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Kumps C, Fieuw A, Mestdagh P, Menten B, Lefever S, Pattyn F, De Brouwer S, Sante T, Schulte JH, Schramm A, Van Roy N, Van Maerken T, Noguera R, Combaret V, Devalck C, Westermann F, Laureys G, Eggert A, Vandesompele J, De Preter K, Speleman F. Focal DNA copy number changes in neuroblastoma target MYCN regulated genes. PLoS One 2013; 8:e52321. [PMID: 23308108 PMCID: PMC3537730 DOI: 10.1371/journal.pone.0052321] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2012] [Accepted: 11/16/2012] [Indexed: 02/07/2023] Open
Abstract
Neuroblastoma is an embryonic tumor arising from immature sympathetic nervous system cells. Recurrent genomic alterations include MYCN and ALK amplification as well as recurrent patterns of gains and losses of whole or large partial chromosome segments. A recent whole genome sequencing effort yielded no frequently recurring mutations in genes other than those affecting ALK. However, the study further stresses the importance of DNA copy number alterations in this disease, in particular for genes implicated in neuritogenesis. Here we provide additional evidence for the importance of focal DNA copy number gains and losses, which are predominantly observed in MYCN amplified tumors. A focal 5 kb gain encompassing the MYCN regulated miR-17∼92 cluster as sole gene was detected in a neuroblastoma cell line and further analyses of the array CGH data set demonstrated enrichment for other MYCN target genes in focal gains and amplifications. Next we applied an integrated genomics analysis to prioritize MYCN down regulated genes mediated by MYCN driven miRNAs within regions of focal heterozygous or homozygous deletion. We identified RGS5, a negative regulator of G-protein signaling implicated in vascular normalization, invasion and metastasis, targeted by a focal homozygous deletion, as a new MYCN target gene, down regulated through MYCN activated miRNAs. In addition, we expand the miR-17∼92 regulatory network controlling TGFß signaling in neuroblastoma with the ring finger protein 11 encoding gene RNF11, which was previously shown to be targeted by the miR-17∼92 member miR-19b. Taken together, our data indicate that focal DNA copy number imbalances in neuroblastoma (1) target genes that are implicated in MYCN signaling, possibly selected to reinforce MYCN oncogene addiction and (2) serve as a resource for identifying new molecular targets for treatment.
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Affiliation(s)
- Candy Kumps
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Annelies Fieuw
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Pieter Mestdagh
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Björn Menten
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Steve Lefever
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Filip Pattyn
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Sara De Brouwer
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Tom Sante
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Johannes Hubertus Schulte
- Department of Pediatric Oncology and Haematology, University Children's Hospital Essen, Essen, Germany
| | - Alexander Schramm
- Department of Pediatric Oncology and Haematology, University Children's Hospital Essen, Essen, Germany
| | - Nadine Van Roy
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Tom Van Maerken
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Rosa Noguera
- Department of Pathology, Medical School, University of Valencia, Valencia, Spain
| | - Valérie Combaret
- Centre Léon Bérard, FNCLCC, Laboratoire de Recherche Translationnelle, Lyon, France
| | - Christine Devalck
- Children's University Hospital, Hematology-Oncology, Brussels, Belgium
| | - Frank Westermann
- Department of Tumor Genetics, German Cancer Research Center, Heidelberg, Germany
| | - Geneviève Laureys
- Department of Pediatric Hematology-Oncology, Ghent University Hospital, Ghent, Belgium
| | - Angelika Eggert
- Department of Pediatric Oncology and Haematology, University Children's Hospital Essen, Essen, Germany
| | - Jo Vandesompele
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Katleen De Preter
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
| | - Frank Speleman
- Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
- * E-mail:
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152
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Xie W, Li Z, Li M, Xu N, Zhang Y. miR-181a and inflammation: miRNA homeostasis response to inflammatory stimuli in vivo. Biochem Biophys Res Commun 2012; 430:647-52. [PMID: 23220232 DOI: 10.1016/j.bbrc.2012.11.097] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2012] [Accepted: 11/21/2012] [Indexed: 12/16/2022]
Abstract
Inflammatory stimuli are usually associated with homeostatic responses, which have an important function in protecting the body from excessive inflammatory damage. Previous studies reported the anti-inflammatory effect of miR-181a. The current study utilized two animal models of inflammation, induced by either lipopolysaccharides (LPS) or streptozotocin. We demonstrated that inflammatory stimuli significantly increase miR-181a expression, concurrently with inflammatory factors. In addition, the knock down of toll-like receptor 4 (TLR-4) by small interfering RNA in LPS-induced Raw264.7 cells significantly reduces the expression of both miR-181a and inflammatory factors. Furthermore, patients with inflammatory response show increased expression of miR-181a, which is strongly correlated with the expression of interleukin (IL)-1β, IL-6, and tumor necrosis factor alpha. These data indicate that the up-regulation of miR-181a may be associated with homeostatic response to inflammatory stimuli by TLR-4 pathway activation. Therefore, miR-181a may serve as a novel marker for inflammatory response.
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Affiliation(s)
- Weidong Xie
- Shenzhen Key Lab of Health Science and Technology, Division of Life Science & Health, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
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153
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A20: linking a complex regulator of ubiquitylation to immunity and human disease. NATURE REVIEWS. IMMUNOLOGY 2012. [PMID: 23059429 DOI: 10.1038/nri3313)] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
A20 (also known as TNFAIP3) is a potent anti-inflammatory signalling molecule that restricts multiple intracellular signalling cascades. Recent studies in three general areas have converged to highlight the clinical and biological importance of A20. First, human genetic studies have strongly linked polymorphisms and mutations in the gene encoding A20 to inflammatory, autoimmune and malignant diseases. Second, studies in gene-targeted mice have revealed that A20 regulates multiple immune cell functions and prevents experimental diseases that closely mimic human conditions. Third, biochemical studies have unveiled complex mechanisms by which A20 regulates ubiquitin-dependent nuclear factor-κB and cell-survival signals. Taken together, these studies are revealing the importance of A20-mediated regulation of ubiquitin-dependent signalling in human disease.
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154
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A20: linking a complex regulator of ubiquitylation to immunity and human disease. Nat Rev Immunol 2012; 12:774-85. [PMID: 23059429 DOI: 10.1038/nri3313] [Citation(s) in RCA: 394] [Impact Index Per Article: 32.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A20 (also known as TNFAIP3) is a potent anti-inflammatory signalling molecule that restricts multiple intracellular signalling cascades. Recent studies in three general areas have converged to highlight the clinical and biological importance of A20. First, human genetic studies have strongly linked polymorphisms and mutations in the gene encoding A20 to inflammatory, autoimmune and malignant diseases. Second, studies in gene-targeted mice have revealed that A20 regulates multiple immune cell functions and prevents experimental diseases that closely mimic human conditions. Third, biochemical studies have unveiled complex mechanisms by which A20 regulates ubiquitin-dependent nuclear factor-κB and cell-survival signals. Taken together, these studies are revealing the importance of A20-mediated regulation of ubiquitin-dependent signalling in human disease.
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