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Spencer J, Tull TJ, Bemark M. Weller et al, T-independent responses to polysaccharides in humans mobilize marginal zone B cells pre-diversified against gut bacterial antigens . Immunol Lett 2023; 256-257:66-67. [PMID: 37040847 DOI: 10.1016/j.imlet.2023.04.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 04/07/2023] [Indexed: 04/13/2023]
Affiliation(s)
- Jo Spencer
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK.
| | - Thomas J Tull
- St John's Institute of Dermatology, King's College London, Guy's Hospital Campus, London, SE1 9RT, UK
| | - Mats Bemark
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE 405 30 Gothenburg, Sweden; Department of Clinical Immunology and Transfusion Medicine, Region Västra Götaland, Sahlgrenska University Hospital, Gothenburg, Sweden
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2
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Koers J, Pollastro S, Tol S, Niewold ITG, van Schouwenburg PA, de Vries N, Rispens T. Improving naive B cell isolation by absence of CD45RB glycosylation and CD27 expression in combination with BCR isotype. Eur J Immunol 2022; 52:1630-1639. [PMID: 35862268 DOI: 10.1002/eji.202250013] [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: 05/26/2022] [Revised: 07/06/2022] [Accepted: 07/20/2022] [Indexed: 12/14/2022]
Abstract
In past years ex vivo and in vivo experimental approaches involving human naive B cells have proven fundamental for elucidation of mechanisms promoting B cell differentiation in both health and disease. For such studies, it is paramount that isolation strategies yield a population of bona fide naive B cells, i.e., B cells that are phenotypically and functionally naive, clonally non-expanded, and have non-mutated BCR variable regions. In this study different combinations of common as well as recently identified B cell markers were compared to isolate naive B cells from human peripheral blood. High-throughput BCR sequencing was performed to analyze levels of somatic hypermutation and clonal expansion. Additionally, contamination from mature mutated B cells intrinsic to each cell-sorting strategy was evaluated and how this impacts the purity of obtained populations. Our results show that current naive B cell isolation strategies harbor contamination from non-naive B cells, and use of CD27-IgD+ is adequate but can be improved by including markers for CD45RB glycosylation and IgM. The finetuning of naive B cell classification provided herein will harmonize research lines using naive B cells, and will improve B cell profiling during health and disease, e.g. during diagnosis, treatment, and vaccination strategies.
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Affiliation(s)
- Jana Koers
- Sanquin Research, Department of Immunopathology, and Landsteiner Laboratory, Amsterdam University medical centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Sabrina Pollastro
- Sanquin Research, Department of Immunopathology, and Landsteiner Laboratory, Amsterdam University medical centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Simon Tol
- Sanquin Research, Department of Research facilities, and Landsteiner Laboratory, Amsterdam University medical centers, University of Amsterdam, Amsterdam, The Netherlands
| | - Ilse T G Niewold
- Department of Rheumatology and Clinical Immunology, ARC, Amsterdam UMC, location AMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Pauline A van Schouwenburg
- Department of Pediatrics, Laboratory for Pediatric Immunology, Leiden University Medical Center, Leiden, Netherlands
| | - Niek de Vries
- Department of Rheumatology and Clinical Immunology, ARC, Amsterdam UMC, location AMC, University of Amsterdam, Amsterdam, The Netherlands
| | - Theo Rispens
- Sanquin Research, Department of Immunopathology, and Landsteiner Laboratory, Amsterdam University medical centers, University of Amsterdam, Amsterdam, The Netherlands
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3
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Koers J, Pollastro S, Tol S, Pico-Knijnenburg I, Derksen NIL, van Schouwenburg PA, van der Burg M, van Ham SM, Rispens T. CD45RB Glycosylation and Ig Isotype Define Maturation of Functionally Distinct B Cell Subsets in Human Peripheral Blood. Front Immunol 2022; 13:891316. [PMID: 35572548 PMCID: PMC9095956 DOI: 10.3389/fimmu.2022.891316] [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: 03/07/2022] [Accepted: 04/04/2022] [Indexed: 11/13/2022] Open
Abstract
Glycosylation of CD45RB (RB+) has recently been identified to mark antigen-experienced B cells, independent of their CD27 expression. By using a novel combination of markers including CD45RB glycosylation, CD27 and IgM/IgD isotype expression we segregated human peripheral blood B cell subsets and investigated their IGHV repertoire and in vitro functionality. We observed distinct maturation stages for CD27-RB+ cells, defined by differential expression of non-switched Ig isotypes. CD27-RB+ cells, which only express IgM, were more matured in terms of Ig gene mutation levels and function as compared to CD27-RB+ cells that express both IgM and IgD or cells that were CD27-RB-. Moreover, CD27-RB+IgM+ cells already showed remarkable rigidity in IgM isotype commitment, different from CD27-RB+IgMD+ and CD27-RB- cells that still demonstrated great plasticity in B cell fate decision. Thus, glycosylation of CD45RB is indicative for antigen-primed B cells, which are, dependent on the Ig isotype, functionally distinct.
