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Gao S, Jiao X, Guo R, Song X, Li B, Guo L. Reduced serum IgG galactosylation is associated with increased inflammation during relapses of neuromyelitis optica spectrum disorders. Front Immunol 2024; 15:1357475. [PMID: 38576616 PMCID: PMC10991735 DOI: 10.3389/fimmu.2024.1357475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 03/08/2024] [Indexed: 04/06/2024] Open
Abstract
Background and Objective Post-translational modifications of antibodies, with a specific focus on galactosylation, have garnered increasing attention in the context of understanding the pathogenesis and therapeutic implications of autoimmune diseases. However, the comprehensive scope and the clinical significance of antibody galactosylation in the context of Neuromyelitis Optica Spectrum Disorder (NMOSD) remain enigmatic.The primary aim of this research was to discern disparities in serum IgG galactosylation levels between individuals in the acute stage of NMOSD relapse and their age- and sex-matched healthy counterparts. Methods A total of fourteen untreated NMOSD patients experiencing an acute relapse phase, along with thirteen patients under medication, were enrolled, and an additional twelve healthy controls of the same age and gender were recruited for this investigation. Western blot and lectin enzyme techniques were used to determine the level of IgG galactosylation in the serum samples from these subjects. The expression of CD45+, CD3+, CD3+CD4+, CD3+CD8+, CD19+, and CD16+CD56+ in peripheral blood leukocytes was measured by flow cytometry. The enzyme-linked immunosorbent assay (ELISA) was also used to quantify the amounts of IgG. Magnetic particle luminescence assays are used to detect cytokines. Robust statistical analysis was executed to ascertain the potential associations between IgG galactosylation and the aforementioned immune indices. Results In the context of NMOSD relapses, serum IgG galactosylation exhibited a notable decrease in untreated patients (0.2482 ± 0.0261), while it remained comparatively stable in medicated patients when contrasted with healthy controls (0.3625 ± 0.0259) (p=0.0159). Furthermore, a noteworthy inverse correlation between serum IgG galactosylation levels and the Expanded Disability Status Scale (EDSS) score during NMOSD relapse was observed (r=-0.4142; p=0.0317). Notably, IgG galactosylation displayed an inverse correlation with NMOSD relapse among peripheral blood CD45+, CD3+, CD3+CD8+, CD19+ cells, as well as with IL-6 and IL-8. Nevertheless, it was not determined whether IgG galactosylation and CD3+CD4+ T cells or other cytokines are statistically significantly correlated. Conclusion Our research identified reduced IgG galactosylation in the serum of NMOSD patients during relapses, significantly correlated with disease severity, thereby providing a novel target for the diagnosis and treatment of NMOSD in the realm of medical research.
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Affiliation(s)
- Shiyu Gao
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
| | - Xin Jiao
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
| | - Ruoyi Guo
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
| | - Xiujuan Song
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
| | - Bin Li
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
| | - Li Guo
- Department of Neurology, The Second Hospital of Hebei Medical University, Shijiazhuang, China
- Key Laboratory of Neurology (Hebei Medical University), Ministry of Education, Shijiazhuang, China
- Key Laboratory of Neurology of Hebei Province, Shijiazhuang, China
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2
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Trzos S, Link-Lenczowski P, Pocheć E. The role of N-glycosylation in B-cell biology and IgG activity. The aspects of autoimmunity and anti-inflammatory therapy. Front Immunol 2023; 14:1188838. [PMID: 37575234 PMCID: PMC10415207 DOI: 10.3389/fimmu.2023.1188838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 06/28/2023] [Indexed: 08/15/2023] Open
Abstract
The immune system is strictly regulated by glycosylation through the addition of highly diverse and dynamically changing sugar structures (glycans) to the majority of immune cell receptors. Although knowledge in the field of glycoimmunology is still limited, numerous studies point to the key role of glycosylation in maintaining homeostasis, but also in reflecting its disruption. Changes in oligosaccharide patterns can lead to impairment of both innate and acquired immune responses, with important implications in the pathogenesis of diseases, including autoimmunity. B cells appear to be unique within the immune system, since they exhibit both innate and adaptive immune activity. B cell surface is rich in glycosylated proteins and lectins which recognise glycosylated ligands on other cells. Glycans are important in the development, selection, and maturation of B cells. Changes in sialylation and fucosylation of cell surface proteins affect B cell signal transduction through BCRs, CD22 inhibitory coreceptor and Siglec-G. Plasmocytes, as the final stage of B cell differentiation, produce and secrete immunoglobulins (Igs), of which IgGs are the most abundant N-glycosylated proteins in human serum with the conserved N-glycosylation site at Asn297. N-oligosaccharide composition of the IgG Fc region affects its secretion, structure, half-life and effector functions (ADCC, CDC). IgG N-glycosylation undergoes little change during homeostasis, and may gradually be modified with age and during ongoing inflammatory processes. Hyperactivated B lymphocytes secrete autoreactive antibodies responsible for the development of autoimmunity. The altered profile of IgG N-glycans contributes to disease progression and remission and is sensitive to the application of therapeutic substances and immunosuppressive agents. In this review, we focus on the role of N-glycans in B-cell biology and IgG activity, the rearrangement of IgG oligosaccharides in aging, autoimmunity and immunosuppressive therapy.
