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Ribeiro MSP, Venturini LGR, Speck-Hernandez CA, Alabarse PVG, Xavier T, Taira TM, Duffles LF, Cunha FQ, Fukada SY. AMPKα1 negatively regulates osteoclastogenesis and mitigates pathological bone loss. J Biol Chem 2023; 299:105379. [PMID: 37871745 PMCID: PMC10692901 DOI: 10.1016/j.jbc.2023.105379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2023] [Revised: 09/25/2023] [Accepted: 10/04/2023] [Indexed: 10/25/2023] Open
Abstract
Osteoclasts are specialized cells responsible for bone resorption, a highly energy-demanding process. Focus on osteoclast metabolism could be a key for the treatment of osteolytic diseases including osteoporosis. In this context, AMP-activated protein kinase α1 (AMPKα1), an energy sensor highly expressed in osteoclasts, participates in the metabolic reconfiguration during osteoclast differentiation and activation. This study aimed to elucidate the role of AMPKα1 during osteoclastogenesis in vitro and its impact in bone loss in vivo. Using LysMcre/0AMPK⍺1f/f animals and LysMcre/0 as control, we evaluated how AMPKα1 interferes with osteoclastogenesis and bone resorption activity in vitro. We found that AMPKα1 is highly expressed in the early stages of osteoclastogenesis. Genetic deletion of AMPKα1 leads to increased gene expression of osteoclast differentiation and fusion markers. In addition, LysMcre/0AMPK⍺1f/f mice had an increased number and size of differentiated osteoclast. Accordingly, AMPKα1 negatively regulates bone resorption in vitro, as evidenced by the area of bone resorption in LysMcre/0AMPK⍺1f/f osteoclasts. Our data further demonstrated that AMPKα1 regulates mitochondrial fusion and fission markers upregulating Mfn2 and downregulating DRP1 (dynamics-related protein 1) and that Ctskcre/0AMPK⍺1f/f osteoclasts lead to an increase in the number of mitochondria in AMPK⍺1-deficient osteoclast. In our in vivo study, femurs from Ctskcre/0AMPK⍺1f/f animals exhibited bone loss associated with the increased number of osteoclasts, and there was no difference between Sham and ovariectomized group. Our data suggest that AMPKα1 acts as a negative regulator of osteoclastogenesis, and the depletion of AMPKα1 in osteoclast leads to a bone loss state similar to that observed after ovariectomy.
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Affiliation(s)
- Mariana S P Ribeiro
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Lucas G R Venturini
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Cesar A Speck-Hernandez
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Paulo V G Alabarse
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Thais Xavier
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Thaise M Taira
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Letícia F Duffles
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil
| | - Fernando Q Cunha
- Department of Pharmacology, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil; Center for Research in Inflammatory Diseases, CRID, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil
| | - Sandra Y Fukada
- Laboratory of Bone Biology, Department of BioMolecular Sciences, School of Pharmaceutical Sciences Ribeirão Preto, University of São Paulo, Ribeirão Preto, Brazil; Center for Research in Inflammatory Diseases, CRID, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Brazil.
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Wanderley CWS, Maganin A, Adjafre B, Mendes AS, Anibal Silva CE, Quadros AU, Luiz JPM, Silva CMS, Silva NR, Oliveira FF, Gomes FIF, Restrepo JLJ, Speck-Hernandez CA, Turaça F, Silva GVL, Pigatto GR, Nakaya HI, Mota JM, Barroso-Sousa R, Alves-Filho JC, Cunha TM, Cunha FQ. PD-1/PD-L1 inhibition enhances chemotherapy-induced neuropathic pain by suppressing neuroimmune antinociceptive signaling. Cancer Immunol Res 2022; 10:1299-1308. [DOI: 10.1158/2326-6066.cir-22-0003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2022] [Revised: 07/12/2022] [Accepted: 09/01/2022] [Indexed: 11/16/2022]
Abstract
Abstract
Cytotoxic agents synergize with immune checkpoint inhibitors and improve outcomes for patients with several cancer types. Nonetheless, a parallel increase in the incidence of dose-limiting side effects, such as peripheral neuropathy, is often observed. Here, we investigated the role of the PD-1/PD-L1 axis in the modulation of paclitaxel-induced neuropathic pain. We found that human and mouse neural tissues, including the dorsal root ganglion (DRG), expressed basal levels of PD-1 and PD-L1. During the development of paclitaxel-induced neuropathy, an increase in PD-L1 expression was observed in macrophages from the DRG. This effect depended on Toll-like receptor 4 (TLR4) activation by paclitaxel. Furthermore, PD-L1 inhibited pain behavior triggered by paclitaxel or formalin in mice, suggesting that PD-1/PD-L1 signaling attenuates peripheral neuropathy development. Consistent with this, we observed that the combined use of anti–PD-L1 plus paclitaxel increased mechanical allodynia and chronic neuropathy development induced by single agents. This effect was associated with higher expression of inflammatory markers (Tnf, Il6, and Cx3cr1) in peripheral nervous tissue. Together, these results suggest that PD-1/PD-L1 inhibitors enhance paclitaxel-induced neuropathic pain by suppressing PD-1/PD-L1 antinociceptive signaling.
