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Chi X, Gu J, Ma X. Characteristics and Roles of T Follicular Helper Cells in SARS-CoV-2 Vaccine Response. Vaccines (Basel) 2022; 10:vaccines10101623. [PMID: 36298488 PMCID: PMC9611968 DOI: 10.3390/vaccines10101623] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2022] [Revised: 09/26/2022] [Accepted: 09/26/2022] [Indexed: 11/17/2022] Open
Abstract
Severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccination is critical to controlling the coronavirus disease 2019 (COVID-19) pandemic. However, a weak response to the vaccine and insufficient persistence of specific antibodies may threaten the global impact of mass vaccination campaigns. This study summarizes the internal factors of the body that affect the effectiveness of the SARS-CoV-2 vaccine. T follicular helper (Tfh) cells support germinal center B cells to produce vaccine-specific immunoglobulins. A reduction in the Tfh cell number and a shift in the subset phenotypes caused by multiple factors may impair the production and persistence of high-affinity antibodies. Besides efficacy differences caused by the different types of vaccines, the factors that affect vaccine effectiveness by intervening in the Tfh cell response also include age-related defects, the polarity of the body microenvironment, repeated immunization, immunodeficiency, and immunosuppressive treatments. Assessing the phenotypic distribution and activation levels of Tfh cell subsets after vaccination is helpful in predicting vaccine responses and may identify potential targets for improving vaccine effectiveness.
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Affiliation(s)
- Xuyang Chi
- Department of Pediatrics, The First Hospital of China Medical University, Shenyang 110001, China
| | - Jia Gu
- Department of Pediatrics, The First Hospital of China Medical University, Shenyang 110001, China
| | - Xiaoxue Ma
- Department of Pediatrics, The First Hospital of China Medical University, Shenyang 110001, China
- Department of Microbiology & Immunology and Pediatrics, Dalhousie University, and Canadian Center for Vaccinology, IWK Health Centre, Halifax, NS B3K 6R8, Canada
- Correspondence: ; Tel.: +86-024-83282527
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2
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Segmental membranous nephropathy. Clin Exp Nephrol 2021; 25:700-707. [PMID: 33755821 DOI: 10.1007/s10157-021-02056-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2020] [Accepted: 03/17/2021] [Indexed: 10/21/2022]
Abstract
Most cases of membranous nephropathy (MGN) present with global and diffuse distribution of subepithelial deposits. However, segmental MGN, in which there is focal or diffuse segmental subepithelial deposits, are occasionally encountered. The clinical and pathologic significance of segmental MGN is not well understood and thought to be more likely due to either early or resolving phase of the global form of MGN. Several case reports and literature available suggest that it may be a manifestation of secondary causes based on pathologic features such as presence of C1q and mesangial deposits, extra-glomerular deposits involving tubular basement membranes, absence of PLA2R and THSD7A, IgG1 and IgG3 subclass dominance, and the presence of other co-existing renal disease. Other reports, however, suggest that some of these cases may be a variant of the primary form of MGN. In this review, we integrate what is known about segmental MGN in order to better direct interpretation of renal biopsies in which it is identified.
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Napodano C, Marino M, Stefanile A, Pocino K, Scatena R, Gulli F, Rapaccini GL, Delli Noci S, Capozio G, Rigante D, Basile U. Immunological Role of IgG Subclasses. Immunol Invest 2020; 50:427-444. [PMID: 32522062 DOI: 10.1080/08820139.2020.1775643] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The loss of tolerance to self-antigens is the unequivocal "red line" of autoimmunity: both development of autoreactive T and B cells and production of polyclonal autoantibodies represent seminal keys to the pathogenesis of protean autoimmune diseases. Most of these autoantibodies are immunoglobulins G (IgG), functionally distinguished in four subclasses named IgG1, IgG2, IgG3, and IgG4, due to structural differences in the hinge and heavy chain constant regions. Different studies analyzed serum levels of IgG subclasses in the course of different disorders, showing that they might have a pathogenic role by regulating interactions among immunoglobulins, Fc-gamma receptors, and complement. To date, the mechanisms promoting different IgG subclasses distribution during the natural history of most autoimmune diseases remain somewhat unclear. Evidence from the medical literature shows that the serum IgG profile is peculiar for many autoimmune diseases, suggesting that different subclasses could be specific for the underlying driving autoantigens. A better knowledge of IgG subsets may probably help to elucidate their pathological task, but also to define their relevance for diagnostic purposes, patients' personalized management, and prognosis assessment.
