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Couto M, Vasconcelos DP, Pereira CL, Neto E, Sarmento B, Lamghari M. Neuro-Immunomodulatory Potential of Nanoenabled 4D Bioprinted Microtissue for Cartilage Tissue Engineering. Adv Healthc Mater 2024:e2400496. [PMID: 38850170 DOI: 10.1002/adhm.202400496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2024] [Revised: 06/03/2024] [Indexed: 06/10/2024]
Abstract
Cartilage defects trigger post-traumatic inflammation, leading to a catabolic metabolism in chondrocytes and exacerbating cartilage degradation. Current treatments aim to relieve pain but fail to target the inflammatory process underlying osteoarthritis (OA) progression. Here, a human cartilage microtissue (HCM) nanoenabled with ibuprofen-loaded poly(lactic-co-glycolic acid) nanoparticles (ibu-PLGA NPs) is 4D-bioprinted to locally mitigate inflammation and impair nerve sprouting. Under an in vitro inflamed environment, the nanoenabled HCM exhibits chondroprotective potential by decreasing the interleukin (IL)1β and IL6 release, while sustaining extracellular matrix (ECM) production. In vivo, assessments utilizing the air pouch mouse model affirm the nanoenabled HCM non-immunogenicity. Nanoenabled HCM-derived secretomes do not elicit a systemic immune response and decrease locally the recruitment of mature dendritic cells and the secretion of multiple inflammatory mediators and matrix metalloproteinases when compared to inflamed HCM condition. Notably, the nanoenabled HCM secretome has no impact on the innervation profile of the skin above the pouch cavity, suggesting a potential to impede nerve growth. Overall, HCM nanoenabled with ibu-PLGA NPs emerges as a potent strategy to mitigate inflammation and protect ECM without triggering nerve growth, introducing an innovative and promising approach in the cartilage tissue engineering field.
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Affiliation(s)
- Marina Couto
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- Instituto Ciências Biomédicas Abel Salazar, Universidade do Porto - ICBAS, Rua Jorge de Viterbo Ferreira 228, Porto, 4050-313, Portugal
| | - Daniela Pereira Vasconcelos
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
| | - Catarina Leite Pereira
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
| | - Estrela Neto
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- Escola Superior de Saúde, Instituto Politécnico do Porto, Rua Dr. António Bernardino de Almeida 400, Porto, 4200-072, Portugal
| | - Bruno Sarmento
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- Instituto Universitário de Ciências da Saúde - IUCS-CESPU, Rua Central de Gandra, 1317, Gandra, 4585-116, Portugal
| | - Meriem Lamghari
- i3S - Instituto de Investigação e Inovação em Saúde, Universidade do Porto, Portugal, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
- INEB - Instituto Nacional de Engenharia Biomédica, Universidade do Porto, Rua Alfredo Allen, 208, Porto, 4200-125, Portugal
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Alsaffar RM, Ali A, Rashid SM, Ahmad SB, Alkholifi FK, Kawoosa MS, Ahmad SP, Rehman MU. Zerumbone Protects Rats from Collagen-Induced Arthritis by Inhibiting Oxidative Outbursts and Inflammatory Cytokine Levels. ACS OMEGA 2023; 8:2982-2991. [PMID: 36713739 PMCID: PMC9878628 DOI: 10.1021/acsomega.2c05749] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/05/2022] [Accepted: 12/22/2022] [Indexed: 05/25/2023]
Abstract
Rheumatoid arthritis (RA) is an immunocompromised disorder characterized by a marked increase in the synthesis of inflammatory molecules that stimulates the destruction of bones and cartilage. The conventional treatment modalities for RA are associated with adverse side effects and lack sensitivity, suggesting an immediate demand for alternate beneficial therapeutic remedies. The current study sought to understand more about zerumbone's anti-inflammatory properties in diagnosing collagen-induced arthritis (CIA) in experimental animals. The current study observed that zerumbone reduced clinical severity in CIA-induced animals compared to healthy animals. Zerumbone administration significantly decreased (p < 0.001) the concentration of SOD, CAT, GR, and GSH in treatment groups. Zerumbone administration drove down significantly (p < 0.001) the concentration of inflammatory cytokine molecules. Zerumbone was effective in bringing significant changes in levels of MPO, NO, LDH, MMP-8, and ELA. The therapeutic potential of zerumbone was found to be associated with reduced joint destruction and restored normal histology in the cartilage and tissue. Adsorption, distribution, metabolism, excretion, and toxicity studies were used to determine the druglike properties of zerumbone. ProTox-II studies revealed that zerumbone did not possess toxic properties like hepatotoxicity, immunotoxicity, carcinogenicity, mutagenicity, and cytotoxicity. Therefore, the present study evaluated the therapeutic properties of zerumbone in CIA animal models.
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Affiliation(s)
- Rana M Alsaffar
- Department
of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj 11942, Saudi
Arabia
| | - Aarif Ali
- Division
of Veterinary Biochemistry, Faculty of Veterinary
Science and Animal Husbandry, SKUAST-Kashmir, Shuhama, Alusteng, Srinagar, Jammu and Kashmir 190006, India
| | - Shahzada Mudasir Rashid
- Division
of Veterinary Biochemistry, Faculty of Veterinary
Science and Animal Husbandry, SKUAST-Kashmir, Shuhama, Alusteng, Srinagar, Jammu and Kashmir 190006, India
| | - Sheikh Bilal Ahmad
- Division
of Veterinary Biochemistry, Faculty of Veterinary
Science and Animal Husbandry, SKUAST-Kashmir, Shuhama, Alusteng, Srinagar, Jammu and Kashmir 190006, India
| | - Faisal K Alkholifi
- Department
of Pharmacology & Toxicology, College of Pharmacy, Prince Sattam Bin Abdulaziz University, P.O. Box 173, Al-Kharj 11942, Saudi
Arabia
| | - Majid Shafi Kawoosa
- Mycoplasma
Laboratory, Faculty of Veterinary Sciences
and Animal Husbandry, Shuhama, Alusteng, Srinagar, Jammu and Kashmir 190006, India
| | - Sheikh Parvaiz Ahmad
- Department
of Statistics, University of Kashmir, Srinagar, Jammu and Kashmir 190006, India
| | - Muneeb U Rehman
- Department
of Clinical Pharmacy, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
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3
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Manda G, Milanesi E, Genc S, Niculite CM, Neagoe IV, Tastan B, Dragnea EM, Cuadrado A. Pros and cons of NRF2 activation as adjunctive therapy in rheumatoid arthritis. Free Radic Biol Med 2022; 190:179-201. [PMID: 35964840 DOI: 10.1016/j.freeradbiomed.2022.08.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 08/02/2022] [Accepted: 08/08/2022] [Indexed: 10/15/2022]
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease with an important inflammatory component accompanied by deregulated redox-dependent signaling pathways that are feeding back into inflammation. In this context, we bring into focus the transcription factor NRF2, a master redox regulator that exerts exquisite antioxidant and anti-inflammatory effects. The review does not intend to be exhaustive, but to point out arguments sustaining the rationale for applying an NRF2-directed co-treatment in RA as well as its potential limitations. The involvement of NRF2 in RA is emphasized through an analysis of publicly available transcriptomic data on NRF2 target genes and the findings from NRF2-knockout mice. The impact of NRF2 on concurrent pathologic mechanisms in RA is explained by its crosstalk with major redox-sensitive inflammatory and cell death-related pathways, in the context of the increased survival of pathologic cells in RA. The proposed adjunctive therapy targeted to NRF2 is further sustained by the existence of promising NRF2 activators that are in various stages of drug development. The interference of NRF2 with conventional anti-rheumatic therapies is discussed, including the cytoprotective effects of NRF2 for alleviating drug toxicity. From another perspective, the review presents how NRF2 activation would be decreasing the efficacy of synthetic anti-rheumatic drugs by increasing drug efflux. Future perspectives regarding pharmacologic NRF2 activation in RA are finally proposed.
