indexed: 06/16/2023]
Abstract
In this study, soil-grown pakchoi after 2 weeks seedling cultivation were exposed to CeO2 nanoparticles (CeO2 NPs) at 0.7, 7, 70, and 350 mg kg-1 for 30 days. Results showed that chlorophyll content and photosynthetic assimilation rate were decreased significantly under all treatments with the largest decrease of 34.16% (0.7 mg kg-1 CeO2 NPs), however, sub-stomatal CO2 was increased dramatically under low dose of CeO2 NPs (0.7 mg kg-1). There were 4576, 3548, 2787, and 2514 genes up/down regulated significantly by 0.7, 7, 70, and 350 mg kg-1 CeO2 NPs, respectively, and 767 genes affected under all treatments. In addition, 0.7 mg kg-1 CeO2 NPs up-regulated 10 chlorophyll synthesis genes, 20 photosynthesis genes, and 10 carbon fixation enzyme genes; while 350 mg kg-1 CeO2 NPs down-regulated 5 photosynthesis genes and 28 auxin-activated genes. Among the key genes of photosynthesis, Ferredoxin-NADP reductase (PetH) was upregulated in 0.7, 7 and 70 mg kg-1 treatments, while Photosystem II lipoprotein (Psb27) was downregulated under 7, 70 and 350 mg kg-1 treatments. Top 20 metabolic pathways affected by CeO2 NPs including plant hormone, amino acids, and glutathione, and carbon metabolism These results provide information about utilizing CeO2 NPs more safely and effectively in the future.
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Affiliation(s)
- Jie Hong
- College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China.
| | - Siying Jia
- College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Chao Wang
- College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Yi Li
- College of Life Sciences, Shanxi Agricultural University, Taigu, Shanxi 030801, China
| | - Feng He
- College of Environment, Zhejiang University of Technology, Hangzhou, Zhejiang 310014, China
| | - Jorge L Gardea-Torresdey
- Department of Chemistry and Biochemistry, The University of Texas, El Paso, TX 79968, United States
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10
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Cattaneo M, Beltrami AP, Thomas AC, Spinetti G, Alvino V, Avolio E, Veneziano C, Rolle IG, Sponga S, Sangalli E, Maciag A, Dal Piaz F, Vecchione C, Alenezi A, Paisey S, Puca AA, Madeddu P. The longevity-associated BPIFB4 gene supports cardiac function and vascularization in aging cardiomyopathy. Cardiovasc Res 2023:6986428. [PMID: 36635236 DOI: 10.1093/cvr/cvad008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/16/2022] [Revised: 10/24/2022] [Accepted: 01/11/2023] [Indexed: 01/14/2023] Open
Abstract
AIMS The aging heart naturally incurs a progressive decline in function and perfusion that available treatments cannot halt. However, some exceptional individuals maintain good health until the very late stage of their life due to favourable gene-environment interaction. We have previously shown that carriers of a longevity-associated variant (LAV) of the BPIFB4 gene enjoy prolonged health spans and lesser cardiovascular complications. Moreover, supplementation of LAV-BPIFB4 via an adeno-associated viral vector improves cardiovascular performance in limb ischemia, atherosclerosis, and diabetes models. Here, we asked if the LAV-BPIFB4 gene could address the unmet therapeutic need to delay the heart's spontaneous aging. METHODS AND RESULTS Immunohistological studies showed a remarkable reduction in vessel coverage by pericytes in failing hearts explanted from elderly patients. This defect was attenuated in patients carrying the homozygous LAV-BPIFB4 genotype. Moreover, pericytes isolated from older hearts showed low levels of BPIFB4, depressed pro-angiogenic activity, and loss of ribosome biogenesis. LAV-BPIFB4 supplementation restored pericyte function and pericyte-endothelial cell interactions through a mechanism involving the nucleolar protein nucleolin. Conversely, BPIFB4 silencing in normal pericytes mimed the heart failure pericytes. Finally, gene therapy with LAV-BPIFB4 prevented cardiac deterioration in middle-aged mice and rescued cardiac function and myocardial perfusion in older mice by improving microvasculature density and pericyte coverage. CONCLUSIONS We report the success of the LAV-BPIFB4 gene/protein in improving homeostatic processes in the heart's aging. These findings open to using LAV-BPIFB4 to reverse the decline of heart performance in older people.
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Affiliation(s)
| | - Antonio P Beltrami
- Department of Medicine, University of Udine, Academic Hospital of Udine, ASUFC, Udine, Italy
| | - Anita C Thomas
- Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Gaia Spinetti
- Cardiovascular Department, IRCCS Multimedica, Milan, Italy
| | - Valeria Alvino
- Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Elisa Avolio
- Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
| | - Claudia Veneziano
- Department of Medicine, University of Udine, Academic Hospital of Udine, ASUFC, Udine, Italy
| | - Irene Giulia Rolle
- Department of Medicine, University of Udine, Academic Hospital of Udine, ASUFC, Udine, Italy
| | - Sandro Sponga
- Department of Medicine, University of Udine, Academic Hospital of Udine, ASUFC, Udine, Italy
| | - Elena Sangalli
- Cardiovascular Department, IRCCS Multimedica, Milan, Italy
| | - Anna Maciag
- Cardiovascular Department, IRCCS Multimedica, Milan, Italy
| | - Fabrizio Dal Piaz
- Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy
| | - Carmine Vecchione
- Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy.,Department of Vascular Physiopathology, IRCCS Neuromed, Pozzilli, Italy
| | - Aishah Alenezi
- Wales Research & Diagnostic Positron Emission Tomography Imaging Centre, Cardiff University, UK
| | - Stephen Paisey
- Wales Research & Diagnostic Positron Emission Tomography Imaging Centre, Cardiff University, UK
| | - Annibale A Puca
- Cardiovascular Department, IRCCS Multimedica, Milan, Italy.,Department of Medicine, Surgery and Dentistry, University of Salerno, Salerno, Italy
| | - Paolo Madeddu
- Translational Health Sciences, Bristol Medical School, University of Bristol, Bristol, UK
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11
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James SW, Palmer J, Keller NP, Brown ML, Dunworth MR, Francisco SG, Watson KG, Titchen B, Achimovich A, Mahoney A, Artemiou JP, Buettner KG, Class M, Sydenstricker AL, Anglin SL. A reciprocal translocation involving Aspergillus nidulans snxAHrb1/Gbp2 and gyfA uncovers a new regulator of the G2-M transition and reveals a role in transcriptional repression for the setBSet2 histone H3-lysine-36 methyltransferase. Genetics 2022; 222:iyac130. [PMID: 36005881 PMCID: PMC9526064 DOI: 10.1093/genetics/iyac130] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 08/09/2022] [Indexed: 12/24/2022] Open
Abstract
Aspergillus nidulans snxA, an ortholog of Saccharomyces cerevisiae Hrb1/Gbp2 messenger RNA shuttle proteins, is-in contrast to budding yeast-involved in cell cycle regulation, in which snxA1 and snxA2 mutations as well as a snxA deletion specifically suppress the heat sensitivity of mutations in regulators of the CDK1 mitotic induction pathway. snxA mutations are strongly cold sensitive, and at permissive temperature snxA mRNA and protein expression are strongly repressed. Initial attempts to identify the causative snxA mutations revealed no defects in the SNXA protein. Here, we show that snxA1/A2 mutations resulted from an identical chromosome I-II reciprocal translocation with breakpoints in the snxA first intron and the fourth exon of a GYF-domain gene, gyfA. Surprisingly, a gyfA deletion and a reconstructed gyfA translocation allele suppressed the heat sensitivity of CDK1 pathway mutants in a snxA+ background, demonstrating that 2 unrelated genes, snxA and gyfA, act through the CDK1-CyclinB axis to restrain the G2-M transition, and for the first time identifying a role in G2-M regulation for a GYF-domain protein. To better understand snxA1/A2-reduced expression, we generated suppressors of snxA cold sensitivity in 2 genes: (1) loss of the abundant nucleolar protein Nsr1/nucleolin bypassed the requirement for snxA and (2) loss of the Set2 histone H3 lysine36 (H3K36) methyltransferase or a nonmethylatable histone H3K36L mutant rescued hypomorphic snxA mutants by restoring full transcriptional proficiency, indicating that methylation of H3K36 acts normally to repress snxA transcription. These observations are in line with known Set2 functions in preventing excessive and cryptic transcription of active genes.
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Affiliation(s)
- Steven W James
- Department of Biology, Gettysburg College, Gettysburg, PA 17325, USA
| | - Jonathan Palmer
- Data Analytics, Genencor Technology Center, IFF, Palo Alto, CA, 94306, USA
| | - Nancy P Keller
- Department of Medical Microbiology and Immunology, University of Wisconsin—Madison, Madison, WI 53726, USA
| | - Morgan L Brown
- Department of Cell and Developmental Biology, University of Pennsylvania, Philadelphia, PA 19104, USA
| | - Matthew R Dunworth
- Department of Cell Biology, Johns Hopkins School of Medicine, Baltimore, MD 21218, USA
| | - Sarah G Francisco
- Department of Otolaryngology, Boston Children’s Hospital, Boston, MA 02115, USA
| | - Katherine G Watson
- School of Medicine, Noorda College of Osteopathic Medicine, Provo, UT 84606, USA
| | - Breanna Titchen
- Department of Biological and Biomedical Sciences, Harvard University, Cambridge, MA 02138, USA
| | - Alecia Achimovich
- Department of Chemistry, Gettysburg College, Gettysburg, PA 17325, USA
| | - Andrew Mahoney
- Department of Chemistry, Emory University, Atlanta, GA 30322, USA
| | | | - Kyra G Buettner
- School of Medicine, Thomas Jefferson University, Philadelphia, PA 19144, USA
| | - Madelyn Class
- School of Medicine, Temple University, Philadelphia, PA 19140, USA
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12
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Ercc2/Xpd deficiency results in failure of digestive organ growth in zebrafish with elevated nucleolar stress. iScience 2022; 25:104957. [PMID: 36065184 PMCID: PMC9440294 DOI: 10.1016/j.isci.2022.104957] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 05/23/2022] [Accepted: 08/12/2022] [Indexed: 12/09/2022] Open
Abstract
Mutations in ERCC2/XPD helicase, an important component of the TFIIH complex, cause distinct human genetic disorders which exhibit various pathological features. However, the molecular mechanisms underlying many symptoms remain elusive. Here, we have shown that Ercc2/Xpd deficiency in zebrafish resulted in hypoplastic digestive organs with normal bud initiation but later failed to grow. The proliferation of intestinal endothelial cells was impaired in ercc2/xpd mutants, and mitochondrial abnormalities, autophagy, and inflammation were highly induced. Further studies revealed that these abnormalities were associated with the perturbation of rRNA synthesis and nucleolar stress in a p53-independent manner. As TFIIH has only been implicated in RNA polymerase I-dependent transcription in vitro, our results provide the first evidence for the connection between Ercc2/Xpd and rRNA synthesis in an animal model that recapitulates certain key characteristics of ERCC2/XPD-related human genetic disorders, and will greatly advance our understanding of the molecular pathogenesis of these diseases. Ercc2/Xpd deficiency results in failure of digestive organ growth in zebrafish Ercc2/Xpd-deficient intestinal endothelial cells exhibit impaired proliferation Mitochondrial abnormalities, autophagy, and inflammation are highly induced rRNA synthesis perturbation leads to nucleolar stress in a p53-independent manner
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13
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Ribosome-Directed Therapies in Cancer. Biomedicines 2022; 10:biomedicines10092088. [PMID: 36140189 PMCID: PMC9495564 DOI: 10.3390/biomedicines10092088] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/22/2022] [Accepted: 08/22/2022] [Indexed: 12/29/2022] Open
Abstract
The human ribosomes are the cellular machines that participate in protein synthesis, which is deeply affected during cancer transformation by different oncoproteins and is shown to provide cancer cell proliferation and therefore biomass. Cancer diseases are associated with an increase in ribosome biogenesis and mutation of ribosomal proteins. The ribosome represents an attractive anti-cancer therapy target and several strategies are used to identify specific drugs. Here we review the role of different drugs that may decrease ribosome biogenesis and cancer cell proliferation.
