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Roca-Ferrer J, Pujols L, Pérez-González M, Alobid I, Callejas B, Vicens-Artés S, Fuentes M, Valero A, Picado C, Castor D, Nguyen D, Mullol J. Superior effect of MP-AzeFlu than azelastine or fluticasone propionate alone on reducing inflammatory markers. Allergy Asthma Clin Immunol 2018; 14:86. [PMID: 30574167 PMCID: PMC6299636 DOI: 10.1186/s13223-018-0311-4] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2018] [Accepted: 12/12/2018] [Indexed: 12/21/2022]
Abstract
BACKGROUND MP-AzeFlu, intranasal formulation of azelastine hydrochloride (AZE) and fluticasone propionate (FP), is superior to AZE or FP alone for treatment of allergic rhinitis (AR). However, the precise anti-inflammatory mechanism of action of MP-AzeFlu has not been characterized. OBJECTIVE To investigate the anti-inflammatory effects of MP-AzeFlu compared with AZE or FP alone in an established in vitro model of eosinophilic inflammation. METHODS Nasal mucosal epithelial cells and peripheral blood eosinophils were obtained from human volunteers. Epithelial cells were stimulated with 10% fetal bovine serum (FBS) in the presence of MP-AzeFlu, AZE, or FP (1:102 to 1:105 dilution). Concentrations of interleukin (IL)-6, IL-8, and granulocyte-macrophage colony-stimulating factor (GM-CSF) were measured by ELISA. Eosinophils were incubated in 10% human epithelial cell-conditioned medium (HECM) and survival assessed by trypan blue dye exclusion. Results are expressed as mean ± SEM percentage secretion/survival compared with FBS/HECM (respectively). RESULTS FP and MP-AzeFlu (all dilutions) and AZE (1:102) significantly reduced IL-6 secretion and eosinophil survival compared with positive controls. At 1:102 dilution, IL-6 secretion was significantly lower with MP-AzeFlu (38.3 ± 4.2%, compared with FBS = 100%) than with AZE (76.1 ± 4.9%) or FP (53.0 ± 4.9%). At 1:102 dilution, eosinophil survival was significantly lower with MP-AzeFlu at day 3 (17.5 ± 3.0%) and day 4 (2.4 ± 1.4%, compared with HECM = 100%) than with AZE (day 3: 75.2 ± 7.2%; day 4: 44.0 ± 9.7%) or FP (day 3: 38.5 ± 3.5%; day 4: 14.6 ± 4.0%). CONCLUSION Greater reductions in cytokine secretion and eosinophil survival observed with MP-AzeFlu in vitro may underlie MP-AzeFlu's superior clinical efficacy vs. AZE or FP alone observed in AR patients.
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Affiliation(s)
- Jordi Roca-Ferrer
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Laura Pujols
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Maria Pérez-González
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Isam Alobid
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
- Rhinology Unit & Smell Clinic, ENT Department, Hospital Clínic, Universitat de Barcelona, Villarroel 170, 08036 Barcelona, Catalonia Spain
| | - Borja Callejas
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Sònia Vicens-Artés
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Mireya Fuentes
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
| | - Antonio Valero
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
- Allergy Section, Respiratory and Allergy Department, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
| | - César Picado
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
- Allergy Section, Respiratory and Allergy Department, Hospital Clínic, Universitat de Barcelona, Barcelona, Spain
| | - Dennis Castor
- Clinical Science & Operations, Meda Pharma GmbH & Co. KG (A Mylan Company), Bad Homburg, Germany
| | - DucTung Nguyen
- Clinical Science & Operations, Meda Pharma GmbH & Co. KG (A Mylan Company), Bad Homburg, Germany
| | - Joaquim Mullol
- Clinical and Experimental Respiratory Immunoallergy, Institut d’Investigacions Biomèdiques August Pi i Sunyer (IDIBAPS), Barcelona, Spain
- Centro de Investigaciones Biomédicas en Red de Enfermedades Respiratorias (CIBERES), Madrid, Spain
- Rhinology Unit & Smell Clinic, ENT Department, Hospital Clínic, Universitat de Barcelona, Villarroel 170, 08036 Barcelona, Catalonia Spain