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Affiliation(s)
- Gina Manda
- Radiobiology Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania
| | - Elena Milanesi
- Radiobiology Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania
| | - Sermin Genc
- Neurodegeneration and Neuroprotection Laboratory, Izmir Biomedicine and Genome Center, Izmir, Turkey; Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey; Department of Neuroscience, Health Science Institute, Dokuz Eylul University, Izmir, Turkey
| | - Cristina Mariana Niculite
- Radiobiology Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania; Department of Cellular and Molecular Biology and Histology, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Ionela Victoria Neagoe
- Radiobiology Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania
| | - Bora Tastan
- Neurodegeneration and Neuroprotection Laboratory, Izmir Biomedicine and Genome Center, Izmir, Turkey; Izmir International Biomedicine and Genome Institute, Dokuz Eylul University, Izmir, Turkey
| | - Elena Mihaela Dragnea
- Radiobiology Laboratory, Victor Babes National Institute of Pathology, Bucharest, Romania
| | - Antonio Cuadrado
- Department of Biochemistry, Medical College, Autonomous University of Madrid (UAM), Madrid, Spain; Instituto de Investigaciones Biomédicas "Alberto Sols" (CSIC-UAM), Madrid, Spain; Instituto de Investigación Sanitaria La Paz (IdiPaz), Madrid, Spain; Centro de Investigación Biomédica en Red de Enfermedades Neurodegenerativas (CIBERNED), Madrid, Spain.
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Rivas-Arancibia S, Hernández-Orozco E, Rodríguez-Martínez E, Valdés-Fuentes M, Cornejo-Trejo V, Pérez-Pacheco N, Dorado-Martínez C, Zequeida-Carmona D, Espinosa-Caleti I. Ozone Pollution, Oxidative Stress, Regulatory T Cells and Antioxidants. Antioxidants (Basel) 2022; 11:antiox11081553. [PMID: 36009272 PMCID: PMC9405302 DOI: 10.3390/antiox11081553] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/31/2022] [Accepted: 08/05/2022] [Indexed: 12/06/2022] Open
Abstract
Ozone pollution, is a serious health problem worldwide. Repeated exposure to low ozone doses causes a loss of regulation of the oxidation–reduction systems, and also induces a chronic state of oxidative stress. This fact is of special importance for the regulation of different systems including the immune system and the inflammatory response. In addition, the oxidation–reduction balance modulates the homeostasis of these and other complex systems such as metabolism, survival capacity, cell renewal, and brain repair, etc. Likewise, it has been widely demonstrated that in chronic degenerative diseases, an alteration in the oxide-reduction balance is present, and this alteration causes a chronic loss in the regulation of the immune response and the inflammatory process. This is because reactive oxygen species disrupt different signaling pathways. Such pathways are related to the role of regulatory T cells (Treg) in inflammation. This causes an increase in chronic deterioration in the degenerative disease over time. The objective of this review was to study the relationship between environmental ozone pollution, the chronic state of oxidative stress and its effect on Treg cells, which causes the loss of regulation in the inflammatory response as well as the role played by antioxidant systems in various pathologies.
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Internalization of Neutrophil-Derived Microvesicles Modulates TNFα-Stimulated Proinflammatory Cytokine Production in Human Fibroblast-Like Synoviocytes. Int J Mol Sci 2021; 22:ijms22147409. [PMID: 34299030 PMCID: PMC8304992 DOI: 10.3390/ijms22147409] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2021] [Revised: 07/07/2021] [Accepted: 07/07/2021] [Indexed: 01/28/2023] Open
Abstract
Neutrophil-derived microvesicles (NDMVs) have the potential to exert anti-inflammatory effects. Our study aimed to explore the effects of NDMVs on proinflammatory cytokines expressed by tumor necrosis factor α (TNFα)-stimulated fibroblast-like synoviocytes (FLS). FLS were isolated from the synovium of knee osteoarthritis (OA) patients undergoing surgery. NDMVs, isolated from TNFα-stimulated healthy neutrophils, were characterized by electron microscopy and nanoparticle tracking analysis. MTT and scratch wound healing assays were used to measure FLS viability and migration after treatment with NDMVs, while internalization of fluorescently labeled NDMVs was appraised by flow cytometry and confocal microscopy. Levels of proinflammatory cytokines in supernatants were quantified by the Bio-Plex system. Incubation of FLS with NDMVs at a vesicle/cell ratio of 100 resulted in a time-dependent uptake, with 35% of synoviocytes containing microvesicles over a 6–24 h time period, with no significant change in cell viability. TNFα stimulated the cytokine expression in FLS, and NDMVs down-regulated TNFα-induced expression of IL-5, IL-6, IL-8, MCP-1, IFNγ and MIP-1β. However, this down-regulation was selective, as NDMVs had no significant effects on TNFα-stimulated expression of IL-2 or IL-4. NDMVs were internalized by FLS to inhibit TNFα-stimulated broad-spectrum proinflammatory cytokine secretion. NDMVs, therefore, may exhibit an anti-inflammatory role in the regulation of the FLS function.
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Patterson EK, Vanin Moreno N, Fraser DD, Cepinskas G, Iida T, Berard RA. A Proteinase 3 Contribution to Juvenile Idiopathic Arthritis-Associated Cartilage Damage. PATHOPHYSIOLOGY 2021; 28:320-327. [PMID: 35366277 PMCID: PMC8830470 DOI: 10.3390/pathophysiology28030021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 06/18/2021] [Accepted: 06/22/2021] [Indexed: 11/16/2022] Open
Abstract
A full understanding of the molecular mechanisms implicated in the etiopathogenesis of juvenile idiopathic arthritis (JIA) is lacking. A critical role for leukocyte proteolytic activity (e.g., elastase and cathepsin G) has been proposed. While leukocyte elastase’s (HLE) role has been documented, the potential contribution of proteinase 3 (PR3), a serine protease present in abundance in neutrophils, has not been evaluated. In this study we investigated: (1) PR3 concentrations in the synovial fluid of JIA patients using ELISA and (2) the cartilage degradation potential of PR3 by measuring the hydrolysis of fluorescently labeled collagen II in vitro. In parallel, concentrations and collagen II hydrolysis by HLE were assessed. Additionally, the levels of the co-secreted primary granule protein myeloperoxidase (MPO) were assessed in synovial fluid of patients diagnosed with JIA. We report the following levels of analytes in JIA synovial fluid: PR3—114 ± 100 ng/mL (mean ± SD), HLE—1272 ± 1219 ng/mL, and MPO—1129 ± 1659 ng/mL, with a very strong correlation between the PR3 and HLE concentrations (rs = 0.898, p < 1 × 10–6). Importantly, PR3 hydrolyzed fluorescently labeled collagen II as efficiently as HLE. Taken together, these novel findings suggest that PR3 (in addition to HLE) contributes to JIA-associated joint damage.
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Affiliation(s)
- Eric K. Patterson
- Centre for Critical Illness Research, Lawson Health Research Institute, London, ON N6A 5W9, Canada; (E.K.P.); (N.V.M.); (G.C.); (T.I.)
| | - Nicolas Vanin Moreno
- Centre for Critical Illness Research, Lawson Health Research Institute, London, ON N6A 5W9, Canada; (E.K.P.); (N.V.M.); (G.C.); (T.I.)
| | - Douglas D. Fraser
- Lawson Health Research Institute, Children’s Health Research Institute, London, ON N6A 5W9, Canada;
- Department of Physiology and Pharmacology, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
- Department of Paediatrics, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
| | - Gediminas Cepinskas
- Centre for Critical Illness Research, Lawson Health Research Institute, London, ON N6A 5W9, Canada; (E.K.P.); (N.V.M.); (G.C.); (T.I.)