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14
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Muñoz-Díaz E, Sáez-Vásquez J. Nuclear dynamics: Formation of bodies and trafficking in plant nuclei. FRONTIERS IN PLANT SCIENCE 2022; 13:984163. [PMID: 36082296 PMCID: PMC9445803 DOI: 10.3389/fpls.2022.984163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/01/2022] [Accepted: 08/04/2022] [Indexed: 06/01/2023]
Abstract
The existence of the nucleus distinguishes prokaryotes and eukaryotes. Apart from containing most of the genetic material, the nucleus possesses several nuclear bodies composed of protein and RNA molecules. The nucleus is separated from the cytoplasm by a double membrane, regulating the trafficking of molecules in- and outwards. Here, we investigate the composition and function of the different plant nuclear bodies and molecular clues involved in nuclear trafficking. The behavior of the nucleolus, Cajal bodies, dicing bodies, nuclear speckles, cyclophilin-containing bodies, photobodies and DNA damage foci is analyzed in response to different abiotic stresses. Furthermore, we research the literature to collect the different protein localization signals that rule nucleocytoplasmic trafficking. These signals include the different types of nuclear localization signals (NLSs) for nuclear import, and the nuclear export signals (NESs) for nuclear export. In contrast to these unidirectional-movement signals, the existence of nucleocytoplasmic shuttling signals (NSSs) allows bidirectional movement through the nuclear envelope. Likewise, nucleolar signals are also described, which mainly include the nucleolar localization signals (NoLSs) controlling nucleolar import. In contrast, few examples of nucleolar export signals, called nucleoplasmic localization signals (NpLSs) or nucleolar export signals (NoESs), have been reported. The existence of consensus sequences for these localization signals led to the generation of prediction tools, allowing the detection of these signals from an amino acid sequence. Additionally, the effect of high temperatures as well as different post-translational modifications in nuclear and nucleolar import and export is discussed.
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Affiliation(s)
- Eduardo Muñoz-Díaz
- Centre National de la Recherche Scientifique (CNRS), Laboratoire Génome et Développement des Plantes, UMR 5096, Perpignan, France
- Univ. Perpignan Via Domitia, Laboratoire Génome et Développement des Plantes, UMR 5096, Perpignan, France
| | - Julio Sáez-Vásquez
- Centre National de la Recherche Scientifique (CNRS), Laboratoire Génome et Développement des Plantes, UMR 5096, Perpignan, France
- Univ. Perpignan Via Domitia, Laboratoire Génome et Développement des Plantes, UMR 5096, Perpignan, France
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15
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Song J, Quan R, Wang D, Liu J. Seneca Valley Virus 3C pro Mediates Cleavage and Redistribution of Nucleolin To Facilitate Viral Replication. Microbiol Spectr 2022; 10:e0030422. [PMID: 35357201 PMCID: PMC9045095 DOI: 10.1128/spectrum.00304-22] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 03/04/2022] [Indexed: 11/21/2022] Open
Abstract
Seneca Valley virus (SVV) is a recently discovered pathogen that poses a significant threat to the global pig industry. It has been shown that many viruses are reliant on nucleocytoplasmic trafficking of nucleolin (NCL) for their own replication. Here, we demonstrate that NCL, a critical protein component of the nucleolus, is cleaved and translocated out of the nucleoli following SVV infection. Furthermore, our data suggest that SVV 3C protease (3Cpro) is responsible for this cleavage and subsequent delocalization from the nucleoli, and that inactivation of this protease activity abolished this cleavage and translocation. SVV 3Cpro cleaved NCL at residue Q545, and the cleavage fragment (aa 1 to 545) facilitated viral replication, which was similar to the activities described for full-length NCL. Small interfering RNA-mediated knockdown indicated that NCL is required for efficient viral replication and viral protein expression. In contrast, lentivirus-mediated overexpression of NCL significantly enhanced viral replication. Taken together, these results indicate that SVV 3Cpro targets NCL for its cleavage and redistribution, which contributes to efficient viral replication, thereby emphasizing the potential target of antiviral strategies for the control of SVV infection. IMPORTANCE The nucleolus is a subnuclear cellular compartment, and nucleolin (NCL) resides predominantly in the nucleolus. NCL participates in viral replication, translation, internalization, and also serves as a receptor for virus entry. The interaction between NCL and SVV is still unknown. Here, we demonstrate that SVV 3Cpro targets NCL for its cleavage and nucleocytoplasmic transportation, which contributes to efficient viral replication. Our results reveal novel function of SVV 3Cpro and provide further insight into the mechanisms by which SVV utilizes nucleoli for efficient replication.
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Affiliation(s)
- Jiangwei Song
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Rong Quan
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Dan Wang
- Beijing Key Laboratory for Prevention and Control of Infectious Diseases in Livestock and Poultry, Institute of Animal Husbandry and Veterinary Medicine, Beijing Academy of Agriculture and Forestry Sciences, Beijing, China
| | - Jue Liu
- College of Veterinary Medicine, Yangzhou University, Yangzhou, Jiangsu Province, China
- Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou University, Yangzhou, Jiangsu Province, China
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16
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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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17
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Gabanella F, Barbato C, Fiore M, Petrella C, de Vincentiis M, Greco A, Minni A, Corbi N, Passananti C, Di Certo MG. Fine-Tuning of mTOR mRNA and Nucleolin Complexes by SMN. Cells 2021; 10:3015. [PMID: 34831238 PMCID: PMC8616268 DOI: 10.3390/cells10113015] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 10/28/2021] [Accepted: 11/02/2021] [Indexed: 11/17/2022] Open
Abstract
Increasing evidence points to the Survival Motor Neuron (SMN) protein as a key determinant of translation pathway. Besides its role in RNA processing and sorting, several works support a critical implication of SMN in ribosome biogenesis. We previously showed that SMN binds ribosomal proteins (RPs) as well as their encoding transcripts, ensuring an appropriate level of locally synthesized RPs. SMN impacts the translation machinery in both neural and non-neural cells, in agreement with the concept that SMN is an essential protein in all cell types. Here, we further assessed the relationship between SMN and translation-related factors in immortalized human fibroblasts. We focused on SMN-nucleolin interaction, keeping in mind that nucleolin is an RNA-binding protein, highly abundant within the nucleolus, that exhibits a central role in ribosomes production. Nucleolin may also affects translation network by binding the mammalian target of rapamycin (mTOR) mRNA and promoting its local synthesis. In this regard, for the first time we provided evidence that SMN protein itself associates with mTOR transcript. Collectively, we found that: (1) SMN coexists with nucleolin-mTOR mRNA complexes at subcellular level; (2) SMN deficiency impairs nucleolar compartmentalization of nucleolin, and (3) this event correlates with the nuclear retention of mTOR mRNA. These findings suggest that SMN may regulate not only structural components of translation machinery, but also their upstream regulating factors.
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Affiliation(s)
- Francesca Gabanella
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (C.B.); (M.F.); (C.P.)
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Viale Regina Elena, 291-00161 Rome, Italy; (N.C.); (C.P.)
| | - Christian Barbato
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (C.B.); (M.F.); (C.P.)
| | - Marco Fiore
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (C.B.); (M.F.); (C.P.)
| | - Carla Petrella
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (C.B.); (M.F.); (C.P.)
| | - Marco de Vincentiis
- Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (M.d.V.); (A.G.); (A.M.)
| | - Antonio Greco
- Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (M.d.V.); (A.G.); (A.M.)
| | - Antonio Minni
- Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (M.d.V.); (A.G.); (A.M.)
| | - Nicoletta Corbi
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Viale Regina Elena, 291-00161 Rome, Italy; (N.C.); (C.P.)
| | - Claudio Passananti
- CNR-Institute of Molecular Biology and Pathology, Department of Molecular Medicine, Sapienza University of Rome, Viale Regina Elena, 291-00161 Rome, Italy; (N.C.); (C.P.)
| | - Maria Grazia Di Certo
- CNR-Institute of Biochemistry and Cell Biology, Department of Sense Organs, Sapienza University of Rome, Viale del Policlinico, 155-00161 Rome, Italy; (C.B.); (M.F.); (C.P.)
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18
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Manzano A, Pereda-Loth V, de Bures A, Sáez-Vásquez J, Herranz R, Medina FJ. Light signals counteract alterations caused by simulated microgravity in proliferating plant cells. AMERICAN JOURNAL OF BOTANY 2021; 108:1775-1792. [PMID: 34524692 DOI: 10.1002/ajb2.1728] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2020] [Revised: 04/18/2021] [Accepted: 04/20/2021] [Indexed: 06/13/2023]
Abstract
PREMISE Light and gravity are fundamental cues for plant development. Our understanding of the effects of light stimuli on plants in space, without gravity, is key to providing conditions for plants to acclimate to the environment. Here we tested the hypothesis that the alterations caused by the absence of gravity in root meristematic cells can be counteracted by light. METHODS Seedlings of wild-type Arabidopsis thaliana and two mutants of the essential nucleolar protein nucleolin (nuc1, nuc2) were grown in simulated microgravity, either under a white light photoperiod or under continuous darkness. Key variables of cell proliferation (cell cycle regulation), cell growth (ribosome biogenesis), and auxin transport were measured in the root meristem using in situ cellular markers and transcriptomic methods and compared with those of a 1 g control. RESULTS The incorporation of a photoperiod regime was sufficient to attenuate or suppress the effects caused by gravitational stress at the cellular level in the root meristem. In all cases, values for variables recorded from samples receiving light stimuli in simulated microgravity were closer to values from the controls than values from samples grown in darkness. Differential sensitivities were obtained for the two nucleolin mutants. CONCLUSIONS Light signals may totally or partially replace gravity signals, significantly improving plant growth and development in microgravity. Despite that, molecular alterations are still compatible with the expected acclimation mechanisms, which need to be better understood. The differential sensitivity of nuc1 and nuc2 mutants to gravitational stress points to new strategies to produce more resilient plants to travel with humans in new extraterrestrial endeavors.