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Affiliation(s)
- Sara Trzos
- Department of Glycoconjugate Biochemistry, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Krakow, Poland
- Doctoral School of Exact and Natural Sciences, Faculty of Biology, Jagiellonian University, Krakow, Poland
| | - Paweł Link-Lenczowski
- Department of Medical Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, Krakow, Poland
| | - Ewa Pocheć
- Department of Glycoconjugate Biochemistry, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Krakow, Poland
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3
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Norris PAA, Tawhidi Z, Sachs UJ, Cserti-Gazdewich CM, Lin Y, Callum J, Gil Gonzalez L, Shan Y, Branch DR, Lazarus AH. Serum from half of patients with immune thrombocytopenia trigger macrophage phagocytosis of platelets. Blood Adv 2023; 7:3561-3572. [PMID: 37042934 PMCID: PMC10368862 DOI: 10.1182/bloodadvances.2022009423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2022] [Revised: 03/21/2023] [Accepted: 04/05/2023] [Indexed: 04/13/2023] Open
Abstract
Humoral antiplatelet factors, such as autoantibodies, are thought to primarily clear platelets by triggering macrophage phagocytosis in immune thrombocytopenia (ITP). However, there are few studies characterizing the capacity and mechanisms of humoral factor-triggered macrophage phagocytosis of platelets using specimens from patients with ITP. Here, we assessed sera from a cohort of 24 patients with ITP for the capacity to trigger macrophage phagocytosis of normal donor platelets and characterized the contribution of humoral factors to phagocytosis. Sera that produced a phagocytosis magnitude greater than a normal human serum mean + 2 standard deviations were considered phagocytosis-positive. Overall, 42% (8/19) of MHC I alloantibody-negative ITP sera were phagocytosis-positive. The indirect monoclonal antibody immobilization of platelet antigens assay was used to detect immunoglobulin G (IgG) autoantibodies to glycoproteins (GP)IIb/IIIa, GPIb/IX, and GPIa/IIa. Autoantibody-positive sera triggered a higher mean magnitude of phagocytosis than autoantibody-negative sera. Phagocytosis correlated inversely with platelet counts among autoantibody-positive patients but not among autoantibody-negative patients. Select phagocytosis-positive sera were separated into IgG-purified and -depleted fractions via protein G and reassessed for phagocytosis. Phagocytosis was largely retained in the purified IgG fractions. In addition, we assessed serum concentrations of C-reactive protein, serum amyloid P, and pentraxin 3 as potential phagocytosis modulators. Pentraxin 3 concentrations correlated inversely with platelet counts among patients positive for autoantibodies. Taken together, sera from approximately half of the patients with ITP studied triggered macrophage phagocytosis of platelets beyond a normal level. An important role for antiplatelet autoantibodies in phagocytosis is supported; a role for pentraxins such as pentraxin 3 may be suggested.
