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Wade-Vallance AK, Yang Z, Libang JB, Krishnapura AR, Jung JB, Matcham EW, Robinson MJ, Allen CDC. BCR ligation selectively inhibits IgE class switch recombination. BIORXIV : THE PREPRINT SERVER FOR BIOLOGY 2024:2024.09.18.613749. [PMID: 39345367 PMCID: PMC11429801 DOI: 10.1101/2024.09.18.613749] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 10/01/2024]
Abstract
Mechanisms that restrict class switch recombination (CSR) to IgE limit the subsequent production of IgE antibodies and therefore the development of allergic disease. Mice with impaired B cell receptor (BCR) signaling have significantly increased IgE responses, consistent with a role for BCR signaling in IgE regulation. While prior work focused on BCR signaling in IgE-expressing cells to explain these findings, it has been reported that BCR signaling can reduce CSR. Therefore, we investigated the possibility that IgE CSR might be particularly sensitive to inhibition by BCR signaling in unswitched B cells. We found that immunization of mice with high-affinity antigen resulted in reduced representation of IgE-expressing cells among germinal center B cells and plasma cells relative to a low-affinity antigen. Mechanistic experiments with cultured mouse B cells demonstrated that BCR ligands selectively inhibited IgE CSR in a dose-, affinity-, and avidity-dependent manner. Signaling via Syk was required for the inhibition of IgE CSR following BCR stimulation, whereas inhibition of the PI3K subunit p110δ increased IgE CSR independently of BCR ligation. The inhibition of IgE CSR by BCR ligands synergized with IL-21 or TGFβ1. BCR ligation also inhibited CSR to IgE in human tonsillar B cells, and this inhibition was also synergistic with IL-21. These findings establish that IgE CSR is uniquely susceptible to inhibition by BCR signaling in mouse and human B cells, with important implications for the regulation and pathogenesis of allergic disease.
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2
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Wabnitz H, Cruz-Leal Y, Lazarus AH. Antigen-specific IgG subclass composition in recipient mice can indicate the degree of red blood cell alloimmunization as well as discern between primary and secondary immunization. Transfusion 2023; 63:619-628. [PMID: 36591986 DOI: 10.1111/trf.17232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 12/05/2022] [Accepted: 12/05/2022] [Indexed: 01/03/2023]
Abstract
BACKGROUND Despite the vast antigen disparity between donor and recipient red blood cells (RBCs), only 2%-6% of transfusion patients mount an alloantibody response. Recently, RBC antigen density has been proposed as one of the factors that can influence alloimmunization, however, there has been no characterization of the role of antigen density along with RBC dose in primary and secondary immunization. STUDY DESIGN AND METHODS To generate RBCs that express distinct antigen copy numbers, different quantities of hen egg lysozyme (HEL) were coupled to murine RBCs. The HEL-RBCs were subsequently transfused into recipient mice at different RBC doses and their HEL-specific IgM, IgG, and IgG subclass response was evaluated. RESULTS Productive immune responses could be generated through a high copy number antigen transfused at low RBC doses or a low copy number transfused at high RBC doses. Further, primary but submaximal humoral immunization predominantly induced the IgG2b and IgG3 subclasses. In contrast, a maximal primary immunization or a secondary immunization induced all four IgG subclasses. DISCUSSION Our results confirm the existence of an antigen threshold for productive immune responses but indicate that a high antigen copy number alone might not be enough to induce a response, but rather a combination of both antigen copy number and cell dosage may determine the outcome of immunization. Further, this study provides a proof of concept that the IgG subclass composition can be an indicator of the level of RBC alloimmunization as well as discern between primary and secondary immunization at least in this murine model.