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Affiliation(s)
| | - Alexandre Maganin
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Beatriz Adjafre
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Atlante S. Mendes
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Andreza Urba. Quadros
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | - Joao Paulo Mesquita. Luiz
- Center for Research in Inflammatory Diseases (CRID), Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil
| | | | - Nicole R. Silva
- Center for Research in Inflammatory Diseases (CRID) Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil, Ribeirao Preto, Sao Paulo, Brazil
| | - Francisco F. Oliveira
- Center for Research in Inflammatory Diseases (CRID), Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil
| | | | | | - Cesar A. Speck-Hernandez
- Center for Research in Inflammatory Diseases (CRID), Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil
| | - Fernanda Turaça
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Glauce R. Pigatto
- Ribeirao Preto Medical School, University of Sao Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Jose Mauricio Mota
- Instituto do Cancer do Estado de Sao Paulo, University of Sao Paulo, Sao Paulo, SP, Brazil
| | | | - Jose C. Alves-Filho
- Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, São Paulo, Brazil
| | | | - Fernando Q. Cunha
- Center for Research in Inflammatory Diseases (CRID), Ribeirao Preto Medical School, University of Sao Paulo, Ribeirao Preto, Sao Paulo, Brazil
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Duarte MJ, Mascarenhas RS, Assis AF, Tanaka PP, Speck-Hernandez CA, Passos GA. Autoimmune regulator act in synergism with thymocyte adhesion in the control of lncRNAs in medullary thymic epithelial cells. Mol Immunol 2021; 140:127-135. [PMID: 34700158 DOI: 10.1016/j.molimm.2021.10.005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2020] [Revised: 05/30/2021] [Accepted: 10/07/2021] [Indexed: 12/06/2022]
Abstract
The autoimmune regulator (Aire) gene in medullary thymic epithelial cells (mTECs) encodes the AIRE protein, which interacts with its partners within the nucleus. This "Aire complex" induces stalled RNA Pol II on chromatin to proceed with transcription elongation of a large set of messenger RNAs and microRNAs. Considering that RNA Pol II also transcribes long noncoding RNAs (lncRNAs), we hypothesized that Aire might be implicated in the upstream control of this RNA species. To test this, we employed a loss-of-function approach in which Aire knockout mTECs were compared to Aire wild-type mTECs for lncRNA transcriptional profiling both in vitro and in vivo model systems. RNA sequencing enables the differential expression profiling of lncRNAs when these cells adhere in vitro to thymocytes or do not adhere to them as a way to test the effect of cell adhesion. Sets of lncRNAs that are unique and that are shared in vitro and in vivo were identified. Among these, we found the Aire-dependent lncRNAs as for example, Platr28, Ifi30, Morrbid, Malat1, and Xist. This finding represents the first evidence that Aire mediates the transcription of lncRNAs in mTECs. Microarray hybridizations enabled us to observe that temporal thymocyte adhesion modulates the expression levels of such lncRNAs as Morrbid, Xist, and Fbxl12o after 36 h of adhesion. This finding shows the existence of a synergistic mechanism involving a link between thymocyte adhesion, Aire, and lncRNAs in mTECs that might be important for immune self-representation.