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Peña-Diaz J, Bregenhorn S, Ghodgaonkar M, Follonier C, Artola-Borán M, Castor D, Lopes M, Sartori AA, Jiricny J. Noncanonical Mismatch Repair as a Source of Genomic Instability in Human Cells. Mol Cell 2017; 67:162. [PMID: 28686873 DOI: 10.1016/j.molcel.2017.06.026] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Lachaud C, Slean M, Marchesi F, Lock C, Odell E, Castor D, Toth R, Rouse J. Karyomegalic interstitial nephritis and DNA damage-induced polyploidy in Fan1 nuclease-defective knock-in mice. Genes Dev 2016; 30:639-44. [PMID: 26980188 PMCID: PMC4803050 DOI: 10.1101/gad.276287.115] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
In this study, Lachaud et al. investigated the cause of karyomegalic interstitial nephritis (KIN), a form of chronic kidney disease characterized by karyomegaly. They demonstrate that mice lacking Fan1 nuclease activity recapitulate the symptoms of KIN, providing new insights into how Fan1 nuclease activity contributes to the KIN phenotype. The Fan1 endonuclease is required for repair of DNA interstrand cross-links (ICLs). Mutations in human Fan1 cause karyomegalic interstitial nephritis (KIN), but it is unclear whether defective ICL repair is responsible or whether Fan1 nuclease activity is relevant. We show that Fan1 nuclease-defective (Fan1nd/nd) mice develop a mild form of KIN. The karyomegalic nuclei from Fan1nd/nd kidneys are polyploid, and fibroblasts from Fan1nd/nd mice become polyploid upon ICL induction, suggesting that defective ICL repair causes karyomegaly. Thus, Fan1 nuclease activity promotes ICL repair in a manner that controls ploidy, a role that we show is not shared by the Fanconi anemia pathway or the Slx4–Slx1 nuclease also involved in ICL repair.
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Affiliation(s)
- Christophe Lachaud
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Meghan Slean
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Francesco Marchesi
- School of Veterinary Medicine, College of Medical, Veterinary, and Life Sciences, University of Glasgow, Glasgow G61 1QH, United Kingdom
| | - Claire Lock
- Department of Head and Neck Pathology, Guy's Hospital, London SE1 9RT, United Kingdom
| | - Edward Odell
- Department of Head and Neck Pathology, Guy's Hospital, London SE1 9RT, United Kingdom
| | - Dennis Castor
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - Rachel Toth
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, United Kingdom
| | - John Rouse
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, United Kingdom
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Gentili C, Castor D, Kaden S, Lauterbach D, Gysi M, Steigemann P, Gerlich DW, Jiricny J, Ferrari S. Chromosome Missegregation Associated with RUVBL1 Deficiency. PLoS One 2015; 10:e0133576. [PMID: 26201077 PMCID: PMC4511761 DOI: 10.1371/journal.pone.0133576] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Accepted: 06/30/2015] [Indexed: 12/31/2022] Open
Abstract
RUVBL1 (RuvB-like1) and RUVBL2 (RuvB-like 2) are integral components of multisubunit protein complexes involved in processes ranging from cellular metabolism, transcription and chromatin remodeling to DNA repair. Here, we show that although RUVBL1 and RUVBL2 are known to form heterodimeric complexes in which they stabilize each other, the subunits separate during cytokinesis. In anaphase-to-telophase transition, RUVBL1 localizes to structures of the mitotic spindle apparatus, where it partially co-localizes with polo-like kinase 1 (PLK1). The ability of PLK1 to phosphorylate RUVBL1-but not RUVBL2-in vitro and their physical association in vivo suggest that this kinase differentially regulates the function of the RuvB-like proteins during mitosis. We further show that siRNA-mediated knock-down of RuvB-like proteins causes severe defects in chromosome alignment and segregation. In addition, we show that the ATPase activity of RUVBL1 is indispensable for cell proliferation. Our data thus demonstrate that RUVBL1 is essential for efficient mitosis and proliferation.
