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Wittenborn TR, Hagert C, Ferapontov A, Jensen L, Degn SE. MHCII density only weakly impacts autoreactive germinal center B cell fitness. The Journal of Immunology 2020. [DOI: 10.4049/jimmunol.204.supp.218.30] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Abstract
B cells generate high-affinity antibodies within induced microanatomical structures called germinal centers (GCs). Each GC is, in essence, a Darwinian microcosm, in which B cells undergo consecutive rounds of division, hypermutation, and selection based on antigen affinity. The consensus has been that this selection is governed by T follicular helper (Tfh) cell signals, determined by the amount of cognate peptide presented by B cells on major histocompatibility complex (MHC) class II. This view was recently challenged by observations in a foreign antigen model system suggesting that peptide-MHCII density dictates the degree of initial GC entry, but does not impact B cell selection once in the GC. GCs are central to the development of pathogenic autoantibodies in a breadth of autoimmune diseases, but it is unclear to what extent autoreactive GC behavior mimics that of foreign-antigen-reactive GCs. The question of peptide-MHCII in autoreactive GC fitness is particularly relevant because the linked recognition requirement provides a safeguard against inadvertent autoreactivity. Accordingly, we investigated the role of peptide-MHCII density in self-reactive GC B cell selection in a chimeric mouse model of epitope spreading. Bone marrow chimeras were generated, in which either MHCII null/b or MHCII null/null cells were competing with MHCII b/b cells for participation in chronic autoreactive GCs. Flow cytometry and confocal analysis of GCs revealed that whereas complete MHCII deficiency blocked B cell participation in the GC, partial MHCII deficiency had only a minor impact on GC fitness. Thus, our results confirm, in an autoreactive setting, the recently reported observation of MHCII haplosufficiency in foreign antigen responses.
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Affiliation(s)
| | - Cecilia Hagert
- 1Department of Biomedicine, Aarhus University, Aarhus C, Denmark
| | | | - Lisbeth Jensen
- 1Department of Biomedicine, Aarhus University, Aarhus C, Denmark
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2
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Wittenborn TR, Hagert C, Degn SE. Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity. J Vis Exp 2019. [PMID: 31033960 DOI: 10.3791/59397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022] Open
Abstract
Autoimmune diseases present a significant health burden. Fundamental questions regarding the development and progression of autoimmune disease remain unanswered. One requirement for advancements in our understanding of the underlying disease mechanisms and cellular dynamics is the precise coupling of the microanatomical location of cell subsets with downstream molecular or functional analyses; a goal that has traditionally been difficult to achieve. The development of stable photoactivatable biological fluorophores and their integration into reporter strains has recently enabled precise microanatomical labeling and tracking of cellular subsets in murine models. Here, we describe how the ability to analyze autoreactive lymphocytes from single germinal centers may help to provide novel insights into autoimmunity, using the combination of a novel chimeric model of autoimmunity with a photoactivatable reporter as an example. We demonstrate a procedure for generating mixed chimeras with spontaneous autoreactive germinal centers populated by lymphocytes carrying a photoactivatable green fluorescent protein reporter. Using in vivo labeling strategies, single germinal centers can be visualized in explanted lymphoid tissues and their cellular constituents photoactivated by two-photon microscopy. Photoactivated lymphocytes from single germinal centers can then be analyzed or sorted flow cytometrically, as single cells or in bulk, and may be subjected to additional downstream molecular and functional analyses. This approach may directly be applied to provide renewed insights in the field of autoimmunity, but the procedure for generating bone marrow chimeras and the photoactivation procedure may additionally find broad application in studies of infectious diseases and tumor metastases.
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Hagert C, Siitonen R, Li XG, Liljenbäck H, Roivainen A, Holmdahl R. Rapid spread of mannan to the immune system, skin and joints within 6 hours after local exposure. Clin Exp Immunol 2019; 196:383-391. [PMID: 30712330 DOI: 10.1111/cei.13268] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/21/2019] [Indexed: 12/01/2022] Open
Abstract
Psoriasis (Ps), psoriatic arthritis (PsA) and rheumatoid arthritis (RA) are common diseases dependent on environmental factors that activate the immune system in unknown ways. Mannan is a group of polysaccharides common in the environment; they are potentially pathogenic, because at least some of them induce Ps-, PsA- and RA-like inflammation in mice. Here, we used positron emission tomography/computed tomography to examine in-vivo transport and spread of mannan labelled with fluorine-18 [18 F]. The results showed that mannan was transported to joints (knee) and bone marrow (tibia) of mice within 6 h after intraperitoneal injection. The time it took to transport mannan, and its presence in blood, indicated cellular transport of mannan within the circulatory system. In addition, mannan was filtered mainly through the spleen and liver. [18 F]fluoromannan was excreted via kidneys, small intestine and, to some extent, the mouth. In conclusion, mannan reaches joints rapidly after injection, which may explain why mannan-induced inflammatory disease is targeted to these tissues.