- Department of Medical Biophysics, Western University, London, ON N6A 5C1, Canada
| | - Takaya Iida
- Centre for Critical Illness Research, Lawson Health Research Institute, London, ON N6A 5W9, Canada; (E.K.P.); (N.V.M.); (G.C.); (T.I.)
| | - Roberta A. Berard
- Lawson Health Research Institute, Children’s Health Research Institute, London, ON N6A 5W9, Canada;
- Department of Paediatrics, Schulich School of Medicine and Dentistry, Western University, London, ON N6A 5C1, Canada
- Division of Rheumatology, London Health Sciences Centre, Children’s Hospital, London, ON N6A 5W9, Canada
- Correspondence:
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7
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Lal R, Dhaliwal J, Dhaliwal N, Dharavath RN, Chopra K. Activation of the Nrf2/HO-1 signaling pathway by dimethyl fumarate ameliorates complete Freund's adjuvant-induced arthritis in rats. Eur J Pharmacol 2021; 899:174044. [PMID: 33745959 DOI: 10.1016/j.ejphar.2021.174044] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 03/08/2021] [Accepted: 03/15/2021] [Indexed: 12/13/2022]
Abstract
The nuclear factor erythroid 2-related factor (Nrf2) signaling pathway has recently emerged as a novel therapeutic target in treating various diseases. Therefore, the present study aimed to assess the protective role of the Nrf2 activator, dimethyl fumarate (DMF) in the complete Freund's adjuvant (CFA)- induced arthritis model. DMF (25, 50, and 100 mg/kg) and dexamethasone (2 mg/kg) were orally administered for 14 days. Pain-related tests, paw volume, and arthritic scores were measured weekly. Serum TNF-α, IL-1β, cyclic citrullinated peptide (CCP), C-reactive protein (CRP), and rheumatoid factor (RF) levels were estimated. Nitrite, malondialdehyde (MDA), superoxide dismutase (SOD), glutathione peroxidase (GPx), glutathione (GSH), catalase (CAT), and myeloperoxidase (MPO) levels were also evaluated. NF-κB, Nrf2, HO-1, and COX-2 levels were estimated in the joint tissue. DMF treatment exerted anti-arthritic activity by enhancing the nociceptive threshold, improving arthritis scores, and reducing paw edema. Also, DMF suppressed changes in oxidative stress markers and inflammatory mediators and enhanced Nrf2 and HO-1 levels in CFA-injected rats. These findings indicate that the anti-arthritic activity of DMF may be mediated by the activation of the Nrf2/HO-1 pathway, which reduced oxidative damage and inflammation.
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Affiliation(s)
- Roshan Lal
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Jatinder Dhaliwal
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Navneet Dhaliwal
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Ravinder Naik Dharavath
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India
| | - Kanwaljit Chopra
- Pharmacology Research Laboratory, University Institute of Pharmaceutical Sciences (UIPS), Panjab University, Chandigarh, 160014, India.
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Gualberto Cardoso PR, Diniz Lopes Marques C, de Melo Vilar K, Dantas AT, Branco Pinto Duarte AL, Pitta IDR, Galdino da Rocha Pitta M, Barreto de Melo Rêgo MJ. Interleukin-18 in Brazilian Rheumatoid Arthritis Patients: Can Leflunomide Reduce It? Autoimmune Dis 2021; 2021:6672987. [PMID: 34055402 PMCID: PMC8131162 DOI: 10.1155/2021/6672987] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 04/30/2021] [Indexed: 11/18/2022] Open
Abstract
OBJECTIVES Rheumatoid arthritis affects about 1% of the world's population. This is a chronic autoimmune disease. It is predominant in females with progressive joint damage. Immune cells are involved, especially Th1/Th17 lymphocytes and their inflammatory cytokines. These proteins have different functions in the immune system, such as IL-16 is a chemotactic factor; IL-18 can activate NFκB transcription producing inflammatory proteins; IL-31 can activate the JAK/STAT pathway which leads to the production of inflammatory factors in chronic diseases; IL-33 promotes IL-16 secretion which causes lymphocyte recruitment, and IL-32 and IL-34 appear to increase TNF secretion by macrophages activation in AR. The aim of this study was to evaluate serum levels of IL-16, IL-18, IL-31, IL-32, IL-33, and IL-34 and compare them with the severity and treatment of RA patients if there are any correlations. METHODS A total of 140 RA patients and 40 healthy donors were recruited from the Department of Rheumatology at Hospital das Clínicas from the Federal University of Pernambuco. 60 AR patients were naïve for any treatment. Serum cytokine levels were determined using an ELISA kit. RESULTS Serum IL-16 (p = 0.0491), IL-18 (p < 0.0001), IL-31 (p = 0.0004), and IL-32 (p = 0.0040) levels were significantly increased in RA patients compared with healthy donors. It was observed that patients using leflunomide had the lowest IL-18 levels, close to controls levels (p = 0.0064). CONCLUSION IL-16, IL-18, IL-31, and IL-32 are increased in the serum of RA patients. IL-18 is at lower levels in those AR who are taking leflunomide as treatment.
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Affiliation(s)
- Pablo Ramon Gualberto Cardoso
- Laboratory of Immunomodulation and New Therapeutic Approaches (LINAT), Research Group on Immunomodulation and New Therapeutic Approaches Suely Galdino (Nupit SG), Federal University of Pernambuco, Recife, Brazil
| | | | - Kamila de Melo Vilar
- Laboratory of Immunomodulation and New Therapeutic Approaches (LINAT), Research Group on Immunomodulation and New Therapeutic Approaches Suely Galdino (Nupit SG), Federal University of Pernambuco, Recife, Brazil
| | | | | | - Ivan da Rocha Pitta
- Laboratory of Immunomodulation and New Therapeutic Approaches (LINAT), Research Group on Immunomodulation and New Therapeutic Approaches Suely Galdino (Nupit SG), Federal University of Pernambuco, Recife, Brazil
| | - Maira Galdino da Rocha Pitta
- Laboratory of Immunomodulation and New Therapeutic Approaches (LINAT), Research Group on Immunomodulation and New Therapeutic Approaches Suely Galdino (Nupit SG), Federal University of Pernambuco, Recife, Brazil
| | - Moacyr Jesus Barreto de Melo Rêgo
- Laboratory of Immunomodulation and New Therapeutic Approaches (LINAT), Research Group on Immunomodulation and New Therapeutic Approaches Suely Galdino (Nupit SG), Federal University of Pernambuco, Recife, Brazil
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Fresneda Alarcon M, McLaren Z, Wright HL. Neutrophils in the Pathogenesis of Rheumatoid Arthritis and Systemic Lupus Erythematosus: Same Foe Different M.O. Front Immunol 2021; 12:649693. [PMID: 33746988 PMCID: PMC7969658 DOI: 10.3389/fimmu.2021.649693] [Citation(s) in RCA: 84] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2021] [Accepted: 02/12/2021] [Indexed: 12/14/2022] Open
Abstract
Dysregulated neutrophil activation contributes to the pathogenesis of autoimmune diseases including rheumatoid arthritis (RA) and systemic lupus erythematosus (SLE). Neutrophil-derived reactive oxygen species (ROS) and granule proteases are implicated in damage to and destruction of host tissues in both conditions (cartilage in RA, vascular tissue in SLE) and also in the pathogenic post-translational modification of DNA and proteins. Neutrophil-derived cytokines and chemokines regulate both the innate and adaptive immune responses in RA and SLE, and neutrophil extracellular traps (NETs) expose nuclear neoepitopes (citrullinated proteins in RA, double-stranded DNA and nuclear proteins in SLE) to the immune system, initiating the production of auto-antibodies (ACPA in RA, anti-dsDNA and anti-acetylated/methylated histones in SLE). Neutrophil apoptosis is dysregulated in both conditions: in RA, delayed apoptosis within synovial joints contributes to chronic inflammation, immune cell recruitment and prolonged release of proteolytic enzymes, whereas in SLE enhanced apoptosis leads to increased apoptotic burden associated with development of anti-nuclear auto-antibodies. An unbalanced energy metabolism in SLE and RA neutrophils contributes to the pathology of both diseases; increased hypoxia and glycolysis in RA drives neutrophil activation and NET production, whereas decreased redox capacity increases ROS-mediated damage in SLE. Neutrophil low-density granulocytes (LDGs), present in high numbers in the blood of both RA and SLE patients, have opposing phenotypes contributing to clinical manifestations of each disease. In this review we will describe the complex and contrasting phenotype of neutrophils and LDGs in RA and SLE and discuss their discrete roles in the pathogenesis of each condition. We will also review our current understanding of transcriptomic and metabolomic regulation of neutrophil phenotype in RA and SLE and discuss opportunities for therapeutic targeting of neutrophil activation in inflammatory auto-immune disease.
