1
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Albogami S, Todd I, Negm O, Fairclough LC, Tighe PJ. Mutations in the binding site of TNFR1 PLAD reduce homologous interactions but can enhance antagonism of wild-type TNFR1 activity. Immunology 2021; 164:637-654. [PMID: 34363702 DOI: 10.1111/imm.13400] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Revised: 07/05/2021] [Accepted: 07/12/2021] [Indexed: 11/29/2022] Open
Abstract
The tumour necrosis factor receptor superfamily (TNFRSF) members contain cysteine-rich domains (CRD) in their extracellular regions, and the membrane-distal CRD1 forms homologous interactions in the absence of ligand. The CRD1 is therefore termed a pre-ligand assembly domain (PLAD). The role of PLAD-PLAD interactions in the induction of signalling as a consequence of TNF-TNFR binding led to the development of soluble PLAD domains as antagonists of TNFR activation. In the present study, we generated recombinant wild-type (WT) PLAD of TNFR1 and mutant forms with single alanine substitutions of amino acid residues thought to be critical for the formation of homologous dimers and/or trimers of PLAD (K19A, T31A, D49A and D52A). These mutated PLADs were compared with WT PLAD as antagonists of TNF-induced apoptosis or the activation of inflammatory signalling pathways. Unlike WT PLAD, the mutated PLADs showed little or no homologous interactions, confirming the importance of particular amino acids as contact residues in the PLAD binding region. However, as with WT PLAD, the mutated PLADs functioned as antagonists of TNF-induced TNFR1 activity leading to induction of cell death or NF-κB signalling. Indeed, some of the mutant PLADs, and K19A PLAD in particular, showed enhanced antagonistic activity compared with WT PLAD. This is consistent with the reduced formation of homologous multimers by these PLAD mutants effectively increasing the concentration of PLAD available to bind and antagonize WT TNFR1 when compared to WT PLAD acting as an antagonist. This may have implications for the development of antagonistic PLADs as therapeutic agents.
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Affiliation(s)
- Sarah Albogami
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Department of Biotechnology, School of Science, Taif University, Taif, Saudi Arabia
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Ola Negm
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | | | - Patrick J Tighe
- School of Life Sciences, University of Nottingham, Nottingham, UK
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2
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Hamed A, Todd I, Tighe PJ, Powell RJ, Harrison T, Fairclough LC. Array-based measurements of aero-allergen-specific IgE correlate with skin-prick test reactivity in asthma regardless of specific IgG4 or total IgE measurements. J Immunol Methods 2021; 492:112999. [PMID: 33609533 DOI: 10.1016/j.jim.2021.112999] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2020] [Revised: 11/28/2020] [Accepted: 02/10/2021] [Indexed: 10/22/2022]
Abstract
Skin prick testing (SPT) and measurement of serum allergen-specific IgE (sIgE) are used to investigate asthma and other allergic conditions. Measurement of serum total IgE (tIgE) and allergen-specific IgG4 (sIgG4) may also be useful. The aim was to ascertain the correlation between these serological parameters and SPT. Sera from 60 suspected asthmatic patients and 18 healthy controls were assayed for sIgE and sIgG4 reactivity against a panel of 70 SPT allergen preparations, and for tIgE. The patients were also assessed by skin prick tests for reactivity to cat, dog, house dust mite and grass allergens. Over 50% of the patients had tIgE levels above the 75th percentile of the controls. 58% of patients and 39% of controls showed sIgE reactivity to ≥1 allergen. The mean number of allergens detected by sIgE was 3.1 in suspected asthma patients and 0.9 in controls. 58% of patients and 50% of controls showed sIgG4 reactivity to ≥1 allergen. The mean number of allergens detected by sIgG4 was 2.5 in patients and 1.7 in controls. For the patients, a strong correlation was observed between clinical SPT reactivity and serum sIgE levels to cat, dog, house dust mite (HDM) and grass allergens. SPT correlations using sIgE/sIgG4 or sIgE/tIgE ratios were not markedly higher. The measurement of serum sIgE by microarray using SPT allergen preparations showed good correlation with clinical SPT reactivity to cat, dog, HDM and grass allergens. This concordance was not improved by measuring tIgE or sIgG4.
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Affiliation(s)
- Aljali Hamed
- School of Life Sciences, The University of Nottingham, Nottingham NG7 2UH, UK; Department of Laboratory Medicine, Faculty of Medical Technology, Omar Al-Mukhtar University, Al Bayda City, Libya
| | - Ian Todd
- School of Life Sciences, The University of Nottingham, Nottingham NG7 2UH, UK
| | - Patrick J Tighe
- School of Life Sciences, The University of Nottingham, Nottingham NG7 2UH, UK
| | - Richard J Powell
- School of Life Sciences, The University of Nottingham, Nottingham NG7 2UH, UK
| | - Tim Harrison
- School of Medicine, Division of Respiratory Medicine, Clinical Sciences Building, City Hospital Campus, University of Nottingham, Nottingham NG5 1PB, UK
| | - Lucy C Fairclough
- School of Life Sciences, The University of Nottingham, Nottingham NG7 2UH, UK.
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3
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Todd I, Thomas RE, Watt BD, Sutherland L, Afriyie-Asante A, Deb B, Joseph B, Tighe PJ, Lanyon P, Fairclough LC. Multiple pathways of type 1 interferon production in lupus: the case for amlexanox. Rheumatology (Oxford) 2020; 59:3980-3982. [PMID: 32888016 DOI: 10.1093/rheumatology/keaa469] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 06/04/2020] [Accepted: 06/17/2020] [Indexed: 11/13/2022] Open
Affiliation(s)
- Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Nottingham Biomedical Research Centre (Musculoskeletal)
| | - Rhema E Thomas
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Baltina D Watt
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Lissa Sutherland
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | | | - Bishnu Deb
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Blessy Joseph
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Patrick J Tighe
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Nottingham Biomedical Research Centre (Musculoskeletal)
| | - Peter Lanyon
- Nottingham Biomedical Research Centre (Musculoskeletal).,Department of Rheumatology, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Lucy C Fairclough
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Nottingham Biomedical Research Centre (Musculoskeletal)
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4
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Abstract
We report a case of hypersensitivity pneumonitis (HP) in a young person secondary to vaping. He presented with a putative diagnosis of asthma and required extracorporeal membrane oxygenationbecause of intractable respiratory failure. He developed a critical illness and steroid myopathy and required prolonged rehabilitation. Our patient fulfils diagnostic criteria for HP secondary to e-cigarettes with a positive exposure history, deterioration after skin prick testing, specific serum IgM antibodies against the implicated liquid raising the possibility that the relevant antigen was present in that liquid and radiological and histopathological features compatible with acute HP. There are two learning points. The first is always to consider a reaction to e-cigarettes in someone presenting with an atypical respiratory illness. The second is that we consider e-cigarettes as 'much safer than tobacco' at our peril.
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Affiliation(s)
- Nisha Nair
- Paediatric Therapy Department, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Matthew Hurley
- Department of Paediatric Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Simon Gates
- Paediatric Therapy Department, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - Patrick Davies
- Department of Paediatric Critical Care, Nottingham University Hospitals NHS Trust, Nottingham, UK
| | - I-Ling Chen
- Academic Immunology, School of Life Sciences, University of Nottingham Faculty of Medicine and Health Sciences, Nottingham, UK
| | - Ian Todd
- Academic Immunology, School of Life Sciences, University of Nottingham Faculty of Medicine and Health Sciences, Nottingham, UK
| | - Lucy Fairclough
- Academic Immunology, School of Life Sciences, University of Nottingham Faculty of Medicine and Health Sciences, Nottingham, UK
| | - Andrew Bush
- Paediatrics and Paediatric Respirology, National Heart and Lung Institute, Royal Brompton and Harefield NHS Foundation Trust, London, UK
| | - Jayesh Mahendra Bhatt
- Department of Paediatric Respiratory Medicine, Nottingham University Hospitals NHS Trust, Nottingham, UK
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5
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Williams M, Todd I, Fairclough LC. The role of CD8 + T lymphocytes in chronic obstructive pulmonary disease: a systematic review. Inflamm Res 2020; 70:11-18. [PMID: 33037881 PMCID: PMC7806561 DOI: 10.1007/s00011-020-01408-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [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: 05/22/2020] [Revised: 09/23/2020] [Accepted: 10/01/2020] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE AND DESIGN This systematic review aims to establish the role of CD8 + T lymphocytes in COPD. METHODS Forty-eight papers published in the last 15 years were identified for inclusion. RESULTS CD8 + T-cells are increased in the lungs of patients with COPD (17 studies, 16 positive) whereas in the circulation, findings were inconclusive. Activation of CD8 + T-cells was enhanced in lungs (four studies, three positive) but cell phenotype was unclear. There was substantial evidence of a higher proportion of type 1 CD8 + (Tc1) cells in COPD (11 studies, 9 positive), though the population of type 2 (Tc2) cells was also increased (5 studies, 4 positive). CD8 + T-cells in COPD exhibited greater expression of cytotoxic proteins (five studies, five positive). Studies assessed a variety of questions so evidence was insufficient to draw firm conclusions. The role of CD8 + T-cells at acute exacerbation of COPD and also their contribution to alveolar destruction can only be hypothesised at this stage. CONCLUSIONS Not only is the number of CD8 + T-cells increased in COPD, these cells have increased capacity to exert effector functions and are likely to contribute to disease pathogenesis. Several mechanisms highlighted show promise for future investigation to consolidate current knowledge.
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Affiliation(s)
- Maya Williams
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK
| | - Ian Todd
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK
| | - Lucy C Fairclough
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK.