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Affiliation(s)
- Cecilia Napodano
- Department of Internal Medicine and Gastroenterology, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - MariaPaola Marino
- Institute of General Pathology, Dipartimento Di Medicina E Chirurgia Traslazionale, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Annunziata Stefanile
- Area Diagnostica di Laboratorio, Fondazione Policlinico Universitario "A. Gemelli", Rome, Italy
| | - Krizia Pocino
- Department of Internal Medicine and Gastroenterology, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Roberto Scatena
- Dipartimento Di Medicina Di Laboratorio, Ospedale Madre Giuseppina Vannini, Rome, Italy
| | - Francesca Gulli
- Dipartimento Di Medicina Di Laboratorio, Ospedale Madre Giuseppina Vannini, Rome, Italy
| | - Gian Lodovico Rapaccini
- Department of Internal Medicine and Gastroenterology, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy.,Università Cattolica del Sacro Cuore, Rome, Italy
| | - Stefano Delli Noci
- Department of Life Sciences and Public Health, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Giovanna Capozio
- Department of Life Sciences and Public Health, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Donato Rigante
- Università Cattolica del Sacro Cuore, Rome, Italy.,Department of Life Sciences and Public Health, Fondazione Policlinico Universitario "A. Gemelli" IRCCS, Rome, Italy
| | - Umberto Basile
- Area Diagnostica di Laboratorio, Fondazione Policlinico Universitario "A. Gemelli", Rome, Italy.,Università Cattolica del Sacro Cuore, Rome, Italy
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Immunoglobulin G and Subclasses as Potential Biomarkers in Metastatic Melanoma Patients Starting Checkpoint Inhibitor Treatment. J Immunother 2020; 42:89-93. [PMID: 30768543 DOI: 10.1097/cji.0000000000000255] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
Checkpoint inhibitors have improved survival of metastatic melanoma. However, reliable biomarkers to predict response are still needed. Immunoglobulin G (IgG) antibody subclasses reflect immunocompetence in individuals and are known to be involved in essential functions in our immune system. This prospective study evaluated the association between serum IgG with its subclasses IgG1, IgG2, IgG3, and IgG4 and antitumor response according to RECIST 1.1. Serum samples from 49 patients were prospectively collected before the start of treatment with a checkpoint inhibitor. We observed a statistically significant association of baseline IgG2 with response to therapy (P=0.011). After defining optimal cutpoints, we found significant associations between total IgG (>9.66 g/L, P=0.038), IgG1 (>6.22 g/L, P=0.025), IgG2 (>2.42 g/L, P=0.019), and IgG3 (>0.21 g/L, P=0.034) with progression-free survival. Prolonged overall survival was associated with elevated IgG2 (>2.42 g/L, P=0.043). Together, these findings define total IgG and subclasses as predictors of clinical successful checkpoint inhibition in metastatic melanoma patients.
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5
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Sentinel biomarkers in HCV positive patients with mixed cryoglobulinemia. J Immunol Methods 2020; 476:112687. [DOI: 10.1016/j.jim.2019.112687] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/23/2019] [Accepted: 10/21/2019] [Indexed: 12/20/2022]
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6
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Lu H, Cui Z, Zhou XJ, Jin QZ, Yu XJ, Wang SX, Wang Y, Zhou FD, Zhao MH. Plasma exchange and rituximab treatments in primary membranous nephropathy combined with crescentic glomerulonephritis: A case report. Medicine (Baltimore) 2019; 98:e15303. [PMID: 31045764 PMCID: PMC6504248 DOI: 10.1097/md.0000000000015303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
RATIONALE Crescent formation is rare in primary membranous nephropathy (MN). Anti-phospholipase A2 receptor (PLA2R) antibodies are detectable in these patients. The mechanism and treatments are unknown. PATIENT CONCERNS A 72-year-old female patient who presented with nephrotic syndrome, hematuria, and rapidly progressive kidney dysfunction. DIAGNOSES Kidney biopsy was performed and the diagnosis was MN in combination with crescentic glomerulonephritis. Circulating anti-PLA2R IgG3 and IgG4 were detected of high level. INTERVENTIONS The patient received plasma exchange and rituximab besides corticosteroids. OUTCOMES The patient achieved complete remission of proteinuria and recovery of kidney function after the clearance of anti-PLA2R antibodies. LESSON This case suggests a pathogenic role of anti-PLA2R antibodies in the mechanism of crescent formation in MN, which may need intensive therapy to eliminate the antibodies quickly.