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Affiliation(s)
- Michele Fresneda Alarcon
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Zoe McLaren
- Liverpool University Hospitals National Health Service (NHS) Foundation Trust, Liverpool, United Kingdom
| | - Helen Louise Wright
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
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10
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Wójcik P, Gęgotek A, Žarković N, Skrzydlewska E. Oxidative Stress and Lipid Mediators Modulate Immune Cell Functions in Autoimmune Diseases. Int J Mol Sci 2021; 22:ijms22020723. [PMID: 33450863 PMCID: PMC7828321 DOI: 10.3390/ijms22020723] [Citation(s) in RCA: 46] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 01/08/2021] [Accepted: 01/11/2021] [Indexed: 12/15/2022] Open
Abstract
Autoimmune diseases, including psoriasis, systemic lupus erythematosus (SLE), and rheumatic arthritis (RA), are caused by a combination of environmental and genetic factors that lead to overactivation of immune cells and chronic inflammation. Since oxidative stress is a common feature of these diseases, which activates leukocytes to intensify inflammation, antioxidants could reduce the severity of these diseases. In addition to activating leukocytes, oxidative stress increases the production of lipid mediators, notably of endocannabinoids and eicosanoids, which are products of enzymatic lipid metabolism that act through specific receptors. Because the anti-inflammatory CB2 receptors are the predominant cannabinoid receptors in leukocytes, endocannabinoids are believed to act as anti-inflammatory factors that regulate compensatory mechanisms in autoimmune diseases. While administration of eicosanoids in vitro leads to the differentiation of lymphocytes into T helper 2 (Th2) cells, eicosanoids are also necessary for the different0iation of Th1 and Th17 cells. Therefore, their antagonists and/or the genetic deletion of their receptors abolish inflammation in animal models of psoriasis—RA and SLE. On the other hand, products of non-enzymatic lipid peroxidation, especially acrolein and 4-hydroxynonenal-protein adducts, mostly generated by an oxidative burst of granulocytes, may enhance inflammation and even acting as autoantigens and extracellular signaling molecules in the vicious circle of autoimmune diseases.
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Affiliation(s)
- Piotr Wójcik
- Department of Analytical Chemistry, Medical University of Bialystok, 15-222 Bialystok, Poland; (P.W.); (A.G.)
| | - Agnieszka Gęgotek
- Department of Analytical Chemistry, Medical University of Bialystok, 15-222 Bialystok, Poland; (P.W.); (A.G.)
| | - Neven Žarković
- Laboratory for Oxidative Stress, Rudjer Boskovic Institute, 10000 Zagreb, Croatia;
| | - Elżbieta Skrzydlewska
- Department of Analytical Chemistry, Medical University of Bialystok, 15-222 Bialystok, Poland; (P.W.); (A.G.)
- Correspondence:
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11
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Wright HL, Lyon M, Chapman EA, Moots RJ, Edwards SW. Rheumatoid Arthritis Synovial Fluid Neutrophils Drive Inflammation Through Production of Chemokines, Reactive Oxygen Species, and Neutrophil Extracellular Traps. Front Immunol 2021; 11:584116. [PMID: 33469455 PMCID: PMC7813679 DOI: 10.3389/fimmu.2020.584116] [Citation(s) in RCA: 80] [Impact Index Per Article: 26.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2020] [Accepted: 11/20/2020] [Indexed: 12/14/2022] Open
Abstract
Rheumatoid arthritis (RA) is a chronic inflammatory disorder affecting synovial joints. Neutrophils are believed to play an important role in both the initiation and progression of RA, and large numbers of activated neutrophils are found within both synovial fluid (SF) and synovial tissue from RA joints. In this study we analyzed paired blood and SF neutrophils from patients with severe, active RA (DAS28>5.1, n=3) using RNA-seq. 772 genes were significantly different between blood and SF neutrophils. IPA analysis predicted that SF neutrophils had increased expression of chemokines and ROS production, delayed apoptosis, and activation of signaling cascades regulating the production of NETs. This activated phenotype was confirmed experimentally by incubating healthy control neutrophils in cell-free RA SF, which was able to delay apoptosis and induce ROS production in both unprimed and TNFα primed neutrophils (p<0.05). RA SF significantly increased neutrophil migration through 3μM transwell chambers (p<0.05) and also increased production of NETs by healthy control neutrophils (p<0.001), including exposure of myeloperoxidase (MPO) and citrullinated histone-H3-positive DNA NETs. IPA analysis predicted NET production was mediated by signaling networks including AKT, RAF1, SRC, and NF-κB. Our results expand the understanding of the molecular changes that take place in the neutrophil transcriptome during migration into inflamed joints in RA, and the altered phenotype in RA SF neutrophils. Specifically, RA SF neutrophils lose their migratory properties, residing within the joint to generate signals that promote joint damage, as well as inflammation via recruitment and activation of both innate and adaptive immune cells. We propose that this activated SF neutrophil phenotype contributes to the chronic inflammation and progressive damage to cartilage and bone observed in patients with RA.
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Affiliation(s)
- Helen L. Wright
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Max Lyon
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Elinor A. Chapman
- Institute of Life Course and Medical Sciences, University of Liverpool, Liverpool, United Kingdom
| | - Robert J. Moots
- Department of Rheumatology, Aintree University Hospital, Liverpool, United Kingdom
- Faculty of Health, Social Care and Medicine, Edge Hill University, Ormskirk, United Kingdom
| | - Steven W. Edwards
- Faculty of Health, Social Care and Medicine, Edge Hill University, Ormskirk, United Kingdom
- Institute of Infection, Veterinary and Ecological Sciences, University of Liverpool, Liverpool, United Kingdom
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12
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Ferreira HB, Melo T, Paiva A, Domingues MDR. Insights in the Role of Lipids, Oxidative Stress and Inflammation in Rheumatoid Arthritis Unveiled by New Trends in Lipidomic Investigations. Antioxidants (Basel) 2021; 10:antiox10010045. [PMID: 33401700 PMCID: PMC7824304 DOI: 10.3390/antiox10010045] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Revised: 12/28/2020] [Accepted: 12/29/2020] [Indexed: 02/07/2023] Open
Abstract
Rheumatoid arthritis (RA) is a highly debilitating chronic inflammatory autoimmune disease most prevalent in women. The true etiology of this disease is complex, multifactorial, and is yet to be completely elucidated. However, oxidative stress and lipid peroxidation are associated with the development and pathogenesis of RA. In this case, oxidative damage biomarkers have been found to be significantly higher in RA patients, associated with the oxidation of biomolecules and the stimulation of inflammatory responses. Lipid peroxidation is one of the major consequences of oxidative stress, with the formation of deleterious lipid hydroperoxides and electrophilic reactive lipid species. Additionally, changes in the lipoprotein profile seem to be common in RA, contributing to cardiovascular diseases and a chronic inflammatory environment. Nevertheless, changes in the lipid profile at a molecular level in RA are still poorly understood. Therefore, the goal of this review was to gather all the information regarding lipid alterations in RA analyzed by mass spectrometry. Studies on the variation of lipid profile in RA using lipidomics showed that fatty acid and phospholipid metabolisms, especially in phosphatidylcholine and phosphatidylethanolamine, are affected in this disease. These promising results could lead to the discovery of new diagnostic lipid biomarkers for early diagnosis of RA and targets for personalized medicine.