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Affiliation(s)
- Christian Gentili
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Dennis Castor
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Svenja Kaden
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - David Lauterbach
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Mario Gysi
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Patrick Steigemann
- Institute of Biochemistry, Schafmattstrasse 18, HPM E17.2, Swiss Institute of Technology Zurich (ETHZ), CH-8093, Zurich, Switzerland
| | - Daniel W. Gerlich
- Institute of Biochemistry, Schafmattstrasse 18, HPM E17.2, Swiss Institute of Technology Zurich (ETHZ), CH-8093, Zurich, Switzerland
| | - Josef Jiricny
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Stefano Ferrari
- Institute of Molecular Cancer Research of the University of Zurich and the ETH Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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Nair N, Castor D, Macartney T, Rouse J. Identification and characterization of MUS81 point mutations that abolish interaction with the SLX4 scaffold protein. DNA Repair (Amst) 2014; 24:131-137. [PMID: 25224045 PMCID: PMC4251979 DOI: 10.1016/j.dnarep.2014.08.004] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2014] [Revised: 08/16/2014] [Accepted: 08/22/2014] [Indexed: 12/02/2022]
Abstract
MUS81-EME1 is a conserved structure-selective endonuclease with a preference for branched DNA substrates in vitro that correspond to intermediates of DNA repair. Cells lacking MUS81 or EME1 show defects in the repair of DNA interstrand crosslinks (ICL) resulting in hypersensitivity to agents such as mitomycin C. In metazoans, a proportion of cellular MUS81-EME1 binds the SLX4 scaffold protein, which is itself instrumental for ICL repair. It was previously reported that mutations in SLX4 that abolished interaction with MUS81 affected ICL repair in human cells but not in murine cells. In this study we looked the other way around by pinpointing amino acid residues in MUS81 that when mutated abolish the interaction with SLX4. These mutations fully rescued the mitomycin C hypersensitivity of MUS81 knockout murine cells, but they were unable to rescue the sensitivity of two different human cell lines defective in MUS81. These data support an SLX4-dependent role for MUS81 in the repair, but not the induction of ICL-induced double-strand breaks. This study sheds light on the extent to which MUS81 function in ICL repair requires interaction with SLX4.
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Affiliation(s)
- Nidhi Nair
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
| | - Dennis Castor
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
| | - Thomas Macartney
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
| | - John Rouse
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK.
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Lachaud C, Castor D, Hain K, Muñoz I, Wilson J, MacArtney TJ, Schindler D, Rouse J. Distinct functional roles for the two SLX4 ubiquitin-binding UBZ domains mutated in Fanconi anemia. J Cell Sci 2014; 127:2811-7. [PMID: 24794496 PMCID: PMC4075355 DOI: 10.1242/jcs.146167] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Defects in SLX4, a scaffold for DNA repair nucleases, result in Fanconi anemia (FA), due to the defective repair of inter-strand DNA crosslinks (ICLs). Some FA patients have an SLX4 deletion removing two tandem UBZ4-type ubiquitin-binding domains that are implicated in protein recruitment to sites of DNA damage. Here, we show that human SLX4 is recruited to sites of ICL induction but that the UBZ-deleted form of SLX4 in cells from FA patients is not. SLX4 recruitment does not require either the ubiquitylation of FANCD2 or the E3 ligases RNF8, RAD18 and BRCA1. We show that the first (UBZ-1) but not the second UBZ domain of SLX4 binds to ubiquitin polymers, with a preference for K63-linked chains. Furthermore, UBZ-1 is required for SLX4 recruitment to ICL sites and for efficient ICL repair in murine fibroblasts. The SLX4 UBZ-2 domain does not bind to ubiquitin in vitro or contribute to ICL repair, but it is required for the resolution of Holliday junctions in vivo. These data shed light on SLX4 recruitment, and they point to the existence of currently unidentified ubiquitylated ligands and E3 ligases that are crucial for ICL repair.