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MESH Headings
- Aged
- Female
- Glomerulonephritis, Membranoproliferative/blood
- Glomerulonephritis, Membranoproliferative/drug therapy
- Glomerulonephritis, Membranoproliferative/immunology
- Glomerulonephritis, Membranoproliferative/pathology
- Glomerulonephritis, Membranous/blood
- Glomerulonephritis, Membranous/drug therapy
- Glomerulonephritis, Membranous/immunology
- Glomerulonephritis, Membranous/pathology
- Hematuria/diagnosis
- Hematuria/etiology
- Humans
- Immunoglobulin G/blood
- Immunologic Factors/therapeutic use
- Kidney/pathology
- Kidney/physiopathology
- Nephrotic Syndrome/pathology
- Plasma Exchange/methods
- Proteinuria/pathology
- Receptors, Phospholipase A2/antagonists & inhibitors
- Receptors, Phospholipase A2/immunology
- Remission Induction
- Rituximab/administration & dosage
- Rituximab/therapeutic use
- Treatment Outcome
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Affiliation(s)
- Hui Lu
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Zhao Cui
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Xu-jie Zhou
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Qi-zhuang Jin
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Xiao-juan Yu
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Su-xia Wang
- Electron Microscopy Laboratory, Peking University First Hospital
| | - Yu Wang
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Fu-de Zhou
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
| | - Ming-hui Zhao
- Renal Division, Department of Medicine, Peking University First Hospital
- Institute of Nephrology, Peking University
- Key Laboratory of Renal Disease, Ministry of Health of China
- Key Laboratory of CKD Prevention and Treatment, Ministry of Education of China
- Peking-Tsinghua Center for Life Sciences, Beijing, China
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Zhao C, Gao Y, Yu N, Li T, Zhang Y, Zhang H, Lu G, Gao Y, Guo X. Unidirectional transport of IgG by neonatal Fc receptor in human thyrocytes varies across different IgG subclasses. Mol Cell Endocrinol 2018; 477:103-111. [PMID: 29908223 DOI: 10.1016/j.mce.2018.06.006] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2018] [Revised: 05/22/2018] [Accepted: 06/11/2018] [Indexed: 10/14/2022]
Abstract
Neonatal Fc receptor (FcRn) is down-regulated in Hashimoto's thyroiditis (HT) thyrocytes and mediates IgG endocytosis in thyrocytes. The serum distribution of IgG subclasses (of TgAb and TPOAb) differs between HT patients and normal individuals. We aimed to explore the direction and regulation of FcRn-mediated IgG transport in thyrocyte monolayers and the difference between various IgG subclass transport. IgG was transported by FcRn from the basolateral to apical side in the thyrocyte monolayers grown on Transwell filters and the transport was inhibited by IFN-γ and TNF-α. Stimulation by T3 and TSH down-regulated FcRn expression in thyrocytes. IgG1 was transported preferentially over IgG2 and IgG4, which might be related to the differences in FcRn-binding affinities as shown by SPR. FcRn mediates unidirectional IgG transport in thyrocytes in a tissue-specific manner. Down-regulation of FcRn is speculated to play a protective role in HT pathogenesis by mainly reducing IgG1 transport in thyrocytes.
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Affiliation(s)
- Chenxu Zhao
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Ying Gao
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Nan Yu
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Tiancheng Li
- Department of Otorhinolaryngology-Head and Neck Surgery, Peking University First Hospital, Beijing, 100034, China; Centre for Cancer Research, Massachusetts General Hospital, Boston, MA, 02129, USA
| | - Yang Zhang
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China.