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Affiliation(s)
- Hanna Wabnitz
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
| | - Yoelys Cruz-Leal
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Innovation and Portfolio Management, Canadian Blood Services, Ottawa, Ontario, Canada
| | - Alan H Lazarus
- Keenan Research Centre for Biomedical Science, St. Michael's Hospital, Unity Health Toronto, Toronto, Ontario, Canada
- Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, Ontario, Canada
- Innovation and Portfolio Management, Canadian Blood Services, Ottawa, Ontario, Canada
- Department of Medicine, University of Toronto, Toronto, Ontario, Canada
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3
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Pone EJ, Hernandez-Davies JE, Jan S, Silzel E, Felgner PL, Davies DH. Multimericity Amplifies the Synergy of BCR and TLR4 for B Cell Activation and Antibody Class Switching. Front Immunol 2022; 13:882502. [PMID: 35663959 PMCID: PMC9161726 DOI: 10.3389/fimmu.2022.882502] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2022] [Accepted: 04/20/2022] [Indexed: 12/15/2022] Open
Abstract
Sustained signaling through the B cell antigen receptor (BCR) is thought to occur only when antigen(s) crosslink or disperse multiple BCR units, such as by multimeric antigens found on the surfaces of viruses or bacteria. B cell-intrinsic Toll-like receptor (TLR) signaling synergizes with the BCR to induce and shape antibody production, hallmarked by immunoglobulin (Ig) class switch recombination (CSR) of constant heavy chains from IgM/IgD to IgG, IgA or IgE isotypes, and somatic hypermutation (SHM) of variable heavy and light chains. Full B cell differentiation is essential for protective immunity, where class switched high affinity antibodies neutralize present pathogens, memory B cells are held in reserve for future encounters, and activated B cells also serve as semi-professional APCs for T cells. But the rules that fine-tune B cell differentiation remain partially understood, despite their being essential for naturally acquired immunity and for guiding vaccine development. To address this in part, we have developed a cell culture system using splenic B cells from naive mice stimulated with several biotinylated ligands and antibodies crosslinked by streptavidin reagents. In particular, biotinylated lipopolysaccharide (LPS), a Toll-like receptor 4 (TLR4) agonist, and biotinylated anti-IgM were pre-assembled (multimerized) using streptavidin, or immobilized on nanoparticles coated with streptavidin, and used to active B cells in this precisely controlled, high throughput assay. Using B cell proliferation and Ig class switching as metrics for successful B cell activation, we show that the stimuli are both synergistic and dose-dependent. Crucially, the multimerized immunoconjugates are most active over a narrow concentration range. These data suggest that multimericity is an essential requirement for B cell BCR/TLRs ligands, and clarify basic rules for B cell activation. Such studies highlight the importance in determining the choice of single vs multimeric formats of antigen and PAMP agonists during vaccine design and development.
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Kuo HC, Pan CT, Huang YH, Huang FC, Lin YS, Li SC, Huang LH. Global Investigation of Immune Repertoire Suggests Kawasaki Disease Has Infectious Cause. Circ J 2019; 83:2070-2078. [PMID: 31378745 DOI: 10.1253/circj.cj-19-0206] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
BACKGROUND Kawasaki disease (KD) severely threatens young children's health worldwide. The pathogenic mechanism of KD has not yet been solved, so there is still debate over whether KD is an infectious disease or an autoimmune disease.Methods and Results:To solve this problem, an immune repertoire analysis of KD was conducted. We collected blood cell RNA samples and prepared them into amplicons with iRepertoire kits. The amplicons were sequenced and analyzed with the iRepertoire pipeline. We first identified KD-specific VJ and VDJ forms that had the potential to serve as biomarkers of KD. In addition, the KD-specific VDJ forms were contributed mostly by immunoglobulin G. The D50 value analysis showed that B-cell diversity in KD is decreased, suggesting unique immunoglobulins are produced in KD. Moreover, V, D and J segment usage in IgA, IgG and IgM was consistent with previous KD studies. Further comparison showed no difference in CDR3 peptide length between KD and fever controls (subjects with fever but not diagnosed as KD), indicting KD had B-cell selection phenomenon that has a non-autoimmune pattern. The comparison of amino acid usage of the CDR3 region demonstrated a preference for hydrophilic amino acids in KD. CONCLUSIONS The results of D50 value, VDJ usage and CDR3 peptide length analyses suggested the characteristics of infectious disease for KD.