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6
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Sangaphunchai P, Todd I, Fairclough LC. Extracellular vesicles and asthma: A review of the literature. Clin Exp Allergy 2020; 50:291-307. [PMID: 31925972 DOI: 10.1111/cea.13562] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Revised: 12/22/2019] [Accepted: 12/28/2019] [Indexed: 12/12/2022]
Abstract
Asthma is a chronic, recurrent and incurable allergy-related respiratory disease characterized by inflammation, bronchial hyperresponsiveness and narrowing of the airways. Extracellular vesicles (EVs) are a universal feature of cellular function and can be detected in different bodily fluids. Recent evidence has shown the possibility of using EVs in understanding the pathogenesis of asthma, including their potential as diagnostic and therapeutic tools. Studies have reported that EVs released from key cells involved in asthma can induce priming and activation of other asthma-associated cells. A literature review was conducted on all current research regarding the role and function of EVs in the pathogenesis of asthma via the PRISMA statement method. An electronic search was performed using EMBASE and PubMed through to November 2018. The EMBASE search returned 76 papers, while the PubMed search returned 211 papers. Following duplicate removal, titles and abstracts were screened for eligibility with a total of 34 studies included in the final qualitative analysis. The review found evidence of association between the presence of EVs and physiological changes characteristic of asthma, suggesting that EVs are involved in the pathogenesis, with the weight of evidence presently favouring deleterious effects of EVs in asthma. Numerous studies highlighted differences in exosomal contents between EVs of healthy and asthmatic individuals, which could be employed as potential diagnostic markers. In some circumstances, EVs were also found to be suppressive to disease, but more often promote inflammation and airway remodelling. In conclusion, EVs hold immense potential in understanding the pathophysiology of asthma, and as diagnostic and therapeutic markers. While more research is needed for definitive conclusions and their application in medical practice, the literature presented in this review should encourage further research and discovery within the field of EVs and asthma.
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Affiliation(s)
| | - Ian Todd
- School of Life Sciences, The University of Nottingham, Nottingham, UK
| | - Lucy C Fairclough
- School of Life Sciences, The University of Nottingham, Nottingham, UK
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7
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Velasco-Castro M, Hernández-Nava E, Figueroa IA, Todd I, Goodall R. The effect of oxygen pickup during selective laser melting on the microstructure and mechanical properties of Ti-6Al-4V lattices. Heliyon 2019; 5:e02813. [PMID: 31872099 PMCID: PMC6911884 DOI: 10.1016/j.heliyon.2019.e02813] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [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: 07/11/2018] [Revised: 11/19/2018] [Accepted: 11/07/2019] [Indexed: 11/29/2022] Open
Abstract
Additive manufacturing techniques such as Selective Laser Melting (SLM) can produce complex shapes with relatively thin sections and fine detail. However, common materials for the process, such as Ti–6Al–4V, have microstructure and properties that are sensitive to the pickup of interstitial impurities, such as oxygen, which the material will be exposed to during the process. This problem would be especially severe for parts with thin sections, where surface effects can be more significant, and where poor properties may coincide with locally-elevated stress. Here we explore the effects of oxygen level in thin sections with the use of lattice materials (materials which can be considered to consist exclusively of near-surface material). Oxygen levels are artificially raised using repeated melting passes to result in more pickup, leading to significantly reduced ductility and hence reduced strength measured in compression. A ductile to brittle transition in strut failure mechanism is found with increasing number of melting passes, with significant modification in chemistry and crystallographic structure, despite the presence of a similar fine plate-like microstructure throughout.
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Affiliation(s)
- M Velasco-Castro
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Cd. Universitaria, México, DF, C.P. 04510, Mexico
| | - E Hernández-Nava
- Department of Material Science & Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, Sheffield, S13 JD, UK
| | - I A Figueroa
- Instituto de Investigaciones en Materiales, Universidad Nacional Autónoma de México, Circuito Exterior S/N, Cd. Universitaria, México, DF, C.P. 04510, Mexico
| | - I Todd
- Department of Material Science & Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, Sheffield, S13 JD, UK
| | - R Goodall
- Department of Material Science & Engineering, The University of Sheffield, Sir Robert Hadfield Building, Mappin St, Sheffield, S13 JD, UK
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8
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Tarbiah N, Todd I, Tighe PJ, Fairclough LC. Cigarette smoking differentially affects immunoglobulin class levels in serum and saliva: An investigation and review. Basic Clin Pharmacol Toxicol 2019; 125:474-483. [PMID: 31219219 DOI: 10.1111/bcpt.13278] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [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: 05/09/2019] [Accepted: 06/16/2019] [Indexed: 12/18/2022]
Abstract
The aim of the present study was to compare concentrations of IgG, IgA, IgM and IgD in both serum and saliva samples from smoking and non-smoking individuals using a protein microarray assay. The findings were also compared to previous studies. Serum and saliva were collected from 48 smoking male individuals and 48 age-matched never-smoker male individuals. The protein microarray assays for detection of human IgG, IgM, IgA and IgD were established and optimized using Ig class-specific affinity-purified goat anti-human Ig-Fc capture antibodies and horseradish peroxidase (HRP)-conjugated goat anti-human Ig-Fc detection antibodies. The Ig class specificity of the microarray assays was verified, and the optimal dilutions of serum and saliva samples were determined for quantification of Ig levels against standard curves. We found that smoking is associated with reduced IgG concentrations and enhanced IgA concentrations in both serum and saliva. By contrast, smoking differentially affected IgM concentrations-causing increased concentrations in serum, but decreased concentrations in saliva. Smoking was associated with decreased IgD concentrations in serum and did not have a significant effect on the very low IgD concentrations in saliva. Thus, cigarette smoking differentially affects the levels of Ig classes systemically and in the oral mucosa. Although there is variation between the results of different published studies, there is a consensus that smokers have significantly reduced levels of IgG in both serum and saliva. A functional antibody deficiency associated with smoking may compromise the body's response to infection and result in a predisposition to the development of autoimmunity.
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Affiliation(s)
- Nesrin Tarbiah
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Patrick J Tighe
- School of Life Sciences, University of Nottingham, Nottingham, UK
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9
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Negm OH, Singh S, Abduljabbar W, Hamed MR, Radford P, McDermott EM, Drewe E, Fairclough L, Todd I, Tighe PJ. Patients with tumour necrosis factor (TNF) receptor-associated periodic syndrome (TRAPS) are hypersensitive to Toll-like receptor 9 stimulation. Clin Exp Immunol 2019; 197:352-360. [PMID: 31009059 DOI: 10.1111/cei.13306] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2019] [Indexed: 12/27/2022] Open
Abstract
Tumour necrosis factor receptor-associated periodic syndrome (TRAPS) is a hereditary autoinflammatory disorder characterized by recurrent episodes of fever and inflammation. It is associated with autosomal dominant mutations in TNFRSF1A, which encodes tumour necrosis factor receptor 1 (TNF-R1). Our aim was to understand the influence of TRAPS mutations on the response to stimulation of the pattern recognition Toll-like receptor (TLR)-9. Peripheral blood mononuclear cells (PBMCs) and serum were isolated from TRAPS patients and healthy controls: serum levels of 15 proinflammatory cytokines were measured to assess the initial inflammatory status. Interleukin (IL)-1β, IL-6, IL-8, IL-17, IL-22, tumour necrosis factor (TNF)-α, vascular endothelial growth factor (VEGF), interferon (IFN)-γ, monocyte chemoattractant protein 1 (MCP-1) and transforming growth factor (TGF)-β were significantly elevated in TRAPS patients' sera, consistent with constitutive inflammation. Stimulation of PBMCs with TLR-9 ligand (ODN2006) triggered significantly greater up-regulation of proinflammatory signalling intermediates [TNF receptor-associated factor (TRAF 3), IL-1 receptor-associated kinase-like 2 (IRAK2), Toll interacting protein (TOLLIP), TRAF6, phosphorylated transforming growth factor-β-activated kinase 1 (pTAK), transforming growth factor-β-activated kinase-binding protein 2 (TAB2), phosphorylated TAK 2 (pTAB2), IFN-regulatory factor 7 (IRF7), receptor interacting protein (RIP), nuclear factor kappa B (NF-κB) p65, phosphorylated NF-κB p65 (pNF-κB p65) and mitogen-activated protein kinase kinase (MEK1/2)] in TRAPS patients' PBMCs. This up-regulation of proinflammatory signalling intermediates and raised serum cytokines occurred despite concurrent anakinra treatment and no overt clinical symptoms at time of sampling. These novel findings further demonstrate the wide-ranging nature of the dysregulation of innate immune responses underlying the pathology of TRAPS and highlights the need for novel pathway-specific therapeutic treatments for this disease.
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Affiliation(s)
- O H Negm
- School of Medicine, Queen's Medical Centre, University of Nottingham, Nottingham, UK.,Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - S Singh
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - W Abduljabbar
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - M R Hamed
- School of Medicine, Queen's Medical Centre, University of Nottingham, Nottingham, UK.,Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - P Radford
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - E M McDermott
- Nottingham University Hospitals National Health Service Trust, Queen's Medical Centre Campus, Nottingham, UK
| | - E Drewe
- Nottingham University Hospitals National Health Service Trust, Queen's Medical Centre Campus, Nottingham, UK
| | - L Fairclough
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - I Todd
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
| | - P J Tighe
- Immunology, School of Life Sciences, University of Nottingham, Nottingham, UK
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10
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Chen IL, Todd I, Fairclough LC. Immunological and pathological effects of electronic cigarettes. Basic Clin Pharmacol Toxicol 2019; 125:237-252. [PMID: 30861614 DOI: 10.1111/bcpt.13225] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2018] [Accepted: 03/04/2019] [Indexed: 12/12/2022]
Abstract
Electronic cigarettes (E-cigarettes) are considered a preferable alternative to conventional cigarettes due to the lack of combustion and the absence of tobacco-specific toxicants. E-cigarettes have rapidly gained in popularity in recent years amongst both existing smokers and previous non-smokers. However, a growing literature demonstrates that E-cigarettes are not as safe as generally believed. Here, we discuss the immunological, and other, deleterious effects of E-cigarettes on a variety of cell types and host defence mechanisms in humans and in murine models. We review not only the effects of complete E-cigarette liquids, but also each of the main components-nicotine, humectants and flavourings. This MiniReview thus highlights the possible role of E-cigarettes in the pathogenesis of disease and raises awareness of the potential harm that E-cigarettes may cause.