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Affiliation(s)
- Peter A. A. Norris
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- Toronto Platelet Immunobiology Group, Toronto, ON, Canada
| | - Zoya Tawhidi
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- Toronto Platelet Immunobiology Group, Toronto, ON, Canada
| | - Ulrich J. Sachs
- Institute for Clinical Immunology, Transfusion Medicine, and Haemostasis, Justus Liebig University, Giessen, Germany
- Department of Thrombosis and Haemostasis, Giessen University Hospital, Giessen, Germany
| | - Christine M. Cserti-Gazdewich
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Laboratory Medicine Program, University Health Network, Toronto, ON, Canada
- University of Toronto Quality in Utilization, Education and Safety in Transfusion Research Program, University of Toronto, Toronto, ON, Canada
| | - Yulia Lin
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- University of Toronto Quality in Utilization, Education and Safety in Transfusion Research Program, University of Toronto, Toronto, ON, Canada
- Precision Diagnostics and Therapeutics Program, Sunnybrook Health Sciences Centre, Toronto, Canada
| | - Jeannie Callum
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- University of Toronto Quality in Utilization, Education and Safety in Transfusion Research Program, University of Toronto, Toronto, ON, Canada
- Department of Pathology and Molecular Medicine, Kingston Health Sciences Centre and Queen’s University, Kingston, ON, Canada
| | - Lazaro Gil Gonzalez
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- Toronto Platelet Immunobiology Group, Toronto, ON, Canada
| | - Yuexin Shan
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- Toronto Platelet Immunobiology Group, Toronto, ON, Canada
| | - Donald R. Branch
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- University of Toronto Quality in Utilization, Education and Safety in Transfusion Research Program, University of Toronto, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
- Division of Hematology, Department of Medicine, University of Toronto, Toronto, ON, Canada
| | - Alan H. Lazarus
- Innovation and Portfolio Management, Canadian Blood Services, Toronto, ON, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada
- Keenan Research Centre for Biomedical Science, Li Ka Shing Knowledge Institute, St. Michael’s Hospital, Unity Health Toronto, Toronto, ON, Canada
- Toronto Platelet Immunobiology Group, Toronto, ON, Canada
- University of Toronto Quality in Utilization, Education and Safety in Transfusion Research Program, University of Toronto, Toronto, ON, Canada
- Department of Medicine, University of Toronto, Toronto, ON, Canada
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4
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Porcino GN, Bladergroen MR, Dotz V, Nicolardi S, Memarian E, Gardinassi LG, Nery Costa CH, Pacheco de Almeida R, Ferreira de Miranda Santos IK, Wuhrer M. Total serum N-glycans mark visceral leishmaniasis in human infections with Leishmania infantum. iScience 2023; 26:107021. [PMID: 37485378 PMCID: PMC10362369 DOI: 10.1016/j.isci.2023.107021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2023] [Revised: 04/07/2023] [Accepted: 05/30/2023] [Indexed: 07/25/2023] Open
Abstract
Visceral leishmaniasis (VL) is a clinical form of leishmaniasis with high mortality rates when not treated. Diagnosis suffers from invasive techniques and sub-optimal sensitivities. The current (affordable) treatment with pentavalent antimony as advised by the WHO is possibly harmful to the patient. There is need for an improved diagnosis to prevent possibly unnecessary treatment. N-glycan analysis may aid in diagnosis. We evaluated the N-glycan profiles from active VL, asymptomatic infections (ASYMP) and controls from non-endemic (NC) and endemic (EC) areas. Active VL has a distinct N-glycome profile that associates with disease severity. Our study suggests that the observed glycan signatures could be a valuable additive to diagnosis and assist in identifying possible markers of disease and understanding the pathogenesis of VL. Further studies are warranted to assess a possible future role of blood glycome analysis in active VL diagnosis and should aim at disease specificity.
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Affiliation(s)
- Gabriane Nascimento Porcino
- Departamento de Bioquímica e Imunologia, Faculdade de Medicina de Ribeirão Preto, Universidade de São Paulo, Ribeirão Preto 14049-900, Brazil
| | - Marco René Bladergroen
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden 2333 ZA, the Netherlands
| | - Viktoria Dotz
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden 2333 ZA, the Netherlands
| | - Simone Nicolardi
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden 2333 ZA, the Netherlands
| | - Elham Memarian
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden 2333 ZA, the Netherlands
| | - Luiz Gustavo Gardinassi
- Instituto de Patologia Tropical e Saúde Pública, Universidade Federal de Goiás, Goiânia 74605-050, Brazil
| | | | - Roque Pacheco de Almeida
- Departamento de Medicina, Programa de Pós-Graduação em Ciências da Saúde – PPGCS, Universidade Federal de Sergipe, Aracajú 49060-100, Brazil
| | | | - Manfred Wuhrer
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden 2333 ZA, the Netherlands
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5
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Haslund-Gourley BS, Wigdahl B, Comunale MA. IgG N-glycan Signatures as Potential Diagnostic and Prognostic Biomarkers. Diagnostics (Basel) 2023; 13:diagnostics13061016. [PMID: 36980324 PMCID: PMC10047871 DOI: 10.3390/diagnostics13061016] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Revised: 03/02/2023] [Accepted: 03/05/2023] [Indexed: 03/30/2023] Open
Abstract
IgG N-glycans are an emerging source of disease-specific biomarkers. Over the last decade, the continued development of glycomic databases and the evolution of glyco-analytic methods have resulted in increased throughput, resolution, and sensitivity. IgG N-glycans promote adaptive immune responses through antibody-dependent cellular cytotoxicity (ADCC) and complement activation to combat infection or cancer and promote autoimmunity. In addition to the functional assays, researchers are examining the ability of protein-specific glycosylation to serve as biomarkers of disease. This literature review demonstrates that IgG N-glycans can discriminate between healthy controls, autoimmune disease, infectious disease, and cancer with high sensitivity. The literature also indicates that the IgG glycosylation patterns vary across disease state, thereby supporting their role as specific biomarkers. In addition, IgG N-glycans can be collected longitudinally from patients to track treatment responses or predict disease reoccurrence. This review focuses on IgG N-glycan profiles applied as diagnostics, cohort discriminators, and prognostics. Recent successes, remaining challenges, and upcoming approaches are critically discussed.