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Affiliation(s)
- Helena Beatriz Ferreira
- Mass Spectrometry Center & QOPNA/LAQV-REQUIMTE, Department of Chemistry, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal;
| | - Tânia Melo
- Mass Spectrometry Center & QOPNA/LAQV-REQUIMTE, Department of Chemistry, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal;
- CESAM, Centre for Environmental and Marine Studies, Department of Chemistry, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal
- Correspondence: (T.M.); (M.d.R.D.); Tel.: +351-234-370-698 (M.d.R.D.)
| | - Artur Paiva
- Unidade de Gestão Operacional em Citometria, Centro Hospitalar e Universitário de Coimbra (CHUC), 3004-561 Coimbra, Portugal;
- Coimbra Institute for Clinical and Biomedical Research (iCBR), Faculty of Medicine, University of Coimbra, 3000-370 Coimbra, Portugal
- Instituto Politécnico de Coimbra, ESTESC-Coimbra Health School, Ciências Biomédicas Laboratoriais, 3046-854 Coimbra, Portugal
| | - Maria do Rosário Domingues
- Mass Spectrometry Center & QOPNA/LAQV-REQUIMTE, Department of Chemistry, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal;
- CESAM, Centre for Environmental and Marine Studies, Department of Chemistry, Campus Universitário de Santiago, University of Aveiro, 3810-193 Aveiro, Portugal
- Correspondence: (T.M.); (M.d.R.D.); Tel.: +351-234-370-698 (M.d.R.D.)
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13
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The Role of Thiocyanate in Modulating Myeloperoxidase Activity during Disease. Int J Mol Sci 2020; 21:ijms21176450. [PMID: 32899436 PMCID: PMC7503669 DOI: 10.3390/ijms21176450] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2020] [Revised: 08/31/2020] [Accepted: 09/01/2020] [Indexed: 12/19/2022] Open
Abstract
Thiocyanate (SCN−) is a pseudohalide anion omnipresent across mammals and is particularly concentrated in secretions within the oral cavity, digestive tract and airway. Thiocyanate can outcompete chlorine anions and other halides (F−, Br−, I−) as substrates for myeloperoxidase by undergoing two-electron oxidation with hydrogen peroxide. This forms their respective hypohalous acids (HOX where X− = halides) and in the case of thiocyanate, hypothiocyanous acid (HOSCN), which is also a bactericidal oxidative species involved in the regulation of commensal and pathogenic microflora. Disease may dysregulate redox processes and cause imbalances in the oxidative profile, where typically favoured oxidative species, such as hypochlorous acid (HOCl), result in an overabundance of chlorinated protein residues. As such, the pharmacological capacity of thiocyanate has been recently investigated for its ability to modulate myeloperoxidase activity for HOSCN, a less potent species relative to HOCl, although outcomes vary significantly across different disease models. To date, most studies have focused on therapeutic effects in respiratory and cardiovascular animal models. However, we note other conditions such as rheumatic arthritis where SCN− administration may worsen patient outcomes. Here, we discuss the pathophysiological role of SCN− in diseases where MPO is implicated.
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Ramirez DC, Gomez Mejiba SE. Pulmonary Neutrophilic Inflammation and Noncommunicable Diseases: Pathophysiology, Redox Mechanisms, Biomarkers, and Therapeutics. Antioxid Redox Signal 2020; 33:211-227. [PMID: 32319787 DOI: 10.1089/ars.2020.8098] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Significance: Pulmonary neurophilic inflammation (PNI) is the homing and activation of neutrophil with damage to the microvasculature. This process is involved in pulmonary damage in patients exposed to airborne pollutants (exogenous stressors) and also to systemic inflammation/oxidative stress (endogenous stressors) associated with noncommunicable diseases (NCDs). Recent Advances: PNI is an important trigger of the early onset and progression of NCD in susceptible patients exposed to airborne pollutants. Irritation of the lung microvasculature by exogenous and endogenous stressors causes PNI. Circulating endogenous stressors in NCD can cause PNI. Critical Issues: Air pollution-triggered PNI causes increased circulating endogenous stressors that can trigger NCD in susceptible patients. Systemic inflammation/oxidative stress associated with NCD can cause PNI. Inflammation/end-oxidation products of macromolecules are also potential biomarkers and therapeutic targets for NCD-triggered PNI- and PNI-triggered NCD. Future Directions: Understanding the molecular mechanism of PNI triggered by exogenous or endogenous stressors will help explain the early onset of NCD in susceptible patients exposed to air pollution. It can also help undercover biomarkers and mechanism-based therapeutic targets in air pollutant-triggered PNI, PNI-triggered NCD, and NCD-triggered PNI.
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Affiliation(s)
- Dario C Ramirez
- Laboratory of Experimental and Translational Medicine, IMIBIO-SL, CCT-San Luis, CONICET, School of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis, Argentina
| | - Sandra E Gomez Mejiba
- Laboratory of Experimental Therapeutics and Nutrition, IMIBIO-SL, CCT-San Luis, CONICET, School of Health Sciences, National University of San Luis, San Luis, Argentina
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15
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Pradhan A, Bagchi A, De S, Mitra S, Mukherjee S, Ghosh P, Ghosh A, Chatterjee M. Role of redox imbalance and cytokines in mediating oxidative damage and disease progression of patients with rheumatoid arthritis. Free Radic Res 2019; 53:768-779. [DOI: 10.1080/10715762.2019.1629586] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ayan Pradhan
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Aniruddha Bagchi
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Soumita De
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Sneha Mitra
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Shibabrata Mukherjee
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Parasar Ghosh
- Department of Rheumatology and Clinical Immunology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Alakendu Ghosh
- Department of Rheumatology and Clinical Immunology, Institute of Post Graduate Medical Education and Research, Kolkata, India
| | - Mitali Chatterjee
- Department of Pharmacology, Institute of Post Graduate Medical Education and Research, Kolkata, India
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16
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Xiao X, Saha P, Yeoh BS, Hipp JA, Singh V, Vijay-Kumar M. Myeloperoxidase deficiency attenuates systemic and dietary iron-induced adverse effects. J Nutr Biochem 2018; 62:28-34. [PMID: 30218980 DOI: 10.1016/j.jnutbio.2018.08.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 08/01/2018] [Accepted: 08/11/2018] [Indexed: 02/08/2023]
Abstract
Iron deficiency is routinely treated with oral or systemic iron supplements, which are highly reactive and could induce oxidative stress via augmenting the activity of proinflammatory enzyme myeloperoxidase (MPO). To investigate the extent to which MPO is involved in iron-induced toxicity, acute (24 h) iron toxicity was induced by intraperitoneal administration of FeSO4 (25 mg/kg body weight) to MPO-deficient (MpoKO) mice and their wild-type (WT) littermates. Acute iron toxicity was also assessed in WT mice pretreated with an MPO inhibitor, 4-aminobenzoic acid hydrazide. Systemic iron administration up-regulated circulating MPO and neutrophil elastase and elevated systemic inflammatory and organ damage markers in WT mice. However, genetic deletion of MPO or its inhibition significantly reduced iron-induced organ damage and systemic inflammatory responses. In contrast to the acute model, 8 weeks of 2% carbonyl iron diet feeding to WT mice did not change the levels of circulating MPO and neutrophil elastase but promoted their accumulation in the liver. Even though both MpoKO and WT mice displayed similar levels of diet-induced hyperferremia, MpoKO mice showed significantly reduced inflammatory response and oxidative stress than the WT mice. In addition, WT bone-marrow-derived neutrophils (BMDN) generated more reactive oxygen species than MPO-deficient BMDN upon iron stimulation. Altogether, genetic deficiency or pharmacologic inhibition of MPO substantially attenuated acute and chronic iron-induced toxicity. Our results suggest that targeting MPO during iron supplementation is a promising approach to reduce iron-induced toxicity/side effects in vulnerable population.
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Affiliation(s)
- Xia Xiao
- Department of Nutritional Sciences, The Pennsylvania State University, University Park, PA 16802, USA
| | - Piu Saha
- Department of Physiology & Pharmacology, University of Toledo, OH 43614, USA
| | - Beng San Yeoh
- Graduate Program in Immunology & Infectious Diseases, The Pennsylvania State University, University Park, PA 16802, USA
| | - Jennifer A Hipp
- Department of Pathology, University of Toledo, OH 43614, USA
| | - Vishal Singh
- Department of Physiology & Pharmacology, University of Toledo, OH 43614, USA
| | - Matam Vijay-Kumar
- Department of Physiology & Pharmacology, University of Toledo, OH 43614, USA; Department of Medical Microbiology & Immunology, University of Toledo, OH 43614, USA.