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Affiliation(s)
- I-Ling Chen
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
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11
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Holmes J, Fairclough LC, Todd I. Atopic dermatitis and autoimmunity: the occurrence of autoantibodies and their association with disease severity. Arch Dermatol Res 2019; 311:141-162. [PMID: 30798353 PMCID: PMC7192884 DOI: 10.1007/s00403-019-01890-4] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [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: 07/03/2018] [Revised: 12/05/2018] [Accepted: 02/09/2019] [Indexed: 12/20/2022]
Abstract
Atopic dermatitis (AD) is a widespread condition that appears to be increasing in prevalence and severity worldwide, yet the underlying mechanisms are not well understood. Recent research has identified various similarities between AD and autoimmune conditions, as well as indicating that there may be an association between AD and autoimmunity. This systematic review evaluates the association between AD and autoimmunity, as well as between severity of disease in AD and autoimmunity, with an emphasis on the associations with autoantibodies. MEDLINE (1946 to December 2017) and Embase (1974 to December 2017) databases were searched. Further relevant articles were retrieved from reference lists. Only studies measuring direct indicators of autoimmunity, in humans, were included. Qualitative analysis was carried out for all studies. In addition, quantitative analysis was used to evaluate prevalence of IgE autoantibodies and anti-nuclear antibodies (ANAs) in AD patients and control subjects. The Mantel-Haenszel method was used with a random-effects model. 28 studies assessed the occurrence of autoantibodies in AD patients and 16 studies were used to evaluate association between disease severity and autoantibodies. Pooled analysis from 14 studies, involving 986 AD patients and 441 control subjects, showed that IgE autoantibodies were significantly more prevalent in patients with AD (P < 0.00001) than control subjects. Similar analysis was carried out for ANAs, with eight studies that involved 1045 AD patients and 1273 control subjects. ANAs were significantly more prevalent in patients with AD (P = 0.003). This quantitative analysis supported an association between AD and IgE autoantibodies, as well as between AD and ANAs. There was insufficient data to make similar conclusions for other indicators of autoimmunity. The weight of evidence also suggests an association between IgE autoantibodies and disease severity. There was insufficient evidence to make this link for other indicators of autoimmunity.
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Affiliation(s)
- James Holmes
- School of Life Sciences, University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK
| | - Lucy C Fairclough
- School of Life Sciences, University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Life Sciences Building, University Park, Nottingham, NG7 2RD, UK.
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12
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Hernández-Nava E, Mahoney P, Smith CJ, Donoghue J, Todd I, Tammas-Williams S. Additive manufacturing titanium components with isotropic or graded properties by hybrid electron beam melting/hot isostatic pressing powder processing. Sci Rep 2019; 9:4070. [PMID: 30858554 PMCID: PMC6411771 DOI: 10.1038/s41598-019-40722-3] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 02/20/2019] [Indexed: 11/18/2022] Open
Abstract
A methodology has been demonstrated to consolidate Ti-6Al-4V powder without taking it to the liquid state by novel combination of the electron beam melting additive manufacture and hot isostatic pressing processes. This results in improved static mechanical properties (both strength and yield) in comparison to standard EBM processed material. In addition, the ability to generate microstructurally graded components has been demonstrated by generating a component with a significant change in both microstructure and mechanical properties. This is revealed by the use of electron backscattered diffraction and micro hardness testing to produce maps showing a clear distinction between materials consolidated in different ways. The variation in microstructure and mechanical properties is attributed to the different thermal history experienced by the material at different locations. In particular, it is found that the rapid cooling experienced during EBM leads to a typical fine α lath structure, whereas a more equiaxed α grains generated by diffusion is found in HIP consolidated powder.
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Affiliation(s)
- E Hernández-Nava
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK.
| | - P Mahoney
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK
| | - C J Smith
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK
| | - J Donoghue
- School of Materials, University of Manchester, Manchester, M13 9PL, UK
| | - I Todd
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK
| | - S Tammas-Williams
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK.,Department of Maritime and Mechanical Engineering, Liverpool John Moores University, Liverpool, L3 3AF, UK
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13
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Corre LJ, Hotham E, Tsimbinos J, Todd I, Scarlett G, Suppiah V. Assessment of patient understanding of their medicines: interviews with community dwelling older Australians. International Journal of Pharmacy Practice 2018; 26:568-572. [DOI: 10.1111/ijpp.12466] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2017] [Accepted: 06/01/2018] [Indexed: 11/28/2022]
Abstract
Abstract
Objective
To identify patterns of medication load, client’s care team, coordination of healthcare and clients’ understanding of their medications.
Methods
Face-to-face interviews were conducted with community-dwelling older Australians between June and August 2017 in three community pharmacies in Adelaide, South Australia.
Key findings
Forty interviews were conducted. On average, participants were taking 7.53 medicines with 77.5% using five or more regularly. Lack of collaboration between healthcare professionals, need for increased communication between prescribers and increased patient education on medicines, were highlighted. This study demonstrates that polypharmacy and inappropriate prescribing are occurring within the community pharmacy setting, but shows insight into how these concerns can be overcome, by implementing pharmacist-led services such as non-dispensing pharmacists in community pharmacies.
Conclusion
Careful consideration when prescribing and effective communication are required to minimise risks associated with polypharmacy in this population.
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Affiliation(s)
- Lauren J Corre
- School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA, Australia
| | - Elizabeth Hotham
- School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA, Australia
| | | | - Ian Todd
- Pharmacy Guild of Australia, South Australian Branch, Adelaide, SA, Australia
| | | | - Vijayaprakash Suppiah
- School of Pharmacy and Medical Sciences, Sansom Institute for Health Research, University of South Australia, Adelaide, SA, Australia
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Abstract
Antibiotics have previously demonstrated anti-inflammatory properties, and they have been linked to therapeutic benefit in several pulmonary conditions that feature inflammation. Previous research suggests that these anti-inflammatory properties may be beneficial in the treatment of COPD. This review assesses the potential benefit of prophylactic, long-term, and low-dose antibiotic therapy in COPD, and whether any effects seen are anti-inflammatory in nature. Randomized, controlled trials comparing antibiotic therapy with placebo in subjects with stable COPD were evaluated. Twelve trials involving 3,784 participants and a range of antibiotics were included: azithromycin (6 studies, 1,972 participants), clarithromycin (1 study, 67 participants), erythromycin (3 studies, 254 participants), roxithromycin (1 study, 191 participants), and moxifloxacin (2 studies, 1,198 participants). In vitro, in vivo, and ex vivo experimental study designs exploring the mechanisms via which antibiotics may act in subjects with stable COPD were evaluated. Azithromycin and erythromycin showed the greatest effect in subjects with COPD, with evidence suggesting improvement in exacerbation-related outcomes and health status, as measured by the St George Respiratory Questionnaire. An increase in antibiotic resistance was reported in 2 studies. The macrolide class of antibiotics exhibited convincing anti-inflammatory properties with relevance to COPD, implicating several pathways as potential mechanisms of action. In conclusion, the therapeutic benefit of macrolide antibiotics in subjects with stable COPD is consistent with anti-inflammatory properties, and macrolides should be considered as a potential therapy in COPD. Safety concerns regarding antibiotic resistance need to be addressed before widespread use in clinical practice.
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Affiliation(s)
- Anthony W Huckle
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | | | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
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15
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Ayling K, Fairclough L, Tighe P, Todd I, Halliday V, Garibaldi J, Royal S, Hamed A, Buchanan H, Vedhara K. Positive mood on the day of influenza vaccination predicts vaccine effectiveness: A prospective observational cohort study. Brain Behav Immun 2018; 67:314-323. [PMID: 28923405 DOI: 10.1016/j.bbi.2017.09.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2017] [Revised: 08/31/2017] [Accepted: 09/14/2017] [Indexed: 11/28/2022] Open
Abstract
Influenza vaccination is estimated to only be effective in 17-53% of older adults. Multiple patient behaviors and psychological factors have been shown to act as 'immune modulators' sufficient to influence vaccination outcomes. However, the relative importance of such factors is unknown as they have typically been examined in isolation. The objective of the present study was to explore the effects of multiple behavioral (physical activity, nutrition, sleep) and psychological influences (stress, positive mood, negative mood) on the effectiveness of the immune response to influenza vaccination in the elderly. A prospective, diary-based longitudinal observational cohort study was conducted. One hundred and thirty-eight community-dwelling older adults (65-85years) who received the 2014/15 influenza vaccination completed repeated psycho-behavioral measures over the two weeks prior, and four weeks following influenza vaccination. IgG responses to vaccination were measured via antigen microarray and seroprotection via hemagglutination inhibition assays at 4 and 16weeks post-vaccination. High pre-vaccination seroprotection levels were observed for H3N2 and B viral strains. Positive mood on the day of vaccination was a significant predictor of H1N1 seroprotection at 16weeks post-vaccination and IgG responses to vaccination at 4 and 16weeks post-vaccination, controlling for age and gender. Positive mood across the 6-week observation period was also significantly associated with post-vaccination H1N1 seroprotection and IgG responses to vaccination at 16weeks post-vaccination, but in regression models the proportion of variance explained was lower than for positive mood on the day of vaccination alone. No other factors were found to significantly predict antibody responses to vaccination. Greater positive mood in older adults, particularly on the day of vaccination, is associated with enhanced responses to vaccination.
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Affiliation(s)
- Kieran Ayling
- Division of Primary Care, School of Medicine, Tower Building, University of Nottingham, Nottingham NG7 2RD, UK.
| | - Lucy Fairclough
- School of Life Sciences, Life Sciences Building, University of Nottingham, Nottingham NG7 2RD, UK
| | - Paddy Tighe
- School of Life Sciences, Life Sciences Building, University of Nottingham, Nottingham NG7 2RD, UK
| | - Ian Todd
- School of Life Sciences, Life Sciences Building, University of Nottingham, Nottingham NG7 2RD, UK
| | - Vanessa Halliday
- Section of Public Health, School of Health and Related Research (ScHARR), University of Sheffield, Sheffield S1 4DA, UK
| | - Jon Garibaldi
- School of Computer Science, University of Nottingham, NG8 1BB, UK
| | - Simon Royal
- Cripps Health Centre University of Nottingham, Nottingham NG7 2QW, UK
| | - Aljali Hamed
- School of Life Sciences, Life Sciences Building, University of Nottingham, Nottingham NG7 2RD, UK
| | - Heather Buchanan
- Division of Rehabilitation & Aging, School of Medicine, University of Nottingham, Queen's Medical Centre, NG7 2UH, UK
| | - Kavita Vedhara
- Division of Primary Care, School of Medicine, Tower Building, University of Nottingham, Nottingham NG7 2RD, UK.