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Affiliation(s)
- Max Jordan Duarte
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Romário S Mascarenhas
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Amanda Freire Assis
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Pedro Paranhos Tanaka
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Cesar A Speck-Hernandez
- Program in Basic and Applied Immunology, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil
| | - Geraldo Aleixo Passos
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil; Program in Basic and Applied Immunology, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, SP, Brazil; Laboratory of Genetics and Molecular Biology, Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, USP, Ribeirão Preto, SP, Brazil; Center for Cell-Based Therapy in Dentistry, USP, Ribeirão Preto, SP, Brazil.
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Oliveira EH, Assis AF, Speck-Hernandez CA, Duarte MJ, Passos GA. Aire Gene Influences the Length of the 3' UTR of mRNAs in Medullary Thymic Epithelial Cells. Front Immunol 2020; 11:1039. [PMID: 32547551 PMCID: PMC7270294 DOI: 10.3389/fimmu.2020.01039] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2019] [Accepted: 04/29/2020] [Indexed: 12/15/2022] Open
Abstract
Aire is a transcriptional controller in medullary thymic epithelial cells (mTECs) modulating a set of peripheral tissue antigens (PTAs) and non-PTA mRNAs as well as miRNAs. Even miRNAs exerting posttranscriptional control of mRNAs in mTECs, the composition of miRNA-mRNA networks may differ. Under reduction in Aire expression, networks exhibited greater miRNA diversity controlling mRNAs. Variations in the number of 3'UTR binding sites of Aire-dependent mRNAs may represent a crucial factor that influence the miRNA interaction. To test this hypothesis, we analyzed through bioinformatics the length of 3'UTRs of a large set of Aire-dependent mRNAs. The data were obtained from existing RNA-seq of mTECs of wild type or Aire-knockout (KO) mice. We used computational algorithms as FASTQC, STAR and HTSEQ for sequence alignment and counting reads, DESEQ2 for the differential expression, 3USS for the alternative 3'UTRs and TAPAS for the alternative polyadenylation sites. We identified 152 differentially expressed mRNAs between these samples comprising those that encode PTAs as well as transcription regulators. In Aire KO mTECs, most of these mRNAs featured an increase in the length of their 3'UTRs originating additional miRNA binding sites and new miRNA controllers. Results from the in silico analysis were statistically significant and the predicted miRNA-mRNA interactions were thermodynamically stable. Even with no in vivo or in vitro experiments, they were adequate to show that lack of Aire in mTECs might favor the downregulation of PTA mRNAs and transcription regulators via miRNA control. This could unbalance the overall transcriptional activity in mTECs and thus the self-representation.
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Affiliation(s)
- Ernna H. Oliveira
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | | | - Cesar A. Speck-Hernandez
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Max Jordan Duarte
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
| | - Geraldo A. Passos
- Molecular Immunogenetics Group, Department of Genetics, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Brazil
- Laboratory of Genetics and Molecular Biology, Department of Basic and Oral Biology, School of Dentistry of Ribeirão Preto, USP, Ribeirão Preto, Brazil
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Colón DF, Wanderley CW, Franchin M, Silva CM, Hiroki CH, Castanheira FVS, Donate PB, Lopes AH, Volpon LC, Kavaguti SK, Borges VF, Speck-Hernandez CA, Ramalho F, Carlotti AP, Carmona F, Alves-Filho JC, Liew FY, Cunha FQ. Neutrophil extracellular traps (NETs) exacerbate severity of infant sepsis. Crit Care 2019; 23:113. [PMID: 30961634 PMCID: PMC6454713 DOI: 10.1186/s13054-019-2407-8] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/22/2018] [Accepted: 03/25/2019] [Indexed: 12/13/2022]
Abstract
Background Neutrophil extracellular traps (NETs) are innate defense mechanisms that are also implicated in the pathogenesis of organ dysfunction. However, the role of NETs in pediatric sepsis is unknown. Methods Infant (2 weeks old) and adult (6 weeks old) mice were submitted to sepsis by intraperitoneal (i.p.) injection of bacteria suspension or lipopolysaccharide (LPS). Neutrophil infiltration, bacteremia, organ injury, and concentrations of cytokine, NETs, and DNase in the plasma were measured. Production of reactive oxygen and nitrogen species and release of NETs by neutrophils were also evaluated. To investigate the functional role of NETs, mice undergoing sepsis were treated with antibiotic plus rhDNase and the survival, organ injury, and levels of inflammatory markers and NETs were determined. Blood samples from pediatric and adult sepsis patients were collected and the concentrations of NETs measured. Results Infant C57BL/6 mice subjected to sepsis or LPS-induced endotoxemia produced significantly higher levels of NETs than the adult mice. Moreover, compared to that of the adult mice, this outcome was accompanied by increased organ injury and production of inflammatory cytokines. The increased NETs were associated with elevated expression of Padi4 and histone H3 citrullination in the neutrophils. Furthermore, treatment of infant septic mice with rhDNase or a PAD-4 inhibitor markedly attenuated sepsis. Importantly, pediatric septic patients had high levels of NETs, and the severity of pediatric sepsis was positively correlated with the level of NETs. Conclusion This study reveals a hitherto unrecognized mechanism of pediatric sepsis susceptibility and suggests that NETs represents a potential target to improve clinical outcomes of sepsis. Electronic supplementary material The online version of this article (10.1186/s13054-019-2407-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- David F Colón