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Affiliation(s)
- Ho-Chang Kuo
- Kawasaki Disease Center, Kaohsiung Chang Gung Memorial Hospital.,Department of Pediatrics, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine
| | - Cheng-Tsung Pan
- Institute of Bioinformatics and Systems Biology, National Chiao Tung University
| | - Ying-Hsien Huang
- Kawasaki Disease Center, Kaohsiung Chang Gung Memorial Hospital.,Department of Pediatrics, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine
| | - Fu-Chen Huang
- Kawasaki Disease Center, Kaohsiung Chang Gung Memorial Hospital.,Department of Pediatrics, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine
| | - Yeong-Shin Lin
- Institute of Bioinformatics and Systems Biology, National Chiao Tung University.,Department of Biological Science and Technology, National Chiao Tung University
| | - Sung-Chou Li
- Genomics and Proteomics Core Laboratory, Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine
| | - Lien-Hung Huang
- Genomics and Proteomics Core Laboratory, Department of Medical Research, Kaohsiung Chang Gung Memorial Hospital and Chang Gung University College of Medicine
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5
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Çebi M, Durmuş H, Yılmaz V, Yentür SP, Aysal F, Oflazer P, Parman Y, Deymeer F, Saruhan-Direskeneli G. Relation of HLA-DRB1 to IgG4 autoantibody and cytokine production in muscle-specific tyrosine kinase myasthenia gravis (MuSK-MG). Clin Exp Immunol 2019; 197:214-221. [PMID: 30929252 DOI: 10.1111/cei.13302] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/27/2019] [Indexed: 12/12/2022] Open
Abstract
A small subset of myasthenia gravis (MG) patients develop autoantibodies against muscle-specific kinase (MuSK), which are predominantly of the immunoglobulin (Ig)G4 isotype. MuSK-MG is strongly associated with HLA-DRB1*14, HLA-DRB1*16 and HLA-DQB1*05. In this study, the possible effects of these HLA associations on MuSK IgG autoantibody or cytokine production were investigated. Samples from 80 MG patients with MuSK antibodies were studied. The disease-associated HLA types were screened in the DNA samples. The IgG1, IgG2, IgG3 and IgG4 titres of the MuSK antibodies and the levels of interleukin (IL)-4, IL-6, IL-17A and IL-10 were measured in the sera. Comparisons were made among the groups with or without HLA-DRB1*14, HLA-DRB1*16 or HLA-DQB1*05. The IgG4 titres of the MuSK antibodies were higher than those of the IgG1, IgG2 and IgG3 isotypes among the whole group of patients. DRB1*14 (+) DRB1*16 (-) patients had higher levels of IgG4 antibodies than those of DRB1*14 (-) DRB1*16 (+) patients. DRB1*14 (+) DRB1*16 (+) patients also had higher levels of IgG4 antibodies than those of DRB1*14 (-) DRB1*16 (+) and DRB1*14 (-) DRB1*16 (-) patients. Higher IL-10 and lower IL-17A levels were measured in DRB1*14 (+) DRB1*16 (-) patients than in DRB1*14 (-) DRB1*16 (-) patients. The higher IgG4 titres of MuSK autoantibodies in patients carrying HLA-DRB1*14 than those in the other patients suggest a role for HLA in the production of the antibodies. The differences in IL-10 and IL-17A support the role of DRB1 in the etiopathogenesis of this autoimmune response.