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16
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Shindi R, Almehairi A, Negm OH, Kalsheker N, Gale NS, Shale DJ, Harrison TW, Bolton CE, John M, Todd I, Tighe PJ, Fairclough LC. Autoantibodies of IgM and IgG classes show differences in recognition of multiple autoantigens in chronic obstructive pulmonary disease. Clin Immunol 2017; 183:344-353. [DOI: 10.1016/j.clim.2017.09.020] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 07/10/2017] [Accepted: 09/22/2017] [Indexed: 12/22/2022]
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17
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Affiliation(s)
| | - Ian Todd
- South Strathclyde Raptor Study Group, Ayrshire, UK
| | - Staffan Roos
- RSPB Centre for Conservation Science, RSPB Scotland, Edinburgh, UK
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18
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Todd I, Negm OH, Reps J, Radford P, Figueredo G, McDermott EM, Drewe E, Powell RJ, Bainbridge S, Hamed M, Crouch S, Garibaldi J, St-Gallay S, Fairclough LC, Tighe PJ. A signalome screening approach in the autoinflammatory disease TNF receptor associated periodic syndrome (TRAPS) highlights the anti-inflammatory properties of drugs for repurposing. Pharmacol Res 2017; 125:188-200. [PMID: 28860008 DOI: 10.1016/j.phrs.2017.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2017] [Revised: 08/10/2017] [Accepted: 08/22/2017] [Indexed: 12/26/2022]
Abstract
TNF receptor associated periodic syndrome (TRAPS) is an autoinflammatory disease caused by mutations in TNF Receptor 1 (TNFR1). Current therapies for TRAPS are limited and do not target the pro-inflammatory signalling pathways that are central to the disease mechanism. Our aim was to identify drugs for repurposing as anti-inflammatories based on their ability to down-regulate molecules associated with inflammatory signalling pathways that are activated in TRAPS. This was achieved using rigorously optimized, high through-put cell culture and reverse phase protein microarray systems to screen compounds for their effects on the TRAPS-associated inflammatory signalome. 1360 approved, publically available, pharmacologically active substances were investigated for their effects on 40 signalling molecules associated with pro-inflammatory signalling pathways that are constitutively upregulated in TRAPS. The drugs were screened at four 10-fold concentrations on cell lines expressing both wild-type (WT) TNFR1 and TRAPS-associated C33Y mutant TNFR1, or WT TNFR1 alone; signalling molecule levels were then determined in cell lysates by the reverse-phase protein microarray. A novel mathematical methodology was developed to rank the compounds for their ability to reduce the expression of signalling molecules in the C33Y-TNFR1 transfectants towards the level seen in the WT-TNFR1 transfectants. Seven high-ranking drugs were selected and tested by RPPA for effects on the same 40 signalling molecules in lysates of peripheral blood mononuclear cells (PBMCs) from C33Y-TRAPS patients compared to PBMCs from normal controls. The fluoroquinolone antibiotic lomefloxacin, as well as others from this class of compounds, showed the most significant effects on multiple pro-inflammatory signalling pathways that are constitutively activated in TRAPS; lomefloxacin dose-dependently significantly reduced expression of 7/40 signalling molecules across the Jak/Stat, MAPK, NF-κB and PI3K/AKT pathways. This study demonstrates the power of signalome screening for identifying candidates for drug repurposing.
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Affiliation(s)
- Ian Todd
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
| | - Ola H Negm
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK; Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Egypt
| | - Jenna Reps
- Advanced Data Analysis Centre, School of Computer Science, The University of Nottingham, Jubilee Campus, Nottingham NG8 1BB, UK
| | - Paul Radford
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
| | - Grazziela Figueredo
- Advanced Data Analysis Centre, School of Computer Science, The University of Nottingham, Jubilee Campus, Nottingham NG8 1BB, UK
| | - Elizabeth M McDermott
- Nottingham University Hospitals National Health Service Trust, Queen's Medical Centre Campus, Nottingham NG7 2UH, UK
| | - Elizabeth Drewe
- Nottingham University Hospitals National Health Service Trust, Queen's Medical Centre Campus, Nottingham NG7 2UH, UK
| | - Richard J Powell
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
| | - Susan Bainbridge
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
| | - Mohamed Hamed
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
| | - Sharon Crouch
- Business Engagement and Innovation Services, The University of Nottingham, Jubilee Campus, Nottingham NG8 1BB, UK
| | - Jon Garibaldi
- Advanced Data Analysis Centre, School of Computer Science, The University of Nottingham, Jubilee Campus, Nottingham NG8 1BB, UK
| | - Steve St-Gallay
- Sygnature Discovery Limited, BioCity, Pennyfoot Street, Nottingham NG1 1GF, UK
| | - Lucy C Fairclough
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK.
| | - Patrick J Tighe
- School of Life Sciences, The University of Nottingham, Life Sciences Building, University Park, Nottingham NG7 2RD, UK
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19
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Tammas-Williams S, Withers PJ, Todd I, Prangnell PB. The Influence of Porosity on Fatigue Crack Initiation in Additively Manufactured Titanium Components. Sci Rep 2017; 7:7308. [PMID: 28779073 PMCID: PMC5544733 DOI: 10.1038/s41598-017-06504-5] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2016] [Accepted: 06/06/2017] [Indexed: 11/09/2022] Open
Abstract
Without post-manufacture HIPing the fatigue life of electron beam melting (EBM) additively manufactured parts is currently dominated by the presence of porosity, exhibiting large amounts of scatter. Here we have shown that the size and location of these defects is crucial in determining the fatigue life of EBM Ti-6Al-4V samples. X-ray computed tomography has been used to characterise all the pores in fatigue samples prior to testing and to follow the initiation and growth of fatigue cracks. This shows that the initiation stage comprises a large fraction of life (>70%). In these samples the initiating defect was often some way from being the largest (merely within the top 35% of large defects). Using various ranking strategies including a range of parameters, we found that when the proximity to the surface and the pore aspect ratio were included the actual initiating defect was within the top 3% of defects ranked most harmful. This lays the basis for considering how the deposition parameters can be optimised to ensure that the distribution of pores is tailored to the distribution of applied stresses in additively manufactured parts to maximise the fatigue life for a given loading cycle.
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Affiliation(s)
- S Tammas-Williams
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK. .,School of Materials, University of Manchester, Manchester, M13 9PL, UK.
| | - P J Withers
- School of Materials, University of Manchester, Manchester, M13 9PL, UK
| | - I Todd
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, S1 3JD, UK
| | - P B Prangnell
- School of Materials, University of Manchester, Manchester, M13 9PL, UK
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20
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Ayling K, Bowden T, Tighe P, Todd I, Dilnot EM, Negm OH, Fairclough L, Vedhara K. The application of protein microarray assays in psychoneuroimmunology. Brain Behav Immun 2017; 59:62-66. [PMID: 27640078 DOI: 10.1016/j.bbi.2016.09.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 09/02/2016] [Accepted: 09/13/2016] [Indexed: 12/31/2022] Open
Abstract
Protein microarrays are miniaturized multiplex assays that exhibit many advantages over the commonly used enzyme-linked immunosorbent assay (ELISA). This article aims to introduce protein microarrays to readers of Brain, Behavior, and Immunity and demonstrate its utility and validity for use in psychoneuroimmunological research. As part of an ongoing investigation of psychological and behavioral influences on influenza vaccination responses, we optimized a novel protein microarray to quantify influenza-specific antibody levels in human sera. Reproducibility was assessed by calculating intra- and inter-assay coefficients of variance on serially diluted human IgG concentrations. A random selection of samples was analyzed by microarray and ELISA to establish validity of the assay. For IgG concentrations, intra-assay and inter-assay precision profiles demonstrated a mean coefficient of variance of 6.7% and 11.5% respectively. Significant correlations were observed between microarray and ELISA for all antigens, demonstrating the microarray is a valid alternative to ELISA. Protein microarrays are a highly robust, novel assay method that could be of significant benefit for researchers working in psychoneuroimmunology. They offer high throughput, fewer resources per analyte and can examine concurrent neuro-immune-endocrine mechanisms.
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Affiliation(s)
- K Ayling
- Division of Primary Care, School of Medicine, University of Nottingham, Nottingham, UK
| | - T Bowden
- Division of Primary Care, School of Medicine, University of Nottingham, Nottingham, UK
| | - P Tighe
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - I Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - E M Dilnot
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - O H Negm
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - L Fairclough
- School of Life Sciences, University of Nottingham, Nottingham, UK.
| | - K Vedhara
- Division of Primary Care, School of Medicine, University of Nottingham, Nottingham, UK
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21
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Moz S, Basso D, Bozzato D, Galozzi P, Navaglia F, Negm OH, Arrigoni G, Zambon CF, Padoan A, Tighe P, Todd I, Franchin C, Pedrazzoli S, Punzi L, Plebani M. SMAD4 loss enables EGF, TGFβ1 and S100A8/A9 induced activation of critical pathways to invasion in human pancreatic adenocarcinoma cells. Oncotarget 2016; 7:69927-69944. [PMID: 27655713 PMCID: PMC5342525 DOI: 10.18632/oncotarget.12068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [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: 06/30/2016] [Accepted: 09/05/2016] [Indexed: 12/12/2022] Open
Abstract
Epidermal Growth Factor (EGF) receptor overexpression, KRAS, TP53, CDKN2A and SMAD4 mutations characterize pancreatic ductal adenocarcinoma. This mutational landscape might influence cancer cells response to EGF, Transforming Growth Factor β1 (TGFβ1) and stromal inflammatory calcium binding proteins S100A8/A9. We investigated whether chronic exposure to EGF modifies in a SMAD4-dependent manner pancreatic cancer cell signalling, proliferation and invasion in response to EGF, TGFβ1 and S100A8/A9. BxPC3, homozigously deleted (HD) for SMAD4, and BxPC3-SMAD4+ cells were or not stimulated with EGF (100 ng/mL) for three days. EGF pre-treated and non pretreated cells were stimulated with a single dose of EGF (100 ng/mL), TGFβ1 (0,02 ng/mL), S100A8/A9 (10 nM). Signalling pathways (Reverse Phase Protein Array and western blot), cell migration (Matrigel) and cell proliferation (XTT) were evaluated. SMAD4 HD constitutively activated ERK and Wnt/β-catenin, while inhibiting PI3K/AKT pathways. These effects were antagonized by chronic EGF, which increased p-BAD (anti-apoptotic) in response to combined TGFβ1 and S100A8/A9 stimulation. SMAD4 HD underlied the inhibition of NF-κB and PI3K/AKT in response to TGFβ1 and S100A8/A9, which also induced cell migration. Chronic EGF exposure enhanced cell migration of both BxPC3 and BxPC3-SMAD4+, rendering the cells less sensitive to the other inflammatory stimuli. In conclusion, SMAD4 HD is associated with the constitutive activation of the ERK and Wnt/β-catenin signalling pathways, and favors the EGF-induced activation of multiple signalling pathways critical to cancer proliferation and invasion. TGFβ1 and S100A8/A9 mainly inhibit NF-κB and PI3K/AKT pathways and, when combined, sinergize with EGF in enhancing anti-apoptotic p-BAD in a SMAD4-dependent manner.