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Affiliation(s)
- Christophe Lachaud
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Dennis Castor
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Karolina Hain
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Ivan Muñoz
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Jamie Wilson
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Thomas J MacArtney
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
| | - Detlev Schindler
- Department of Human Genetics, University of Wuerzburg, Biozentrum, Wuerzburg, Germany
| | - John Rouse
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, Sir James Black Centre, University of Dundee, Dundee DD1 5EH, UK
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Castor D, Nair N, Déclais AC, Lachaud C, Toth R, Macartney TJ, Lilley DMJ, Arthur JSC, Rouse J. Cooperative control of holliday junction resolution and DNA repair by the SLX1 and MUS81-EME1 nucleases. Mol Cell 2013; 52:221-33. [PMID: 24076219 PMCID: PMC3808987 DOI: 10.1016/j.molcel.2013.08.036] [Citation(s) in RCA: 116] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2013] [Revised: 07/19/2013] [Accepted: 08/14/2013] [Indexed: 12/20/2022]
Abstract
Holliday junctions (HJs) are X-shaped DNA structures that arise during homologous recombination, which must be removed to enable chromosome segregation. The SLX1 and MUS81-EME1 nucleases can both process HJs in vitro, and they bind in close proximity on the SLX4 scaffold, hinting at possible cooperation. However, the cellular roles of mammalian SLX1 are not yet known. Here, we use mouse genetics and structure function analysis to investigate SLX1 function. Disrupting the murine Slx1 and Slx4 genes revealed that they are essential for HJ resolution in mitotic cells. Moreover, SLX1 and MUS81-EME1 act together to resolve HJs in a manner that requires tethering to SLX4. We also show that SLX1, like MUS81-EME1, is required for repair of DNA interstrand crosslinks, but this role appears to be independent of HJ cleavage, at least in mouse cells. These findings shed light on HJ resolution in mammals and on maintenance of genome stability. Resolution of Holliday junctions in mouse cells requires the SLX1 nuclease SLX1 acts cooperatively with MUS81-EME1 in HJ resolution and ICL repair Mutations in SLX4 that prevent it binding to SLX1 and MUS81-EME1 abolish HJ resolution DNA substrates of SLX1 and MUS81-EME1 in ICL repair appear to be different from HJs
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Affiliation(s)
- Dennis Castor
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
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Wilson JSJ, Tejera AM, Castor D, Toth R, Blasco MA, Rouse J. Localization-dependent and -independent roles of SLX4 in regulating telomeres. Cell Rep 2013; 4:853-60. [PMID: 23994477 PMCID: PMC3969258 DOI: 10.1016/j.celrep.2013.07.033] [Citation(s) in RCA: 69] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Revised: 07/10/2013] [Accepted: 07/25/2013] [Indexed: 10/26/2022] Open
Abstract
SLX4, a scaffold for structure-specific DNA repair nucleases, is important for several types of DNA repair. Many repair proteins bind to sites of DNA damage, resulting in subnuclear "foci," but SLX4 forms foci in human cells even without DNA damage. Using several approaches, we show that most, but not all, SLX4 foci localize to telomeres in a range of human cell lines irrespective of the mechanisms used to maintain telomere length. The SLX1 Holliday-junction-processing enzyme is recruited to telomeres by SLX4, and SLX4, in turn, is recruited by a motif that binds to the shelterin subunit TRF2 directly. We also show that TRF2-dependent recruitment of SLX4 prevents telomere damage. Furthermore, SLX4 prevents telomere lengthening and fragility in a manner that appears to be independent of telomere association. These findings reveal that SLX4 plays multiple roles in regulating telomere homeostasis.