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Carlos W Wanderley
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, 60020-181, CE, Brazil
| | - Marcelo Franchin
- Department of Pharmacology, University of Campinas, Campinas, 13083-970, SP, Brazil
| | - Camila M Silva
- Department of Physiology and Pharmacology, Federal University of Ceará, Fortaleza, 60020-181, CE, Brazil
| | - Carlos H Hiroki
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Fernanda V S Castanheira
- Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Paula B Donate
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Alexandre H Lopes
- Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Leila C Volpon
- Pediatrics, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Silvia K Kavaguti
- Pediatrics, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Vanessa F Borges
- Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Cesar A Speck-Hernandez
- Department of Biochemistry and Immunology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Fernando Ramalho
- Department of Pathology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Ana P Carlotti
- Pediatrics, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Fabio Carmona
- Pediatrics, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, 14049-900, SP, Brazil
| | - Jose C Alves-Filho
- Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil
| | - Foo Y Liew
- Division of Immunology, Infection and Inflammation, Glasgow Biomedical Research Centre, University of Glasgow, Glasgow, G128QQ, UK. .,School of Biology and Basic Medical Science, Soochow University, Suzhou, 215006, JS, China.
| | - Fernando Q Cunha
- Department of Pharmacology, School of Medicine of Ribeirão Preto, University of São Paulo, Ribeirão Preto, SP, 14049-900, Brazil.
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Wanderley CW, Colon DF, Luiz JPM, Oliveira FF, Viacava PR, Leite CA, Pereira JA, Silva CM, Silva CR, Silva RL, Speck-Hernandez CA, Mota JM, Alves-Filho JC, Lima-Júnior RC, Cunha TM, Cunha FQ. Paclitaxel reduces tumor growth by reprogramming tumor-associated macrophages to an M1- profile in a TLR4-dependent manner. Cancer Res 2018; 78:5891-5900. [DOI: 10.1158/0008-5472.can-17-3480] [Citation(s) in RCA: 151] [Impact Index Per Article: 25.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2017] [Revised: 05/23/2018] [Accepted: 06/18/2018] [Indexed: 12/18/2022]
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Speck-Hernandez CA, Assis AF, Felicio RF, Cotrim-Sousa L, Pezzi N, Lopes GS, Bombonato-Prado KF, Giuliatti S, Passos GA. Aire Disruption Influences the Medullary Thymic Epithelial Cell Transcriptome and Interaction With Thymocytes. Front Immunol 2018; 9:964. [PMID: 29867946 PMCID: PMC5949327 DOI: 10.3389/fimmu.2018.00964] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Accepted: 04/18/2018] [Indexed: 11/13/2022] Open
Abstract
The function of medullary thymic epithelial cells (mTECs) is associated with thymocyte adhesion, which is crucial for the negative selection of autoreactive thymocytes in the thymus. This process represents the root of central tolerance of self-components and prevents the onset of autoimmune diseases. Since thymic epithelia correspond to an important target of donor T cells during the onset of chronic graft-vs-host-disease, mTEC-thymocyte adhesion may have implications for alloimmunity. The Aire and Fezf2 genes function as transcriptome controllers in mTECs. The central question of this study is whether there is a mutual relationship between mTEC-thymocyte adhesion and the control of the mTEC transcriptome and whether Aire is involved in this process. Here, we show that in vitro mTEC-thymocyte adhesion causes transcriptome changes in mTECs and upregulates the transcriptional expression of Aire and Fezf2, as well as cell adhesion-related genes such as Cd80 or Tcf7, among others. Crispr-Cas9-mediated Aire gene disruption demonstrated that this gene plays a role in the process of mTEC-thymocyte adhesion. Consistent with the nuclear localization signal (NLS) encoded by Aire exon 3, which was targeted, we demonstrate that Aire KO-/- mTECs impair AIRE protein localization in the nucleus. Consequently, the loss of function of Aire reduced the ability of these cells to adhere to thymocytes. Their transcriptomes differed from their wild-type Aire+/+ counterparts, even during thymocyte adhesion. A set of mRNA isoforms that encode proteins involved in cell adhesion were also modulated during this process. This demonstrates that both thymocyte interactions and Aire influence transcriptome profiling of mTEC cells.