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Affiliation(s)
- Aránzazu Manzano
- Centro de Investigaciones Biológicas Margarita Salas - CSIC, Ramiro de Maeztu 9, Madrid, 28040, Spain
| | | | - Anne de Bures
- CNRS, Laboratoire Génome et Développement des Plantes (LGDP), UMR 5096, Perpignan, 66860, France
- Université de Perpignan Via Domitia, LGDP, UMR 5096, Perpignan, 66860, France
| | - Julio Sáez-Vásquez
- CNRS, Laboratoire Génome et Développement des Plantes (LGDP), UMR 5096, Perpignan, 66860, France
- Université de Perpignan Via Domitia, LGDP, UMR 5096, Perpignan, 66860, France
| | - Raúl Herranz
- Centro de Investigaciones Biológicas Margarita Salas - CSIC, Ramiro de Maeztu 9, Madrid, 28040, Spain
| | - F Javier Medina
- Centro de Investigaciones Biológicas Margarita Salas - CSIC, Ramiro de Maeztu 9, Madrid, 28040, Spain
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19
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Antagonising Chromatin Remodelling Activities in the Regulation of Mammalian Ribosomal Transcription. Genes (Basel) 2021; 12:genes12070961. [PMID: 34202617 PMCID: PMC8303148 DOI: 10.3390/genes12070961] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 06/16/2021] [Accepted: 06/19/2021] [Indexed: 12/29/2022] Open
Abstract
Ribosomal transcription constitutes the major energy consuming process in cells and is regulated in response to proliferation, differentiation and metabolic conditions by several signalling pathways. These act on the transcription machinery but also on chromatin factors and ncRNA. The many ribosomal gene repeats are organised in a number of different chromatin states; active, poised, pseudosilent and repressed gene repeats. Some of these chromatin states are unique to the 47rRNA gene repeat and do not occur at other locations in the genome, such as the active state organised with the HMG protein UBF whereas other chromatin state are nucleosomal, harbouring both active and inactive histone marks. The number of repeats in a certain state varies on developmental stage and cell type; embryonic cells have more rRNA gene repeats organised in an open chromatin state, which is replaced by heterochromatin during differentiation, establishing different states depending on cell type. The 47S rRNA gene transcription is regulated in different ways depending on stimulus and chromatin state of individual gene repeats. This review will discuss the present knowledge about factors involved, such as chromatin remodelling factors NuRD, NoRC, CSB, B-WICH, histone modifying enzymes and histone chaperones, in altering gene expression and switching chromatin states in proliferation, differentiation, metabolic changes and stress responses.
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20
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Gao Y, Chen Y, Wang L, Li C, Ge W. Serum-derived extracellular vesicles inhibit osteoclastogenesis in active-phase patients with SAPHO syndrome. Ther Adv Musculoskelet Dis 2021; 13:1759720X211006966. [PMID: 33948126 PMCID: PMC8053764 DOI: 10.1177/1759720x211006966] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 03/10/2021] [Indexed: 12/02/2022] Open
Abstract
Objective: Synovitis, acne, pustulosis, hyperostosis, and osteitis (SAPHO) syndrome is a rare chronic inflammatory disorder and the underlying pathogenesis is unclear. In this study, 88 SAPHO patients and 118 healthy controls were recruited to investigate the role of serum-derived extracellular vesicles (SEVs) in SAPHO syndrome. Methods: Quantitative proteomics was applied for SEVs proteome identification, and ELISA and Western blotting was performed to verify the results of mass spectrum data. In vitro osteoclastogenesis and osteogenesis assay was used to confirm the effects of SEVs on bone metabolism. Results: Tandem mass tagging-based quantitative proteomic analysis of SAPHO SEVs revealed differential expressed proteins involved in bone metabolism. Of these, serum amyloid A-1 (SAA1) and C-reactive protein (CRP) were upregulated. Higher SAA1 levels in SAPHO patients were confirmed by ELISA. In addition, SAA1 levels were positively correlated with CRP, an inflammatory marker related to the condition of patients. In vitro celluler studies confirmed that SAPHO SEVs inhibited osteoclastogenesis in patients mainly in the active phase of the disease. Further analysis demonstrated that Nucleolin was upregulated in osteoclasts of active-phase patients under SAPHO SEVs stimulation. Conclusion: In this study, we identified SAA1 as an additional inflammation marker that can potentially assist the diagnosis of SAPHO syndrome, and speculated that Nucleolin is a key regulator of osteoclastogenesis in active-phase patients.
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Affiliation(s)
- Yanpan Gao
- State Key Laboratory of Medical Molecular Biology & Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Yanyu Chen
- State Key Laboratory of Medical Molecular Biology & Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, Beijing, China
| | - Lun Wang
- Institute of Clinical Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Chen Li
- Department of Traditional Chinese Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, No. 9 Dong Dan San Tiao, Beijing 100730, China
| | - Wei Ge
- State Key Laboratory of Medical Molecular Biology & Department of Immunology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences, No. 5 Dong Dan San Tiao, Beijing, 100005, China
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21
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Yin J, Chen S, Song Y, Wang H. Fluorescent imaging of cytoplasmic nucleolin in live cells by a functionalized-engineered aptamer. Chem Commun (Camb) 2020; 56:14171-14174. [PMID: 33156312 DOI: 10.1039/d0cc06347a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Monitoring of over-expressed nucleolin in the cytoplasm facilitates early cancer diagnosis. Herein, we present a novel biosensing nanoscaffold based on anti-nucleolin aptamers and polymer-grafted graphene oxides for the fluorescent imaging of nucleolin in the cell cytoplasm, which can distinguish cancer cells from normal cells.
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Affiliation(s)
- Junfa Yin
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, P. R. China.
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22
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Manzano A, Villacampa A, Sáez-Vásquez J, Kiss JZ, Medina FJ, Herranz R. The Importance of Earth Reference Controls in Spaceflight -Omics Research: Characterization of Nucleolin Mutants from the Seedling Growth Experiments. iScience 2020; 23:101686. [PMID: 33163940 PMCID: PMC7607443 DOI: 10.1016/j.isci.2020.101686] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/04/2020] [Accepted: 10/10/2020] [Indexed: 01/23/2023] Open
Abstract
Understanding plant adaptive responses to the space environment is a requisite for enabling space farming. Spaceflight produces deleterious effects on plant cells, particularly affecting ribosome biogenesis, a complex stress-sensitive process coordinated with cell division and differentiation, known to be activated by red light. Here, in a series of ground studies, we have used mutants from the two Arabidopsis nucleolin genes (NUC1 and NUC2, nucleolar regulators of ribosome biogenesis) to better understand their role in adaptive response mechanisms to stress on Earth. Thus, we show that nucleolin stress-related gene NUC2 can compensate for the environmental stress provided by darkness in nuc1 plants, whereas nuc2 plants are not able to provide a complete response to red light. These ground control findings, as part of the ESA/NASA Seedling Growth spaceflight experiments, will determine the basis for the identification of genetic backgrounds enabling an adaptive advantage for plants in future space experiments.
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Affiliation(s)
- Aránzazu Manzano
- Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Alicia Villacampa
- Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Julio Sáez-Vásquez
- CNRS, Laboratoire Génome et Développement des Plantes (LGDP), UMR 5096, 66860 Perpignan, France
- Univ. Perpignan Via Domitia, LGDP, UMR 5096, 66860 Perpignan, France
| | - John Z. Kiss
- Department of Biology, University of North Carolina-Greensboro, Greensboro, NC 27402, USA
| | - F. Javier Medina
- Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
| | - Raúl Herranz
- Centro de Investigaciones Biológicas Margarita Salas (CSIC), Ramiro de Maeztu 9, 28040, Madrid, Spain
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23
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Iwakawa H, Takahashi H, Machida Y, Machida C. Roles of ASYMMETRIC LEAVES2 (AS2) and Nucleolar Proteins in the Adaxial-Abaxial Polarity Specification at the Perinucleolar Region in Arabidopsis. Int J Mol Sci 2020; 21:E7314. [PMID: 33022996 PMCID: PMC7582388 DOI: 10.3390/ijms21197314] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Revised: 09/27/2020] [Accepted: 09/29/2020] [Indexed: 12/14/2022] Open
Abstract
Leaves of Arabidopsis develop from a shoot apical meristem grow along three (proximal-distal, adaxial-abaxial, and medial-lateral) axes and form a flat symmetric architecture. ASYMMETRIC LEAVES2 (AS2), a key regulator for leaf adaxial-abaxial partitioning, encodes a plant-specific nuclear protein and directly represses the abaxial-determining gene ETTIN/AUXIN RESPONSE FACTOR3 (ETT/ARF3). How AS2 could act as a critical regulator, however, has yet to be demonstrated, although it might play an epigenetic role. Here, we summarize the current understandings of the genetic, molecular, and cellular functions of AS2. A characteristic genetic feature of AS2 is the presence of a number of (about 60) modifier genes, mutations of which enhance the leaf abnormalities of as2. Although genes for proteins that are involved in diverse cellular processes are known as modifiers, it has recently become clear that many modifier proteins, such as NUCLEOLIN1 (NUC1) and RNA HELICASE10 (RH10), are localized in the nucleolus. Some modifiers including ribosomal proteins are also members of the small subunit processome (SSUP). In addition, AS2 forms perinucleolar bodies partially colocalizing with chromocenters that include the condensed inactive 45S ribosomal RNA genes. AS2 participates in maintaining CpG methylation in specific exons of ETT/ARF3. NUC1 and RH10 genes are also involved in maintaining the CpG methylation levels and repressing ETT/ARF3 transcript levels. AS2 and nucleolus-localizing modifiers might cooperatively repress ETT/ARF3 to develop symmetric flat leaves. These results raise the possibility of a nucleolus-related epigenetic repression system operating for developmental genes unique to plants and predict that AS2 could be a molecule with novel functions that cannot be explained by the conventional concept of transcription factors.