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Affiliation(s)
- Jana Koers
- Landsteiner Laboratory, Sanquin Research, Department of Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Sabrina Pollastro
- Landsteiner Laboratory, Sanquin Research, Department of Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Simon Tol
- Landsteiner Laboratory, Sanquin Research, Department of Research Facilities, Amsterdam University Medical Center (UMC), University of Amsterdam, Amsterdam, Netherlands
| | - Ingrid Pico-Knijnenburg
- Laboratory for Pediatric Immunology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Ninotska I L Derksen
- Landsteiner Laboratory, Sanquin Research, Department of Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
| | - Pauline A van Schouwenburg
- Laboratory for Pediatric Immunology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - Mirjam van der Burg
- Laboratory for Pediatric Immunology, Department of Pediatrics, Leiden University Medical Center, Leiden, Netherlands
| | - S Marieke van Ham
- Landsteiner Laboratory, Sanquin Research, Department of Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands.,Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, Netherlands
| | - Theo Rispens
- Landsteiner Laboratory, Sanquin Research, Department of Immunopathology, Amsterdam UMC, University of Amsterdam, Amsterdam, Netherlands
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4
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Tull TJ, Pitcher MJ, Guesdon W, Siu JH, Lebrero-Fernández C, Zhao Y, Petrov N, Heck S, Ellis R, Dhami P, Kadolsky UD, Kleeman M, Kamra Y, Fear DJ, John S, Jassem W, Groves RW, Sanderson JD, Robson MG, D’Cruz DP, Bemark M, Spencer J. Human marginal zone B cell development from early T2 progenitors. J Exp Med 2021; 218:e20202001. [PMID: 33538776 PMCID: PMC7868795 DOI: 10.1084/jem.20202001] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2020] [Revised: 11/09/2020] [Accepted: 12/21/2020] [Indexed: 12/11/2022] Open
Abstract
B cells emerge from the bone marrow as transitional (TS) B cells that differentiate through T1, T2, and T3 stages to become naive B cells. We have identified a bifurcation of human B cell maturation from the T1 stage forming IgMhi and IgMlo developmental trajectories. IgMhi T2 cells have higher expression of α4β7 integrin and lower expression of IL-4 receptor (IL4R) compared with the IgMlo branch and are selectively recruited into gut-associated lymphoid tissue. IgMhi T2 cells also share transcriptomic features with marginal zone B cells (MZBs). Lineage progression from T1 cells to MZBs via an IgMhi trajectory is identified by pseudotime analysis of scRNA-sequencing data. Reduced frequency of IgMhi gut-homing T2 cells is observed in severe SLE and is associated with reduction of MZBs and their putative IgMhi precursors. The collapse of the gut-associated MZB maturational axis in severe SLE affirms its existence in health.