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Affiliation(s)
- Benjamin S Haslund-Gourley
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
- Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Brian Wigdahl
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
- Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
| | - Mary Ann Comunale
- Department of Microbiology and Immunology, Drexel University College of Medicine, Philadelphia, PA 19129, USA
- Institute for Molecular Medicine and Infectious Disease, Drexel University College of Medicine, Philadelphia, PA 19129, USA
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6
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Font G, Walet-Balieu ML, Petit M, Burel C, Maho-Vaillant M, Hébert V, Chan P, Fréret M, Boyer O, Joly P, Calbo S, Bardor M, Golinski ML. IgG N-Glycosylation from Patients with Pemphigus Treated with Rituximab. Biomedicines 2022; 10:biomedicines10081774. [PMID: 35892674 PMCID: PMC9330150 DOI: 10.3390/biomedicines10081774] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Revised: 06/27/2022] [Accepted: 07/18/2022] [Indexed: 12/12/2022] Open
Abstract
Pemphigus is a life-threatening auto-immune blistering disease of the skin and mucous membrane that is caused by the production of auto-antibodies (auto-Abs) directed against adhesion proteins: desmoglein 1 and 3. We demonstrated in the “Ritux3” trial, the high efficacy of rituximab, an anti-CD20 recombinant monoclonal antibody, as the first-line treatment for pemphigus. However, 25% of patients relapsed during the six-month period after rituximab treatment. These early relapses were associated with a lower decrease in anti-desmoglein auto-Abs after the initial cycle of rituximab. The N-glycosylation of immunoglobulin-G (IgG) can affect their affinity for Fc receptors and their serum half-life. We hypothesized that the extended half-life of Abs could be related to modifications of IgG N-glycans. The IgG N-glycome from pemphigus patients and its evolution under rituximab treatment were analyzed. Pemphigus patients presented a different IgG N-glycome than healthy donors, with less galactosylated, sialylated N-glycans, as well as a lower level of N-glycans bearing an additional N-acetylglucosamine. IgG N-glycome from patients who achieved clinical remission was not different to the one observed at baseline. Moreover, our study did not identify the N-glycans profile as discriminating between relapsing and non-relapsing patients. We report that pemphigus patients present a specific IgG N-glycome. The changes observed in these patients could be a biomarker of autoimmunity susceptibility rather than a sign of inflammation.
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Affiliation(s)
- Guillaume Font
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Dermatology, F-76000 Rouen, France; (G.F.); (M.M.-V.); (V.H.); (P.J.)
| | - Marie-Laure Walet-Balieu
- Université de Rouen Normandie, Laboratoire Glyco-MEV UR 4358, SFR Normandie Végétal FED 4277, Innovation Chimie Carnot, F-76000 Rouen, France; (M.-L.W.-B.); (C.B.); (M.B.)
| | - Marie Petit
- Université de Rouen Normandie, Inserm U1234, F-76000 Rouen, France; (M.P.); (S.C.)
| | - Carole Burel
- Université de Rouen Normandie, Laboratoire Glyco-MEV UR 4358, SFR Normandie Végétal FED 4277, Innovation Chimie Carnot, F-76000 Rouen, France; (M.-L.W.-B.); (C.B.); (M.B.)
| | - Maud Maho-Vaillant
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Dermatology, F-76000 Rouen, France; (G.F.); (M.M.-V.); (V.H.); (P.J.)
| | - Vivien Hébert
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Dermatology, F-76000 Rouen, France; (G.F.); (M.M.-V.); (V.H.); (P.J.)
| | - Philippe Chan
- Université de Rouen Normandie, INSERM US 51, CNRS UAR 2026, HeRacLeS-PISSARO, Normandie Université, F-76000 Rouen, France;
| | - Manuel Fréret
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Rhumatology, F-76000 Rouen, France;
| | - Olivier Boyer
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Immunology and Biotherapy, F-76000 Rouen, France;
| | - Pascal Joly
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Dermatology, F-76000 Rouen, France; (G.F.); (M.M.-V.); (V.H.); (P.J.)
| | - Sébastien Calbo
- Université de Rouen Normandie, Inserm U1234, F-76000 Rouen, France; (M.P.); (S.C.)
| | - Muriel Bardor
- Université de Rouen Normandie, Laboratoire Glyco-MEV UR 4358, SFR Normandie Végétal FED 4277, Innovation Chimie Carnot, F-76000 Rouen, France; (M.-L.W.-B.); (C.B.); (M.B.)