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Affiliation(s)
- Hidekazu Iwakawa
- Graduate School of Bioscience and Biotechnology, Chubu University, 1200, Matsumoto-cho, Kasugai, Aichi 487-8501, Japan;
| | - Hiro Takahashi
- Graduate School of Medical Sciences, Kanazawa University, Kakuma-machi, Kanazawa, Ishikawa 920-1192, Japan;
| | - Yasunori Machida
- Division of Biological Science, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8602, Japan
| | - Chiyoko Machida
- Graduate School of Bioscience and Biotechnology, Chubu University, 1200, Matsumoto-cho, Kasugai, Aichi 487-8501, Japan;
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24
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Wang J, Liu J, Ye M, Liu F, Wu S, Huang J, Shi G. Ddx56 maintains proliferation of mouse embryonic stem cells via ribosome assembly and interaction with the Oct4/Sox2 complex. Stem Cell Res Ther 2020; 11:314. [PMID: 32703285 PMCID: PMC7376950 DOI: 10.1186/s13287-020-01800-w] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 06/07/2020] [Accepted: 07/01/2020] [Indexed: 12/17/2022] Open
Abstract
Background Embryonic stem cells (ESCs) are important source of clinical stem cells for therapy, so dissecting the functional gene regulatory network involved in their self-renewal and proliferation is an urgent task. We previously reported that Ddx56 interacts with the core transcriptional factor Oct4 by mass spectrometry analysis in ESCs. However, the exact function of Ddx56 in ESCs remains unclear. Methods We investigated the role of Ddx56 in mouse ESCs (mESCs) through both gain- and loss-of-function strategies. The effect of Ddx56 on mESCs was determined based on morphological changes, involvement in the network of pluripotency markers (Nanog, Oct4, Sox2), and altered lineage marker expression. In addition, the role of Ddx56 in mESCs was evaluated by polysome fractionation, qRT-PCR, and co-immunoprecipitation (co-IP). Finally, RNA sequencing was applied to explore potential network regulation by Ddx56 in mESCs. Result We found that Ddx56 participated in ribosome assembly, as knockout or RNAi knockdown of Ddx56 led to ribosome dysfunction and cell lethality. Surprisingly, exogenous expression of C-terminal domain truncated Ddx56 (Ddx56 ΔC-ter) did not affect ribosome assembly, but decreased mESC proliferation by downregulation of proliferation-related genes and cell cycle changing. In terms of mechanism, Ddx56 interacted with the Oct4 and Sox2 complex by binding to Sox2, whereas Ddx56 ΔC-ter showed weaker interaction with Sox2 and led to retardation of mESC proliferation. Conclusions Ddx56 maintains ESC proliferation by conventional regulation of ribosome assembly and interaction with the Oct4 and Sox2 complex.
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Affiliation(s)
- Jingwen Wang
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Jiahui Liu
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Miaoman Ye
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Feng Liu
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Su Wu
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Junjiu Huang
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.,Key Laboratory of Reproductive Medicine of Guangdong Province, The First Affiliated Hospital and School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China
| | - Guang Shi
- MOE Key Laboratory of Gene Function and Regulation, State Key Laboratory of Biocontrol, School of Life Sciences, Sun Yat-sen University, Guangzhou, 510275, China.
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25
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Maio F, Helderman TA, Arroyo-Mateos M, van der Wolf M, Boeren S, Prins M, van den Burg HA. Identification of Tomato Proteins That Interact With Replication Initiator Protein (Rep) of the Geminivirus TYLCV. FRONTIERS IN PLANT SCIENCE 2020; 11:1069. [PMID: 32760417 PMCID: PMC7373745 DOI: 10.3389/fpls.2020.01069] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 06/29/2020] [Indexed: 05/23/2023]
Abstract
Geminiviruses are plant-infecting DNA viruses that reshape the intracellular environment of their host in order to create favorable conditions for viral replication and propagation. Viral manipulation is largely mediated via interactions between viral and host proteins. Identification of this protein network helps us to understand how these viruses manipulate their host and therefore provides us potentially with novel leads for resistance against this class of pathogens, as genetic variation in the corresponding plant genes could subvert viral manipulation. Different studies have already yielded a list of host proteins that interact with one of the geminiviral proteins. Here, we use affinity purification followed by mass spectrometry (AP-MS) to further expand this list of interacting proteins, focusing on an important host (tomato) and the Replication initiator protein (Rep, AL1, C1) from Tomato yellow leaf curl virus (TYLCV). Rep is the only geminiviral protein proven to be essential for geminiviral replication and it forms an integral part of viral replisomes, a protein complex that consists of plant and viral proteins that allows for viral DNA replication. Using AP-MS, fifty-four 'high confidence' tomato proteins were identified that specifically co-purified with Rep. For two of them, an unknown EWS-like RNA-binding protein (called Geminivirus Rep interacting EWS-like protein 1 or GRIEP1) and an isoform of the THO complex subunit 4A (ALY1), we were able to confirm this interaction with Rep in planta using a second method, bimolecular fluorescence complementation (BiFC). The THO subunit 4 is part of the THO/TREX (TRanscription-EXport) complex, which controls RNA splicing and nuclear export of mRNA to the cytoplasm and is also connected to plant disease resistance. This work represents the first step towards characterization of novel host factors with a putative role in the life cycle of TYLCV and possibly other geminiviruses.
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Affiliation(s)
- Francesca Maio
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
| | - Tieme A. Helderman
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
| | - Manuel Arroyo-Mateos
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
| | - Miguel van der Wolf
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
| | - Sjef Boeren
- Laboratory of Biochemistry, Wageningen University, Wageningen, Netherlands
| | - Marcel Prins
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
- Keygene N.V., Wageningen, Netherlands
| | - Harrold A. van den Burg
- Molecular Plant Pathology, Swammerdam Institute for Life Sciences (SILS), University of Amsterdam, Amsterdam, Netherlands
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26
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Picart-Picolo A, Picart C, Picault N, Pontvianne F. Nucleolus-associated chromatin domains are maintained under heat stress, despite nucleolar reorganization in Arabidopsis thaliana. JOURNAL OF PLANT RESEARCH 2020; 133:463-470. [PMID: 32372397 DOI: 10.1007/s10265-020-01201-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Accepted: 04/17/2020] [Indexed: 05/23/2023]
Abstract
Several layers of mechanisms participate in plant adaptation to heat-stress. For example, the plant metabolism switches from cell growth mode to stress adaptation mode. Ribosome biogenesis is one of the most energy costly pathways. That biogenesis process occurs in the nucleolus, the largest nuclear compartment, whose structure is highly dependent on this pathway. We used a nucleolar marker to track the structure of the nucleolus, and revealed a change in its sub-nucleolar distribution under heat stress. In addition, the nucleolus is implicated in other cellular processes, such as genome organization within the nucleus. However, our analyses of nucleolus-associated chromatin domains under heat stress did not reveal significant differences compared to the control plants, suggesting a lack of connection between two of the main functions of the nucleolus: ribosome biogenesis and nuclear organization.
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Affiliation(s)
- Ariadna Picart-Picolo
- CNRS, LGDP UMR5096, Université de Perpignan, Perpignan, France
- UPVD, LGDP UMR5096, Université de Perpignan, Perpignan, France
| | - Claire Picart
- CNRS, LGDP UMR5096, Université de Perpignan, Perpignan, France
- UPVD, LGDP UMR5096, Université de Perpignan, Perpignan, France
| | - Nathalie Picault
- CNRS, LGDP UMR5096, Université de Perpignan, Perpignan, France
- UPVD, LGDP UMR5096, Université de Perpignan, Perpignan, France
| | - Frederic Pontvianne
- CNRS, LGDP UMR5096, Université de Perpignan, Perpignan, France.
- UPVD, LGDP UMR5096, Université de Perpignan, Perpignan, France.
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27
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Ferreira R, Schneekloth JS, Panov KI, Hannan KM, Hannan RD. Targeting the RNA Polymerase I Transcription for Cancer Therapy Comes of Age. Cells 2020; 9:cells9020266. [PMID: 31973211 PMCID: PMC7072222 DOI: 10.3390/cells9020266] [Citation(s) in RCA: 103] [Impact Index Per Article: 25.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Revised: 01/14/2020] [Accepted: 01/15/2020] [Indexed: 12/24/2022] Open
Abstract
Transcription of the ribosomal RNA genes (rDNA) that encode the three largest ribosomal RNAs (rRNA), is mediated by RNA Polymerase I (Pol I) and is a key regulatory step for ribosomal biogenesis. Although it has been reported over a century ago that the number and size of nucleoli, the site of ribosome biogenesis, are increased in cancer cells, the significance of this observation for cancer etiology was not understood. The realization that the increase in rRNA expression has an active role in cancer progression, not only through increased protein synthesis and thus proliferative capacity but also through control of cellular check points and chromatin structure, has opened up new therapeutic avenues for the treatment of cancer through direct targeting of Pol I transcription. In this review, we discuss the rational of targeting Pol I transcription for the treatment of cancer; review the current cancer therapeutics that target Pol I transcription and discuss the development of novel Pol I-specific inhibitors, their therapeutic potential, challenges and future prospects.
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Affiliation(s)
- Rita Ferreira
- ACRF Department of Cancer Biology and Therapeutics, The John Curtin School of Medical Research, Australian National University, Acton 2601, NSW, Australia; (K.I.P.); (K.M.H.); (R.D.H.)
- Correspondence:
| | - John S. Schneekloth
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Frederick, MD 21702, USA;
| | - Konstantin I. Panov
- ACRF Department of Cancer Biology and Therapeutics, The John Curtin School of Medical Research, Australian National University, Acton 2601, NSW, Australia; (K.I.P.); (K.M.H.); (R.D.H.)
- CCRCB and School of Biological Sciences, Queen’s University Belfast Medical Biology Centre, School of Biological Sciences, Queen’s University Belfast, Belfast BT9 7BL, UK
| | - Katherine M. Hannan
- ACRF Department of Cancer Biology and Therapeutics, The John Curtin School of Medical Research, Australian National University, Acton 2601, NSW, Australia; (K.I.P.); (K.M.H.); (R.D.H.)
- Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, VIC 3010, Australia
| | - Ross D. Hannan
- ACRF Department of Cancer Biology and Therapeutics, The John Curtin School of Medical Research, Australian National University, Acton 2601, NSW, Australia; (K.I.P.); (K.M.H.); (R.D.H.)