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Affiliation(s)
- M Çebi
- Department of Physiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - H Durmuş
- Department of Neurology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - V Yılmaz
- Department of Physiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - S P Yentür
- Department of Physiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - F Aysal
- Department of Neurology, Bakirkoy Research and Training Hospital for Psychiatric and Neurological Diseases, Istanbul, Turkey.,Department of Neurology, Istanbul Medipol University School of Medicine, Istanbul, Turkey
| | - P Oflazer
- Department of Neurology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - Y Parman
- Department of Neurology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - F Deymeer
- Department of Neurology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
| | - G Saruhan-Direskeneli
- Department of Physiology, Istanbul Medical Faculty, Istanbul University, Istanbul, Turkey
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6
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Poyntz HC, Jones A, Jauregui R, Young W, Gestin A, Mooney A, Lamiable O, Altermann E, Schmidt A, Gasser O, Weyrich L, Jolly CJ, Linterman MA, Gros GL, Hawkins ED, Forbes-Blom E. Genetic regulation of antibody responsiveness to immunization in substrains of BALB/c mice. Immunol Cell Biol 2018; 97:39-53. [PMID: 30152893 PMCID: PMC6378622 DOI: 10.1111/imcb.12199] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2018] [Revised: 08/20/2018] [Accepted: 08/23/2018] [Indexed: 12/17/2022]
Abstract
Antibody‐mediated immunity is highly protective against disease. The majority of current vaccines confer protection through humoral immunity, but there is high variability in responsiveness across populations. Identifying immune mechanisms that mediate low antibody responsiveness may provide potential strategies to boost vaccine efficacy. Here, we report diverse antibody responsiveness to unadjuvanted as well as adjuvanted immunization in substrains of BALB/c mice, resulting in high and low antibody response phenotypes. Furthermore, these antibody phenotypes were not affected by changes in environmental factors such as the gut microbiota composition. Antigen‐specific B cells following immunization had a marked difference in capability to class switch, resulting in perturbed IgG isotype antibody production. In vitro, a B‐cell intrinsic defect in the regulation of class‐switch recombination was identified in mice with low IgG antibody production. Whole genome sequencing identified polymorphisms associated with the magnitude of antibody produced, and we propose candidate genes that may regulate isotype class‐switching capability. This study highlights that mice sourced from different vendors can have significantly altered humoral immune response profiles, and provides a resource to interrogate genetic regulators of antibody responsiveness. Together these results further our understanding of immune heterogeneity and suggest additional research on the genetic influences of adjuvanted vaccine strategies is warranted for enhancing vaccine efficacy.
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Affiliation(s)
- Hazel C Poyntz
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand.,High-Value Nutrition National Science Challenge, New Zealand
| | - Angela Jones
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Ruy Jauregui
- Grasslands Research Centre, AgResearch, Tennent Drive, Palmerston North, New Zealand
| | - Wayne Young
- Grasslands Research Centre, AgResearch, Tennent Drive, Palmerston North, New Zealand.,Riddet Institute, Massey University, Palmerston North, 4474, New Zealand
| | - Aurélie Gestin
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Anna Mooney
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Olivier Lamiable
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Eric Altermann
- Grasslands Research Centre, AgResearch, Tennent Drive, Palmerston North, New Zealand.,Riddet Institute, Massey University, Palmerston North, 4474, New Zealand
| | - Alfonso Schmidt
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Olivier Gasser
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Laura Weyrich
- Australian Centre for Ancient DNA, University of Adelaide, North Terrace, Adelaide, SA, 5005, Australia
| | - Christopher J Jolly
- Centenary Institute and Sydney Medical School, University of Sydney, Missenden Road, Sydney, NSW, 2050, Australia
| | - Michelle A Linterman
- Lymphocyte Signaling and Development, Babraham Institute, Cambridge, CB22 3AT, UK
| | - Graham Le Gros
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand
| | - Edwin D Hawkins
- Walter and Eliza Hall Institute of Medical Research, Parkville, VIC, 3052, Australia.,Department of Medical Biology, University of Melbourne, Parkville, VIC, 3010, Australia
| | - Elizabeth Forbes-Blom
- Malaghan Institute of Medical Research, Victoria University of Wellington, Gate 7, Kelburn Parade, Wellington, 6012, New Zealand.,High-Value Nutrition National Science Challenge, New Zealand
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7
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Liu J, Li Y, Lu Z, Gu J, Liang Y, Huang E, Wang Z, Zhang H, Wang L, Zhang D, Yu H, Liu R, Chu Y. Deceleration of glycometabolism impedes IgG-producing B-cell-mediated tumor elimination by targeting SATB1. Immunology 2018; 156:56-68. [PMID: 30171602 DOI: 10.1111/imm.12998] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2018] [Revised: 08/18/2018] [Accepted: 08/20/2018] [Indexed: 12/11/2022] Open
Abstract
B lymphocytes, known as antibody producers, mediate tumor cell destruction in the manner of antibody-dependent cell-mediated cytotoxicity; however, their anti-tumor function seems to be weakened during tumorigenesis, while the underlying mechanisms remain unclear. In this study, we found that IgG mediated anti-tumor effects, but IgG-producing B cells decreased in various tumors. Considering the underlying mechanism, glycometabolism was noteworthy. We found that tumor-infiltrating B cells were glucose-starved and accompanied by a deceleration of glycometabolism. Both inhibition of glycometabolism and deprivation of glucose through tumor cells, or glucose-free treatment, reduced the differentiation of B cells into IgG-producing cells. In this process, special AT-rich sequence-binding protein-1 (SATB1) was significantly silenced in B cells. Down-regulating SATB1 by inhibiting glycometabolism or RNA interference reduced the binding of signal transducer and activator of transcription 6 (STAT6) to the promoter of germline Cγ gene, subsequently resulting in fewer B cells producing IgG. Our findings provide the first evidence that glycometabolic inhibition by tumorigenesis suppresses differentiation of B cells into IgG-producing cells, and altering glycometabolism may be promising in improving the anti-tumor effect of B cells.