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Affiliation(s)
- Stefania Moz
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Daniela Basso
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Dania Bozzato
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Paola Galozzi
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Padova, Italy
| | - Filippo Navaglia
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Ola H. Negm
- University of Nottingham, School of Life Sciences, Queen's Medical Centre, Nottingham, UK
- Mansoura University, Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura City, Egypt
| | - Giorgio Arrigoni
- University of Padova, Department of Biomedical Sciences, Padova, Italy
- Proteomics Center, University of Padova and Azienda Ospedaliera di Padova, Padova, Italy
| | - Carlo-Federico Zambon
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Andrea Padoan
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
| | - Paddy Tighe
- University of Nottingham, School of Life Sciences, Queen's Medical Centre, Nottingham, UK
| | - Ian Todd
- University of Nottingham, School of Life Sciences, Queen's Medical Centre, Nottingham, UK
| | - Cinzia Franchin
- University of Padova, Department of Biomedical Sciences, Padova, Italy
- Proteomics Center, University of Padova and Azienda Ospedaliera di Padova, Padova, Italy
| | | | - Leonardo Punzi
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Padova, Italy
| | - Mario Plebani
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Padova, Italy
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22
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Tubby C, Negm OH, Harrison T, Tighe PJ, Todd I, Fairclough LC. Peripheral killer cells do not differentiate between asthma patients with or without fixed airway obstruction. J Asthma 2016; 54:456-466. [PMID: 27736259 DOI: 10.1080/02770903.2016.1236941] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
OBJECTIVE The three main types of killer cells - CD8+ T cells, NK cells and NKT cells - have been linked to asthma and chronic obstructive pulmonary disease (COPD). However, their role in a small subset of asthma patients displaying fixed airway obstruction (FAO), similar to that seen in COPD, has not been explored. The objective of the present study was to investigate killer cell numbers, phenotype and function in peripheral blood from asthma patients with FAO, asthma patients without FAO, and healthy individuals. METHODS Peripheral CD8+ T cells (CD8+CD3+CD56-), NK cells (CD56+CD3-) and NKT-like cells (CD56+CD3+) of 14 asthma patients with FAO (post-bronchodilator FEV/FVC <0.7, despite clinician-optimised treatment), 7 asthma patients without FAO (post-bronchodilator FEV/FVC ≥ 0.7), and 9 healthy individuals were studied. RESULTS No significant differences were seen between the number, receptor expression, MAPK signalling molecule expression, cytotoxic mediator expression, and functional cytotoxicity of peripheral killer cells from asthma patients with FAO, asthma patients without FAO and healthy individuals. CONCLUSIONS Peripheral killer cell numbers or functions do not differentiate between asthma patients with or without fixed airway obstruction.
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Affiliation(s)
- Carolyn Tubby
- a School of Life Sciences, University of Nottingham , Nottingham , UK
| | - Ola H Negm
- a School of Life Sciences, University of Nottingham , Nottingham , UK.,b Medical Microbiology and Immunology Department , Faculty of Medicine, Mansoura University , Mansoura , Egypt
| | - Timothy Harrison
- c Nottingham Respiratory Research Unit, Division of Respiratory Medicine , School of Medicine, University of Nottingham , Nottingham , UK
| | - Patrick J Tighe
- a School of Life Sciences, University of Nottingham , Nottingham , UK
| | - Ian Todd
- a School of Life Sciences, University of Nottingham , Nottingham , UK
| | - Lucy C Fairclough
- a School of Life Sciences, University of Nottingham , Nottingham , UK
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23
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24
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Burr SA, Whittle J, Fairclough LC, Coombes L, Todd I. Modifying Hofstee standard setting for assessments that vary in difficulty, and to determine boundaries for different levels of achievement. BMC Med Educ 2016; 16:34. [PMID: 26821741 PMCID: PMC4731915 DOI: 10.1186/s12909-016-0555-y] [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] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2014] [Accepted: 01/22/2016] [Indexed: 06/05/2023]
Abstract
BACKGROUND Fixed mark grade boundaries for non-linear assessment scales fail to account for variations in assessment difficulty. Where assessment difficulty varies more than ability of successive cohorts or the quality of the teaching, anchoring grade boundaries to median cohort performance should provide an effective method for setting standards. METHODS This study investigated the use of a modified Hofstee (MH) method for setting unsatisfactory/satisfactory and satisfactory/excellent grade boundaries for multiple choice question-style assessments, adjusted using the cohort median to obviate the effect of subjective judgements and provision of grade quotas. RESULTS Outcomes for the MH method were compared with formula scoring/correction for guessing (FS/CFG) for 11 assessments, indicating that there were no significant differences between MH and FS/CFG in either the effective unsatisfactory/satisfactory grade boundary or the proportion of unsatisfactory graded candidates (p > 0.05). However the boundary for excellent performance was significantly higher for MH (p < 0.01), and the proportion of candidates returned as excellent was significantly lower (p < 0.01). MH also generated performance profiles and pass marks that were not significantly different from those given by the Ebel method of criterion-referenced standard setting. CONCLUSIONS This supports MH as an objective model for calculating variable grade boundaries, adjusted for test difficulty. Furthermore, it easily creates boundaries for unsatisfactory/satisfactory and satisfactory/excellent performance that are protected against grade inflation. It could be implemented as a stand-alone method of standard setting, or as part of the post-examination analysis of results for assessments for which pre-examination criterion-referenced standard setting is employed.
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Affiliation(s)
- Steven A Burr
- Collaboration for the Advancement of Medical Education Research and Assessment (CAMERA), Peninsula Schools of Medicine and Dentistry, Plymouth University, Devon, PL4 8AA, UK
| | - John Whittle
- School of Medicine, University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK
| | - Lucy C Fairclough
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK
| | - Lee Coombes
- Collaboration for the Advancement of Medical Education Research and Assessment (CAMERA), Peninsula Schools of Medicine and Dentistry, Plymouth University, Devon, PL4 8AA, UK
- Current address: Institute of Medical Education, School of Medicine, University of Cardiff, Cardiff, CF14 4YS, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2UH, UK.
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25
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Galozzi P, Negm O, Sfriso P, Tighe P, Todd I, Punzi L. Altered cytokine pattern and inflammatory pathways in monogenic and complex autoinflammatory diseases. Pediatr Rheumatol Online J 2015. [PMCID: PMC4597047 DOI: 10.1186/1546-0096-13-s1-o48] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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26
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Fairclough LC, Stoop AA, Negm OH, Radford PM, Tighe PJ, Todd I. Tumour necrosis factor receptor I blockade shows that TNF-dependent and TNF-independent mechanisms synergise in TNF receptor associated periodic syndrome. Eur J Immunol 2015. [PMID: 26202849 DOI: 10.1002/eji.201545769] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
TNF receptor associated periodic syndrome (TRAPS) is an autoinflammatory disease involving recurrent episodes of fever and inflammation. It is associated with autosomal dominant mutations in TNF receptor superfamily 1A gene localised to exons encoding the ectodomain of the p55 TNF receptor, TNF receptor-1 (TNFR1). The aim of this study was to investigate the role of cell surface TNFR1 in TRAPS, and the contribution of TNF-dependent and TNF-independent mechanisms to the production of cytokines. HEK-293 and SK-HEP-1 cell lines were stably transfected with WT or TRAPS-associated variants of human TNF receptor superfamily 1A gene. An anti-TNFR1 single domain antibody (dAb), and an anti-TNFR1 mAb, bound to cell surface WT and variant TNFR1s. In HEK-293 cells transfected with death domain-inactivated (R347A) TNFR1, and in SK-HEP-1 cells transfected with normal (full-length) TNFR1, cytokine production stimulated in the absence of exogenous TNF by the presence of certain TNFR1 variants was not inhibited by the anti-TNFR1 dAb. In SK-Hep-1 cells, specific TRAPS mutations increased the level of cytokine response to TNF, compared to WT, and this augmented cytokine production was suppressed by the anti-TNFR1 dAb. Thus, TRAPS-associated variants of TNFR1 enhance cytokine production by a TNF-independent mechanism and by sensitising cells to a TNF-dependent stimulation. The TNF-dependent mechanism requires cell surface expression of TNFR1, as this is blocked by TNFR1-specific dAb.
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Affiliation(s)
| | | | - Ola H Negm
- School of Life Sciences, University of Nottingham, Nottingham, UK.,Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
| | - Paul M Radford
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Patrick J Tighe
- School of Life Sciences, University of Nottingham, Nottingham, UK
| | - Ian Todd
- School of Life Sciences, University of Nottingham, Nottingham, UK
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27
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Daffa NI, Tighe PJ, Corne JM, Fairclough LC, Todd I. Natural and disease-specific autoantibodies in chronic obstructive pulmonary disease. Clin Exp Immunol 2015; 180:155-63. [PMID: 25469980 PMCID: PMC4367103 DOI: 10.1111/cei.12565] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [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] [Accepted: 11/28/2014] [Indexed: 12/01/2022] Open
Abstract
Autoimmunity may contribute to the pathogenesis of chronic obstructive pulmonary disease (COPD). Studies have identified disease-specific autoantibodies (DSAAbs) in COPD patients, but natural autoantibodies (NAAbs) may also play a role. Previous studies have concentrated on circulating autoantibodies, but lung-associated autoantibodies may be most important. Our aim was to investigate NAAbs and DSAAbs in the circulation and lungs of COPD smoking (CS) patients compared to smokers (S) without airway obstruction and subjects who have never smoked (NS). Immunoglobulin (Ig)G antibodies that bind to lung tissue components were significantly lower in the circulation of CS patients than NS (with intermediate levels in S), as detected by enzyme-linked immunosorbent assay (ELISA). The levels of antibodies to collagen-1 (the major lung collagen) detected by ELISA were also reduced significantly in CS patients’ sera compared to NS. The detection of these antibodies in NS subjects indicates that they are NAAbs. The occurrence of DSAAbs in some CS patients and S subjects was indicated by high levels of serum IgG antibodies to cytokeratin-18 and collagen-5; furthermore, antibodies to collagen-5 eluted from homogenized lung tissue exposed to low pH (0·1 M glycine, pH 2·8) were raised significantly in CS compared to S and NS. Thus, this study supports a role in COPD for both NAAbs and DSAAbs.