- Department of Biochemistry and Molecular Biology, University of Melbourne, Parkville, VIC 3010, Australia
- Peter MacCallum Cancer Centre, 305 Grattan St, Melbourne, VIC 3000, Australia
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, VIC 3800, Australia
- School of Biomedical Sciences, University of Queensland, Brisbane, QLD 4072, Australia
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28
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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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29
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Iacovella MG, Bremang M, Basha O, Giacò L, Carotenuto W, Golfieri C, Szakal B, Dal Maschio M, Infantino V, Beznoussenko GV, Joseph CR, Visintin C, Mironov AA, Visintin R, Branzei D, Ferreira-Cerca S, Yeger-Lotem E, De Wulf P. Integrating Rio1 activities discloses its nutrient-activated network in Saccharomyces cerevisiae. Nucleic Acids Res 2019; 46:7586-7611. [PMID: 30011030 PMCID: PMC6125641 DOI: 10.1093/nar/gky618] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2018] [Accepted: 06/28/2018] [Indexed: 12/14/2022] Open
Abstract
The Saccharomyces cerevisiae kinase/adenosine triphosphatase Rio1 regulates rDNA transcription and segregation, pre-rRNA processing and small ribosomal subunit maturation. Other roles are unknown. When overexpressed, human ortholog RIOK1 drives tumor growth and metastasis. Likewise, RIOK1 promotes 40S ribosomal subunit biogenesis and has not been characterized globally. We show that Rio1 manages directly and via a series of regulators, an essential signaling network at the protein, chromatin and RNA levels. Rio1 orchestrates growth and division depending on resource availability, in parallel to the nutrient-activated Tor1 kinase. To define the Rio1 network, we identified its physical interactors, profiled its target genes/transcripts, mapped its chromatin-binding sites and integrated our data with yeast’s protein–protein and protein–DNA interaction catalogs using network computation. We experimentally confirmed network components and localized Rio1 also to mitochondria and vacuoles. Via its network, Rio1 commands protein synthesis (ribosomal gene expression, assembly and activity) and turnover (26S proteasome expression), and impinges on metabolic, energy-production and cell-cycle programs. We find that Rio1 activity is conserved to humans and propose that pathological RIOK1 may fuel promiscuous transcription, ribosome production, chromosomal instability, unrestrained metabolism and proliferation; established contributors to cancer. Our study will advance the understanding of numerous processes, here revealed to depend on Rio1 activity.
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Affiliation(s)
- Maria G Iacovella
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Michael Bremang
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy.,Current address: Proteome Sciences Plc, Hamilton House, Mabledon Place, London, United Kingdom
| | - Omer Basha
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel
| | - Luciano Giacò
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Walter Carotenuto
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy
| | - Cristina Golfieri
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Barnabas Szakal
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy
| | - Marianna Dal Maschio
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Valentina Infantino
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Galina V Beznoussenko
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy
| | - Chinnu R Joseph
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy
| | - Clara Visintin
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Alexander A Mironov
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy
| | - Rosella Visintin
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy
| | - Dana Branzei
- The FIRC Institute of Molecular Oncology (IFOM), Via Adamello 16, 20139 Milan, Italy.,Istituto di Genetica Molecolare, Consiglio Nazionale delle Ricerche (CNR), Via Abbiategrasso 207, 27100 Pavia, Italy
| | - Sébastien Ferreira-Cerca
- Lehrstuhl für Biochemie III, Universität Regensburg, Universitätsstraße 31, 93053 Regensburg, Germany
| | - Esti Yeger-Lotem
- Department of Clinical Biochemistry and Pharmacology, Faculty of Health Sciences and the National Institute for Biotechnology in the Negev, Ben-Gurion University of the Negev, POB 653, Beer-Sheva 84105, Israel
| | - Peter De Wulf
- Department of Experimental Oncology, European Institute of Oncology, Via Adamello 16, 20139 Milan, Italy.,Centre for Integrative Biology (CIBIO), University of Trento, Via Sommarive 9, 38123 Trento, Italy
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30
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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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31
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Yan Q, Zhu C, Guang S, Feng X. The Functions of Non-coding RNAs in rRNA Regulation. Front Genet 2019; 10:290. [PMID: 31024617 PMCID: PMC6463246 DOI: 10.3389/fgene.2019.00290] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2018] [Accepted: 03/18/2019] [Indexed: 02/04/2023] Open
Abstract
Ribosomes are ribonucleoprotein machines that decode the genetic information embedded in mRNAs into polypeptides. Ribosome biogenesis is tightly coordinated and controlled from the transcription of pre-rRNAs to the assembly of ribosomes. Defects or disorders in rRNA production result in a number of human ribosomopathy diseases. During the processes of rRNA synthesis, non-coding RNAs, especially snoRNAs, play important roles in pre-rRNA transcription, processing, and maturation. Recent research has started to reveal that other long and short non-coding RNAs, including risiRNA, LoNA, and SLERT (among others), are also involved in pre-rRNA transcription and rRNA production. Here, we summarize the current understanding of the mechanisms of non-coding RNA-mediated rRNA generation and regulation and their biological roles.
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Affiliation(s)
- Qi Yan
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Chengming Zhu
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, China
| | - Shouhong Guang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, China.,CAS Center for Excellence in Molecular Cell Science, Chinese Academy of Sciences, Hefei, China
| | - Xuezhu Feng
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, China
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Mechanism of the natural product moracin-O derived MO-460 and its targeting protein hnRNPA2B1 on HIF-1α inhibition. Exp Mol Med 2019; 51:1-14. [PMID: 30755586 PMCID: PMC6372683 DOI: 10.1038/s12276-018-0200-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 10/12/2018] [Accepted: 10/16/2018] [Indexed: 02/06/2023] Open
Abstract
Hypoxia-inducible factor-1α (HIF-1α) mediates tumor cell adaptation to hypoxic conditions and is a potentially important anticancer therapeutic target. We previously developed a method for synthesizing a benzofuran-based natural product, (R)-(-)-moracin-O, and obtained a novel potent analog, MO-460 that suppresses the accumulation of HIF-1α in Hep3B cells. However, the molecular target and underlying mechanism of action of MO-460 remained unclear. In the current study, we identified heterogeneous nuclear ribonucleoprotein A2B1 (hnRNPA2B1) as a molecular target of MO-460. MO-460 inhibits the initiation of HIF-1α translation by binding to the C-terminal glycine-rich domain of hnRNPA2B1 and inhibiting its subsequent binding to the 3’-untranslated region of HIF-1α mRNA. Moreover, MO-460 suppresses HIF-1α protein synthesis under hypoxic conditions and induces the accumulation of stress granules. The data provided here suggest that hnRNPA2B1 serves as a crucial molecular target in hypoxia-induced tumor survival and thus offer an avenue for the development of novel anticancer therapies. A synthetic analog of a chemical found in fruit suppresses tumor growth by targeting an RNA-binding protein (hnRNPA2B1) and preventing the production of a pro-cancer regulatory factor. Nak-Kyun Soung from the Korea Research Institute of Bioscience and Biotechnology, Cheongju, South Korea, and coworkers built on their previous discovery that a compound derived from a medicinal plant metabolite can suppress the activity of hypoxia-inducible factor-1α (HIF-1α). This protein, which is involved in many aspects of cancer biology, is activated in the low-oxygen microenvironments found inside tumors. The researchers show that the compound binds to a protein that helps with the conversion of HIF-1α–encoding RNA transcripts into HIF-1α proteins. Liver cancer cells treated with the compound grew slowly and produced less HIF-1α under both normal and low-oxygen culture conditions, highlighting the potential of this anti-cancer strategy.
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Li Y, Yu S, Wang X, Ye X, He B, Quan M, Gao Y. SRPK1 facilitates tumor cell growth via modulating the small nucleolar RNA expression in gastric cancer. J Cell Physiol 2019; 234:13582-13591. [PMID: 30633341 DOI: 10.1002/jcp.28036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2018] [Accepted: 11/30/2018] [Indexed: 01/11/2023]
Abstract
Serine-arginine protein kinase 1 (SRPK1) is the main regulator in alternative splicing by phosphorylating splicing factors rich in serine/arginine repeats. Its overexpression has been found in multiple cancer types and contributes to cancer development. Here we report the role of SRPK1 and underlying mechanism in gastric cancer (GC) cell growth. We found that SRPK1 was frequently upregulated in GC samples compared with their adjacent corresponding normal tissues by immunohistochemistry and western blot analysis. Knockdown of SRPK1 in GC cells suppressed cell growth in cell viability assays, colony formation assays and nude mice xenograft model, whereas overexpression of SRPK1 promotes opposite phenotypes in these assays. By a complementary DNA microarray analysis, we found that SRPK1 knockdown had significant inhibitory effects on a majority of small nucleolar RNAs expression. Among them, snoRA42, snoRA74A, and snoRD10 were selected for further functional experiments. Cell growth curves on a plate and in soft agar indicated that the three snoRNAs play potential oncogenic function in GC. In addition, SRPK1 could co-immunoprecipitated with NCL, a nucleolar phosphoprotein involved in the synthesis and maturation of ribosomes. These results suggested that SRPK1 contributes to GC development by a new possible mechanism involving snoRNAs mediated signaling.
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Affiliation(s)
- Yandong Li
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.,Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Shijun Yu
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiao Wang
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Xiaojuan Ye
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China.,Department of Hematology & Oncology, the People's Hospital of Beilun District, Beilun Branch Hospital of the First Affiliated Hospital of Medical School of Zhejiang University, Ningbo, China
| | - Bin He
- Research Center for Translational Medicine, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Ming Quan
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
| | - Yong Gao
- Department of Oncology, Shanghai East Hospital, Tongji University School of Medicine, Shanghai, China
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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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Olson CO, Pejhan S, Kroft D, Sheikholeslami K, Fuss D, Buist M, Ali Sher A, Del Bigio MR, Sztainberg Y, Siu VM, Ang LC, Sabourin-Felix M, Moss T, Rastegar M. MECP2 Mutation Interrupts Nucleolin-mTOR-P70S6K Signaling in Rett Syndrome Patients. Front Genet 2018; 9:635. [PMID: 30619462 PMCID: PMC6305968 DOI: 10.3389/fgene.2018.00635] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 11/27/2018] [Indexed: 01/26/2023] Open
Abstract
Rett syndrome (RTT) is a severe and rare neurological disorder that is caused by mutations in the X-linked MECP2 (methyl CpG-binding protein 2) gene. MeCP2 protein is an important epigenetic factor in the brain and in neurons. In Mecp2-deficient neurons, nucleoli structures are compromised. Nucleoli are sites of active ribosomal RNA (rRNA) transcription and maturation, a process mainly controlled by nucleolin and mechanistic target of rapamycin (mTOR)-P70S6K signaling. Currently, it is unclear how nucleolin-rRNA-mTOR-P70S6K signaling from RTT cellular model systems translates into human RTT brain. Here, we studied the components of nucleolin-rRNA-mTOR-P70S6K signaling in the brain of RTT patients with common T158M and R255X mutations. Immunohistochemical examination of T158M brain showed disturbed nucleolin subcellular localization, which was absent in Mecp2-deficient homozygous male or heterozygote female mice, compared to wild type (WT). We confirmed by Western blot analysis that nucleolin protein levels are altered in RTT brain, but not in Mecp2-deficient mice. Further, we studied the expression of rRNA transcripts in Mecp2-deficient mice and RTT patients, as downstream molecules that are controlled by nucleolin. By data mining of published ChIP-seq studies, we showed MeCP2-binding at the multi-copy rRNA genes in the mouse brain, suggesting that rRNA might be a direct MeCP2 target gene. Additionally, we observed compromised mTOR-P70S6K signaling in the human RTT brain, a molecular pathway that is upstream of rRNA-nucleolin molecular conduits. RTT patients showed significantly higher phosphorylation of active mTORC1 or mTORC2 complexes compared to age- and sex-matched controls. Correlational analysis of mTORC1/2-P70S6K signaling pathway identified multiple points of deviation from the control tissues that may result in abnormal ribosome biogenesis in RTT brain. To our knowledge, this is the first report of deregulated nucleolin-rRNA-mTOR-P70S6K signaling in the human RTT brain. Our results provide important insight toward understanding the molecular properties of human RTT brain.