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Affiliation(s)
- Jiajing Liu
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Yifan Li
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Zhou Lu
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Jie Gu
- Department of Thoracic Surgery, The Affiliated Zhongshan Hospital of Fudan University, Shanghai, China
| | - Yun Liang
- Department of Orthopedics, The Affiliated Zhongshan Hospital of Fudan University, Shanghai, China
| | - Enyu Huang
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Zhiming Wang
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Hushan Zhang
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Luman Wang
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Dan Zhang
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Hongxiu Yu
- Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Ronghua Liu
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
| | - Yiwei Chu
- Department of Immunology, School of Basic Medical Sciences, Institute of Biomedical Sciences, Fudan University, Shanghai, China
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8
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Collins AM. IgG subclass co-expression brings harmony to the quartet model of murine IgG function. Immunol Cell Biol 2016; 94:949-954. [PMID: 27502143 DOI: 10.1038/icb.2016.65] [Citation(s) in RCA: 110] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2016] [Revised: 07/12/2016] [Accepted: 07/14/2016] [Indexed: 12/24/2022]
Abstract
A model of murine IgG function is presented in which the co-expression of the IgG subclasses is a central feature, class switching occurs before the commencement of somatic hypermutation, and there is little switching between subclasses. It is named the quartet model to emphasize the harmony that comes from the simultaneous presence of the four subclasses. In this model, IgG3 and IgG2b antibodies are particularly important early in the response, when T-cell help may be limiting. IgG3 initiates inflammation through complement fixation, whereas IgG2b provides early FcγR-mediated effector functions. As T-cell help strengthens, IgG2a antibodies increase the power of the response, whereas IgG1 production helps limit the inflammatory drive and limits immunopathology. The model highlights the fact that murine IgG subclasses function quite differently to human IgG subclasses. This allows them to serve the special immunological needs of a species that is vulnerable because of its small size.
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Affiliation(s)
- Andrew M Collins
- School of Biotechnology and Biomolecular Sciences, The University of New South Wales, Sydney, NSW, Australia
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9
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Hara Y, Tashiro Y, Murakami A, Nishimura M, Shimizu T, Kubo M, Burrows PD, Azuma T. High affinity IgM(+) memory B cells are generated through a germinal center-dependent pathway. Mol Immunol 2015; 68:617-27. [PMID: 26514429 DOI: 10.1016/j.molimm.2015.10.003] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2015] [Revised: 09/30/2015] [Accepted: 10/08/2015] [Indexed: 12/19/2022]
Abstract
During a T cell-dependent immune response, B cells undergo clonal expansion and selection and the induction of isotype switching and somatic hypermutation (SHM). Although somatically mutated IgM(+) memory B cells have been reported, it has not been established whether they are really high affinity B cells. We tracked (4-hydroxy-3-nitrophenyl) acetyl hapten-specific GC B cells from normal immunized mice based on affinity of their B cell receptor (BCR) and performed BCR sequence analysis. SHM was evident by day 7 postimmunization and increased with time, such that high affinity IgM(+) as well as IgG(+) memory B cells continued to be generated up to day 42. In contrast, class-switch recombination (CSR) was almost completed by day 7 and then the ratio of IgG1(+)/IgM(+) GC B cells remained unchanged. Together these findings suggest that IgM(+) B cells undergo SHM in the GC to generate high affinity IgM(+) memory cells and that this process continues even after CSR is accomplished.