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17
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Kardeş S, Karagülle M, Durak İ, Avcı A, Karagülle MZ. Association of oxidative stress with clinical characteristics in patients with rheumatoid arthritis. Eur J Clin Invest 2018; 48. [PMID: 29144558 DOI: 10.1111/eci.12858] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/07/2017] [Accepted: 11/11/2017] [Indexed: 12/14/2022]
Abstract
BACKGROUND Few studies examining the association between oxidative stress and clinical parameters or disease activity in patients with rheumatoid arthritis (RA) are available. Therefore, the objective of this study was to test whether oxidative stress has any association with clinical parameters and disease activity in patients with RA. MATERIALS AND METHODS In this post hoc cross-sectional study, 45 patients with RA treated with traditional disease-modifying antirheumatic drugs (DMARDs) ± low-dose glucocorticoids ± nonsteroidal analgesics for at least 3 months were analysed. Oxidative stress parameters were malondialdehyde (MDA), superoxide dismutase (SOD), antioxidant potential (AOP) and nonenzymatic superoxide radical scavenger activity (NSSA). Clinical parameters were pain, patient global assessment, physician global assessment, Health Assessment Questionnaire (HAQ), and disease activity score (DAS28). RESULTS Plasma NSSA levels were significantly inversely correlated with tender joints count (r = -.304; P = .042), swollen joints count (r = -.342; P = .021) and DAS28 (r = -.396; P = .009). There were no significant correlations between MDA/SOD/AOP and any of clinical parameters or DAS28 (P > .05 for all). Multiple regression analysis revealed that NSSA was an independent variable of DAS28 (β=-.243, P = .016). CONCLUSION The preliminary results demonstrate that plasma NSSA levels were inversely correlated with tender and swollen joints count and DAS28 and that NSSA was independently associated with DAS28, in patients with RA treated with traditional DMARDs; and provide initial support that NSSA may be used as a biomarker of disease activity in patients with RA.
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Affiliation(s)
- Sinan Kardeş
- Department of Medical Ecology and Hydroclimatology, İstanbul Faculty of Medicine, İstanbul University, Istanbul, Turkey
| | - Mine Karagülle
- Department of Medical Ecology and Hydroclimatology, İstanbul Faculty of Medicine, İstanbul University, Istanbul, Turkey
| | - İlker Durak
- Department of Biochemistry, Ankara University School of Medicine, Ankara, Turkey
| | - Aslıhan Avcı
- Department of Biochemistry, Ankara University School of Medicine, Ankara, Turkey
| | - Müfit Z Karagülle
- Department of Medical Ecology and Hydroclimatology, İstanbul Faculty of Medicine, İstanbul University, Istanbul, Turkey
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18
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Nakabo S, Hashimoto M, Ito S, Furu M, Ito H, Fujii T, Yoshifuji H, Imura Y, Nakashima R, Murakami K, Kuramoto N, Tanaka M, Satoh J, Ishigami A, Morita S, Mimori T, Ohmura K. Carbamylated albumin is one of the target antigens of anti-carbamylated protein antibodies. Rheumatology (Oxford) 2017; 56:1217-1226. [PMID: 28398552 PMCID: PMC5850724 DOI: 10.1093/rheumatology/kex088] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Indexed: 11/20/2022] Open
Abstract
Objectives. Anti-carbamylated protein (anti-CarP) antibodies are detected in RA patients. Fetal calf serum is used as an antigen source in anti-CarP ELISA, and the precise target antigens have not been found. We aimed to identify the target antigens of anti-CarP antibodies. Methods. Western blotting of anti-CarP antibodies was conducted. Anti-carbamylated human albumin (CarALB) antibody was detected by in-house ELISA for 493 RA patients and 144 healthy controls (HCs). An inhibition ELISA of anti-CarP antibodies by CarALB and citrullinated albumin (citALB) was performed using eight RA patients’ sera. Serum CarALB was detected by liquid chromatography–tandem mass spectroscopy (LC/MS/MS), and the serum MPO concentration was measured by ELISA. Results. We focused on carbamylated albumin because it corresponded to the size of the thickest band detected by western blotting of anti-CarP antibodies. Anti-CarALB antibody was detected in 31.4% of RA patients, and the correlation of the titres between anti-CarALB and anti-CarP was much closer than that between anti-citALB and anti-CCP antibodies (ρ = 0.59 and ρ = 0.16, respectively). The inhibition ELISA showed that anti-CarP antibodies were inhibited by CarALB, but not by citALB. CarALB was detected in sera from RA patients by LC/MS/MS. The serum MPO concentration was correlated with disease activity and was higher in RA patients with anti-CarALB antibody than in those without. Conclusion. We found that carbamylated albumin is a novel target antigen of anti-CarP antibodies, and it is the first reported target antigen that has not been reported as the target of ACPA.
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Affiliation(s)
| | | | | | - Moritoshi Furu
- Department of the Control for Rheumatic Diseases.,Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto
| | - Hiromu Ito
- Department of Orthopaedic Surgery, Graduate School of Medicine, Kyoto University, Kyoto
| | - Takao Fujii
- Department of Rheumatology and Clinical Immunology.,Department of Clinical Immunology and Rheumatology, Wakayama Medical University, Wakayama
| | | | | | | | | | | | - Masao Tanaka
- Department of the Control for Rheumatic Diseases
| | | | - Akihito Ishigami
- Tokyo Metropolitan Institute of Gerontology, Molecular Regulation of Aging, Tokyo
| | - Satoshi Morita
- Department of Biomedical Statistics and Bioinformatics, Graduate School of Medicine, Kyoto University, Kyoto, Japan
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19
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Zhang S, Huang G, Yuan K, Zhu Q, Sheng H, Yu R, Luo G, Xu A. Tanshinone IIA ameliorates chronic arthritis in mice by modulating neutrophil activities. Clin Exp Immunol 2017; 190:29-39. [PMID: 28542869 DOI: 10.1111/cei.12993] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/16/2017] [Indexed: 01/13/2023] Open
Abstract
Rheumatoid arthritis (RA) is a chronic immune inflammatory disease mediated by the influx of immune cells into the synovial joint space. As Tanshinone IIA (TIIA) has potent anti-oxidant and anti-inflammatory activities, we used the adjuvant-induced arthritis (AA) murine model of RA to investigate the impact of TIIA on RA and immune cell activation. The anti-arthritic activity of TIIA was investigated in an adjuvant-induced arthritis model of RA in mice. Myeloperoxidase and neutrophil elastase expression levels were assessed in ankle joints by immunohistochemistry analysis. Immune cell infiltration was evaluated in air pouch experiments. Proinflammatory cytokines expression levels were determined by quantitative real-time polymerase chain reaction (PCR) and enzyme-linked immunosorbent assays. Neutrophil extracellular traps (NETs) were assessed by immunostaining and confocal microscopy. Treatment with TIIA alleviated cartilage erosion and neutrophil infiltration in the ankle joints of AA mice and reduced proinflammatory cytokine expression levels in sera. TIIA suppressed interleukin-6 and tumour necrosis factor-α expression and release in neutrophils and promoted neutrophil apoptosis. TIIA also inhibited the NET formation of neutrophils. Our findings demonstrated that TIIA can ameliorate RA effectively by targeting neutrophils, indicating that TIIA may act as a potential therapeutic for RA.
