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You Y, Peng B, Ben S, Hou W, Sun L, Jiang W. Lead Neurotoxicity on Human Neuroblastoma Cell Line SH-SY5Y is Mediated via Transcription Factor EGR1/Zif268 Induced Disrupted in Scherophernia-1 Activation. Neurochem Res 2018; 43:1308-1316. [PMID: 29868983 DOI: 10.1007/s11064-018-2539-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2017] [Revised: 04/23/2018] [Accepted: 04/27/2018] [Indexed: 11/24/2022]
Abstract
Lead (Pb2+) is a well-known type of neurotoxin and chronic exposure to Pb2+ induces cognition dysfunction. In this work, the potential role of early growth response gene 1 (EGR1) in the linkage of Pb2+ exposure and disrupted in scherophernia-1 (DISC1) activity was investigated. Human neuroblastoma cell line SH-SY5Y was subjected to different concentrations of lead acetate (PbAc) to determine the effect of Pb2+ exposure on the cell viability, apoptosis, and activity of EGR1 and DISC1. Then the expression of EGR1 in SH-SY5Y cells was knocked down with specific siRNA to assess the function of EGR1 in Pb2+ induced activation of DISC1. The interaction between EGR1 and DISC1 was further validated with dual luciferase assay, Supershift electrophoretic mobility shift assay (EMSA), and chromatin immunoprecipitation (ChIP)-PCR. Administration of PbAc decreased cell viability and induced apoptosis in SH-SY5Y cells in a dose-dependent manner. Additionally, exposure to PbAc also up-regulated expression of EGR1 and DISC1 at all concentrations. Knockdown of EGR1 blocked the effect of PbAc on SH-SY5Y cells, indicating the central role of EGR1 in the function of Pb2+ on activity of DISC1. Based on the results of dual luciferase assay, Supershift EMSA, and ChIP-PCR, EGR1 mediated the effect of Pb2+ on DISC1 by directly bound to the promoter region of DISC1 gene. The current study elaborated the mechanism involved in the effect of Pb2+ exposure on expression of DISC1 for the first time: EGR1 activated by Pb2+ substitution of zinc triggered the transcription of DISC1 gene by directly binding to its promoter.
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Affiliation(s)
- Yuanyuan You
- Department of Genetic, Shenyang Maternity and Child Health Hospital, Shenyang, People's Republic of China
| | - Bo Peng
- Outpatient Department, China Medical University, Shenyang, People's Republic of China
| | - Songbin Ben
- Life Science College, Liaoning University, Shenyang, People's Republic of China
| | - Weijian Hou
- Department of Tissue Engineering, China Medical University, Shenyang, People's Republic of China
| | - Liguang Sun
- Department of Biochemical and Molecular Biology, China Medical University, No. 77 of Puhe Road, Beixin District, Shenyang, 110127, Liaoning, People's Republic of China.
| | - Wei Jiang
- Department of Biological Science, Liaoning Academy of Analytical Sciences, Shenyang, People's Republic of China
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de Klerk N, Saroj SD, Wassing GM, Maudsdotter L, Jonsson AB. The Host Cell Transcription Factor EGR1 Is Induced by Bacteria through the EGFR-ERK1/2 Pathway. Front Cell Infect Microbiol 2017; 7:16. [PMID: 28180113 PMCID: PMC5264520 DOI: 10.3389/fcimb.2017.00016] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2016] [Accepted: 01/12/2017] [Indexed: 12/01/2022] Open
Abstract
The essential first step in bacterial colonization is adhesion to the host epithelial cells. The early host-responses post-bacterial adhesions are still poorly understood. Early growth response 1 (EGR1) is an early response transcriptional regulator that can be rapidly induced by various environmental stimuli. Several bacteria can induce EGR1 expression in host cells, but the involved bacterial characteristics and the underlying molecular mechanisms of this response are largely unknown. Here, we show that EGR1 can be induced in host epithelial cells by different species of bacteria independent of the adherence level, Gram-staining type and pathogenicity. However, bacterial viability and contact with host cells is necessary, indicating that an active interaction between bacteria and the host is important. Furthermore, the strongest response is observed in cells originating from the natural site of the infection, suggesting that the EGR1 induction is cell type specific. Finally, we show that EGFR–ERK1/2 and β1-integrin signaling are the main pathways used for bacteria-mediated EGR1 upregulation. In conclusion, the increase of EGR1 expression in epithelial cells is a common stress induced, cell type specific response upon host-bacteria interaction that is mediated by EGFR–ERK1/2 and β1-integrin signaling.