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Affiliation(s)
- Yasushi Hara
- Laboratory for Structural Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Yasuyuki Tashiro
- Laboratory for Structural Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan; Division of Development and Aging, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Akikazu Murakami
- Laboratory for Structural Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Miyuki Nishimura
- Laboratory for Structural Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan
| | - Takeyuki Shimizu
- Department of Immunology, Kochi Medical School, Kochi University, Oko-cho Kohasu, Nankoku, Kochi 783-8505, Japan
| | - Masato Kubo
- Division of Molecular Pathology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan; Laboratory for Cytokine Regulation, Riken Center for Integrative Medical Sciences, 1-7-22 Suehiro-cho, Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan
| | - Peter D Burrows
- Department of Microbiology, University of Alabama at Birmingham, UAB 406 SHEL, 1530 Third Avenue South, Birmingham, AL 35294, USA; Department of Genetics, University of Alabama at Birmingham, UAB 406 SHEL, 1530 Third Avenue South, Birmingham, AL 35294, USA
| | - Takachika Azuma
- Laboratory for Structural Immunology, Research Institute for Biomedical Sciences, Tokyo University of Science, 2669 Yamazaki, Noda, Chiba 278-0022, Japan; Antibody Technology Research Center, Co., Ltd., 2361-1-S401 Yamazaki, Noda, Chiba 278-0022, Japan.
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10
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Stavnezer J, Schrader CE. IgH chain class switch recombination: mechanism and regulation. THE JOURNAL OF IMMUNOLOGY 2015; 193:5370-8. [PMID: 25411432 DOI: 10.4049/jimmunol.1401849] [Citation(s) in RCA: 168] [Impact Index Per Article: 18.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
IgH class switching occurs rapidly after activation of mature naive B cells, resulting in a switch from expression of IgM and IgD to expression of IgG, IgE, or IgA; this switch improves the ability of Abs to remove the pathogen that induces the humoral immune response. Class switching occurs by a deletional recombination between two switch regions, each of which is associated with a H chain constant region gene. Class switch recombination (CSR) is instigated by activation-induced cytidine deaminase, which converts cytosines in switch regions to uracils. The uracils are subsequently removed by two DNA-repair pathways, resulting in mutations, single-strand DNA breaks, and the double-strand breaks required for CSR. We discuss several aspects of CSR, including how CSR is induced, CSR in B cell progenitors, the roles of transcription and chromosomal looping in CSR, and the roles of certain DNA-repair enzymes in CSR.
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Affiliation(s)
- Janet Stavnezer
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA 01605
| | - Carol E Schrader
- Department of Microbiology and Physiological Systems, University of Massachusetts Medical School, Worcester, MA 01605
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11
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Pone EJ, Lam T, Lou Z, Wang R, Chen Y, Liu D, Edinger AL, Xu Z, Casali P. B cell Rab7 mediates induction of activation-induced cytidine deaminase expression and class-switching in T-dependent and T-independent antibody responses. THE JOURNAL OF IMMUNOLOGY 2015; 194:3065-78. [PMID: 25740947 DOI: 10.4049/jimmunol.1401896] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Class switch DNA recombination (CSR) is central to the maturation of the Ab response because it diversifies Ab effector functions. Like somatic hypermutation, CSR requires activation-induced cytidine deaminase (AID), whose expression is restricted to B cells, as induced by CD40 engagement or dual TLR-BCR engagement (primary CSR-inducing stimuli). By constructing conditional knockout Igh(+/C)γ(1-cre)Rab7(fl/fl) mice, we identified a B cell-intrinsic role for Rab7, a small GTPase involved in intracellular membrane functions, in mediating AID induction and CSR. Igh(+/C)γ(1-cre)Rab7(fl/fl) mice displayed normal B and T cell development and were deficient in Rab7 only in B cells undergoing Igh(C)γ(1-cre) Iγ1-Sγ1-Cγ1-cre transcription, as induced--like Igh germline Iγ1-Sγ1-Cγ1 and Iε-Sε-Cε transcription--by IL-4 in conjunction with a primary CSR-inducing stimulus. These mice could not mount T-independent or T-dependent class-switched IgG1 or IgE responses while maintaining normal IgM levels. Igh(+/C)γ(1-cre)Rab7(fl/fl) B cells showed, in vivo and in vitro, normal proliferation and survival, normal Blimp-1 expression and plasma cell differentiation, as well as intact activation of the noncanonical NF-κB, p38 kinase, and ERK1/2 kinase pathways. They, however, were defective in AID expression and CSR in vivo and in vitro, as induced by CD40 engagement or dual TLR1/2-, TLR4-, TLR7-, or TLR9-BCR engagement. In Igh(+/C)γ(1-cre)Rab7(fl/fl) B cells, CSR was rescued by enforced AID expression. These findings, together with our demonstration that Rab7-mediated canonical NF-κB activation, as critical to AID induction, outline a novel role of Rab7 in signaling pathways that lead to AID expression and CSR, likely by promoting assembly of signaling complexes along intracellular membranes.