| | - Hong Zhang
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Guizhi Lu
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Yanming Gao
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
| | - Xiaohui Guo
- Department of Endocrinology, Peking University First Hospital, Beijing, 100034, China
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8
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Mauch RM, Jensen PØ, Moser C, Levy CE, Høiby N. Mechanisms of humoral immune response against Pseudomonas aeruginosa biofilm infection in cystic fibrosis. J Cyst Fibros 2017; 17:143-152. [PMID: 29033275 DOI: 10.1016/j.jcf.2017.08.012] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 08/21/2017] [Accepted: 08/22/2017] [Indexed: 12/11/2022]
Abstract
P. aeruginosa chronic lung infection is the major cause of morbidity and mortality in patients with cystic fibrosis (CF), and is characterized by a biofilm mode of growth, increased levels of specific IgG antibodies and immune complex formation. However, despite being designed to combat this infection, such elevated humoral response is not associated with clinical improvement, pointing to a lack of anti-pseudomonas effectiveness. The mode of action of specific antibodies, as well as their structural features, and even the background involving B-cell production, stimulation and differentiation into antibody-producing cells in the CF airways are poorly understood. Thus, the aim of this review is to discuss studies that have addressed the intrinsic features of the humoral immune response and provide new insights regarding its insufficiency in the CF context.
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Affiliation(s)
- Renan Marrichi Mauch
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas, Brazil
| | - Peter Østrup Jensen
- Department of International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, Panum Institute, University of Copenhagen, Denmark
| | - Claus Moser
- Department of Clinical Microbiology, Rigshospitalet (Copenhagen University Hospital), Denmark
| | - Carlos Emilio Levy
- Department of Clinical Pathology, School of Medical Sciences, University of Campinas, Brazil; Laboratory of Microbiology, Division of Clinical Pathology, Hospital de Clínicas (Campinas University Hospital), Brazil
| | - Niels Høiby
- Department of International Health, Immunology and Microbiology, Faculty of Health and Medical Sciences, Panum Institute, University of Copenhagen, Denmark; Department of Clinical Microbiology, Rigshospitalet (Copenhagen University Hospital), Denmark.
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9
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Peacock ME, Arce RM, Cutler CW. Periodontal and other oral manifestations of immunodeficiency diseases. Oral Dis 2017; 23:866-888. [PMID: 27630012 PMCID: PMC5352551 DOI: 10.1111/odi.12584] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2016] [Revised: 08/31/2016] [Accepted: 09/08/2016] [Indexed: 12/14/2022]
Abstract
The list of immunodeficiency diseases grows each year as novel disorders are discovered, classified, and sometimes reclassified due to our ever-increasing knowledge of immune system function. Although the number of patients with secondary immunodeficiencies (SIDs) greatly exceeds those with primary immunodeficiencies (PIDs), the prevalence of both appears to be on the rise probably because of scientific breakthroughs that facilitate earlier and more accurate diagnosis. Primary immunodeficiencies in adults are not as rare as once thought. Globally, the main causes of secondary immunodeficiency are HIV infection and nutritional insufficiencies. Persons with acquired immune disorders such as AIDS caused by the human immunodeficiency virus (HIV) are now living long and fulfilling lives as a result of highly active antiretroviral therapy (HAART). Irrespective of whether the patient's immune-deficient state is a consequence of a genetic defect or is secondary in nature, dental and medical practitioners must be aware of the constant potential for infections and/or expressions of autoimmunity in these individuals. The purpose of this review was to study the most common conditions resulting from primary and secondary immunodeficiency states, how they are classified, and the detrimental manifestations of these disorders on the periodontal and oral tissues.
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Affiliation(s)
- Mark E Peacock
- Associate Professor, Departments of Periodontics, Oral Biology
| | - Roger M. Arce
- Assistant Professor, Departments of Periodontics, Oral Biology
| | - Christopher W Cutler
- Professor, Departments of Periodontics, Oral Biology; Chair, Department of Periodontics, Associate Dean for Research, The Dental College of Georgia at Augusta University
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10
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Abstract
Immunoglobulin G4-related lymphadenopathy (IgG4-RLAD) occurs in the setting of extranodal IgG4-related disease (IgG4-RD), an immune-mediated process described in many organ systems characterized by lymphoplasmacytic infiltrates with abundant IgG4-positive plasma cells and fibrosis. Although the morphologic features in the lymph node sometimes resemble those seen at the extranodal sites, 5 microscopic patterns have been described, most of which resemble reactive lymphoid hyperplasia. This morphologic variability leads to unique diagnostic challenges and a broad differential diagnosis. As IgG4-RD may be exquisitely responsive to steroids or other immunotherapy, histologic recognition and inclusion of IgG4-RLAD in the differential diagnosis is vital.