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Affiliation(s)
- C Hagert
- Medical Inflammation Research, MediCity Research Laboratory, University of Turku, Turku, Finland.,The National Doctoral Programme in Informational and Structural Biology, Turku, Finland
| | - R Siitonen
- Turku PET Centre, University of Turku, Turku, Finland
| | - X-G Li
- Turku PET Centre, University of Turku, Turku, Finland.,Turku PET Centre, Åbo Akademi University, Turku, Finland
| | - H Liljenbäck
- Turku PET Centre, University of Turku, Turku, Finland.,Turku Center for Disease Modeling, University of Turku, Turku, Finland
| | - A Roivainen
- Turku PET Centre, University of Turku, Turku, Finland.,Turku Center for Disease Modeling, University of Turku, Turku, Finland.,Turku PET Centre, Turku University Hospital, Turku, Finland
| | - R Holmdahl
- Medical Inflammation Research, MediCity Research Laboratory, University of Turku, Turku, Finland.,Medical Inflammation Research, Department of Biochemistry and Biophysics, Karolinska Institute, Stockholm, Sweden
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Hagert C, Sareila O, Kelkka T, Nandakumar KS, Collin M, Xu B, Guérard S, Bäcklund J, Jalkanen S, Holmdahl R. Chronic Active Arthritis Driven by Macrophages Without Involvement of T Cells: A Novel Experimental Model of Rheumatoid Arthritis. Arthritis Rheumatol 2018. [PMID: 29513929 DOI: 10.1002/art.40482] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
OBJECTIVE To develop a new chronic rheumatoid arthritis model that is driven by the innate immune system. METHODS Injection of a cocktail of 4 monoclonal antibodies against type II collagen, followed on days 5 and 60 by intraperitoneal injections of mannan (from Saccharomyces cerevisiae), was used to induce development of chronic arthritis in B10.Q mice. The role of the innate immune system as compared to the adaptive immune system in this arthritis model was investigated using genetically modified mouse strains. RESULTS A new model of chronic relapsing arthritis was characterized in B10.Q mice, in which a persistently active, chronic disease was found. This relapsing disease was driven by macrophages lacking the ability to mount a reactive oxygen species response against pathogens, and was associated with the classical/alternative pathway, but not the lectin pathway, of complement activation. The disease was independent of Fcγ receptor type III, and also independent of the activity of adaptive immune cells (B and T cells), indicating that the innate immune system, involving complement activation, could be the sole driver of chronicity. CONCLUSION Chronic active arthritis can be driven innately by macrophages without the involvement of T and B cells in the adaptive immune system.
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Affiliation(s)
- Cecilia Hagert
- Medicity, University of Turku and the National Doctoral Programme in Informational and Structural Biology, Turku, Finland
| | - Outi Sareila
- Medicity, University of Turku, Turku, Finland.,Karolinska Institute, Stockholm, Sweden
| | - Tiina Kelkka
- Medicity, University of Turku and the Turku Doctoral Programme of Biomedical Sciences, Turku, Finland
| | | | | | - Bingze Xu
- Karolinska Institute, Stockholm, Sweden
| | | | | | | | - Rikard Holmdahl
- Karolinska Institute, Stockholm, Sweden.,Southern Medical University, Guangzhou, China.,Lund University, Lund, Sweden.,Medicity, University of Turku, The National Doctoral Programme in Informational and Structural Biology, and The Turku Doctoral Programme of Biomedical Sciences, Turku, Finland
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Hagert C, Sareila O, Kelkka T, Jalkanen S, Holmdahl R. The Macrophage Mannose Receptor Regulate Mannan-Induced Psoriasis, Psoriatic Arthritis, and Rheumatoid Arthritis-Like Disease Models. Front Immunol 2018; 9:114. [PMID: 29467756 PMCID: PMC5808283 DOI: 10.3389/fimmu.2018.00114] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [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: 11/07/2017] [Accepted: 01/15/2018] [Indexed: 12/24/2022] Open
Abstract
The injection of mannan into mice can result in the development of psoriasis (Ps) and psoriatic arthritis (PsA), whereas co-injection with antibodies toward collagen type II leads to a chronic rheumatoid-like arthritis. The critical event in all these diseases is mannan-mediated activation of macrophages, causing more severe disease if the macrophages are deficient in neutrophil cytosolic factor 1 (Ncf1), i.e., lack the capacity to make a reactive oxygen species (ROS) burst. In this study, we investigated the role of one of the receptors binding mannan; the macrophage mannose receptor (MR, CD206). MR is a C-type lectin present on myeloid cells and lymphatics. We found that mice deficient in MR expression had more severe mannan-induced Ps, PsA as well as rheumatoid-like arthritis. Interestingly, the MR-mediated protection was partly lost in Ncf1 mutated mice and was associated with an type 2 macrophage expansion. In conclusion, these results show that MR protects against a pathogenic inflammatory macrophage response induced by mannan and is associated with induction of ROS.