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Affiliation(s)
- Egest J Pone
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229
| | - Tonika Lam
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229; Department of Molecular Biology and Biochemistry, University of California, Irvine, Irvine, CA 92697
| | - Zheng Lou
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229
| | - Rui Wang
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229; Xiangya Medical School, Central South University of China, 410000 Changsha, Hunan Province, China
| | - Yuhui Chen
- Center for Human Immunobiology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030; and
| | - Dongfang Liu
- Center for Human Immunobiology, Texas Children's Hospital, Baylor College of Medicine, Houston, TX 77030; and
| | - Aimee L Edinger
- Department of Developmental and Cell Biology, University of California, Irvine, Irvine, CA 92697
| | - Zhenming Xu
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229;
| | - Paolo Casali
- Department of Microbiology and Immunology, School of Medicine, University of Texas Health Science Center, San Antonio, TX 78229;
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OVA-bound nanoparticles induce OVA-specific IgG1, IgG2a, and IgG2b responses with low IgE synthesis. Vaccine 2014; 32:5918-24. [DOI: 10.1016/j.vaccine.2014.08.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2014] [Revised: 08/18/2014] [Accepted: 08/30/2014] [Indexed: 11/22/2022]
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13
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Hawkins ED, Turner ML, Wellard CJ, Zhou JHS, Dowling MR, Hodgkin PD. Quantal and graded stimulation of B lymphocytes as alternative strategies for regulating adaptive immune responses. Nat Commun 2014; 4:2406. [PMID: 24009041 PMCID: PMC3778729 DOI: 10.1038/ncomms3406] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2012] [Accepted: 08/06/2013] [Indexed: 12/15/2022] Open
Abstract
Lymphocytes undergo a typical response pattern following stimulation in vivo: they proliferate, differentiate to effector cells, cease dividing and predominantly die, leaving a small proportion of long-lived memory and effector cells. This pattern results from cell-intrinsic processes following activation and the influence of external regulation. Here we apply quantitative methods to study B-cell responses in vitro. Our results reveal that B cells stimulated through two Toll-like receptors (TLRs) require minimal external direction to undergo the basic pattern typical of immunity. Altering the stimulus strength regulates the outcome in a quantal manner by varying the number of cells that participate in the response. In contrast, the T-cell-dependent CD40 activation signal induces a response where division times and differentiation rates vary in relation to stimulus strength. These studies offer insight into how the adaptive antibody response may have evolved from simple autonomous response patterns to the highly regulable state that is now observed in mammals.
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Affiliation(s)
- E D Hawkins
- 1] Immunology Division, The Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia [2] Department of Medical Biology, The University of Melbourne, Parkville, Victoria 3010, Australia [3]
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14
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Hou J, Liu Y, Hsi J, Wang H, Tao R, Shao Y. Cholera toxin B subunit acts as a potent systemic adjuvant for HIV-1 DNA vaccination intramuscularly in mice. Hum Vaccin Immunother 2014; 10:1274-83. [PMID: 24633335 PMCID: PMC4896579 DOI: 10.4161/hv.28371] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2013] [Revised: 02/17/2014] [Accepted: 02/27/2014] [Indexed: 11/19/2022] Open
Abstract
Cholera toxin B subunit (CTB) was investigated as a classical mucosal adjuvant that can increase vaccine immunogenicity. In this study, we found out the in vitro efficacy of cholera toxin B subunit (CTB) in activating mice bone marrow-derived dendritic cells (BMDCs) through Toll-like receptor signaling pathways. In vitro RNA and transcriptional level profiling arrays revealed that CTB guides high levels of Th1 and Th2 type cytokines, inflammatory cytokines, and chemokines. Based on the robustness of these profiling results, we examined the induction of HIV Env-specific immunity by CTB co-inoculated with HIV Env DNA vaccine intramuscularly in vivo. CTB enhanced HIV-Env specific cellular immune responses in Env-specific IFN-γ ELISPOT, compared with DNA vaccine alone. Moreover, CTB induced high levels of Env specific humoral response and promoted antibody maturation after the third round of vaccination. This combination immunization strategy induced a Th2-type bias response which is indicative of a high ratio of IgG1/IgG2a. This study reports that CTB as a classical mucosal adjuvant could enhance HIV-1 DNA-based vaccine immunogenicity intramuscularly; therefore, these findings suggest that CTB could serve as an effective candidate adjuvant for DNA vaccination.