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Affiliation(s)
- Christine E Bookhout
- Department of Pathology and Laboratory Medicine, University of North Carolina, Campus Box 7525, Brinkhous-Bullitt Building, Chapel Hill, NC 27599-7525, USA
| | - Marian A Rollins-Raval
- Department of Pathology and Laboratory Medicine, University of North Carolina, Campus Box 7525, Brinkhous-Bullitt Building, Chapel Hill, NC 27599-7525, USA.
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11
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Macchiaverni P, Ynoue LH, Arslanian C, Verhasselt V, Condino-Neto A. Early Exposure to Respiratory Allergens by Placental Transfer and Breastfeeding. PLoS One 2015; 10:e0139064. [PMID: 26398234 PMCID: PMC4580413 DOI: 10.1371/journal.pone.0139064] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2015] [Accepted: 09/06/2015] [Indexed: 02/05/2023] Open
Abstract
The relationship between allergen exposure and the onset of or protection from allergic diseases remains unclear. Many factors could be related to immunological responses, such as the age when the exposure occurs, type of allergen, timing, dose, and allergen route. In this study, we investigated whether exposure to respiratory allergens could occur in pregnancy or early life. In particular, we assessed whether Der p 1 and Blo t 5, as well as specific antibodies against these allergens, could be detected in 90 paired cord blood and colostrum samples. Der p 1 was detected in 58.6% of colostrum and 29% of cord blood samples, whereas Blot 5 was positive in 41.3% and 9.6% of the samples, respectively. Similar to specific IgA, which could be detected in all samples for both mites, specific IgG was found in a high number of colostrum samples, 93.5% and 94.8% for Dp and Bt, respectively. Although allergens were not detected in all cord blood samples, a high percentage of them (≥95%) were positive for specific IgM to both mites in cord blood samples, suggesting that neonates can be exposed and sensitized to airborne allergens during pregnancy. Many studies have attempted to correlate allergen exposure or its prevention in early infancy with the onset of or protection from allergic diseases. However, conflicting and inconsistent data do not show a clear correlation with or suggest a way to prevent allergen sensitization. Nevertheless, these unconvincing results could be better understood if the relationship with many aspects of allergen exposure after pregnancy could be clarified. Thus, it is necessary to address basic issues related to allergen exposure, including the development of reproducible, standardized and reliable methods, and to determine how and where the exposure occurs.
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Affiliation(s)
- Patricia Macchiaverni
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Leandro H. Ynoue
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Christina Arslanian
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Valérie Verhasselt
- Institut National de la Santé et de la Recherche Médicale (INSERM), U924 Université de Nice-Sophia Antipolis, Valbonne, France
| | - Antonio Condino-Neto
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
- * E-mail:
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AAV liver expression of FIX-Padua prevents and eradicates FIX inhibitor without increasing thrombogenicity in hemophilia B dogs and mice. Blood 2015; 125:1553-61. [PMID: 25568350 DOI: 10.1182/blood-2014-07-588194] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Emerging successful clinical data on gene therapy using adeno-associated viral (AAV) vector for hemophilia B (HB) showed that the risk of cellular immune response to vector capsid is clearly dose dependent. To decrease the vector dose, we explored AAV-8 (1-3 × 10(12) vg/kg) encoding a hyperfunctional factor IX (FIX-Padua, arginine 338 to leucine) in FIX inhibitor-prone HB dogs. Two naïve HB dogs showed sustained expression of FIX-Padua with an 8- to 12-fold increased specific activity reaching 25% to 40% activity without antibody formation to FIX. A third dog with preexisting FIX inhibitors exhibited a transient anamnestic response (5 Bethesda units) at 2 weeks after vector delivery following by spontaneous eradication of the antibody to FIX by day 70. In this dog, sustained FIX expression reached ∼200% and 30% of activity and antigen levels, respectively. Immune tolerance was confirmed in all dogs after challenges with plasma-derived FIX concentrate. Shortening of the clotting times and lack of bleeding episodes support the phenotypic correction of the severe phenotype, with no clinical or laboratory evidence of risk of thrombosis. Provocative studies in mice showed that FIX-Padua exhibits similar immunogenicity and thrombogenicity compared with FIX wild type. Collectively, these data support the potential translation of gene-based strategies using FIX-Padua for HB.