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Affiliation(s)
- Carl O Olson
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Shervin Pejhan
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Daniel Kroft
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Kimia Sheikholeslami
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada.,Faculty of Medicine, University of Toronto, Toronto, ON, Canada
| | - David Fuss
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Marjorie Buist
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Annan Ali Sher
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Marc R Del Bigio
- Department of Pathology, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
| | - Yehezkel Sztainberg
- Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, United States
| | - Victoria Mok Siu
- Division of Medical Genetics, Department of Paediatrics, Schulich School of Medicine, Western University, London, ON, Canada
| | - Lee Cyn Ang
- Department of Pathology, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada
| | - Marianne Sabourin-Felix
- Cancer Division of the Quebec University Hospital Research Centre, Department of Molecular Biology, Medical Biochemistry and Pathology, Faculty of Medicine, Laval University, Quebec City, QC, Canada
| | - Tom Moss
- Cancer Division of the Quebec University Hospital Research Centre, Department of Molecular Biology, Medical Biochemistry and Pathology, Faculty of Medicine, Laval University, Quebec City, QC, Canada
| | - Mojgan Rastegar
- Regenerative Medicine Program, and Department of Biochemistry and Medical Genetics, Max Rady College of Medicine, Rady Faculty of Health Sciences, University of Manitoba, Winnipeg, MB, Canada
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36
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Vasaturo M, Cotugno R, Fiengo L, Vinegoni C, Dal Piaz F, De Tommasi N. The anti-tumor diterpene oridonin is a direct inhibitor of Nucleolin in cancer cells. Sci Rep 2018; 8:16735. [PMID: 30425290 PMCID: PMC6233161 DOI: 10.1038/s41598-018-35088-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2018] [Accepted: 10/25/2018] [Indexed: 11/15/2022] Open
Abstract
The bioactive plant diterpene oridonin displays important pharmacological activities and is widely used in traditional Chinese medicine; however, its molecular mechanism of action is still incompletely described. In vitro and in vivo data have demonstrated anti-tumor activity of oridonin and its ability to interfere with several cell pathways; however, presently only the molecular chaperone HSP70 has been identified as a direct potential target of this compound. Here, using a combination of different proteomic approaches, innovative Cellular Thermal Shift Assay (CETSA) experiments, and classical biochemical methods, we demonstrate that oridonin interacts with Nucleolin, effectively modulating the activity of this multifunctional protein. The ability of oridonin to target Nucleolin and/or HSP70 could account for the bioactivity profile of this plant diterpene. Recently, Nucleolin has attracted attention as a druggable target, as its diverse functions are implicated in pathological processes such as cancer, inflammation, and viral infection. However, up to now, no small molecule as Nucleolin binders has been reported, thus our finding represents the first evidence of Nucleolin modulation by a small inhibitor.
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Affiliation(s)
- Michele Vasaturo
- Università degli Studi di Salerno, Department of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
- Università degli Studi di Salerno, Ph. D. School of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
| | - Roberta Cotugno
- Università degli Studi di Salerno, Department of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
| | - Lorenzo Fiengo
- Università degli Studi di Salerno, Department of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
- Università degli Studi di Salerno, Ph. D. School of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
| | - Claudio Vinegoni
- Harvard Medical School, MGH Center for Systems Biology, 185 Cambridge Steet, 02144, Boston, MA, USA
| | - Fabrizio Dal Piaz
- Università degli Studi di Salerno, Department of Medicine and Surgery, Via S. Allende, 84081, Baronissi, (SA), Italy.
| | - Nunziatina De Tommasi
- Università degli Studi di Salerno, Department of Pharmacy, Via Giovanni Paolo II, 84084, Fisciano, (SA), Italy
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37
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Šašinková M, Holoubek A, Otevřelová P, Kuželová K, Brodská B. AML-associated mutation of nucleophosmin compromises its interaction with nucleolin. Int J Biochem Cell Biol 2018; 103:65-73. [PMID: 30130654 DOI: 10.1016/j.biocel.2018.08.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2018] [Revised: 08/15/2018] [Accepted: 08/16/2018] [Indexed: 11/17/2022]
Abstract
C-terminal mutations of the nucleolar protein nucleophosmin (NPM) are the most frequent genetic aberration detected in acute myeloid leukemia (AML) with normal karyotype. The mutations cause aberrant cytoplasmic localization of NPM and lead to loss of functions associated with NPM nucleolar localization, e.g. in ribosome biogenesis or DNA-damage repair. NPM has many interaction partners and some of them were proved to interact also with the mutated form (NPMmut) and due to this interaction thereby to be withdrawn from their site of action. We analyzed the impact of the mutation on NPM interaction with nucleolin (NCL) which is also prevalently localized into the nucleolus and cooperates with wild-type NPM (NPMwt) in many cellular processes. We revealed that the NCL-NPM complex formation is completely abolished by the mutation and that the presence/absence of the interaction is not affected by drugs causing genotoxic stress or differentiation. Deregulation resulting from changes of NCL/NPMwt ratio may contribute to leukemogenesis.
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Affiliation(s)
- Markéta Šašinková
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic
| | - Aleš Holoubek
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic
| | - Petra Otevřelová
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic
| | - Kateřina Kuželová
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic
| | - Barbora Brodská
- Institute of Hematology and Blood Transfusion, U Nemocnice 1, 128 20 Prague 2, Czech Republic.
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38
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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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Abstract
The nucleolus as site of ribosome biogenesis holds a pivotal role in cell metabolism. It is composed of ribosomal DNA (rDNA), which is present as tandem arrays located in nucleolus organizer regions (NORs). In interphase cells, rDNA can be found inside and adjacent to nucleoli and the location is indicative for transcriptional activity of ribosomal genes-inactive rDNA (outside) versus active one (inside). Moreover, the nucleolus itself acts as a spatial organizer of non-nucleolar chromatin. Microscopy-based approaches offer the possibility to explore the spatially distinct localization of the different DNA populations in relation to the nucleolar structure. Recent technical developments in microscopy and preparatory methods may further our understanding of the functional architecture of nucleoli. This review will attempt to summarize the current understanding of mammalian nucleolar chromatin organization as seen from a microscopist's perspective.
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Affiliation(s)
- Christian Schöfer
- Division of Cell and Developmental Biology, Center for Anatomy and Cell Biology, Medical University of Vienna, Schwarzspanierstr. 17, 1090, Vienna, Austria.
| | - Klara Weipoltshammer
- Division of Cell and Developmental Biology, Center for Anatomy and Cell Biology, Medical University of Vienna, Schwarzspanierstr. 17, 1090, Vienna, Austria
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40
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Li D, Zhang J, Wang M, Li X, Gong H, Tang H, Chen L, Wan L, Liu Q. Activity dependent LoNA regulates translation by coordinating rRNA transcription and methylation. Nat Commun 2018; 9:1726. [PMID: 29712923 PMCID: PMC5928123 DOI: 10.1038/s41467-018-04072-4] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2017] [Accepted: 03/28/2018] [Indexed: 12/27/2022] Open
Abstract
The ribosome is indispensable for precisely controlling the capacity of protein synthesis. However, how translational machinery is coordinated to meet the translational demands remains elusive. Here, we identify a nucleolar-specific lncRNA (LoNA), its 5' portion binds and sequesters nucleolin to suppress rRNA transcription, and its snoRNA like 3' end recruits and diminishes fibrillarin activity to reduce rRNA methylation. Activity-dependent decrease of LoNA leads to elevated rRNA and ribosome levels, an increased proportion of polysomes, mRNA polysome loading, and protein translation. In addition, transport of ribosomes to synapses is particularly promoted, resulting in increased levels of AMPA/NMDA receptor, enhanced synaptic plasticity, long-term potentiation and consolidated memory. Strikingly, hippocampal LoNA deficiency not only enhances long-term memory in WT mice, but also restores impaired memory function in APP/PS1 transgenic mice. Together, these findings reveal the multifaceted role of LoNA in modulating ribosome biogenesis to meet the translational demands of long-term memory.
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MESH Headings
- 5' Untranslated Regions
- Amyloid beta-Protein Precursor/genetics
- Amyloid beta-Protein Precursor/metabolism
- Animals
- Cell Line, Tumor
- Chromosomal Proteins, Non-Histone/genetics
- Chromosomal Proteins, Non-Histone/metabolism
- Hippocampus/cytology
- Hippocampus/metabolism
- Long-Term Potentiation/genetics
- Memory, Long-Term/physiology
- Methylation
- Mice
- Mice, Inbred C57BL
- Mice, Transgenic
- Neurons/cytology
- Neurons/metabolism
- Phosphoproteins/genetics
- Phosphoproteins/metabolism
- Presenilin-1/genetics
- Presenilin-1/metabolism
- Protein Biosynthesis
- RNA, Long Noncoding/genetics
- RNA, Long Noncoding/metabolism
- RNA, Ribosomal/genetics
- RNA, Ribosomal/metabolism
- RNA, Small Nucleolar/genetics
- RNA, Small Nucleolar/metabolism
- RNA-Binding Proteins/genetics
- RNA-Binding Proteins/metabolism
- Receptors, AMPA/genetics
- Receptors, AMPA/metabolism
- Receptors, N-Methyl-D-Aspartate/genetics
- Receptors, N-Methyl-D-Aspartate/metabolism
- Ribosomes/genetics
- Ribosomes/metabolism
- Synapses/genetics
- Transgenes
- Nucleolin
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Affiliation(s)
- Dingfeng Li
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
- Neurodegenerative Disease Research Center, University of Science and Technology of China, Hefei, 230026, China
| | - Juan Zhang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
- Neurodegenerative Disease Research Center, University of Science and Technology of China, Hefei, 230026, China
| | - Ming Wang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
| | - Xiaohui Li
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
- Neurodegenerative Disease Research Center, University of Science and Technology of China, Hefei, 230026, China
| | - Huarui Gong
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
| | - Huiping Tang
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
| | - Lin Chen
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China
| | - Lili Wan
- Department of Biochemistry and Biophysics, Howard Hughes Medical Institute, School of Medicine, University of Pennsylvania, Philadelphia, PA, 19104, USA
| | - Qiang Liu
- Hefei National Laboratory for Physical Sciences at the Microscale, School of Life Sciences, University of Science and Technology of China, Hefei, 230026, China.