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Affiliation(s)
- N I Daffa
- School of Life Sciences, University of Nottingham, Nottingham, UK; Medical Microbiology Department, King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia
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Greco E, Aita A, Galozzi P, Gava A, Sfriso P, Negm OH, Tighe P, Caso F, Navaglia F, Dazzo E, De Bortoli M, Rampazzo A, Obici L, Donadei S, Merlini G, Plebani M, Todd I, Basso D, Punzi L. The novel S59P mutation in the TNFRSF1A gene identified in an adult onset TNF receptor associated periodic syndrome (TRAPS) constitutively activates NF-κB pathway. Arthritis Res Ther 2015; 17:93. [PMID: 25888769 PMCID: PMC4416318 DOI: 10.1186/s13075-015-0604-7] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Accepted: 03/20/2015] [Indexed: 11/11/2022] Open
Abstract
Introduction Mutations in the TNFRSF1A gene, encoding tumor necrosis factor receptor 1 (TNF-R1), are associated with the autosomal dominant autoinflammatory disorder, called TNF receptor associated periodic syndrome (TRAPS). TRAPS is clinically characterized by recurrent episodes of long-lasting fever and systemic inflammation. A novel mutation (c.262 T > C; S59P) in the TNFRSF1A gene at residue 88 of the mature protein was recently identified in our laboratory in an adult TRAPS patient. The aim of this study was to functionally characterize this novel TNFRSF1A mutation evaluating its effects on the TNF-R1-associated signaling pathways, firstly NF-κB, under particular conditions and comparing the results with suitable control mutations. Methods HEK-293 cell line was transfected with pCMV6-AC construct expressing wild-type (WT) or c.262 T > C (S59P), c.362G > A (R92Q), c.236C > T (T50M) TNFRSF1A mutants. Peripheral blood mononuclear cells (PBMCs) were instead isolated from two TRAPS patients carrying S59P and R92Q mutations and from five healthy subjects. Both transfected HEK-293 and PBMCs were stimulated with tumor necrosis factor (TNF) or interleukin 1β (IL-1β) to evaluate the expression of TNF-R1, the activation of TNF-R1-associated downstream pathways and the pro-inflammatory cytokines by means of immunofluorescent assay, array-based technique, immunoblotting and immunometric assay, respectively. Results TNF induced cytoplasmic accumulation of TNF-R1 in all mutant cells. Furthermore, all mutants presented a particular set of active TNF-R1 downstream pathways. S59P constitutively activated IL-1β, MAPK and SRC/JAK/STAT3 pathways and inhibited apoptosis. Also, NF-κB pathway involvement was demonstrated in vitro by the enhancement of p-IκB-α and p65 nuclear subunit of NF-κB expression in all mutants in the presence of TNF or IL-1β stimulation. These in vitro results correlated with patients’ data from PBMCs. Concerning the pro-inflammatory cytokines secretion, mainly IL-1β induced a significant and persistent enhancement of IL-6 and IL-8 in PBMCs carrying the S59P mutation. Conclusions The novel S59P mutation leads to defective cellular trafficking and to constitutive activation of TNF-R1. This mutation also determines constitutive activation of the IL-1R pathway, inhibition of apoptosis and enhanced and persistent NF-κB activation and cytokine secretion in response to IL-1β stimulation. Electronic supplementary material The online version of this article (doi:10.1186/s13075-015-0604-7) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Eliana Greco
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy. .,University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Ada Aita
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy. .,University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Paola Galozzi
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Alessandra Gava
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Paolo Sfriso
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Ola H Negm
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Derby road, NG7 2UH, Nottingham, UK. .,Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Elgomhouria Street, 35516, Mansoura City, Egypt.
| | - Patrick Tighe
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Derby road, NG7 2UH, Nottingham, UK.
| | - Francesco Caso
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Filippo Navaglia
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Emanuela Dazzo
- Institute of Neuroscience of the National Research Council, Section of Padova, Corso Stati Uniti, 4, 3512, Padova, Italy.
| | - Marzia De Bortoli
- Department of Biology, University of Padova, Via U. Bassi, 58/B, 35121, Padova, Italy.
| | - Alessandra Rampazzo
- Department of Biology, University of Padova, Via U. Bassi, 58/B, 35121, Padova, Italy.
| | - Laura Obici
- Amyloidosis Research and Treatment Center, Biotechnology Research laboratories, Fondazione IRCSS Policlinico San Matteo and University of Pavia, Viale Camillo Golgi 19, 27100, Pavia, Italy.
| | - Simona Donadei
- Amyloidosis Research and Treatment Center, Biotechnology Research laboratories, Fondazione IRCSS Policlinico San Matteo and University of Pavia, Viale Camillo Golgi 19, 27100, Pavia, Italy.
| | - Giampaolo Merlini
- Amyloidosis Research and Treatment Center, Biotechnology Research laboratories, Fondazione IRCSS Policlinico San Matteo and University of Pavia, Viale Camillo Golgi 19, 27100, Pavia, Italy.
| | - Mario Plebani
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Ian Todd
- School of Life Sciences, The University of Nottingham, Queen's Medical Centre, Derby road, NG7 2UH, Nottingham, UK.
| | - Daniela Basso
- University of Padova, Laboratory Medicine, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
| | - Leonardo Punzi
- University of Padova, Rheumatology Unit, Department of Medicine - DIMED, Via Giustiniani 2, 35128, Padova, Italy.
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Galozzi P, Negm O, Greco E, Alkhattabi N, Gava A, Sfriso P, Fairclough L, Todd I, Tighe P, Punzi L. Ex vivo and in vitro production of pro-inflammatory cytokines in Blau syndrome. Reumatismo 2015; 66:277-84. [PMID: 25829188 DOI: 10.4081/reumatismo.2014.772] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2014] [Revised: 01/23/2015] [Accepted: 02/03/2015] [Indexed: 11/22/2022] Open
Abstract
The objective was to study both ex vivo and in vitro secretion of pro-inflammatory cytokines in patients affected by Blau syndrome (BS) and carrying p.E383K mutation in the CARD15/NOD2 gene associated with the disease. For ex vivo studies, peripheral blood mononuclear cells (PBMCs), serum from three patients and healthy controls have been collected. PBMCs have been cultured in the presence or absence of inflammatory enhancers, such as lipopolysaccharide (LPS) and muramyl dipeptide (MDP). The levels of interleukin (IL)-1β, IL-6, IL-8, tumor necrosis factor (TNF)-α and interferon (IFN)-γ were assayed by either immunoassay or array-based system. For in vitro studies, different constructs were created cloning human wild-type and p.E383K-mutated NOD2 cDNA into the expression vector pCMV-Tag2c. HEK293 cell lines were stably transfected, cultured with or without MDP and IL-8 level was assayed in their surnatants. Statistical analysis in both studies was performed using non-parametric tests. Both ex vivo and in vitro studies have not identified a significant increase in secretion of the analyzed proinflammatory cytokines. p.E383K-mutated NOD2 transfected cells express low level of IL-8. The ex vivo basal level results from both serum and PBMCs surnatants present similar levels of IL-1β, IL-6, TNF-α and IFN-γ in patients and controls. The presence of the stimulant agents (LPS and MDP), either individual or paired, does not lead to significant increases in all cytokines concentrations in patients compared to controls. Taken together, the ex vivo and in vitro data suggest that there is not a primary mediation of IL-1β and other pro-inflammatory cytokines in BS patients carrying p.E383K.
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Affiliation(s)
- P Galozzi
- Rheumatology Unit, Department of Medicine - DIMED, University of Padova.
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Tighe PJ, Ryder RR, Todd I, Fairclough LC. ELISA in the multiplex era: potentials and pitfalls. Proteomics Clin Appl 2015; 9:406-22. [PMID: 25644123 PMCID: PMC6680274 DOI: 10.1002/prca.201400130] [Citation(s) in RCA: 240] [Impact Index Per Article: 26.7] [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: 09/03/2014] [Revised: 12/08/2014] [Accepted: 01/19/2015] [Indexed: 12/20/2022]
Abstract
Multiplex immunoassays confer several advantages over widely adopted singleplex immunoassays including increased efficiency at a reduced expense, greater output per sample volume ratios and higher throughput predicating more resolute, detailed diagnostics and facilitating personalised medicine. Nonetheless, to date, relatively few protein multiplex immunoassays have been validated for in vitro diagnostics in clinical/point-of-care settings. This review article will outline the challenges, which must be ameliorated prior to the widespread integration of multiplex immunoassays in clinical settings: (i) biomarker validation; (ii) standardisation of immunoassay design and quality control (calibration and quantification); (iii) availability, stability, specificity and cross-reactivity of reagents; (iv) assay automation and the use of validated algorithms for transformation of raw data into diagnostic results. A compendium of multiplex immunoassays applicable to in vitro diagnostics and a summary of the diagnostic products currently available commercially are included, along with an analysis of the relative states of development for each format (namely planar slide based, suspension and planar/microtitre plate based) with respect to the aforementioned issues.
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Affiliation(s)
- Patrick J Tighe
- School of Life Sciences, The University of Nottingham, Nottingham, UK
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Affiliation(s)
- G F Bottazzo
- Department of Immunology, The Middlesex Hospital Medical School, London W1P 9PG, UK
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Negm OH, Mannsperger HA, McDermott EM, Drewe E, Powell RJ, Todd I, Fairclough LC, Tighe PJ. A pro-inflammatory signalome is constitutively activated by C33Y mutant TNF receptor 1 in TNF receptor-associated periodic syndrome (TRAPS). Eur J Immunol 2014; 44:2096-110. [PMID: 24668260 PMCID: PMC4285816 DOI: 10.1002/eji.201344328] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [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: 11/23/2013] [Revised: 02/09/2014] [Accepted: 03/21/2014] [Indexed: 12/20/2022]
Abstract
Mutations in TNFRSF1A encoding TNF receptor 1 (TNFR1) cause the autosomal dominant TNF receptor-associated periodic syndrome (TRAPS): a systemic autoinflammatory disorder. Misfolding, intracellular aggregation, and ligand-independent signaling by mutant TNFR1 are central to disease pathophysiology. Our aim was to understand the extent of signaling pathway perturbation in TRAPS. A prototypic mutant TNFR1 (C33Y), and wild-type TNFR1 (WT), were expressed at near physiological levels in an SK-Hep-1 cell model. TNFR1-associated signaling pathway intermediates were examined in this model, and in PBMCs from C33Y TRAPS patients and healthy controls. In C33Y-TNFR1-expressing SK-Hep-1 cells and TRAPS patients’ PBMCs, a subtle, constitutive upregulation of a wide spectrum of signaling intermediates and their phosphorylated forms was observed; these were associated with a proinflammatory/antiapoptotic phenotype. In TRAPS patients’ PBMCs, this upregulation of proinflammatory signaling pathways was observed irrespective of concurrent treatment with glucocorticoids, anakinra or etanercept, and the absence of overt clinical symptoms at the time that the blood samples were taken. This study reveals the pleiotropic effect of a TRAPS-associated mutant form of TNFR1 on inflammatory signaling pathways (a proinflammatory signalome), which is consistent with the variable and limited efficacy of cytokine-blocking therapies in TRAPS. It highlights new potential target pathways for therapeutic intervention.