- Université de Lille, CNRS, UMR 8576-UGSF-Unité de Glycobiologie Structurale et Fonctionnelle, F-59000 Lille, France
| | - Marie-Laure Golinski
- Université de Rouen Normandie, Inserm U1234, CHU Rouen, Department of Dermatology, F-76000 Rouen, France; (G.F.); (M.M.-V.); (V.H.); (P.J.)
- Correspondence: ; Tel.: +33-2-35-14-83-49
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Trzos S, Link-Lenczowski P, Sokołowski G, Pocheć E. Changes of IgG N-Glycosylation in Thyroid Autoimmunity: The Modulatory Effect of Methimazole in Graves' Disease and the Association With the Severity of Inflammation in Hashimoto's Thyroiditis. Front Immunol 2022; 13:841710. [PMID: 35370997 PMCID: PMC8965101 DOI: 10.3389/fimmu.2022.841710] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Accepted: 02/18/2022] [Indexed: 01/16/2023] Open
Abstract
The N-glycome of immunoglobulin G (IgG), the most abundant glycoprotein in human blood serum, reflects pathological conditions of autoimmunity and is sensitive to medicines applied in disease therapy. Due to the high sensitivity of N-glycosylation, the IgG N-glycan profile may serve as an indicator of an ongoing inflammatory process. The IgG structure and its effector functions are strongly dependent on the composition of N-glycans attached to the Fc fragment, and the binding of antigens is regulated by Fab sugar moieties. Because of the crucial role of N-glycans in IgG function, remodeling of its N-oligosaccharides can induce pathological changes that ultimately contribute to the development of autoimmunity; restoration of their physiological structure is critical to the reduction of disease symptoms. Our recently published data have shown that the pathology of autoimmune thyroid diseases (AITDs), including Hashimoto’s thyroiditis (HT) and Graves’ disease (GD), is accompanied by alterations of the composition of IgG N-glycans. The present study is a more in-depth investigation of IgG glycosylation in both AITDs, designed to determine the relationship between the severity of thyroid inflammation and IgG N-glycan structures in HT, and to assess the impact of immunosuppressive therapy on the N-glycan profile in GD patients. The study material consisted of human serum samples collected from donors with elevated anti-thyroglobulin (Tg) and/or anti-thyroperoxidase (TPO) IgGs without symptoms of hypothyroidism (n=68), HT patients characterized by high autoantibody titers and advanced destruction of the thyroid gland (n=113), GD patients with up-regulated IgG against thyroid-stimulating hormone receptor (TSHR) before (n=62) and after (n=47) stabilization of TSH level as a result of methimazole therapy (study groups), and healthy donors (control group, n=90). IgG was isolated from blood serum using protein G affinity chromatography. N-glycans were released from IgG by PNGase F digestion and analyzed by ultra-performance liquid chromatography-mass spectrometry (UPLC-MS) after 2-aminobenzamide (2-AB) labeling. UPLC-MS chromatograms were integrated into 25 peaks (GP) in the Waters UNIFI Scientific Information System, and N-glycans were assigned based on the glucose unit values and mass-to-charge ratios (m/z) of the detected ions. The Kruskal-Wallis non-parametric test was used to determine the statistical significance of the results (p<0.05). The obtained results suggest that modifications of IgG sialylation, galactosylation and core-fucosylation are associated with the severity of HT symptoms. Methimazole therapy implemented in GD patients affected the IgG N-glycan profile; as a result, the content of the sialylated and galactosylated oligosaccharides with core fucose differed after treatment. Our results suggest that N-glycosylation of IgG undergoes dynamic changes during the intensification of thyroiditis in HT, and that in GD autoimmunity it is affected significantly by immunosuppressive therapy.