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Affiliation(s)
- S Zhang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - G Huang
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - K Yuan
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - Q Zhu
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - H Sheng
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - R Yu
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - G Luo
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China
| | - A Xu
- School of Life Sciences, Beijing University of Chinese Medicine, Beijing, China.,State Key Laboratory of Biocontrol, Department of Biochemistry, School of Life Sciences, Sun Yat-Sen (Zhongshan) University, Guangzhou, Guangdong, China
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20
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Strzepa A, Pritchard KA, Dittel BN. Myeloperoxidase: A new player in autoimmunity. Cell Immunol 2017; 317:1-8. [PMID: 28511921 PMCID: PMC5665680 DOI: 10.1016/j.cellimm.2017.05.002] [Citation(s) in RCA: 136] [Impact Index Per Article: 19.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2017] [Revised: 05/05/2017] [Accepted: 05/08/2017] [Indexed: 12/22/2022]
Abstract
Myeloperoxidase (MPO) is the most toxic enzyme found in the azurophilic granules of neutrophils. MPO utilizes H2O2 to generate hypochlorous acid (HClO) and other reactive moieties, which kill pathogens during infections. In contrast, in the setting of sterile inflammation, MPO and MPO-derived oxidants are thought to be pathogenic, promoting inflammation and causing tissue damage. In contrast, evidence also exists that MPO can limit the extent of immune responses. Elevated MPO levels and activity are observed in a number of autoimmune diseases including in the central nervous system (CNS) of multiple sclerosis (MS) and the joints of rheumatoid arthritis (RA) patients. A pathogenic role for MPO in driving autoimmune inflammation was demonstrated using mouse models. Mechanisms whereby MPO is thought to contribute to disease pathogenesis include tuning of adaptive immune responses and/or the induction of vascular permeability.
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Affiliation(s)
- Anna Strzepa
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, United States; Department of Medical Biology, Faculty of Health Sciences, Jagiellonian University Medical College, ul. Kopernika 7, 31-034 Krakow, Poland
| | - Kirkwood A Pritchard
- Department of Surgery, Division of Pediatric Surgery, Medical College of Wisconsin, Milwaukee, WI, United States
| | - Bonnie N Dittel
- Blood Research Institute, BloodCenter of Wisconsin, Milwaukee, WI, United States; Department of Microbiology and Immunology, School of Pharmacy, Medical College of Wisconsin, Milwaukee, WI, United States.
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21
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Yuan K, Huang G, Zhang S, Zhu Q, Yu R, Sheng H, Luo G, Xu A. Celastrol alleviates arthritis by modulating the inflammatory activities of neutrophils. JOURNAL OF TRADITIONAL CHINESE MEDICAL SCIENCES 2017. [DOI: 10.1016/j.jtcms.2017.05.007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
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22
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Chlorinated Phospholipids and Fatty Acids: (Patho)physiological Relevance, Potential Toxicity, and Analysis of Lipid Chlorohydrins. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2016; 2016:8386362. [PMID: 28090245 PMCID: PMC5206476 DOI: 10.1155/2016/8386362] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Revised: 10/24/2016] [Accepted: 11/06/2016] [Indexed: 12/17/2022]
Abstract
Chlorinated phospholipids are formed by the reaction of hypochlorous acid (HOCl), generated by the enzyme myeloperoxidase under inflammatory conditions, and the unsaturated fatty acyl residues or the head group. In the first case the generated chlorohydrins are both proinflammatory and cytotoxic, thus having a significant impact on the structures of biomembranes. The latter case leads to chloramines, the properties of which are by far less well understood. Since HOCl is also widely used as a disinfecting and antibacterial agent in medicinal, industrial, and domestic applications, it may represent an additional source of danger in the case of abuse or mishandling. This review discusses the reaction behavior of in vivo generated HOCl and biomolecules like DNA, proteins, and carbohydrates but will focus on phospholipids. Not only the beneficial and pathological (toxic) effects of chlorinated lipids but also the importance of these chlorinated species is discussed. Some selected cleavage products of (chlorinated) phospholipids and plasmalogens such as lysophospholipids, (chlorinated) free fatty acids and α-chloro fatty aldehydes, which are all well known to massively contribute to inflammatory diseases associated with oxidative stress, will be also discussed. Finally, common analytical methods to study these compounds will be reviewed with focus on mass spectrometric techniques.
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23
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Prevalence, sensitivity and specificity of antibodies against carbamylated proteins in a monocentric cohort of patients with rheumatoid arthritis and other autoimmune rheumatic diseases. Arthritis Res Ther 2016; 18:276. [PMID: 27887639 PMCID: PMC5124308 DOI: 10.1186/s13075-016-1173-0] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2016] [Accepted: 11/07/2016] [Indexed: 01/14/2023] Open
Abstract
Background Antibodies against carbamylated proteins (anti-CarP) have been recently identified in the sera of patients with rheumatoid arthritis (RA). The objective of the study was to evaluate the prevalence, sensitivity and specificity of anti-CarP compared to anti-citrullinated peptide antibodies (ACPA) and rheumatoid factor (RF), replicating the existing data in a large cohort of Italian patients with RA and extending the evaluation to other autoimmune rheumatic diseases (AIRDs). Methods Serum samples (n = 607) from 309 patients with RA, 200 disease controls and 98 normal healthy subjects (NHS) were evaluated. Anti-CarP were detected using carbamylated fetal calf serum as the antigen. ACPAs were detected using second-generation ELISA and IgM RF was assessed as part of routine analysis. Results Anti-CarP antibodies were detected in 117 patients with RA (34.4%), ACPA in 190 patients (61.4%) and RF in 202 patients (65.3%). Two (2.04%) of the NHS were positive for anti-CarP, one NHS (1.02%) was positive for ACPA and three NHS were positive for RF (3.06%). Among disease controls, anti-CarP antibodies were detected in 33 patients (16.5%), ACPA in 29 patients (14.5%) and RF in 64 patients (32%). In particular, 16.8% of patients with systemic lupus erythematosus and 31.1% of patients with Sjögren syndrome were positive for anti-CarP. The sensitivity of anti-CarP, ACPA and RF was 46.8%, 61.8% and 64.4%, respectively and specificity was 91.95%, 89.93% and 76.51%, respectively. Conclusions The present study extends the knowledge of anti-CarP antibodies, confirming previous data on the diagnostic accuracy of anti-CarP in RA in a large cohort of Italian patients. Anti-CarP antibodies demonstrated relatively low sensitivity and slightly higher specificity compared to ACPA and RF. Even if predominantly present in RA, anti-CarP was detected in a variable percentage of patients with other autoimmune rheumatic diseases and their generation could be attributed to the inflammatory status; the clinical relevance of anti-CarP antibodies in these latter patients should be further determined.
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Turunen S, Huhtakangas J, Nousiainen T, Valkealahti M, Melkko J, Risteli J, Lehenkari P. Rheumatoid arthritis antigens homocitrulline and citrulline are generated by local myeloperoxidase and peptidyl arginine deiminases 2, 3 and 4 in rheumatoid nodule and synovial tissue. Arthritis Res Ther 2016; 18:239. [PMID: 27765067 PMCID: PMC5072303 DOI: 10.1186/s13075-016-1140-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Accepted: 09/27/2016] [Indexed: 02/04/2023] Open
Abstract
Background Seropositive rheumatoid arthritis (RA) is characterized by autoantibodies binding to citrullinated and homocitrullinated proteins. We wanted to study the expression patterns of these disease-associated protein forms and if the rheumatoid nodule and synovial tissue itself contain biologically active levels of citrullinating peptidyl arginine deiminases 2, 3 and 4 and homocitrullination-facilitating neutrophil enzyme myeloperoxidase. Method Total of 195 synovial samples from metatarsal joints from five ACPA/RF-positive RA patients (n = 77), synovial samples from knees of eight seropositive RA (n = 60), seven seronegative RA (n = 33) and five osteoarthritis (n = 25) patients were analyzed for citrulline and homocitrulline contents using HPLC. The location of citrulline- and homocitrulline-containing proteins, PAD 2, 3, 4 and myeloperoxidase were shown by immunostaining. Myeloperoxidase and citrulline- or homocitrulline-containing proteins were stained on Western blot. Results Overall, necrosis was frequent in metatarsals of seropositive RA and absent in seronegative RA and osteoarthritis patients. In histological analysis, there was a significant local patterning and variation in the citrulline and homocitrulline content and it was highest in metatarsal synovial tissues of seropositive RA patients. We found peptidyl arginine deiminase 2, 3 and 4 in the lining and sublining layers of intact synovial tissue. Myeloperoxidase was found locally around necrotic areas. The tissues with necrosis contained the highest levels of citrulline and homocitrulline. Conclusions Rheumatoid nodules and synovia contain significant amount of PAD2, 3 and 4 and myeloperoxidase enzymes. These enzymes could explain the levels of citrulline and homocitrulline in seropositive RA synovial and rheumatoid nodule tissues especially around necrotic tissue.