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Affiliation(s)
- Nele de Klerk
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University Stockholm, Sweden
| | - Sunil D Saroj
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University Stockholm, Sweden
| | - Gabriela M Wassing
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University Stockholm, Sweden
| | - Lisa Maudsdotter
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University Stockholm, Sweden
| | - Ann-Beth Jonsson
- Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University Stockholm, Sweden
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Veyrac A, Besnard A, Caboche J, Davis S, Laroche S. The transcription factor Zif268/Egr1, brain plasticity, and memory. PROGRESS IN MOLECULAR BIOLOGY AND TRANSLATIONAL SCIENCE 2014; 122:89-129. [PMID: 24484699 DOI: 10.1016/b978-0-12-420170-5.00004-0] [Citation(s) in RCA: 130] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
The capacity to remember our past experiences and organize our future draws on a number of cognitive processes that allow our brain to form and store neural representations that can be recalled and updated at will. In the brain, these processes require mechanisms of neural plasticity in the activated circuits, brought about by cellular and molecular changes within the neurons activated during learning. At the cellular level, a wealth of experimental data accumulated in recent years provides evidence that signaling from synapses to nucleus and the rapid regulation of the expression of immediate early genes encoding inducible, regulatory transcription factors is a key step in the mechanisms underlying synaptic plasticity and the modification of neural networks required for the laying down of memories. In the activated neurons, these transcriptional events are thought to mediate the activation of selective gene programs and subsequent synthesis of proteins, leading to stable functional and structural remodeling of the activated networks, so that the memory can later be reactivated upon recall. Over the past few decades, novel insights have been gained in identifying key transcriptional regulators that can control the genomic response of synaptically activated neurons. Here, as an example of this approach, we focus on one such activity-dependent transcription factor, Zif268, known to be implicated in neuronal plasticity and memory formation. We summarize current knowledge about the regulation and function of Zif268 in different types of brain plasticity and memory processes.
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Affiliation(s)
- Alexandra Veyrac
- CNRS, Centre de Neurosciences Paris-Sud, UMR 8195, Orsay, France; Centre de Neurosciences Paris-Sud, Univ Paris-Sud, UMR 8195, Orsay, France
| | - Antoine Besnard
- Harvard Stem Cell Institute, Harvard Medical School, Center for Regenerative Medicine, Massachusetts General Hospital, Boston, Massachusetts, USA
| | - Jocelyne Caboche
- INSERM, UMRS 952, Physiopathologie des Maladies du Système Nerveux Central, Paris, France; CNRS, UMR7224, Physiopathologie des Maladies du Système Nerveux Central, Paris, France; UPMC University Paris 6, Paris, France
| | - Sabrina Davis
- CNRS, Centre de Neurosciences Paris-Sud, UMR 8195, Orsay, France; Centre de Neurosciences Paris-Sud, Univ Paris-Sud, UMR 8195, Orsay, France
| | - Serge Laroche
- CNRS, Centre de Neurosciences Paris-Sud, UMR 8195, Orsay, France; Centre de Neurosciences Paris-Sud, Univ Paris-Sud, UMR 8195, Orsay, France
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Li J, Chen Y, Qin X, Wen J, Ding H, Xia W, Li S, Su X, Wang W, Li H, Zhao Q, Fang T, Qu L, Shao N. MiR-138 downregulates miRNA processing in HeLa cells by targeting RMND5A and decreasing Exportin-5 stability. Nucleic Acids Res 2013; 42:458-74. [PMID: 24057215 PMCID: PMC3874158 DOI: 10.1093/nar/gkt839] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
MicroRNAs (miRNAs) are a class of non-coding small RNAs that consist of ∼22 nt and are involved in several biological processes by regulating target gene expression. MiR-138 has many biological functions and is often downregulated in cancers. Our results showed that overexpression of miR-138 downregulated target RMND5A (required for meiotic nuclear division 5 homolog A) and reduced Exportin-5 stability, which results in decreased levels of pre-miRNA nuclear export in HeLa cells. We also found that miR-138 could significantly inhibit HeLa cell migration by targeting RMND5A. Our study therefore identifies miR-138–RMND5A–Exportin-5 as a previously unknown miRNA processing regulatory pathway in HeLa cells.
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Affiliation(s)
- Jie Li
- Department of Biochemistry and Molecular Biology, Beijing Institute of Basic Medical Sciences, Beijing 100850, China and Key Laboratory of Gene Engineering of the Ministry of Education, State Key Laboratory for Biocontrol, Sun Yat-sen University, Guangzhou, 510275, China
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Decreased dicer expression enhances SRP-mediated protein targeting. PLoS One 2013; 8:e56950. [PMID: 23468895 PMCID: PMC3585229 DOI: 10.1371/journal.pone.0056950] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2012] [Accepted: 01/16/2013] [Indexed: 12/29/2022] Open
Abstract
We have shown that Dicer processes 7SL RNA into different fragments ranging from ∼20 to more than 200 nucleotides. Here we addressed the molecular functions of these 7SL RNA fragments and found that some of them functioned as dominant-negative regulators of the full-length 7SL RNA, interfering with signal recognition particle (SRP) complex formation. Transfection of these 7SL RNA fragments inhibited the expression of cell surface glycoproteins, the targeting of a reporter protein to the endoplasmic reticulum, and the secretion of secreted alkaline phosphatase. These results suggest that some Dicer-processed 7SL RNA fragments interfered with SRP-mediated protein targeting. Moreover, we showed that Dicer knockdown enhanced SRP-mediated protein targeting and that transfection of a mixture of the 7SL RNA fragments partially restored this effect. Our data indicate that Dicer can fine-tune the efficiency of SRP-mediated protein targeting via processing a proportion of 7SL RNA into fragments of different lengths.