- CAS Key Laboratory of Brain Function and Disease, University of Science and Technology of China, Hefei, 230026, China.
- Neurodegenerative Disease Research Center, University of Science and Technology of China, Hefei, 230026, China.
- National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, 230029, China.
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Novel, Moon and Mars, partial gravity simulation paradigms and their effects on the balance between cell growth and cell proliferation during early plant development. NPJ Microgravity 2018; 4:9. [PMID: 29644337 PMCID: PMC5884789 DOI: 10.1038/s41526-018-0041-4] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/01/2018] [Revised: 02/28/2018] [Accepted: 03/06/2018] [Indexed: 01/29/2023] Open
Abstract
Clinostats and Random Positioning Machine (RPM) are used to simulate microgravity, but, for space exploration, we need to know the response of living systems to fractional levels of gravity (partial gravity) as they exist on Moon and Mars. We have developed and compared two different paradigms to simulate partial gravity using the RPM, one by implementing a centrifuge on the RPM (RPMHW), the other by applying specific software protocols to driving the RPM motors (RPMSW). The effects of the simulated partial gravity were tested in plant root meristematic cells, a system with known response to real and simulated microgravity. Seeds of Arabidopsis thaliana were germinated under simulated Moon (0.17 g) and Mars (0.38 g) gravity. In parallel, seeds germinated under simulated microgravity (RPM), or at 1 g control conditions. Fixed root meristematic cells from 4-day grown seedlings were analyzed for cell proliferation rate and rate of ribosome biogenesis using morphometrical methods and molecular markers of the regulation of cell cycle and nucleolar activity. Cell proliferation appeared increased and cell growth was depleted under Moon gravity, compared with the 1 g control. The effects were even higher at the Moon level than at simulated microgravity, indicating that meristematic competence (balance between cell growth and proliferation) is also affected at this gravity level. However, the results at the simulated Mars level were close to the 1 g static control. This suggests that the threshold for sensing and responding to gravity alteration in the root would be at a level intermediate between Moon and Mars gravity. Both partial g simulation strategies seem valid and show similar results at Moon g-levels, but further research is needed, in spaceflight and simulation facilities, especially around and beyond Mars g levels to better understand more precisely the differences and constrains in the use of these facilities for the space biology community. Novel simulators of partial gravity show that the threshold for plants to sense and respond to gravity in their roots lies somewhere between gravity levels of the Moon and Mars. An international team led by Jack van Loon from the VU University Medical Center in Amsterdam, the Netherlands, reconfigured the hardware (include centrifugation) and software (new algorithm) on a microgravity-simulating instrument known as a Random Positioning Machine to produce fractional levels of gravity similar to those found on Mars (0.38 g) and the Moon (0.17 g). They germinated seeds of thale cress (Arabidopsis thaliana) in these devices, and showed in 4-day old seedlings that the balance between cell proliferation and cell growth in the roots was out of whack in both simulated microgravity and Moon gravity levels, but not in a simulated Mars scenario.
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Zhang X, Xiao S, Rameau RD, Devany E, Nadeem Z, Caglar E, Ng K, Kleiman FE, Saxena A. Nucleolin phosphorylation regulates PARN deadenylase activity during cellular stress response. RNA Biol 2018; 15:251-260. [PMID: 29168431 PMCID: PMC5798948 DOI: 10.1080/15476286.2017.1408764] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2017] [Revised: 09/11/2017] [Accepted: 11/16/2017] [Indexed: 01/28/2023] Open
Abstract
Nucleolin (NCL) is an abundant stress-responsive, RNA-binding phosphoprotein that controls gene expression by regulating either mRNA stability and/or translation. NCL binds to the AU-rich element (ARE) in the 3'UTR of target mRNAs, mediates miRNA functions in the nearby target sequences, and regulates mRNA deadenylation. However, the mechanism by which NCL phosphorylation affects these functions and the identity of the deadenylase involved, remain largely unexplored. Earlier we demonstrated that NCL phosphorylation is vital for cell cycle progression and proliferation, whereas phosphorylation-deficient NCL at six consensus CK2 sites confers dominant-negative effect on proliferation by increasing p53 expression, possibly mimicking cellular DNA damage conditions. In this study, we show that NCL phosphorylation at those CK2 consensus sites in the N-terminus is necessary to induce deadenylation upon oncogenic stimuli and UV stress. NCL-WT, but not hypophosphorylated NCL-6/S*A, activates poly (A)-specific ribonuclease (PARN) deadenylase activity. We further demonstrate that NCL interacts directly with PARN, and under non-stress conditions also forms (a) complex (es) with factors that regulate deadenylation, such as p53 and the ARE-binding protein HuR. Upon UV stress, the interaction of hypophosphorylated NCL-6/S*A with these proteins is favored. As an RNA-binding protein, NCL interacts with PARN deadenylase substrates such as TP53 and BCL2 mRNAs, playing a role in their downregulation under non-stress conditions. For the first time, we show that NCL phosphorylation offers specificity to its protein-protein, protein-RNA interactions, resulting in the PARN deadenylase regulation, and hence gene expression, during cellular stress responses.
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Affiliation(s)
- Xiaokan Zhang
- Chemistry Department, Hunter College, New York, NY, USA
| | - Shu Xiao
- Biology Department, Brooklyn College, Brooklyn, NY, USA
| | | | - Emral Devany
- Chemistry Department, Hunter College, New York, NY, USA
| | - Zaineb Nadeem
- Biology Department, Brooklyn College, Brooklyn, NY, USA
| | - Elif Caglar
- Biology Department, Brooklyn College, Brooklyn, NY, USA
| | - Kenneth Ng
- Biology Department, Brooklyn College, Brooklyn, NY, USA
| | | | - Anjana Saxena
- Biology Department, Brooklyn College, Brooklyn, NY, USA
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Wolfson E, Solomon S, Schmukler E, Goldshmit Y, Pinkas-Kramarski R. Nucleolin and ErbB2 inhibition reduces tumorigenicity of ErbB2-positive breast cancer. Cell Death Dis 2018; 9:47. [PMID: 29352243 PMCID: PMC5833446 DOI: 10.1038/s41419-017-0067-7] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 10/01/2017] [Accepted: 10/17/2017] [Indexed: 12/14/2022]
Abstract
ErbB2, a member of the ErbB family of receptor tyrosine kinases, is an essential player in the cell's growth and proliferation signaling pathways. Amplification or overexpression of ErbB2 is observed in ∼30% of breast cancer patients, and often drives cellular transformation and cancer development. Recently, we have shown that ErbB2 interacts with the nuclear-cytoplasmic shuttling protein nucleolin, an interaction which enhances cell transformation in vitro, and increases mortality risk and disease progression rate in human breast cancer patients. Given these results, and since acquired resistance to anti-ErbB2-targeted therapy is a major obstacle in treatment of breast cancer, we have examined the therapeutic potential of targeting the ErbB2-nucleolin complex. The effect of the nucleolin-specific inhibitor GroA (AS1411) on ErbB2-positive breast cancer was tested in vivo, in a mouse xenograft model for breast cancer; as well as in vitro, alone and in combination with the ErbB2 kinase-inhibitor tyrphostin AG-825. Here, we show that in vivo treatment of ErbB2-positive breast tumor xenografts with GroA reduces tumor size and leads to decreased ErbB2-mediated signaling. Moreover, we found that co-treatment of breast cancer cell lines with GroA and the ErbB2 kinase-inhibitor tyrphostin AG-825 enhances the anti-cancer effects exerted by GroA alone in terms of cell viability, mortality, migration, and invasiveness. We, therefore, suggest a novel therapeutic approach, consisting of combined inhibition of ErbB2 and nucleolin, which has the potential to improve breast cancer treatment efficacy.
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Affiliation(s)
- Eya Wolfson
- Department of Neurobiology, Faculty of Life Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Shira Solomon
- Department of Neurobiology, Faculty of Life Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Eran Schmukler
- Department of Neurobiology, Faculty of Life Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Yona Goldshmit
- Department of Neurobiology, Faculty of Life Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel
| | - Ronit Pinkas-Kramarski
- Department of Neurobiology, Faculty of Life Science, Tel-Aviv University, Ramat-Aviv, 69978, Israel.
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Yan Y, Du Y, Wang G, Li K. Non-structural protein 1 of H3N2 influenza A virus induces nucleolar stress via interaction with nucleolin. Sci Rep 2017; 7:17761. [PMID: 29259342 PMCID: PMC5736645 DOI: 10.1038/s41598-017-18087-2] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2017] [Accepted: 12/05/2017] [Indexed: 02/05/2023] Open
Abstract
The nucleolus is a stress sensor associated with cell cycle progression and a central hub for the replication of pathogenic RNA viruses. However, the role of nucleolus in influenza A virus infection has not been well studied. Here we show that the interaction between NS1 protein of influenza A/Shantou/602/06 (H3N2) and nucleolin, a ubiquitous protein of nucleolus repressed RNA Pol I-dependent transcription via establishing hyper-methylation in the UCE of rRNA gene promoter. NS1 expressed cells showed significant association of ribosomal proteins with MDM2, and p53 accumulation, suggesting induced nucleolar stress. Disruption of the interaction of NS1 with nucleolin or overexpression of nucleolin in NS1 expressed cells revived RNA Pol I-dependent transcription, indicating nucleolin could be one target for NS1 to repress rRNA synthesis of host cells. Our present study suggests that NS1 protein of H3N2 could induce nucleolar stress based on epigenetic alteration of rRNA gene promoter via interaction with nucleolin.
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Affiliation(s)
- Yinxia Yan
- Key Laboratory of Infectious Diseases and Molecular Immunopathology of Guangdong Province, Department of Microbiology and Immunology, Shantou University Medical College, Shantou, Guangdong Province, China
| | - Yongming Du
- Key Laboratory of Infectious Diseases and Molecular Immunopathology of Guangdong Province, Department of Microbiology and Immunology, Shantou University Medical College, Shantou, Guangdong Province, China
| | - Gefei Wang
- Key Laboratory of Infectious Diseases and Molecular Immunopathology of Guangdong Province, Department of Microbiology and Immunology, Shantou University Medical College, Shantou, Guangdong Province, China.
| | - Kangsheng Li
- Key Laboratory of Infectious Diseases and Molecular Immunopathology of Guangdong Province, Department of Microbiology and Immunology, Shantou University Medical College, Shantou, Guangdong Province, China.