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Affiliation(s)
- Sanna Turunen
- Department of Anatomy and Cell Biology, Cancer and Translational Medicine Research Unit, University of Oulu, P.O. Box 5000, 90014, Oulu, Finland.
| | - Johanna Huhtakangas
- Department of Anatomy and Cell Biology, Cancer and Translational Medicine Research Unit, University of Oulu, P.O. Box 5000, 90014, Oulu, Finland.,Division of Rheumatology, Department of Internal Medicine, Oulu University Hospital, Oulu, Finland
| | - Tomi Nousiainen
- Division of Orthopedic Surgery, Oulu University Hospital, Oulu, Finland
| | | | - Jukka Melkko
- Department of Pathology, Cancer and Translational Medicine Research Unit, University of Oulu and Oulu University Hospital, Oulu, Finland
| | - Juha Risteli
- Department of Clinical Chemistry, Cancer and Translational Medicine Research Unit, University of Oulu, Oulu, Finland.,Northern Finland Laboratory Centre NordLab, Oulu University Hospital, Oulu, Finland
| | - Petri Lehenkari
- Department of Anatomy and Cell Biology, Cancer and Translational Medicine Research Unit, University of Oulu, P.O. Box 5000, 90014, Oulu, Finland.,Division of Orthopedic Surgery, Oulu University Hospital, Oulu, Finland
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Oxidative Stress Relevance in the Pathogenesis of the Rheumatoid Arthritis: A Systematic Review. BIOMED RESEARCH INTERNATIONAL 2016; 2016:6097417. [PMID: 27340664 PMCID: PMC4906181 DOI: 10.1155/2016/6097417] [Citation(s) in RCA: 187] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 03/15/2016] [Accepted: 04/03/2016] [Indexed: 12/29/2022]
Abstract
Rheumatoid arthritis (RA) is an autoimmune inflammatory disease whose pathogenic mechanisms remain to be elucidated. The oxidative stress and antioxidants play an important role in the disease process of RA. The study of oxidants and antioxidants biomarkers in RA patients could improve our understanding of disease pathogenesis; likely determining the oxidative stress levels in these patients could prove helpful in assessing disease activity and might also have prognostic implications. To date, the usefulness of oxidative stress biomarkers in RA patients is unclear and the evidence supporting them is heterogeneous. In order to resume and update the information in the status of oxidants and antioxidants and their connection as biomarkers in RA, we performed a systematic literature search in the PubMed database, including clinical trials published in the last five years using the word combination "rheumatoid arthritis oxidative stress". In conclusion, this review supports the fact that the oxidative stress is an active process in RA pathogenesis interrelated to other better known pathogenic elements. However, some controversial results preclude a definite conclusion.
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Thieblemont N, Wright HL, Edwards SW, Witko-Sarsat V. Human neutrophils in auto-immunity. Semin Immunol 2016; 28:159-73. [DOI: 10.1016/j.smim.2016.03.004] [Citation(s) in RCA: 109] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2016] [Revised: 03/08/2016] [Accepted: 03/12/2016] [Indexed: 01/06/2023]
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Miyabe Y, Kim ND, Miyabe C, Luster AD. Studying Chemokine Control of Neutrophil Migration In Vivo in a Murine Model of Inflammatory Arthritis. Methods Enzymol 2016; 570:207-31. [DOI: 10.1016/bs.mie.2015.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Shi J, van Steenbergen HW, van Nies JAB, Levarht EWN, Huizinga TWJ, van der Helm-van Mil AHM, Toes REM, Trouw LA. The specificity of anti-carbamylated protein antibodies for rheumatoid arthritis in a setting of early arthritis. Arthritis Res Ther 2015; 17:339. [PMID: 26601692 PMCID: PMC4657226 DOI: 10.1186/s13075-015-0860-6] [Citation(s) in RCA: 60] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 11/09/2015] [Indexed: 11/10/2022] Open
Abstract
INTRODUCTION Anti-carbamylated protein (anti-CarP) antibodies have been described in rheumatoid arthritis (RA) and arthralgia patients at risk of developing RA. To what extent these autoantibodies are specific for RA is unknown. Therefore, we investigated the diagnostic performance of the presence of anti-CarP antibodies for RA in a setting of early arthritis. METHODS Anti-CarP antibodies were detected using carbamylated fetal calf serum as substrate. Anti-CCP2 antibodies were measured using enzyme-linked immunosorbent assay and immunoglobulin M (IgM) rheumatoid factor (RF) as part of routine care. Sera were derived from patients in the Leiden Early Arthritis Clinic cohort obtained at inclusion. Test characteristics were determined using the fulfillment of the 2010 RA criteria after 1 year as outcome. RESULTS In total 2086 early arthritis patients were studied regarding the presence of anti-CarP antibodies. We observed that the sensitivity and specificity of the presence of anti-CarP antibodies for RA were 44 % and 89 %, respectively. As a reference, sensitivity and specificity of the presence of anti-CCP2 antibodies were 54 % and 96 %, respectively, and of IgM-RF 59 % and 91 %. Patients harboring anti-CarP antibodies not classified as RA were mainly diagnosed with undifferentiated arthritis and less frequently reactive arthritis and psoriatic arthritis. CONCLUSION Anti-CarP antibodies are predominantly present in RA but can also be detected in other forms of arthritis.
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Affiliation(s)
- Jing Shi
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | - Hanna W van Steenbergen
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | - Jessica A B van Nies
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | - E W Nivine Levarht
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | - Tom W J Huizinga
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | | | - René E M Toes
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
| | - Leendert A Trouw
- Department of Rheumatology, Leiden University Medical Center, C1-R, LUMC, PO Box 9600, 2300, RC Leiden, The Netherlands.
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Franck T, Minguet G, Delporte C, Derochette S, Zouaoui Boudjeltia K, Van Antwerpen P, Gach O, Deby-Dupont G, Mouithys-Mickalad A, Serteyn D. An immunological method to combine the measurement of active and total myeloperoxidase on the same biological fluid, and its application in finding inhibitors which interact directly with the enzyme. Free Radic Res 2015; 49:790-9. [PMID: 25968947 DOI: 10.3109/10715762.2015.1027197] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Myeloperoxidase (MPO) is a pro-oxidant enzyme involved in inflammation, and the measurement of its activity in biological samples has emerged essential for laboratory and clinical investigations. We will describe a new method which combines the SIEFED (specific immunological extraction followed by enzymatic detection) and ELISA (ELISAcb) techniques to measure the active and total amounts of MPO on the same human sample and with the same calibration curve, as well as to define an accurate ratio between both the active and total forms of the enzyme. The SIEFED/ELISAcb method consists of the MPO extraction from aqueous or biological samples by immobilized anti-MPO antibodies coated onto microplate wells. After a washing step to eliminate unbound material, the activity of MPO is measured in situ by adding a reaction solution (SIEFED). Following aspiration of the reaction solution, a secondary anti-MPO antibody is added into the wells and the ELISAcb test is carried out in order to measure the total MPO content. To validate the combined method, a comparison was made with SIEFED and ELISA experiments performed separately on plasma samples isolated from human whole blood, after a neutrophil stimulation. The SIEFED/ELISAcb provides a suitable tool for the measurement of specific MPO activity in biological fluids and for the estimation of the inhibitory potential of a fluid. The method can also be used as a pharmacological tool to make the distinction between a catalytic inhibitor, which binds to MPO and inhibits its activity, and a steric inhibitor, which hinders the enzyme and prevents its immunodetection.
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Affiliation(s)
- T Franck
- Department of General Anaesthesia and Surgical Pathology of Large Animals, Faculty of Veterinary Medicine, B 41, University of Liege - Sart Tilman, Liège , Belgium
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