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Affiliation(s)
- Sara Trzos
- Department of Glycoconjugate Biochemistry, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Kraków, Poland
| | - Paweł Link-Lenczowski
- Department of Medical Physiology, Faculty of Health Sciences, Jagiellonian University Medical College, Kraków, Poland
| | - Grzegorz Sokołowski
- Department of Endocrinology, Faculty of Medicine, Jagiellonian University Medical College, Kraków, Poland
| | - Ewa Pocheć
- Department of Glycoconjugate Biochemistry, Institute of Zoology and Biomedical Research, Faculty of Biology, Jagiellonian University, Kraków, Poland
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8
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Wang W, Xu X, Huang C, Gao C. N-glycan profiling alterations of serum and immunoglobulin G in immune thrombocytopenia. J Clin Lab Anal 2021; 36:e24201. [PMID: 34957618 PMCID: PMC8842136 DOI: 10.1002/jcla.24201] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2021] [Revised: 12/06/2021] [Accepted: 12/15/2021] [Indexed: 11/18/2022] Open
Abstract
Background The glycosylation alterations of serum and IgG are involved in a variety of autoimmune and inflammatory diseases and have shown great potential in biomarker field. The diagnosis of immune thrombocytopenia (ITP) is exclusive. Our study aimed to discover the potential glyco‐biomarkers for auxiliary diagnosis of ITP. Methods The serum samples were obtained from 61 ITP patients and 35 healthy controls, and IgG samples were purified from 34 out of 61 ITP patients and 35 healthy controls. DNA sequencer‐assisted fluorophore‐assisted carbohydrate electrophoresis (DSA‐FACE) was used to analyze serum and IgG N‐glycan profiling. Results 6 of 12 serum N‐glycan peaks, 6 of 7 IgG N‐glycan peaks, serum fucosylation, and IgG galactosylation were significantly different between ITP patients and healthy controls (p < 0.05). IgG peak 7 showed good diagnostic efficacy for discriminating ITP patients from healthy individuals (AUC 0.967). ITP patients with severe thrombocytopenia had a significantly lower serum fucosylation than ITP patients with mild and moderate thrombocytopenia (p < 0.05). Serum fucosylation and serum peak 5 were correlated with platelet counts in ITP patients with severe thrombocytopenia, and the absolute values of correlation coefficient were both over 0.5. Conclusions The specific N‐glycan patterns of serum and IgG were observed in ITP patients. IgG peak 7 was a potential biomarker for auxiliary diagnosis of ITP.
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Affiliation(s)
- Wei Wang
- Clinical Laboratory Medicine Center, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China
| | - Xuewen Xu
- Department of Laboratory Medicine, Shanghai Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Chenjun Huang
- Clinical Laboratory Medicine Center, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.,Department of Laboratory Medicine, Shanghai Eastern Hepatobiliary Surgery Hospital, Shanghai, China
| | - Chunfang Gao
- Clinical Laboratory Medicine Center, Yueyang Hospital of Integrated Traditional Chinese and Western Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, China.,Department of Laboratory Medicine, Shanghai Eastern Hepatobiliary Surgery Hospital, Shanghai, China
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Wojcik I, Schmidt DE, de Neef LA, Rab MAE, Meek B, de Weerdt O, Wuhrer M, van der Schoot CE, Zwaginga JJ, de Haas M, Falck D, Vidarsson G. A functional spleen contributes to afucosylated IgG in humans. Sci Rep 2021; 11:24045. [PMID: 34911982 PMCID: PMC8674363 DOI: 10.1038/s41598-021-03196-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Accepted: 11/23/2021] [Indexed: 12/12/2022] Open
Abstract
As a lymphoid organ, the spleen hosts a wide range of immune cell populations, which not only remove blood-borne antigens, but also generate and regulate antigen-specific immune responses. In particular, the splenic microenvironment has been demonstrated to play a prominent role in adaptive immune responses to enveloped viral infections and alloantigens. During both types of immunizations, antigen-specific immunoglobulins G (IgGs) have been characterized by the reduced amount of fucose present on N-linked glycans of the fragment crystallizable (Fc) region. These glycans are essential for mediating the induction of immune effector functions. Therefore, we hypothesized that a spleen may modulate humoral responses and serve as a preferential site for afucosylated IgG responses, which potentially play a role in immune thrombocytopenia (ITP) pathogenesis. To determine the role of the spleen in IgG-Fc glycosylation, we performed IgG subclass-specific liquid chromatography-mass spectrometry (LC-MS) analysis of Fc glycosylation in a large cohort of individuals splenectomized due to trauma, due to ITP, or spherocytosis. IgG-Fc fucosylation was consistently increased after splenectomy, while no effects for IgG-Fc galactosylation and sialylation were observed. An increase in IgG1- and IgG2/3-Fc fucosylation level upon splenectomy has been reported here for the first time, suggesting that immune responses occurring in the spleen may be particularly prone to generate afucosylated IgG responses. Surprisingly, the level of total IgG-Fc fucosylation was decreased in ITP patients compared to healthy controls. Overall, our results suggest a yet unrecognized role of the spleen in either the induction or maintenance of afucosylated IgG responses by B cells.