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Affiliation(s)
- Jamie S J Wilson
- MRC Protein Phosphorylation and Ubiquitylation Unit, College of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
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Peña-Diaz J, Bregenhorn S, Ghodgaonkar M, Follonier C, Artola-Borán M, Castor D, Lopes M, Sartori AA, Jiricny J. Noncanonical mismatch repair as a source of genomic instability in human cells. Mol Cell 2012; 47:669-80. [PMID: 22864113 DOI: 10.1016/j.molcel.2012.07.006] [Citation(s) in RCA: 109] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2012] [Revised: 05/19/2012] [Accepted: 06/29/2012] [Indexed: 11/24/2022]
Abstract
Mismatch repair (MMR) is a key antimutagenic process that increases the fidelity of DNA replication and recombination. Yet genetic experiments showed that MMR is required for antibody maturation, a process during which the immunoglobulin loci of antigen-stimulated B cells undergo extensive mutagenesis and rearrangements. In an attempt to elucidate the mechanism underlying the latter events, we set out to search for conditions that compromise MMR fidelity. Here, we describe noncanonical MMR (ncMMR), a process in which the MMR pathway is activated by various DNA lesions rather than by mispairs. ncMMR is largely independent of DNA replication, lacks strand directionality, triggers PCNA monoubiquitylation, and promotes recruitment of the error-prone polymerase-η to chromatin. Importantly, ncMMR is not limited to B cells but occurs also in other cell types. Moreover, it contributes to mutagenesis induced by alkylating agents. Activation of ncMMR may therefore play a role in genomic instability and cancer.
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Affiliation(s)
- Javier Peña-Diaz
- Institute of Molecular Cancer Research, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.
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Brachner A, Braun J, Ghodgaonkar M, Castor D, Zlopaša L, Ehrlich V, Jiricny J, Gotzmann J, Knasmüller S, Foisner R. The endonuclease Ankle1 requires its LEM and GIY-YIG motifs for DNA cleavage in vivo. J Cell Sci 2012; 125:1048-57. [PMID: 22399800 PMCID: PMC4335191 DOI: 10.1242/jcs.098392] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The LEM domain (for lamina-associated polypeptide, emerin, MAN1 domain) defines a group of nuclear proteins that bind chromatin through interaction of the LEM motif with the conserved DNA crosslinking protein, barrier-to-autointegration factor (BAF). Here, we describe a LEM protein annotated in databases as 'Ankyrin repeat and LEM domain-containing protein 1' (Ankle1). We show that Ankle1 is conserved in metazoans and contains a unique C-terminal GIY-YIG motif that confers endonuclease activity in vitro and in vivo. In mammals, Ankle1 is predominantly expressed in hematopoietic tissues. Although most characterized LEM proteins are components of the inner nuclear membrane, ectopic Ankle1 shuttles between cytoplasm and nucleus. Ankle1 enriched in the nucleoplasm induces DNA cleavage and DNA damage response. This activity requires both the catalytic C-terminal GIY-YIG domain and the LEM motif, which binds chromatin via BAF. Hence, Ankle1 is an unusual LEM protein with a GIY-YIG-type endonuclease activity in higher eukaryotes.
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Affiliation(s)
- Andreas Brachner
- Max F. Perutz Laboratories, Medical University of Vienna, Dr. Bohr-Gasse 9, Vienna, Austria
| | - Juliane Braun
- Max F. Perutz Laboratories, Medical University of Vienna, Dr. Bohr-Gasse 9, Vienna, Austria
| | - Medini Ghodgaonkar
- Institute of Molecular Cancer Research, University of Zurich, Switzerland
| | - Dennis Castor
- Institute of Molecular Cancer Research, University of Zurich, Switzerland
| | - Livija Zlopaša
- Max F. Perutz Laboratories, Medical University of Vienna, Dr. Bohr-Gasse 9, Vienna, Austria
| | - Veronika Ehrlich
- Institute of Cancer Research, Inner Medicine I, Medical University of Vienna, Austria