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Affiliation(s)
- Cecilia Hagert
- Medicity Research Laboratory, University of Turku, Turku, Finland.,The National Doctoral Programme in Informational and Structural Biology (ISB), Turku, Finland
| | - Outi Sareila
- Medicity Research Laboratory, University of Turku, Turku, Finland.,Medical Inflammation Research, Karolinska Institutet, Stockholm, Sweden
| | - Tiina Kelkka
- Medicity Research Laboratory, University of Turku, Turku, Finland.,The Turku Doctoral Programme of Biomedical Sciences (TuBS), Turku, Finland
| | - Sirpa Jalkanen
- Medicity Research Laboratory, University of Turku, Turku, Finland
| | - Rikard Holmdahl
- Medicity Research Laboratory, University of Turku, Turku, Finland.,Medical Inflammation Research, Karolinska Institutet, Stockholm, Sweden
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Sareila O, Hagert C, Kelkka T, Linja M, Xu B, Kihlberg J, Holmdahl R. Reactive Oxygen Species Regulate Both Priming and Established Arthritis, but with Different Mechanisms. Antioxid Redox Signal 2017; 27:1473-1490. [PMID: 28467721 DOI: 10.1089/ars.2016.6981] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [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] [Indexed: 01/05/2023]
Abstract
AIMS Neutrophil cytosolic factor 1 (NCF1) is a key regulatory component of the phagocytic NOX2 complex, which produces reactive oxygen species (ROS). Polymorphism of the Ncf1 gene is associated with increased arthritis severity. In this study, we generated targeted Ncf1 knock-in mice with inducible Ncf1 expression and determined the critical time window during which the NOX2-derived ROS protect the mice from arthritis. RESULTS Targeted Ncf1 knock-in mice lacked NOX2-derived ROS, and in vivo allelic conversion of Ncf1 by the CreERT2 recombinase led to full protein expression and ROS production within 10 days. Mice in which Ncf1 had been activated before immunization with type II collagen (CII) developed only mild clinical symptoms of collagen-induced arthritis (CIA), whereas the ROS-deficient littermates had severe arthritis. The functional Ncf1 restricted the expansion of IL-17A-producing T cells specific for the immunodominant CII peptide. When the Ncf1 gene was activated after the priming phase, Ncf1-dependent protection from autoimmune arthritis was still observed, together with a reduced number of splenic monocytes but it was not associated with alterations in peptide-specific T cell response. The Ncf1-deficient mice expressed pronounced interferon signature, which could be normalized by conditional expression of Ncf1 and was also present in the Ncf1-mutated mouse during arthritis. Innovation and Conclusion: Ncf1 deficiency has been known to predispose to autoimmunity in both humans and rodents. Our in vivo results point to a regulatory role of NOX2-derived ROS not only during priming but also during the effector phase of CIA, most likely via different mechanisms. Antioxid. Redox Signal. 27, 1473-1490.