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Affiliation(s)
- Ola H Negm
- School of Life Sciences, The University of Nottingham, UK; Medical Microbiology and Immunology Department, Faculty of Medicine, Mansoura University, Mansoura, Egypt
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Galozzi P, Greco E, Gava A, Basso D, Sfriso P, Tighe P, Todd I, Punzi L. AB0012 Functional Characterization of P.E383k Blau Syndrome-Related Mutation. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.2906] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Todd I, Burr S, Whittle J, Fairclough L. Modifying the Hofstee method may overcome problems. Med Teach 2014; 36:358-359. [PMID: 24548113 DOI: 10.3109/0142159x.2014.887842] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Affiliation(s)
- Ian Todd
- School of Life Sciences, University of Nottingham , Nottingham , UK
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Drewe E, Negm O, Abduljabbar W, Hawkins P, Fairclough L, Todd I, Tighe P. OR13-005 – Investigation of clinical and laboratory significance of TNFRSF1A intron by reverse-phase protein microarray. Pediatr Rheumatol Online J 2013. [PMCID: PMC3952581 DOI: 10.1186/1546-0096-11-s1-a267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Tighe P, Negm O, Todd I, Fairclough L. Utility, reliability and reproducibility of immunoassay multiplex kits. Methods 2013; 61:23-9. [PMID: 23333412 DOI: 10.1016/j.ymeth.2013.01.003] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Accepted: 01/07/2013] [Indexed: 10/27/2022] Open
Abstract
Multiplex technologies are becoming increasingly important in biomarker studies as they enable patterns of biomolecules to be examined, which provide a more comprehensive depiction of disease than individual biomarkers. They are crucial in deciphering these patterns, but it is essential that they are endorsed for reliability, reproducibility and precision. Here we outline the theoretical basis of a variety of multiplex technologies: Bead-based multiplex immunoassays (i.e. Cytometric Bead Arrays, Luminex™ and Bio-Plex Pro™), microtitre plate-based arrays (i.e. Mesoscale Discovery (MSD) and Quantsys BioSciences QPlex), Slide-based Arrays (i.e. FastQuant™) and reverse phase protein arrays. Their utility, reliability and reproducibility are discussed.
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Affiliation(s)
- Paddy Tighe
- COPD Research Group, A Floor, West Block, Queens Medical Centre, The University of Nottingham, Nottingham NG7 2UH, UK
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Vaitla PM, Radford PM, Tighe PJ, Powell RJ, McDermott EM, Todd I, Drewe E. Role of interleukin-6 in a patient with tumor necrosis factor receptor-associated periodic syndrome: Assessment of outcomes following treatment with the anti-interleukin-6 receptor monoclonal antibody tocilizumab. ACTA ACUST UNITED AC 2011; 63:1151-5. [DOI: 10.1002/art.30215] [Citation(s) in RCA: 83] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Faedi F, Barros SCC, Pollacco D, Simpson EK, McCormac J, Moulds V, Watson C, Todd I, Keenan F, Fitzsimmons A. New exoplanets from the SuperWASP-North survey. EPJ Web of Conferences 2011. [DOI: 10.1051/epjconf/20101101003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rebelo SL, Radford PM, Bainbridge SE, Todd I, Tighe PJ. Functional consequences of disease-associated mutations in TNFR1 elucidated by transcriptome analysis. Adv Exp Med Biol 2011; 691:461-70. [PMID: 21153350 DOI: 10.1007/978-1-4419-6612-4_47] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Susana L Rebelo
- Institute of Infection, Immunity & Inflammation, and School of Molecular Medical Sciences, University of Nottingham, Immunology, A Floor West Block, Queen's Medical Centre, Nottingham, NG7 2UH, UK.
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Affiliation(s)
- David Gingell
- a Department of Biology as Applied to Medicine, The Middlesex Hospital Medical School, Cleveland Street, London W1P 6DB, England
| | - Ian Todd
- a Department of Biology as Applied to Medicine, The Middlesex Hospital Medical School, Cleveland Street, London W1P 6DB, England
| | - Oliver S. Heavens
- b Department of Physics, University of York, Heslington, York YO1 5DD, England
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Urbanowicz RA, Lamb JR, Todd I, Corne JM, Fairclough LC. Enhanced effector function of cytotoxic cells in the induced sputum of COPD patients. Respir Res 2010; 11:76. [PMID: 20540777 PMCID: PMC2891678 DOI: 10.1186/1465-9921-11-76] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2010] [Accepted: 06/11/2010] [Indexed: 11/25/2022] Open
Abstract
Background We have previously shown that NK (CD56+CD3-) and NKT-like (CD56+CD3+) cells are reduced in both numbers and cytotoxicity in peripheral blood. The aim of the present study was to investigate their numbers and function within induced sputum. Methods Induced sputum cell numbers and intracellular granzyme B and perforin were analysed by flow cytometry. Immunomagnetically selected CD56+ cells (NK and NKT-like cells) were used in an LDH release assay to determine cytotoxicity. Results The proportion of NK cells and NKT-like cells in smokers with COPD (COPD subjects) was significantly higher (12.7% and 3%, respectively) than in healthy smokers (smokers) (5.7%, p < 0.01; 1%, p < 0.001) and non-smoking healthy subjects (HNS) (4.2%, p < 0.001; 0.8%, p < 0.01). The proportions of NK cells and NKT-like cells expressing both perforin and granzyme B were also significantly higher in COPD subjects compared to smokers and HNS. CD56+ cells from COPD subjects were significantly more cytotoxic (1414 biological lytic activity) than those from smokers (142.5; p < 0.01) and HNS (3.8; p < 0.001) and were inversely correlated to FEV1. (r = -0.75; p = 0.0098). Conclusion We have shown an increased proportion of NK and NKT-like cells in the induced sputum of COPD subjects and have demonstrated that these cells are significantly more cytotoxic in COPD subjects than smokers and HNS.
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Affiliation(s)
- Richard A Urbanowicz
- COPD Research Group, Nottingham Respiratory Biomedical Research Unit, The University of Nottingham, UK
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Rebelo SL, Amel-Kashipaz MR, Radford PM, Bainbridge SE, Fiets R, Fang J, McDermott EM, Powell RJ, Todd I, Tighe PJ. Novel markers of inflammation identified in tumor necrosis factor receptor-associated periodic syndrome (TRAPS) by transcriptomic analysis of effects of TRAPS-associated tumor necrosis factor receptor type I mutations in an endothelial cell line. ACTA ACUST UNITED AC 2009; 60:269-80. [PMID: 19116900 DOI: 10.1002/art.24147] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To analyze the effects of tumor necrosis factor receptor-associated periodic syndrome (TRAPS)-associated mutant tumor necrosis factor receptor type I (TNFRI) expression in a cell type directly relevant to the inflammation in TRAPS, and to identify novel markers associated with mutant TNFRI expression. METHODS Transcriptome analysis on 30,000 human genes was performed on SK-Hep-1 human endothelial cells transfected with either wild-type (WT) or TRAPS-associated mutant TNFRI. Quantitative reverse transcriptase-polymerase chain reaction and protein expression levels measured by enzyme-linked immunosorbent assay verified transcriptional changes for selected genes both in supernatants from cells expressing mutant TNFRI and in patient plasma. RESULTS Cells expressing mutant TNFRI showed up-regulation of multiple proinflammatory genes relative to WT transfectants, including genes for pentraxin 3, granulocyte-macrophage colony-stimulating factor, granulocyte colony-stimulating factor, CCL2, and CCL5, which were also expressed as proteins. In addition, the expression of most of these markers was increased in the plasma and peripheral blood mononuclear cells from TRAPS patients relative to those from healthy controls. The cysteine mutations (C33Y and C52F), which are associated with a more severe clinical phenotype, induced more genes than the low-penetrance mutation R92Q, which is associated with a milder phenotype. The expression of most genes was induced by a death domain (DD)-dependent mechanism, since they were not induced by expression of TNFRI mutants with an inactivated DD. CONCLUSION TRAPS-associated TNFRI mutants induce the expression of multiple genes encoding inflammatory molecules, cellular receptors, transcription factors, and regulators of apoptosis in endothelial cells that require the cytoplasmic signaling properties of the receptor. Different mutants have specific expression profiles, indicating mutation-specific effects. The expression of some of these markers was also elevated in samples from TRAPS patients.