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Affiliation(s)
- Cesar A. Speck-Hernandez
- Graduate Programme in Basic and Applied Immunology, Universidade de São Paulo, São Paulo, Brazil
| | - Amanda F. Assis
- Molecular Immunogenetics Group, Genetics, Ribeirão Preto Medical School, Universidade de São Paulo, São Paulo, Brazil
| | - Rafaela F. Felicio
- Graduate Programme in Basic and Applied Immunology, Universidade de São Paulo, São Paulo, Brazil
| | - Larissa Cotrim-Sousa
- Molecular Immunogenetics Group, Genetics, Ribeirão Preto Medical School, Universidade de São Paulo, São Paulo, Brazil
| | - Nicole Pezzi
- Graduate Programme in Basic and Applied Immunology, Universidade de São Paulo, São Paulo, Brazil
| | - Gabriel S. Lopes
- Graduate Programme in Cellular and Molecular Biology, Ribeirão Preto Medical School, Universidade de São Paulo, São Paulo, Brazil
| | - Karina F. Bombonato-Prado
- Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
| | - Silvana Giuliatti
- Genetics, Bioinformatics Group, Ribeirão Preto Medical School, Universidade de São Paulo, São Paulo, Brazil
| | - Geraldo A. Passos
- Molecular Immunogenetics Group, Genetics, Ribeirão Preto Medical School, Universidade de São Paulo, São Paulo, Brazil
- Morphology, Physiology and Basic Pathology, School of Dentistry of Ribeirão Preto, Universidade de São Paulo, São Paulo, Brazil
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Reyes-Herrera PH, Speck-Hernandez CA, Sierra CA, Herrera S. BackCLIP: a tool to identify common background presence in PAR-CLIP datasets. Bioinformatics 2015; 31:3703-5. [PMID: 26227145 DOI: 10.1093/bioinformatics/btv442] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2015] [Accepted: 07/19/2015] [Indexed: 11/14/2022] Open
Abstract
MOTIVATION PAR-CLIP, a CLIP-seq protocol, derives a transcriptome wide set of binding sites for RNA-binding proteins. Even though the protocol uses stringent washing to remove experimental noise, some of it remains. A recent study measured three sets of non-specific RNA backgrounds which are present in several PAR-CLIP datasets. However, a tool to identify the presence of common background in PAR-CLIP datasets is not yet available. RESULTS We used the measured sets of non-specific RNA backgrounds to build a common background set. Each element from the common background set has a score that reflects its presence in several PAR-CLIP datasets. We present a tool that uses this score to identify the amount of common backgrounds present in a PAR-CLIP dataset, and we provide the user the option to use or remove it. We used the proposed strategy in 30 PAR-CLIP datasets from nine proteins. It is possible to identify the presence of common backgrounds in a dataset and identify differences in datasets for the same protein. This method is the first step in the process of completely removing such backgrounds. AVAILABILITY The tool was implemented in python. The common background set and the supplementary data are available at https://github.com/phrh/BackCLIP. CONTACT phreyes@gmail.com SUPPLEMENTARY INFORMATION Supplementary data are available at Bioinformatics online.
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Affiliation(s)
- P H Reyes-Herrera
- Colombian Corporation for Agricultural Research (CORPOICA), 250047 Bogotá, Colombia
| | | | - C A Sierra
- Universidad Antonio Nariño, 110311 Bogotá, Colombia
| | - S Herrera
- Woods Hole Oceanographic Institution, 02543 Massachusetts, USA and Massachusetts Institute of Technology, 02139 Massachusetts, USA
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