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Liu Y, Mattila J, Ventelä S, Yadav L, Zhang W, Lamichane N, Sundström J, Kauko O, Grénman R, Varjosalo M, Westermarck J, Hietakangas V. PWP1 Mediates Nutrient-Dependent Growth Control through Nucleolar Regulation of Ribosomal Gene Expression. Dev Cell 2017; 43:240-252.e5. [PMID: 29065309 DOI: 10.1016/j.devcel.2017.09.022] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/01/2017] [Accepted: 09/25/2017] [Indexed: 11/29/2022]
Abstract
Ribosome biogenesis regulates animal growth and is controlled by nutrient-responsive mTOR signaling. How ribosome biogenesis is regulated during the developmental growth of animals and how nutrient-responsive signaling adjusts ribosome biogenesis in this setting have remained insufficiently understood. We uncover PWP1 as a chromatin-associated regulator of developmental growth with a conserved role in RNA polymerase I (Pol I)-mediated rRNA transcription. We further observed that PWP1 epigenetically maintains the rDNA loci in a transcription-competent state. PWP1 responds to nutrition in Drosophila larvae via mTOR signaling through gene expression and phosphorylation, which controls the nucleolar localization of dPWP1. Our data further imply that dPWP1 acts synergistically with mTOR signaling to regulate the nucleolar localization of TFIIH, a known elongation factor of Pol I. Ribosome biogenesis is often deregulated in cancer, and we demonstrate that high PWP1 levels in human head and neck squamous cell carcinoma tumors are associated with poor prognosis.
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Affiliation(s)
- Ying Liu
- Department of Biosciences, University of Helsinki, 00790 Helsinki, Finland; Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Jaakko Mattila
- Department of Biosciences, University of Helsinki, 00790 Helsinki, Finland; Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Sami Ventelä
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, 20520 Turku, Finland
| | - Leena Yadav
- Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Wei Zhang
- Department of Biosciences, University of Helsinki, 00790 Helsinki, Finland; Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Nicole Lamichane
- Department of Biosciences, University of Helsinki, 00790 Helsinki, Finland; Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Jari Sundström
- Department of Pathology, University of Turku, 20520 Turku, Finland; Department of Pathology, Turku University Hospital, 20521 Turku, Finland
| | - Otto Kauko
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, 20520 Turku, Finland; Department of Pathology, University of Turku, 20520 Turku, Finland
| | - Reidar Grénman
- Department of Otorhinolaryngology - Head and Neck Surgery and Department of Medical Biochemistry and Genetics, University of Turku and Turku University Hospital, 20521 Turku, Finland
| | - Markku Varjosalo
- Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland
| | - Jukka Westermarck
- Turku Centre for Biotechnology, University of Turku and Åbo Akademi University, 20520 Turku, Finland; Department of Pathology, University of Turku, 20520 Turku, Finland
| | - Ville Hietakangas
- Department of Biosciences, University of Helsinki, 00790 Helsinki, Finland; Institute of Biotechnology, University of Helsinki, 00790 Helsinki, Finland.
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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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Moraleva A, Magoulas C, Polzikov M, Hacot S, Mertani HC, Diaz JJ, Zatsepina O. Involvement of the specific nucleolar protein SURF6 in regulation of proliferation and ribosome biogenesis in mouse NIH/3T3 fibroblasts. Cell Cycle 2017; 16:1979-1991. [PMID: 28873013 DOI: 10.1080/15384101.2017.1371880] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
The nucleolar proteins which link cell proliferation to ribosome biogenesis are regarded to be potentially oncogenic. Here, in order to examine the involvement of an evolutionary conserved nucleolar protein SURF6/Rrp14 in proliferation and ribosome biogenesis in mammalian cells, we established stably transfected mouse NIH/3T3 fibroblasts capable of conditional overexpression of the protein. Cell proliferation was monitored in real-time, and various cell cycle parameters were quantified based on flow cytometry, Br-dU-labeling and conventional microscopy data. We show that overexpression of SURF6 accelerates cell proliferation and promotes transition through all cell cycle phases. The most prominent SURF6 pro-proliferative effects include a significant reduction of the population doubling time, from 19.8 ± 0.7 to 16.2 ± 0.5 hours (t-test, p < 0.001), and of the length of cell division cycle, from 17.6 ± 0.6 to 14.0 ± 0.4 hours (t-test, p < 0.001). The later was due to the shortening of all cell cycle phases but the length of G1 period was reduced most, from 5.7 ± 0.4 to 3.8 ± 0.3 hours, or by ∼30%, (t-test, p < 0.05). By Northern blots and qRT-PCR, we further showed that the acceleration of cell proliferation was concomitant with an accumulation of rRNA species along both ribosomal subunit maturation pathways. It is evident, therefore, that like the yeast homologue Rrp14, mammalian SURF6 is involved in various steps of rRNA processing during ribosome biogenesis. We concluded that SURF6 is a novel positive regulator of proliferation and G1/S transition in mammals, implicating that SURF6 is a potential oncogenic protein, which can be further studied as a putative target in anti-cancer therapy.
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Affiliation(s)
- Anastasiia Moraleva
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation
| | - Charalambos Magoulas
- b Centre for Investigative and Diagnostic Oncology, Department of Natural Sciences, School of Science and Technology , Middlesex University , London , United Kingdom
| | - Mikhail Polzikov
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation
| | - Sabine Hacot
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Hichem C Mertani
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Jean-Jacques Diaz
- c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
| | - Olga Zatsepina
- a Shemyakin-Ovchinnikov Institute of Bioorganic Chemistry, Russian Academy of Sciences , Moscow , Russian Federation.,c Centre de Recherche en Cancérologie de Lyon, UMR INSERM 1052-CNRS 5286, Centre Léon Bérard , Université Claude Bernard Lyon I, Université de Lyon , Lyon , France
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48
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Cheng F, Belting M, Fransson LÅ, Mani K. Nucleolin is a nuclear target of heparan sulfate derived from glypican-1. Exp Cell Res 2017; 354:31-39. [PMID: 28300561 DOI: 10.1016/j.yexcr.2017.03.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2017] [Revised: 03/09/2017] [Accepted: 03/10/2017] [Indexed: 12/11/2022]
Abstract
The recycling, S-nitrosylated heparan sulfate (HS) proteoglycan glypican-1 releases anhydromannose (anMan)-containing HS chains by a nitrosothiol-catalyzed cleavage in endosomes that can be constitutive or induced by ascorbate. The HS-anMan chains are then transported to the nucleus. A specific nuclear target for HS-anMan has not been identified. We have monitored endosome-to-nucleus trafficking of HS-anMan by deconvolution and confocal immunofluorescence microscopy using an anMan-specific monoclonal antibody in non-growing, ascorbate-treated, and growing, untreated, wild-type mouse embryonic fibroblasts and hypoxia-exposed Alzheimer mouse Tg2576 fibroblasts and human U87 glioblastoma cells. In all cells, nuclear HS-anMan targeted a limited number of sites of variable size where it colocalized with DNA and nucleolin, an established marker for nucleoli. HS-anMan also colocalized with ethynyl uridine-tagged nascent RNA and two acetylated forms of histone H3. Acute hypoxia increased the formation of HS-anMan in both Tg2576 and U87 cells. A portion of HS-anMan colocalized with nucleolin at small discrete sites, while most of the nucleolin and nascent RNA was dispersed. In U87 cells, HS-anMan, nucleolin and nascent RNA reassembled after prolonged hypoxia. Nucleolar HS may modulate synthesis and/or release of rRNA.
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Affiliation(s)
- Fang Cheng
- Department of Experimental Medical Science, Division of Neuroscience, Glycobiology Group, Lund University, Biomedical Center A13, SE-221 84 Lund, Sweden
| | - Mattias Belting
- Department of Clinical Sciences, Section of Oncology and Pathology, Lund University, Lund, Sweden
| | - Lars-Åke Fransson
- Department of Experimental Medical Science, Division of Neuroscience, Glycobiology Group, Lund University, Biomedical Center A13, SE-221 84 Lund, Sweden
| | - Katrin Mani
- Department of Experimental Medical Science, Division of Neuroscience, Glycobiology Group, Lund University, Biomedical Center A13, SE-221 84 Lund, Sweden.
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Udomchalothorn T, Plaimas K, Sripinyowanich S, Boonchai C, Kojonna T, Chutimanukul P, Comai L, Buaboocha T, Chadchawan S. OsNucleolin1-L Expression in Arabidopsis Enhances Photosynthesis via Transcriptome Modification under Salt Stress Conditions. PLANT & CELL PHYSIOLOGY 2017; 58:717-734. [PMID: 28204743 DOI: 10.1093/pcp/pcx024] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2016] [Accepted: 02/02/2017] [Indexed: 05/06/2023]
Abstract
OsNUC1 encodes rice nucleolin, which has been shown to be involved in salt stress responses. Expression of the full-length OsNUC1 gene in Arabidopsis resulted in hypersensitivity to ABA during germination. Transcriptome analysis of the transgenic lines, in comparison with the wild type, revealed that the RNA abundance of >1,900 genes was significantly changed under normal growth conditions, while under salt stress conditions the RNAs of 999 genes were found to be significantly regulated. Gene enrichment analysis showed that under normal conditions OsNUC1 resulted in repression of genes involved in photosynthesis, while in salt stress conditions OsNUC1 increased expression of the genes involved in the light-harvesting complex. Correspondingly, the net rate of photosynthesis of the transgenic lines was increased under salt stress. Transgenic rice lines with overexpression of the OsNUC1-L gene were generated and tested for photosynthetic performance under salt stress conditions. The transgenic rice lines treated with salt stress at the booting stage had a higher photosynthetic rate and stomatal conductance in flag leaves and second leaves than the wild type. Moreover, higher contents of Chl a and carotenoids were found in flag leaves of the transgenic rice. These results suggest a role for OsNUC1 in the modification of the transcriptome, especially the gene transcripts responsible for photosynthesis, leading to stabilization of photosynthesis under salt stress conditions.
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Affiliation(s)
- Thanikarn Udomchalothorn
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Kitiporn Plaimas
- AVIC research center, Department of Mathematics and Computer Science, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Omics Science and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Siriporn Sripinyowanich
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Agricultural Technology Division, Faculty of Arts and Science, Sisaket Rajabhat University, Sisaket, Thailand
| | - Chutamas Boonchai
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Thammaporn Kojonna
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Panita Chutimanukul
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Luca Comai
- Department of Plant Biology and Genome Center, University of California Davis, Davis, CA, USA
| | - Teerapong Buaboocha
- Omics Science and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Department of Biochemistry, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
| | - Supachitra Chadchawan
- Center of Excellence in Environment and Plant Physiology, Department of Botany, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
- Omics Science and Bioinformatics Center, Faculty of Science, Chulalongkorn University, Bangkok, Thailand
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50
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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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