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Affiliation(s)
- Thomas J. Tull
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Michael J. Pitcher
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - William Guesdon
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Jacqueline H.Y. Siu
- Department of Surgery, Addenbrooke's Hospital, University of Cambridge, Cambridge, UK
| | - Cristina Lebrero-Fernández
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
| | - Yuan Zhao
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Nedyalko Petrov
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | - Susanne Heck
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | - Richard Ellis
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | - Pawan Dhami
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | | | - Michelle Kleeman
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | - Yogesh Kamra
- Biomedical Research Centre, Guy’s and St. Thomas’ NHS Trust, London, UK
| | - David J. Fear
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Susan John
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Wayel Jassem
- Liver Transplant Unit, Institute of Liver Studies, King's College Hospital, Denmark Hill, London, UK
| | - Richard W. Groves
- St John’s Institute of Dermatology, King’s College London, Guy’s Campus, London, UK
| | - Jeremy D. Sanderson
- Department of Gastroenterology, Guy’s and St Thomas’ NHS Trust, Guy’s Hospital, London, UK
| | - Michael G. Robson
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - David P. D’Cruz
- School of Immunology and Microbial Sciences, King’s College London, London, UK
| | - Mats Bemark
- Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden
- Department of Clinical Immunology and Transfusion Medicine, Region Västra Götaland, Sahlgrenska University Hospital, Gothenburg, Sweden
| | - Jo Spencer
- School of Immunology and Microbial Sciences, King’s College London, London, UK
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5
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Weisel NM, Weisel FJ, Farber DL, Borghesi LA, Shen Y, Ma W, Luning Prak ET, Shlomchik MJ. Comprehensive analyses of B-cell compartments across the human body reveal novel subsets and a gut-resident memory phenotype. Blood 2020; 136:2774-2785. [PMID: 32750113 PMCID: PMC7731793 DOI: 10.1182/blood.2019002782] [Citation(s) in RCA: 60] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Accepted: 06/22/2020] [Indexed: 11/20/2022] Open
Abstract
Although human B cells have been extensively studied, most reports have used peripheral blood as a source. Here, we used a unique tissue resource derived from healthy organ donors to deeply characterize human B-cell compartments across multiple tissues and donors. These datasets revealed that B cells in the blood are not in homeostasis with compartments in other tissues. We found striking donor-to-donor variability in the frequencies and isotype of CD27+ memory B cells (MBCs). A comprehensive antibody-based screen revealed markers of MBC and allowed identification of novel MBC subsets with distinct functions defined according to surface expression of CD69 and CD45RB. We defined a tissue-resident MBC phenotype that was predominant in the gut but absent in blood. RNA-sequencing of MBC subsets from multiple tissues revealed a tissue-resident MBC gene signature as well as gut- and spleen-specific signatures. Overall, these studies provide novel insights into the nature and function of human B-cell compartments across multiple tissues.
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Affiliation(s)
- Nadine M Weisel
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Florian J Weisel
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Donna L Farber
- Columbia Center for Translational Immunology
- Department of Microbiology and Immunology
- Department of Surgery, and
| | - Lisa A Borghesi
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
| | - Yufeng Shen
- Department of Systems Biology, Columbia University Medical Center, New York, NY; and
| | - Wenji Ma
- Department of Systems Biology, Columbia University Medical Center, New York, NY; and
| | - Eline T Luning Prak
- Department of Pathology and Laboratory Medicine, University of Pennsylvania School of Medicine, Philadelphia, PA
| | - Mark J Shlomchik
- Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, PA
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6
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Mellgren K, Nierop AF, Abrahamsson J. Use of Multivariate Immune Reconstitution Patterns to Describe Immune Reconstitution after Allogeneic Stem Cell Transplantation in Children. Biol Blood Marrow Transplant 2019; 25:2045-2053. [DOI: 10.1016/j.bbmt.2019.06.018] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2018] [Revised: 05/08/2019] [Accepted: 06/19/2019] [Indexed: 01/12/2023]
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7