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13
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Zhang H, Li P, Wu D, Xu D, Hou Y, Wang Q, Li M, Li Y, Zeng X, Zhang F, Shi Q. Serum IgG subclasses in autoimmune diseases. Medicine (Baltimore) 2015; 94:e387. [PMID: 25590841 PMCID: PMC4602543 DOI: 10.1097/md.0000000000000387] [Citation(s) in RCA: 72] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
To characterize serum IgG subclass levels in several autoimmune diseases, including primary Sjogren syndrome (pSS), systemic sclerosis (SSc), systemic lupus erythematosus (SLE), and primary biliary cirrhosis (PBC). We aimed to analyze serum IgG subclass distribution and to test whether serum IgG4 levels are elevated in these diseases. Serum IgG subclass levels from 102 pSS, 102 SSc, 100 SLE, and 59 PBC patients, as well as 40 healthy controls (HCs), were measured using the immunonephelometric assay. The distribution of IgG subclasses among these autoimmune diseases was analyzed. In this cross-sectional study, serum IgG1 (IgG1/IgG) and/or IgG3 (IgG3/IgG) were significantly increased, compared with those in HCs. Only 6.34% of patients had levels of serum IgG4 >135 mg/dL. There were no significant differences in the frequency of elevated serum IgG4 levels between patients and HC. In pSS, serum IgG1 levels were much higher than those in other disease groups, whereas serum IgG2 and IgG3 levels were most prominently increased in PBC. A strikingly different serum IgG subclass distribution was detected in patients with autoimmune diseases compared with HCs. Serum IgG subclass levels also showed distinct characteristics among different autoimmune diseases. Serum IgG4 levels in these patients were lower or not much higher than those in HCs, which differed from IgG4-related diseases.
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Affiliation(s)
- Haoze Zhang
- From the Department of Rheumatology, Peking Union Medical College Hospital, Chinese Academy of Medical Science and Peking Union Medical College, Beijing, China
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14
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IgG4 subclass-specific responses to Staphylococcus aureus antigens shed new light on host-pathogen interaction. Infect Immun 2014; 83:492-501. [PMID: 25404029 DOI: 10.1128/iai.02286-14] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
IgG4 responses are considered indicative for long-term or repeated exposure to particular antigens. Therefore, studying IgG4-specific antibody responses against Staphylococcus aureus might generate new insights into the respective host-pathogen interactions and the microbial virulence factors involved. Using a bead-based flow cytometry assay, we determined total IgG (IgGt), IgG1, and IgG4 antibody responses to 40 different S. aureus virulence factors in sera from healthy persistent nasal carriers, healthy persistent noncarriers, and patients with various staphylococcal infections from three distinct countries. IgGt responses were detected against all tested antigens. These were mostly IgG1 responses. In contrast, IgG4 antibodies were detected to alpha-toxin, chemotaxis inhibitory protein of S. aureus (CHIPS), exfoliative toxins A and B (ETA and -B), HlgB, IsdA, LukD, -E, -F, and -S, staphylococcal complement inhibitor (SCIN), staphylococcal enterotoxin C (SEC), staphylococcal superantigen-like proteins 1, 3, 5, and 9 (SSL1, -3, -5, and -9), and toxic shock syndrome toxin 1 (TSST-1) only. Large interpatient variability was observed, and the type of infection or geographical location did not reveal conserved patterns of response. As persistent S. aureus carriers trended toward IgG4 responses to a larger number of antigens than persistent noncarriers, we also investigated sera from patients with epidermolysis bullosa (EB), a genetic blistering disease associated with high S. aureus carriage rates. EB patients responded immunologically to significantly more antigens than noncarriers and trended toward even more responses than carriers. Altogether, we conclude that the IgG4 responses against a restricted panel of staphylococcal antigens consisting primarily of immune modulators and particular toxins indicate important roles for these virulence factors in staphylococcal pathogen-host interactions, such as chronicity of colonization and/or (subclinical) infections.
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The maturation of antibody technology for the HIV epidemic. Immunol Cell Biol 2014; 92:570-7. [DOI: 10.1038/icb.2014.35] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2014] [Revised: 03/30/2014] [Accepted: 03/30/2014] [Indexed: 01/15/2023]
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