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Affiliation(s)
- Jue Hou
- State Key Laboratory for Infectious Disease Prevention and Control; National Center for AIDS/STD Control and Prevention; Chinese Center for Disease Control and Prevention; Beijing, PR China
- Center of Medical Physics and Technology; Hefei Institutes of Physical Science; Chinese Academy of Sciences; Hefei, PR China
| | - Ying Liu
- State Key Laboratory for Infectious Disease Prevention and Control; National Center for AIDS/STD Control and Prevention; Chinese Center for Disease Control and Prevention; Beijing, PR China
| | - Jenny Hsi
- State Key Laboratory for Infectious Disease Prevention and Control; National Center for AIDS/STD Control and Prevention; Chinese Center for Disease Control and Prevention; Beijing, PR China
| | - Hongzhi Wang
- Center of Medical Physics and Technology; Hefei Institutes of Physical Science; Chinese Academy of Sciences; Hefei, PR China
| | - Ran Tao
- The Fourth Affiliated Hospital of Anhui Medical University; Hefei, PR China
| | - Yiming Shao
- State Key Laboratory for Infectious Disease Prevention and Control; National Center for AIDS/STD Control and Prevention; Chinese Center for Disease Control and Prevention; Beijing, PR China
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15
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Wiskott-Aldrich Syndrome protein deficiency perturbs the homeostasis of B-cell compartment in humans. J Autoimmun 2013; 50:42-50. [PMID: 24369837 PMCID: PMC4012141 DOI: 10.1016/j.jaut.2013.10.006] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2013] [Revised: 10/16/2013] [Accepted: 10/31/2013] [Indexed: 12/17/2022]
Abstract
Wiskott–Aldrich Syndrome protein (WASp) regulates the cytoskeleton in hematopoietic cells and mutations in its gene cause the Wiskott–Aldrich Syndrome (WAS), a primary immunodeficiency with microthrombocytopenia, eczema and a higher susceptibility to develop tumors. Autoimmune manifestations, frequently observed in WAS patients, are associated with an increased risk of mortality and still represent an unsolved aspect of the disease. B cells play a crucial role both in immune competence and self-tolerance and defects in their development and function result in immunodeficiency and/or autoimmunity. We performed a phenotypical and molecular analysis of central and peripheral B-cell compartments in WAS pediatric patients. We found a decreased proportion of immature B cells in the bone marrow correlating with an increased presence of transitional B cells in the periphery. These results could be explained by the defective migratory response of WAS B cells to SDF-1α, essential for the retention of immature B cells in the BM. In the periphery, we observed an unusual expansion of CD21low B-cell population and increased plasma BAFF levels that may contribute to the high susceptibility to develop autoimmune manifestations in WAS patients. WAS memory B cells were characterized by a reduced in vivo proliferation, decreased somatic hypermutation and preferential usage of IGHV4-34, an immunoglobulin gene commonly found in autoreactive B cells. In conclusion, our findings demonstrate that WASp-deficiency perturbs B-cell homeostasis thus adding a new layer of immune dysregulation concurring to the increased susceptibility to develop autoimmunity in WAS patients. WASp-deficiency affects both central and peripheral B-cell development. An early egress of immature B cells leads to an increase of transitional B cells in periphery. Reduced maturation status of WAS memory B cells. Altered selection of both protective and autoreactive Ig gene families in WAS patients. Potentially autoreactive CD21low B cells are expanded in WAS patients.
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