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Alhabbab RY, Nova-Lamperti E, Aravena O, Burton HM, Lechler RI, Dorling A, Lombardi G. Regulatory B cells: Development, phenotypes, functions, and role in transplantation. Immunol Rev 2019; 292:164-179. [DOI: 10.1111/imr.12800] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Accepted: 08/27/2019] [Indexed: 12/15/2022]
Affiliation(s)
- Rowa Y. Alhabbab
- Infectious Disease Unit and Division of Applied Medical Sciences King Fahad Centre for medical research King Abdulaziz University Jeddah Saudi Arabia
- Peter Gorer Department of Immunobiology MRC Centre for Transplantation School of Immunology & Mucosal Biology King's College LondonKing's Health PartnersGuy's Hospital London UK
| | - Estefanía Nova-Lamperti
- Molecular and Translational Immunology Laboratory Department of Clinical Biochemistry and Immunology Pharmacy Faculty Universidad de Concepción Concepción Chile
| | - Octavio Aravena
- Programa Disciplinario de Immunología Instituto de Ciencias Biomédicas Facultad de Medicina Universidad de Chile Santiago Chile
| | - Hannah M. Burton
- Peter Gorer Department of Immunobiology MRC Centre for Transplantation School of Immunology & Mucosal Biology King's College LondonKing's Health PartnersGuy's Hospital London UK
| | - Robert I. Lechler
- Peter Gorer Department of Immunobiology MRC Centre for Transplantation School of Immunology & Mucosal Biology King's College LondonKing's Health PartnersGuy's Hospital London UK
| | - Anthony Dorling
- Peter Gorer Department of Immunobiology MRC Centre for Transplantation School of Immunology & Mucosal Biology King's College LondonKing's Health PartnersGuy's Hospital London UK
| | - Giovanna Lombardi
- Peter Gorer Department of Immunobiology MRC Centre for Transplantation School of Immunology & Mucosal Biology King's College LondonKing's Health PartnersGuy's Hospital London UK
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8
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Systematic comparison of respiratory syncytial virus-induced memory B cell responses in two anatomical compartments. Nat Commun 2019; 10:1126. [PMID: 30850611 PMCID: PMC6408481 DOI: 10.1038/s41467-019-09085-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Accepted: 02/20/2019] [Indexed: 12/25/2022] Open
Abstract
Respiratory syncytial virus (RSV) is a leading cause of hospitalization in infants and young children. Although it is widely agreed that an RSV vaccine should induce both mucosal and systemic antibody responses, little is known about the B cell response to RSV in mucosa-associated lymphoid tissues. Here, we analyze this response by isolating 806 RSV F-specific antibodies from paired adenoid and peripheral blood samples from 4 young children. Overall, the adenoid-derived antibodies show higher binding affinities and neutralization potencies compared to antibodies isolated from peripheral blood. Approximately 25% of the neutralizing antibodies isolated from adenoids originate from a unique population of IgM+ and/or IgD+ memory B cells that contain a high load of somatic mutations but lack expression of classical memory B cell markers. Altogether, the results provide insight into the local B cell response to RSV and have implications for the development of vaccines that stimulate potent mucosal responses.
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9
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Zhao Y, Uduman M, Siu JHY, Tull TJ, Sanderson JD, Wu YCB, Zhou JQ, Petrov N, Ellis R, Todd K, Chavele KM, Guesdon W, Vossenkamper A, Jassem W, D'Cruz DP, Fear DJ, John S, Scheel-Toellner D, Hopkins C, Moreno E, Woodman NL, Ciccarelli F, Heck S, Kleinstein SH, Bemark M, Spencer J. Spatiotemporal segregation of human marginal zone and memory B cell populations in lymphoid tissue. Nat Commun 2018; 9:3857. [PMID: 30242242 PMCID: PMC6155012 DOI: 10.1038/s41467-018-06089-1] [Citation(s) in RCA: 63] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Accepted: 08/17/2018] [Indexed: 01/19/2023] Open
Abstract
Human memory B cells and marginal zone (MZ) B cells share common features such as the expression of CD27 and somatic mutations in their IGHV and BCL6 genes, but the relationship between them is controversial. Here, we show phenotypic progression within lymphoid tissues as MZ B cells emerge from the mature naïve B cell pool via a precursor CD27-CD45RBMEM55+ population distant from memory cells. By imaging mass cytometry, we find that MZ B cells and memory B cells occupy different microanatomical niches in organised gut lymphoid tissues. Both populations disseminate widely between distant lymphoid tissues and blood, and both diversify their IGHV repertoire in gut germinal centres (GC), but nevertheless remain largely clonally separate. MZ B cells are therefore not developmentally contiguous with or analogous to classical memory B cells despite their shared ability to transit through GC, where somatic mutations are acquired.