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Kuang Y, Cai J, Li D, Han Q, Cao J, Wang Z. Repression of Dicer is associated with invasive phenotype and chemoresistance in ovarian cancer. Oncol Lett 2013; 5:1149-1154. [PMID: 23599754 PMCID: PMC3629258 DOI: 10.3892/ol.2013.1158] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2012] [Accepted: 12/12/2012] [Indexed: 11/29/2022] Open
Abstract
Dicer is a key enzyme that processes microRNA (miRNA) precursors into their mature form, enabling them to regulate gene expression. However, the effects of Dicer on the biological behavior of cancer cells remain largely unclear. In this study, it was demonstrated that Dicer down-regulation promoted cell proliferation, migration and cell cycle progression in A2780 and SKOV3 ovarian cancer cells. Furthermore, Dicer expression was significantly decreased in cisplatin-resistant A2780 cells (A2780/DDP) compared with parental A2780 cells. Knockdown of Dicer by RNA interference decreased the sensitivity of A2780 cells to cisplatin. Moreover, EZH2 depletion by short hairpin RNA (shRNA) increased the expression of Dicer in vitro. Our data suggest that Dicer is involved in numerous biological/pathological processes, including drug resistance in ovarian cancer, and that its expression may be regulated by EZH2.
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Affiliation(s)
- Yan Kuang
- Department of Obstetrics and Gynecology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022; ; Department of Obstetrics and Gynecology, First Affiliated Hospital, GuangXi Medical University, Nanning 530021, P.R. China
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Manente AG, Pinton G, Tavian D, Lopez-Rodas G, Brunelli E, Moro L. Coordinated sumoylation and ubiquitination modulate EGF induced EGR1 expression and stability. PLoS One 2011; 6:e25676. [PMID: 21998680 PMCID: PMC3187784 DOI: 10.1371/journal.pone.0025676] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2011] [Accepted: 09/08/2011] [Indexed: 11/18/2022] Open
Abstract
Background Human early growth response-1 (EGR1) is a member of the zing-finger family of transcription factors induced by a range of molecular and environmental stimuli including epidermal growth factor (EGF). In a recently published paper we demonstrated that integrin/EGFR cross-talk was required for Egr1 expression through activation of the Erk1/2 and PI3K/Akt/Forkhead pathways. EGR1 activity and stability can be influenced by many different post-translational modifications such as acetylation, phosphorylation, ubiquitination and the recently discovered sumoylation. The aim of this work was to assess the influence of sumoylation on EGF induced Egr1 expression and/or stability. Methods We modulated the expression of proteins involved in the sumoylation process in ECV304 cells by transient transfection and evaluated Egr1 expression in response to EGF treatment at mRNA and protein levels. Results We demonstrated that in ECV304 cells Egr1 was transiently induced upon EGF treatment and a fraction of the endogenous protein was sumoylated. Moreover, SUMO-1/Ubc9 over-expression stabilized EGF induced ERK1/2 phosphorylation and increased Egr1 gene transcription. Conversely, in SUMO-1/Ubc9 transfected cells, EGR1 protein levels were strongly reduced. Data obtained from protein expression and ubiquitination analysis, in the presence of the proteasome inhibitor MG132, suggested that upon EGF stimuli EGR1 sumoylation enhanced its turnover, increasing ubiquitination and proteasome mediated degradation. Conclusions Here we demonstrate that SUMO-1 modification improving EGR1 ubiquitination is involved in the modulation of its stability upon EGF mediated induction.
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Affiliation(s)
- Arcangela Gabriella Manente
- Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, University of Piemonte Orientale “A. Avogadro”, Novara, Italy
| | - Giulia Pinton
- Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, University of Piemonte Orientale “A. Avogadro”, Novara, Italy
| | - Daniela Tavian
- Department of Psychology, Catholic University of the Sacred Heart, Milan, Italy
| | | | - Elisa Brunelli
- Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, University of Piemonte Orientale “A. Avogadro”, Novara, Italy
| | - Laura Moro
- Dipartimento di Scienze Chimiche, Alimentari, Farmaceutiche e Farmacologiche, University of Piemonte Orientale “A. Avogadro”, Novara, Italy
- * E-mail:
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