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Affiliation(s)
- Iwona Wojcik
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands.
- Glycoscience Research Laboratory, Genos Ltd., Zagreb, Croatia.
| | - David E Schmidt
- Department of Experimental Immunohematology, Sanquin, Amsterdam, The Netherlands
| | - Lisa A de Neef
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Minke A E Rab
- Department of Central Diagnostic Laboratory-Research, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
- Department of Hematology, University Medical Center Utrecht, Utrecht University, Utrecht, The Netherlands
| | - Bob Meek
- Department of Medical Microbiology and Immunology, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - Okke de Weerdt
- Department of Internal Medicine, St. Antonius Hospital, Nieuwegein, The Netherlands
| | - Manfred Wuhrer
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - C Ellen van der Schoot
- Department of Experimental Immunohematology, Sanquin, Amsterdam, The Netherlands
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Jaap J Zwaginga
- Center for Clinical Transfusion Research, Sanquin Research, Leiden, The Netherlands
- Department of Immune Hematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands
| | - Masja de Haas
- Center for Clinical Transfusion Research, Sanquin Research, Leiden, The Netherlands
- Department of Immune Hematology and Blood Transfusion, Leiden University Medical Center, Leiden, The Netherlands
- Department of Immunohematology Diagnostics, Sanquin, Amsterdam, The Netherlands
| | - David Falck
- Center for Proteomics and Metabolomics, Leiden University Medical Center, Leiden, The Netherlands
| | - Gestur Vidarsson
- Department of Experimental Immunohematology, Sanquin, Amsterdam, The Netherlands.
- Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, The Netherlands.
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10
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Wang T, He X, Ran N, Liu C, Xing L, Wang H, Fu R, Shao Z. Immunological characteristics and effect of cyclosporin in patients with immune thrombocytopenia. J Clin Lab Anal 2021; 35:e23922. [PMID: 34329516 PMCID: PMC8418498 DOI: 10.1002/jcla.23922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2021] [Revised: 07/12/2021] [Accepted: 07/12/2021] [Indexed: 12/15/2022] Open
Abstract
Objective Immune thrombocytopenia (ITP) is well‐known as an antibody‐mediated autoimmune disease, and it is easy to get response but often turns to relapse or refractory. Cyclosporin is a traditional immunosuppressant and had a good effect on ITP patients. In this paper, we retrospectively analyze the immunological characteristics and therapeutic effect of cyclosporin in 220 patients with ITP. Methods All newly diagnosed ITP patients in the Department of Hematology, Tianjin Medical University General Hospital from June 2018 to December 2020 were enrolled and divided into four groups according to the expression of autoantibodies and the occurrence of prodromal infection. The basic data and immune indexes of ITP patients in each group were collected. The clinical immunological characteristics of patients in each group and the therapeutic effect of cyclosporin in each group were analyzed. Results Multi‐autoantibody ITP patients were more likely to have low serum albumin and high gamma globulin, and the ratio of albumin to globulin decreased. In addition, the level of IgA and IgG increased and the level of complement C3 and C4 decreased more frequently than those in other groups. The number of CD3+T lymphocytes, especially CD3+CD4+T lymphocytes, decreased in ANA+ITP patients. The number of CD16+CD56+NK cells, pDC/DC ratio, and pDC/mDC ratio were higher than those in other groups. The expression of IL‐6 and the proportion of CD19+B lymphocytes increased in two groups of ITP patients with abnormal autoantibodies. The patients of pro‐infected group were more likely to suffer from coagulation disorder. After treatment with cyclosporin, the response rate increased and the 3‐month relapse rate decreased in all ITP patients, and the therapeutic effect of patients with high megakaryocyte number was significantly higher than that of patients with low megakaryocyte number. The impact factors that influence the effect of glucocorticoid and(or) IVIG were the number of CD3+CD8+T lymphocytes, CD4/CD8 cell ratio, and the number of CD19+B lymphocytes. The independent impact factor of cyclosporin therapeutic response rate was the number of CD3+T lymphocytes. Conclusions ITP is a heterogeneous disease, recurrence may occur during or rapidly after treatment.
Cyclosporine included treatment can improve the effective rate of ITP and
reduce the relapse rate within 3 months. The number of CD3+T lymphocytes was
the only impact factor that influence the therapeutic effect of
cyclosporin in ITP patients.