| | - Josef Jiricny
- Institute of Molecular Cancer Research, University of Zurich, Switzerland
| | - Josef Gotzmann
- Max F. Perutz Laboratories, Medical University of Vienna, Dr. Bohr-Gasse 9, Vienna, Austria
| | - Siegfried Knasmüller
- Institute of Cancer Research, Inner Medicine I, Medical University of Vienna, Austria
| | - Roland Foisner
- Max F. Perutz Laboratories, Medical University of Vienna, Dr. Bohr-Gasse 9, Vienna, Austria
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Vettermann C, Castor D, Mekker A, Gerrits B, Karas M, Jäck HM. Proteome profiling suggests a pro-inflammatory role for plasma cells through release of high-mobility group box 1 protein. Proteomics 2011; 11:1228-37. [PMID: 21319304 DOI: 10.1002/pmic.201000491] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2010] [Revised: 11/07/2010] [Accepted: 12/13/2010] [Indexed: 02/06/2023]
Abstract
The final step of B-cell maturation is to differentiate into plasma cells, a process that is accompanied by gross changes in subcellular organization to enable antibody secretion. To better understand this critical step in mounting a humoral immune response, we analyzed proteome dynamics during plasma cell differentiation with combined 2-DE/MS. Thirty-two identified protein spots changed in relative abundance when lipopolysaccharide (LPS)-stimulated primary B cells differentiated into antibody-secreting plasma cells. A correlative analysis of protein and transcript abundance suggested that one third of these proteins are post-transcriptionally regulated. Apart from ER-resident chaperones, lipid metabolic enzymes, and translation initiation factors, we identified several proteins that had not been previously studied in plasma cells. Among them is the transiently upregulated proteasome activator (PA) 28γ, a component of the putative nuclear proteasome. Additionally, we discovered that the non-canonical inflammatory cytokine high-mobility group box 1 (HMG1) was released from plasma cells into the extracellular milieu. This suggests a novel role for plasma cells as pro-inflammatory mediators, which has important implications for various autoimmune diseases and chronic inflammation.
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Affiliation(s)
- Christian Vettermann
- Division of Molecular Immunology, Department of Internal Medicine, Nikolaus-Fiebiger-Center for Molecular Medicine, University of Erlangen-Nürnberg, Erlangen, Germany
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Jiang Y, Karita E, Castor D, Jolly PE. Characterization of CD8+ T lymphocytes in chronic HIV-1 subtype A infection in Rwandan women. Cell Mol Biol (Noisy-le-grand) 2005; 51 Suppl:OL737-43. [PMID: 16171573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2004] [Accepted: 09/09/2004] [Indexed: 05/04/2023]
Abstract
We examined CD8+ T lymphocyte characteristics in Rwandan women who have survived HIV-1 subtype A infection for 8-13 years without antiretroviral therapy. HIV-1 subtype A gag-specific IFN-gamma expressing CD8+ T lymphocytes were detectable in PBMC from 5 of 7 women and there was a strong positive association (r = 0.9262; p < 0.001) between these cells and plasma viral load. CD8+ T cells of these HIV-positive women produced more RANTES and MIP-1beta than cells from HIV-negative donors. However, extremely low levels of perforin (0.88 +/- 0.93%) were produced by CD8+ T lymphocytes from the infected women compared with HIV-negative controls (42.86 +/- 11.0%; p < 0.001). The percentages of CD8+ CD45RA+ perforin+ and CD8+ CD45RA+ CD27-lymphocytes were also much lower in the HIV-infected women compared with HIV-negative controls. Therefore, the inability of CD8+ T cells to control HIV may, in part, be dependent on insufficient generation of effectors from HIV-specific CD8+ T cells. Also, the lack of perforin in CD8+ T cells is linked with persistent CD27 expression, suggesting impaired maturation and impairment in cytolytic activity in chronic HIV-1 infection.