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Affiliation(s)
- Outi Sareila
- 1 Medicity Research Laboratory, University of Turku , Turku, Finland
| | - Cecilia Hagert
- 1 Medicity Research Laboratory, University of Turku , Turku, Finland .,2 The National Doctoral Programme, Informational and Structural Biology, Turku, Finland
| | - Tiina Kelkka
- 1 Medicity Research Laboratory, University of Turku , Turku, Finland .,3 Turku Doctoral Programme of Biomedical Sciences, Turku, Finland
| | - Marjo Linja
- 1 Medicity Research Laboratory, University of Turku , Turku, Finland
| | - Bingze Xu
- 4 Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
| | - Jan Kihlberg
- 5 Department of Chemistry, BMC, Uppsala University , Uppsala, Sweden
| | - Rikard Holmdahl
- 1 Medicity Research Laboratory, University of Turku , Turku, Finland .,4 Division of Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet , Stockholm, Sweden
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Ge C, Tong D, Liang B, Lönnblom E, Schneider N, Hagert C, Viljanen J, Ayoglu B, Stawikowska R, Nilsson P, Fields GB, Skogh T, Kastbom A, Kihlberg J, Burkhardt H, Dobritzsch D, Holmdahl R. Anti-citrullinated protein antibodies cause arthritis by cross-reactivity to joint cartilage. JCI Insight 2017; 2:93688. [PMID: 28679953 DOI: 10.1172/jci.insight.93688] [Citation(s) in RCA: 38] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2017] [Accepted: 05/23/2017] [Indexed: 12/29/2022] Open
Abstract
Today, it is known that autoimmune diseases start a long time before clinical symptoms appear. Anti-citrullinated protein antibodies (ACPAs) appear many years before the clinical onset of rheumatoid arthritis (RA). However, it is still unclear if and how ACPAs are arthritogenic. To better understand the molecular basis of pathogenicity of ACPAs, we investigated autoantibodies reactive against the C1 epitope of collagen type II (CII) and its citrullinated variants. We found that these antibodies are commonly occurring in RA. A mAb (ACC1) against citrullinated C1 was found to cross-react with several noncitrullinated epitopes on native CII, causing proteoglycan depletion of cartilage and severe arthritis in mice. Structural studies by X-ray crystallography showed that such recognition is governed by a shared structural motif "RG-TG" within all the epitopes, including electrostatic potential-controlled citrulline specificity. Overall, we have demonstrated a molecular mechanism that explains how ACPAs trigger arthritis.
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Affiliation(s)
- Changrong Ge
- Section for Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Dongmei Tong
- Section for Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.,Department of Pathophysiology, Key Lab for Shock and Microcirculation Research of Guangdong, Southern Medical University, Guangzhou, China
| | - Bibo Liang
- Section for Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.,Department of Pathophysiology, Key Lab for Shock and Microcirculation Research of Guangdong, Southern Medical University, Guangzhou, China
| | - Erik Lönnblom
- Section for Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden
| | - Nadine Schneider
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Project Group Translational Medicine & Pharmacology, and Division of Rheumatology, University Hospital Frankfurt Goethe University, Frankfurt, Germany
| | - Cecilia Hagert
- Medicity Research Laboratory, University of Turku, Turku, Finland; National Doctoral Programme in Informational and Structural Biology, Turku, Finland
| | - Johan Viljanen
- Section of Organic Chemistry, Department of Chemistry - Biomedicinskt centrum, Uppsala University, Uppsala, Sweden
| | - Burcu Ayoglu
- Affinity Proteomics, Science for Life Laboratory, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Roma Stawikowska
- Department of Chemistry & Biochemistry, Florida Atlantic University, Jupiter, Florida, USA
| | - Peter Nilsson
- Affinity Proteomics, Science for Life Laboratory, School of Biotechnology, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Gregg B Fields
- Department of Chemistry & Biochemistry, Florida Atlantic University, Jupiter, Florida, USA
| | - Thomas Skogh
- Department of Rheumatology, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Alf Kastbom
- Department of Rheumatology, Department of Clinical and Experimental Medicine, Linköping University, Linköping, Sweden
| | - Jan Kihlberg
- Section of Organic Chemistry, Department of Chemistry - Biomedicinskt centrum, Uppsala University, Uppsala, Sweden
| | - Harald Burkhardt
- Fraunhofer Institute for Molecular Biology and Applied Ecology IME, Project Group Translational Medicine & Pharmacology, and Division of Rheumatology, University Hospital Frankfurt Goethe University, Frankfurt, Germany
| | - Doreen Dobritzsch
- Section of Biochemistry, Department of Chemistry - Biomedicinskt centrum, Uppsala University, Uppsala, Sweden
| | - Rikard Holmdahl
- Section for Medical Inflammation Research, Department of Medical Biochemistry and Biophysics, Karolinska Institutet, Stockholm, Sweden.,Medicity Research Laboratory, University of Turku, Turku, Finland; National Doctoral Programme in Informational and Structural Biology, Turku, Finland.,Center for Medical Immunopharmacology Research, Southern Medical University, Guangzhou, China