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Affiliation(s)
- Ting Wang
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Xin He
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Ningyuan Ran
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Chunyan Liu
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Limin Xing
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Huaquan Wang
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Rong Fu
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
| | - Zonghong Shao
- Department of Hematology, Tianjin Medical University General Hospital, Heping, Tianjin, China
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11
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Anti-inflammatory activity of CD44 antibodies in murine immune thrombocytopenia is mediated by Fcγ receptor inhibition. Blood 2021; 137:2114-2124. [PMID: 33662988 DOI: 10.1182/blood.2020009497] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2020] [Accepted: 02/11/2021] [Indexed: 02/03/2023] Open
Abstract
Monoclonal immunoglobulin G (IgG) antibodies to CD44 (anti-CD44) are anti-inflammatory in numerous murine autoimmune models, but the mechanisms are poorly understood. Anti-CD44 anti-inflammatory activity shows complete therapeutic concordance with IV immunoglobulin (IVIg) in treating autoimmune disease models, making anti-CD44 a potential IVIg alternative. In murine immune thrombocytopenia (ITP), there is no mechanistic explanation for anti-CD44 activity, although anti-CD44 ameliorates disease similarly to IVIg. Here, we demonstrate a novel anti-inflammatory mechanism of anti-CD44 that explains disease amelioration by anti-CD44 in murine ITP. Macrophages treated with anti-CD44 in vitro had dramatically suppressed phagocytosis through FcγRs in 2 separate systems of IgG-opsonized platelets and erythrocytes. Phagocytosis inhibition by anti-CD44 was mediated by blockade of the FcγR IgG binding site without changing surface FcγR expression. Anti-CD44 of different subclasses revealed that FcγR blockade was specific to receptors that could be engaged by the respective anti-CD44 subclass, and Fc-deactivated anti-CD44 variants lost all FcγR-inhibiting activity. In vivo, anti-CD44 functioned analogously in the murine passive ITP model and protected mice from ITP when thrombocytopenia was induced through an FcγR that could be engaged by the CD44 antibody's subclass. Consistent with FcγR blockade, Fc-deactivated variants of anti-CD44 were completely unable to ameliorate ITP. Together, anti-CD44 inhibits macrophage FcγR function and ameliorates ITP consistent with an FcγR blockade mechanism. Anti-CD44 is a potential IVIg alternative and may be of particular benefit in ITP because of the significant role that FcγRs play in human ITP pathophysiology.
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Koike G, Katz ISS, Fernandes ER, Guedes F, Silva SR. Glycosylation is required for the neutralizing activity of human IgG1 antibodies against human rabies induced by pre-exposure prophylaxis. Immunobiology 2021; 226:152058. [PMID: 33609912 DOI: 10.1016/j.imbio.2021.152058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2020] [Revised: 12/17/2020] [Accepted: 01/11/2021] [Indexed: 11/17/2022]
Abstract
Rabies lyssavirus (RABV) neutralizing IgG antibodies confer protection after rabies vaccination, although how the RABV-specific antibodies neutralize the virus is still unknown. As changes in the antibody's carbohydrate chain can interfere with its effector functions, we compared the glycosylation patterns of both neutralizing and non-neutralizing IgG1 induced by pre-exposure prophylaxis to human rabies and analyzed their influence on in vitro antibody neutralizing activities. Specific IgG1 were purified from human serum using affinity chromatography. Purity and avidity were analyzed by SDS-PAGE and indirect ELISA using NH4SCN respectively. The N-linked oligosaccharide chain of the purified IgG antibody was evaluated using a lectin-based ELISA assay with a panel of seven lectins. The activity of purified IgG1 and neutralizing IgG1 deglycosylated by PNGase F enzyme were analyzed using the rapid fluorescent focus inhibition test. The purified IgG1 showed an electrophoretic pattern compatible with human IgG. All of the antibodies recognized RABV, although neutralizing IgG1 had a higher avidity (RAI = 80%) than non-neutralizing IgG1 (RAI = 30%). The neutralizing IgG1 also showed higher binding to WFA, ECA, WGA, and ConA lectins, indicating possible different N-acetylgalactosamine, galactose, N-acetylglucosamine, and mannose contents. Non-neutralizing IgG1, on the other hand, showed strong binding at UEA-1 and SNA, which bind to fucose and sialic acid residues respectively. Different glycosylation profiles were also observed in Fab and Fc fragments from neutralizing and non-neutralizing IgG1, although the deglycosylated IgG1 lost its neutralizing activity. Our results suggest that antibody glycosylation is important for neutralizing RABV in vitro, since neutralizing IgG1 has a different glycosylation profile than non-neutralizing IgG1. Further research will be needed to better evaluate the differential glycosylation patterns between IgG1 antibodies following vaccination.
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