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Affiliation(s)
- Y Jiang
- Department of Epidemiology and International Health, School of Public Health, University of Alabama, Birmingham, AL 35294-0022, USA
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Castor D, Jolly PE, Furlonge C, Rao A, Brown A, Camara B, Weiss H, Prabhakar P. Determinants of gonorrhoea infection among STD clinic attenders in Trinidad--II: sexual behavioural factors. Int J STD AIDS 2002; 13:46-51. [PMID: 11802930 DOI: 10.1258/0956462021924479] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Sexual behavioural factors associated with gonococcal infection among 991 STD clinic attenders in Trinidad, West Indies (WI) were determined by univariate and stepwise multiple logistic regression analysis. Casual sex (odds ratios [OR] 1.6) was the only predictor of gonorrhoea. Among males, significant associations were identified by univariate analysis between concurrent partnerships, > or =one sexual partner(s) in the past 6 months, and drug use prior to engaging in casual and/or oral sex. No significant associations were identified between gonorrhoea and sexual behaviour factors among females. This study is the first to describe sexual behaviours associated with gonococcal infection in Trinidad and to evaluate risk behaviours by gender.
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Affiliation(s)
- D Castor
- School of Public Health and Medical Statistics Section, University of Alabama at Birmingham, 1665 University Boulevard, Ryals Bldg., Birmingham, AL 35294-0022, USA
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Castor D, Prabhakar P, Furlonge C, Rao A, Brown A, Camara B, Weiss H, Jolly PE. Determinants of gonorrhoea infection among STD clinic attenders in Trinidad--I: sociodemographic factors, knowledge, risk perception and history of STD. Int J STD AIDS 2002; 13:39-45. [PMID: 11802929 DOI: 10.1258/0956462021924604] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
We determined the prevalence of Neisseria gonorrhoeae and describe sociodemographic factors, knowledge and sexually transmitted disease (STD) history associated with gonococcal infection among 991 STD clinic attenders in Trinidad, West Indies (WI). The prevalence of gonorrhoea was 25%. Predictors for gonorrhoea were: male gender (odds ratios [OR] 3.5), age 15-19 (OR 2.5) and 20-29 years (OR 2.1), unawareness of the term STD (OR 1.5), self-perceived risk for STDs (OR 1.7) and no history of syphilis (OR 2.0). When the data were analysed by gender, significant associations were identified between gonococcal infection and age <30 years, single status, and self-perceived risk for STDs for males. Among females, significant associations existed between gonorrhoea and age <30 years, and unawareness of the term STD. This study is novel in describing sociodemographic characteristics of STD clinic attenders, and risk markers associated with gonococcal infection in Trinidad.
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Affiliation(s)
- D Castor
- School of Public Health and Medical Statistics Section, University of Alabama at Birmingham, 1665 University Boulevard, Ryals Bldg., Birmingham, AL 35294-0022, USA.
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Castor D, Prabhakar P, Furlonge C, Rao A, Brown A, Camara B, Weiss H, Jolly PE. Antibiotic resistant N. gonorrhoeae in Trinidad and Tobago. Cell Mol Biol (Noisy-le-grand) 2001; 47:987-95. [PMID: 11785665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
We tested the susceptibility patterns of 128 N. gonorrhoeae isolates to six antimicrobials; penicillin, tetracycline, spectinomycin, ceftriaxone, ciprofloxacin and azithromycin, and examined whether certain demographic or behavioral factors related to antibiotic use increased the likelihood of infection by a resistant strain. There was a low rate of resistance to penicillin; penicillinase-producing and chromosomal-mediated penicillin resistant gonorrhea were estimated to be 0.8%. A much higher proportion of isolates were resistant to tetracycline (up to 15%). All isolates were sensitive to spectinomycin, ciprofloxacin and ceftriaxone. However, less than 2% of isolates displayed intermediate resistance to both ciprofloxacin and ceftriaxone, and 9% exhibited intermediate resistance to spectinomycin. Patients who had obtained medication before attending the clinic and had taken all of the medication were more likely (p = 0.03) to be infected with a resistant strain of gonococcus. Also, patients who were asked by a clinic doctor to return for a test of cure during an earlier clinic visit, but who did not return were more likely to be infected with a resistant organism (p = 0.006) compared to those who returned at the doctor's request. These findings have important implications for antibiotic use and educational programs in Trinidad and Tobago.
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Affiliation(s)
- D Castor
- Department of Epidemiology and International Health, School of Public Health and Medical Statistics Section, University of Alabama at Birmingham, 35294-0022, USA
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