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Li XG, Hagert C, Siitonen R, Virtanen H, Sareila O, Liljenbäck H, Tuisku J, Knuuti J, Bergman J, Holmdahl R, Roivainen A. (18)F-Labeling of Mannan for Inflammation Research with Positron Emission Tomography. ACS Med Chem Lett 2016; 7:826-30. [PMID: 27660685 DOI: 10.1021/acsmedchemlett.6b00160] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [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: 04/14/2016] [Accepted: 05/16/2016] [Indexed: 12/14/2022] Open
Abstract
Recently mannan from Saccharomyces cerevisiae has been shown to be able to induce psoriasis and psoriatic arthritis in mice, and the phenotypes resemble the corresponding human diseases. To investigate the pathological processes, we set out to label mannan with fluorine-18 ((18)F) and study the (18)F-labeled mannan in vitro and in vivo with positron emission tomography (PET). Accordingly, mannan has been transformed into (18)F-fluoromannan with (18)F-bicyclo[6.1.0]nonyne. In mouse aorta, the binding of [(18)F]fluoromannan to the atherosclerotic lesions was clearly visualized and was significantly higher compared to blocking assays (P < 0.001) or healthy mouse aorta (P < 0.001). In healthy rats the [(18)F]fluoromannan radioactivity accumulated largely in the macrophage-rich organs such as liver, spleen, and bone marrow and the excess excreted in urine. Furthermore, the corresponding (19)F-labeled mannan has been used to induce psoriasis and psoriatic arthritis in mice, which indicates that the biological function of mannan is preserved after the chemical modifications.
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Affiliation(s)
- Xiang-Guo Li
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku PET
Centre, Åbo Akademi University, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Cecilia Hagert
- Medical
Inflammation Research, Medicity Research Laboratory, University of Turku, FI-20520 Turku, Finland
- The National Doctoral Programme in Informational and Structural Biology, Tykistökatu 6, FI-20520 Turku, Finland
| | - Riikka Siitonen
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Helena Virtanen
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku
PET Centre, Turku University Hospital, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Outi Sareila
- Medical
Inflammation Research, Medicity Research Laboratory, University of Turku, FI-20520 Turku, Finland
| | - Heidi Liljenbäck
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku
Center for Disease Modeling, University of Turku, FI-20014 Turku, Finland
| | - Jouni Tuisku
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Juhani Knuuti
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku
PET Centre, Turku University Hospital, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Jörgen Bergman
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku PET
Centre, Åbo Akademi University, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
| | - Rikard Holmdahl
- Medical
Inflammation Research, Medicity Research Laboratory, University of Turku, FI-20520 Turku, Finland
- Medical
Inflammation Research, Department of Biochemistry and Biophysics, Karolinska Institute, SE-17177 Stockholm, Sweden
| | - Anne Roivainen
- Turku
PET Centre, University of Turku, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku
PET Centre, Turku University Hospital, Kiinamyllynkatu 4-8, FI-20520 Turku, Finland
- Turku
Center for Disease Modeling, University of Turku, FI-20014 Turku, Finland
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Holmdahl R, Sareila O, Pizzolla A, Winter S, Hagert C, Jaakkola N, Kelkka T, Olsson LM, Wing K, Bäckdahl L. Hydrogen peroxide as an immunological transmitter regulating autoreactive T cells. Antioxid Redox Signal 2013; 18:1463-74. [PMID: 22900704 DOI: 10.1089/ars.2012.4734] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
SIGNIFICANCE An unexpected finding, revealed by positional cloning of genetic polymorphisms controlling models for rheumatoid arthritis, exposed a new function of Ncf1 and NADPH oxidase (NOX) 2 controlled oxidative burst. RECENT ADVANCES A decreased capacity to produce ROS due to a natural polymorphism was found to be the major factor leading to more severe arthritis and increased T cell-dependent autoimmunity. CRITICAL ISSUES In the vein of this finding, we here review a possible new role of ROS in regulating inflammatory cell and autoreactive T cell activity. It is postulated that peroxide is an immunologic transmitter secreted by antigen-presenting cells that downregulate the responses by autoreactive T cells. FUTURE DIRECTIONS This may operate at different levels of T cell selection and activation: during negative selection in the thymus, priming of T cells in draining lymph nodes, and while interacting with macrophages in peripheral target tissues.
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Affiliation(s)
- Rikard Holmdahl
- Medical Inflammation Research, MBB, Karolinska Institutet, Stockholm, Sweden.
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Hagert M, Trenckmann H, Hagert C. [Experimental studies on the antigen structure of the human heart by means of immunoelectrophoresis]. Z Gesamte Inn Med 1968; 23:596-600. [PMID: 5702923] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
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