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Affiliation(s)
- Yuan Zhao
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Mohamed Uduman
- Department of Pathology, Yale University School of Medicine, New Haven, CT, 06511, USA
| | | | - Thomas J Tull
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Jeremy D Sanderson
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Yu-Chang Bryan Wu
- Randall Division of Cell and Molecular Biophysics, King's College London, London, SE1 1UL, UK
| | - Julian Q Zhou
- Interdepartmental Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06511, USA
| | - Nedyalko Petrov
- Biomedical Research Centre, Guy's and St. Thomas' NHS Trust, London, SE1 9RT, UK
| | - Richard Ellis
- Biomedical Research Centre, Guy's and St. Thomas' NHS Trust, London, SE1 9RT, UK
| | - Katrina Todd
- Biomedical Research Centre, Guy's and St. Thomas' NHS Trust, London, SE1 9RT, UK
| | - Konstantia-Maria Chavele
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - William Guesdon
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Anna Vossenkamper
- Barts & The London School of Medicine and Dentistry, Blizard Institute, Whitechapel, London, E1 2AT, UK
| | - Wayel Jassem
- Liver Transplant Unit, Institute of Liver Studies, King's College Hospital, Denmark Hill, London, SE5 9NT, UK
| | - David P D'Cruz
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - David J Fear
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Susan John
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Dagmar Scheel-Toellner
- Institute of Inflammation and Ageing, College of Medical and Dental Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Claire Hopkins
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Estefania Moreno
- Barts & The London School of Medicine and Dentistry, Blizard Institute, Whitechapel, London, E1 2AT, UK
| | - Natalie L Woodman
- School of Cancer Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Francesca Ciccarelli
- School of Cancer Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK
| | - Susanne Heck
- Biomedical Research Centre, Guy's and St. Thomas' NHS Trust, London, SE1 9RT, UK
| | - Steven H Kleinstein
- Department of Pathology, Yale University School of Medicine, New Haven, CT, 06511, USA.
- Interdepartmental Program in Computational Biology and Bioinformatics, Yale University, New Haven, CT, 06511, USA.
- Department of Immunobiology, Yale University School of Medicine, New Haven, CT, 06511, USA.
| | - Mats Bemark
- Mucosal Immunobiology and Vaccine Center (MIVAC), Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE 405 30, Gothenburg, Sweden.
| | - Jo Spencer
- School of Immunology and Microbial Sciences, King's College London, Guy's Campus, London, SE1 9RT, UK.
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10
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Bemark M. Translating transitions - how to decipher peripheral human B cell development. J Biomed Res 2015; 29:264-84. [PMID: 26243514 PMCID: PMC4547376 DOI: 10.7555/jbr.29.20150035] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2015] [Accepted: 02/10/2015] [Indexed: 01/05/2023] Open
Abstract
During the last two decades our understanding of human B cell differentiation has developed considerably. Our understanding of the human B cell compartment has advanced from a point where essentially all assays were based on the presence or not of class-switched antibodies to a level where a substantial diversity is appreciated among the cells involved. Several consecutive transitional stages that newly formed IgM expressing B cells go through after they leave the bone marrow, but before they are fully mature, have been described, and a significant complexity is also acknowledged within the IgM expressing and class-switched memory B cell compartments. It is possible to isolate plasma blasts in blood to follow the formation of plasma cells during immune responses, and the importance and uniqueness of the mucosal IgA system is now much more appreciated. Current data suggest the presence of at least one lineage of human innate-like B cells akin to B1 and/or marginal zone B cells in mice. In addition, regulatory B cells with the ability to produce IL-10 have been identified. Clinically, B cell depletion therapy is used for a broad range of conditions. The ability to define different human B cell subtypes using flow cytometry has therefore started to come into clinical use, but as our understanding of human B cell development further progresses, B cell subtype analysis will be of increasing importance in diagnosis, to measure the effect of immune therapy and to understand the underlying causes for diseases. In this review the diversity of human B cells will be discussed, with special focus on current data regarding their phenotypes and functions.
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Affiliation(s)
- Mats Bemark
- Department of Clinical Immunology and Transfusion Medicine, Sahlgrenska University hospital, SE 413 45 Gothenburg, Sweden.,Mucosal Immunobiology and Vaccine Center (MIVAC), Department of Microbiology and Immunology, Institute of Biomedicine, Sahlgrenska Academy, University of Gothenburg, SE 405 30 Gothenburg, Sweden.
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