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Affiliation(s)
- Susana L Rebelo
- Institute of Infection, Immunity and Inflammation, School of Molecular Medical Sciences, University of Nottingham, and Queen's Medical Centre, Nottingham, UK
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Todd I, Tighe P, Rebelo S, Powell R. Cell surface expression of TNFRI in tumor necrosis factor receptor-associated periodic syndrome: comment on the article by Nedjai et al. Arthritis Rheum 2008; 58:2213-4; author reply 2214-5. [PMID: 18576329 DOI: 10.1002/art.23551] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Todd I, Radford PM, Ziegler-Heitbrock L, Ghaemmaghami AM, Powell RJ, Tighe PJ. Elevated CD16 expression by monocytes from patients with tumor necrosis factor receptor-associated periodic syndrome. ACTA ACUST UNITED AC 2008; 56:4182-8. [PMID: 18050249 DOI: 10.1002/art.23133] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
OBJECTIVE Tumor necrosis factor receptor-associated periodic syndrome (TRAPS) is an inherited autosomal-dominant autoinflammatory condition caused by mutations in the ectodomain of the 55-kd tumor necrosis factor (TNF) receptor superfamily 1A. Proinflammatory blood monocytes with the phenotype CD14+,CD16+,HLA-DR++ are a major source of TNF, and the number of such monocytes is increased during infection and inflammation. The aim of this study was to investigate whether the expression of circulating CD16+ monocytes is affected in patients with TRAPS. METHODS Peripheral blood obtained from patients with TRAPS and healthy control subjects was stained with monoclonal antibodies to detect CD14++,CD16- monocytes and CD14+,CD16+ monocytes, using flow cytometry. Lipopolysaccharide-induced TNF production was measured by intracellular cytokine staining. Activation-induced shedding of CD16 was investigated by treating blood samples with phorbol myristate acetate. RESULTS The level of CD16 expression by CD14+,CD16+ monocytes, but not their absolute number, was significantly elevated in patients with TRAPS, even though the patients were not experiencing clinically overt episodes of autoinflammation at the time of sampling. These findings are similar to those for the C-reactive protein levels and erythrocyte sedimentation rates in the same patients. The enhanced level of CD16 expression by monocytes from patients with TRAPS was not attributable to a defect in activation-induced shedding of CD16. The CD14+,CD16+ monocytes were the predominant source of TNF in both patients and healthy control subjects. CONCLUSION The level of CD16 expression by monocytes was elevated in patients with TRAPS, as a feature of the underlying constitutive inflammation status.
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Affiliation(s)
- Ian Todd
- Division of Immunology, University of Nottingham, Queen's Medical Centre, Nottingham, UK.
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Todd I, Radford PM, Daffa N, Bainbridge SE, Powell RJ, Tighe PJ. Mutant tumor necrosis factor receptor associated with tumor necrosis factor receptor-associated periodic syndrome is altered antigenically and is retained within patients' leukocytes. ACTA ACUST UNITED AC 2007; 56:2765-73. [PMID: 17665435 DOI: 10.1002/art.22740] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
OBJECTIVE To investigate the effect of mutations in tumor necrosis factor receptor superfamily member 1A (TNFRSF1A) in TNFR-associated periodic syndrome (TRAPS) on the binding of anti-TNFRSF1A monoclonal antibodies (mAb), and to investigate the subcellular distribution of mutant versus wild-type (WT) TNFRSF1A in patients with TRAPS. METHODS HEK 293 cells transfected with WT and/or mutant TNFRSF1A were used to investigate the interaction of anti-TNFRSF1A mAb with the WT and mutant proteins. Monoclonal antibodies that differentially bound to C33Y TNFRSF1A were used to investigate the distribution of WT and mutant TNFRSF1A in TRAPS patients with the C33Y mutation. RESULTS We identified a mAb whose binding to TNFRSF1A was completely abolished by the C33Y or C52F TRAPS-associated mutations, whereas other mutations (T50M, C88Y, R92Q) had lesser effects on the binding of this mAb. A different mAb was found to bind efficiently to all of the mutant forms of TNFRSF1A examined as well as to the WT receptor. Exploitation of the differential binding properties of these mAb indicated that mutant (as distinct from WT) TNFRSF1A showed abnormal intracellular retention in the neutrophils of TRAPS patients with the C33Y mutation, with little if any expression of mutant TNFRSF1A on the cell surface or as soluble receptor in plasma. CONCLUSION TRAPS-associated mutant TNFRSF1A has an antigenically altered structure and shows abnormal retention in the leukocytes of patients with TRAPS, which is consistent with previous findings from in vitro and transgenic model systems. This is consistent with a misfolded protein response contributing to the pathophysiology of TRAPS.
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Affiliation(s)
- Ian Todd
- Division of Immunology, Queen's Medical Center, University of Nottingham, Derby Road, Nottingham, UK.
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Rebelo SL, Bainbridge SE, Amel-Kashipaz MR, Radford PM, Powell RJ, Todd I, Tighe PJ. Modeling of tumor necrosis factor receptor superfamily 1A mutants associated with tumor necrosis factor receptor–associated periodic syndrome indicates misfolding consistent with abnormal function. ACTA ACUST UNITED AC 2006; 54:2674-87. [PMID: 16871532 DOI: 10.1002/art.21964] [Citation(s) in RCA: 94] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
OBJECTIVE To investigate the effect of mutations in the tumor necrosis factor receptor superfamily 1A (TNFRSF1A) gene on the conformation and behavior of the TNFRSF1A protein. Mutations in TNFRSF1A cause the autosomal-dominant, autoinflammatory TNFR-associated periodic syndrome (TRAPS). METHODS The expression of recombinant TNFRSF1A was compared in SK-HEp-1 endothelial cells and HEK 293 epithelial cells stably transfected with full-length R347A or Deltasig constructs of wild-type or TRAPS-associated mutant TNFRSF1A. TNF binding was assessed in HEK 293 cell lines expressing R347A wild-type or mutant TNFRSF1A. Homology modeling of the 3-dimensional structure of the ectodomains of wild-type and mutant TNFRSF1A was performed. RESULTS TRAPS-associated mutant and wild-type TNFRSF1A behaved differently and had different localization properties within the cell, as a direct result of mutations in the ectodomains of TNFRSF1A. From a structural perspective, mutants with a predicted structure similar to that of the wild-type protein (e.g., R92Q) behaved similarly to wild-type TNFRSF1A, whereas forms of TNFRSF1A with mutations predicted to drastically destabilize the protein structure (e.g., cysteine mutations) showed defects in cell surface expression and TNF binding. CONCLUSION The results obtained from the in vitro experiments, in combination with the modeled structures, indicate that the phenotype and clinical differences between different TRAPS-associated mutants of TNFRSF1A result from different conformations of the TNFRSF1A ectodomains.
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MESH Headings
- Carcinoma, Hepatocellular/genetics
- Carcinoma, Hepatocellular/metabolism
- Carcinoma, Hepatocellular/pathology
- Cell Line, Tumor
- Epithelial Cells/cytology
- Epithelial Cells/metabolism
- Familial Mediterranean Fever/genetics
- Familial Mediterranean Fever/metabolism
- Familial Mediterranean Fever/pathology
- Humans
- Kidney/cytology
- Kidney/metabolism
- Models, Molecular
- Mutation, Missense
- Protein Binding
- Protein Conformation
- Protein Folding
- Receptors, Tumor Necrosis Factor, Type I/chemistry
- Receptors, Tumor Necrosis Factor, Type I/genetics
- Receptors, Tumor Necrosis Factor, Type I/metabolism
- Recombinant Fusion Proteins/metabolism
- Tumor Necrosis Factor-alpha/metabolism
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Todd I. Surgery in the third world. Br J Surg 2005. [DOI: 10.1002/bjs.1800780705] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Nowlan ML, Drewe E, Bulsara H, Esposito N, Robins RA, Tighe PJ, Powell RJ, Todd I. Systemic cytokine levels and the effects of etanercept in TNF receptor-associated periodic syndrome (TRAPS) involving a C33Y mutation in TNFRSF1A. Rheumatology (Oxford) 2005; 45:31-7. [PMID: 16287931 DOI: 10.1093/rheumatology/kei090] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
OBJECTIVE To investigate the levels of the pro-inflammatory cytokines IL-6, TNF-alpha, IL-1beta, IL-8, IL-10 and IL-12p70 in the plasma of patients with TNF receptor-associated periodic syndrome (TRAPS) in relation to CRP levels and treatment with etanercept. METHODS Cytokine concentrations were measured in sequential plasma samples obtained from eight patients with a C33Y mutation in TNFRSF1A and diagnosed with TRAPS, using cytokine bead array. The TRAPS samples were compared with samples from normal controls and rheumatoid arthritis patients. RESULTS Levels of IL-6 were significantly elevated in C33Y TRAPS patients and these correlated with CRP levels in some of the patients. IL-8 levels were also significantly elevated in the TRAPS patients. However, neither TNF-alpha nor IL-1beta demonstrated a similar increase. This differed from the patients with rheumatoid arthritis, for whom levels of IL-6, IL-8, TNF-alpha, IL-1beta and IL-10 were significantly elevated. The levels of detectable TNF-alpha in the TRAPS patients' plasma were elevated during etanercept treatment. CONCLUSIONS The cytokine profile of C33Y TRAPS differs from that of a typical autoimmune inflammatory condition such as rheumatoid arthritis, as only IL-6 and IL-8 were elevated in C33Y TRAPS patients, as distinct from a generalized elevation of pro-inflammatory cytokines. However, only some of the C33Y patients tested showed a relationship between elevated IL-6 and CRP. This is consistent with clinical observations that there is marked heterogeneity between individuals with TRAPS, including those in the same family cohort. Although etanercept has a therapeutic effect in some TRAPS patients, it induces increased plasma concentrations of TNF-alpha, possibly by increasing TNF-alpha stability.
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Affiliation(s)
- M L Nowlan
- Division of Immunology, University of Nottingham, Queen's Medical Centre, Nottingham NG7 2UH, UK
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Pritchard DI, Todd I, Brown A, Bycroft BW, Chhabra SR, Williams P, Wood P. Alleviation of insulitis and moderation of diabetes in NOD mice following treatment with a synthetic Pseudomonas aeruginosa signal molecule, N-(3-oxododecanoyl)-L-homoserine lactone. Acta Diabetol 2005; 42:119-22. [PMID: 16258734 DOI: 10.1007/s00592-005-0190-2] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/17/2004] [Accepted: 07/28/2005] [Indexed: 11/30/2022]
Abstract
Quorum sensing signal molecules (QSSMs) from the bacterium Pseudomonas aeruginosa control bacterial population density and the expression of virulence determinants. Coincidentally, and possibly to allow this pathogen to gain a foothold in the human body, certain signal molecules also downregulate immunological responses in an apparently T-helper 1-selective manner, which would suggest their application as therapeutics to some autoimmune diseases. In the present paper, experiments are described that indicate that one particular signal molecule, a synthetic N-(3-oxododecanoyl)-L-homoserine lactone, can be used to alleviate insulitis and diabetes in non-obese diabetic (NOD) mice, suggesting that bacterial signal molecules may represent a novel source of immune modulatory compounds for the treatment of type 1 diabetes, which afflicts more than 2 million individuals in Europe and North America.
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Affiliation(s)
- D I Pritchard
- School of Pharmacy, University of Nottingham, University Park, Nottingham NG7 2RD, UK.
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