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Newman R, Ahlfors H, Saveliev A, Galloway A, Hodson DJ, Williams R, Besra GS, Cook CN, Cunningham AF, Bell SE, Turner M. Maintenance of the marginal-zone B cell compartment specifically requires the RNA-binding protein ZFP36L1. Nat Immunol 2017; 18:683-693. [PMID: 28394372 PMCID: PMC5438597 DOI: 10.1038/ni.3724] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Accepted: 03/09/2017] [Indexed: 12/15/2022]
Abstract
RNA-binding proteins of the ZFP36 family are best known for inhibiting the expression of cytokines through binding to AU-rich elements in the 3' untranslated region and promoting mRNA decay. Here we identified an indispensable role for ZFP36L1 as the regulator of a post-transcriptional hub that determined the identity of marginal-zone B cells by promoting their proper localization and survival. ZFP36L1 controlled a gene-expression program related to signaling, cell adhesion and locomotion; it achieved this in part by limiting expression of the transcription factors KLF2 and IRF8, which are known to enforce the follicular B cell phenotype. These mechanisms emphasize the importance of integrating transcriptional and post-transcriptional processes by RNA-binding proteins for maintaining cellular identity among closely related cell types.
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Affiliation(s)
- Rebecca Newman
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
- Immune Receptor Activation Laboratory, The Francis Crick Institute,
1 Midland Road, London, NW1 1AT, United Kingdom
| | - Helena Ahlfors
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
| | - Alexander Saveliev
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
| | - Alison Galloway
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
| | - Daniel J Hodson
- Department of Haematology, University of Cambridge, The Clifford
Allbutt Building, Cambridge Biomedical Campus, Hills Road, Cambridge, CB2 0AH,
United Kingdom
| | - Robert Williams
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
| | - Gurdyal S. Besra
- School of Biosciences, University of Birmingham, Birmingham, B15
2TT, United Kingdom
| | - Charlotte N Cook
- MRC Centre for Immune Regulation, School of Immunity and Infection,
University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Adam F Cunningham
- MRC Centre for Immune Regulation, School of Immunity and Infection,
University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Sarah E Bell
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
| | - Martin Turner
- Laboratory of Lymphocyte Signalling and Development, The Babraham
Institute, Babraham Research Campus, Cambridge, CB22 3AT, United Kingdom
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Wells TJ, Davison J, Sheehan E, Kanagasundaram S, Spickett G, MacLennan CA, Stockley RA, Cunningham AF, Henderson IR, De Soyza A. The Use of Plasmapheresis in Patients with Bronchiectasis with Pseudomonas aeruginosa Infection and Inhibitory Antibodies. Am J Respir Crit Care Med 2017; 195:955-958. [DOI: 10.1164/rccm.201603-0599le] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Affiliation(s)
| | | | - Emma Sheehan
- University of BirminghamBirmingham, United Kingdom
| | | | | | | | | | | | | | - Anthony De Soyza
- Freeman HospitalNewcastle, United Kingdom
- Newcastle UniversityNewcastle, United Kingdom
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Pérez-Toledo M, Valero-Pacheco N, Pastelin-Palacios R, Gil-Cruz C, Perez-Shibayama C, Moreno-Eutimio MA, Becker I, Pérez-Tapia SM, Arriaga-Pizano L, Cunningham AF, Isibasi A, Bonifaz LC, López-Macías C. Salmonella Typhi Porins OmpC and OmpF Are Potent Adjuvants for T-Dependent and T-Independent Antigens. Front Immunol 2017; 8:230. [PMID: 28337196 PMCID: PMC5344031 DOI: 10.3389/fimmu.2017.00230] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Accepted: 02/17/2017] [Indexed: 02/05/2023] Open
Abstract
Several microbial components, such as bacterial DNA and flagellin, have been used as experimental vaccine adjuvants because of their inherent capacity to efficiently activate innate immune responses. Likewise, our previous work has shown that the major Salmonella Typhi (S. Typhi) outer membrane proteins OmpC and OmpF (porins) are highly immunogenic protective antigens that efficiently stimulate innate and adaptive immune responses in the absence of exogenous adjuvants. Moreover, S. Typhi porins induce the expression of costimulatory molecules on antigen-presenting cells through toll-like receptor canonical signaling pathways. However, the potential of major S. Typhi porins to be used as vaccine adjuvants remains unknown. Here, we evaluated the adjuvant properties of S. Typhi porins against a range of experimental and clinically relevant antigens. Co-immunization of S. Typhi porins with ovalbumin (OVA), an otherwise poorly immunogenic antigen, enhanced anti-OVA IgG titers, antibody class switching, and affinity maturation. This adjuvant effect was dependent on CD4+ T-cell cooperation and was associated with an increase in IFN-γ, IL-17A, and IL-2 production by OVA-specific CD4+ T cells. Furthermore, co-immunization of S. Typhi porins with an inactivated H1N1 2009 pandemic influenza virus experimental vaccine elicited higher hemagglutinating anti-influenza IgG titers, antibody class switching, and affinity maturation. Unexpectedly, co-administration of S. Typhi porins with purified, unconjugated Vi capsular polysaccharide vaccine (Vi CPS)—a T-independent antigen—induced higher IgG antibody titers and class switching. Together, our results suggest that S. Typhi porins OmpC and OmpF are versatile vaccine adjuvants, which could be used to enhance T-cell immune responses toward a Th1/Th17 profile, while improving antibody responses to otherwise poorly immunogenic T-dependent and T-independent antigens.
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Affiliation(s)
- Marisol Pérez-Toledo
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute, Mexico City, Mexico; Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | - Nuriban Valero-Pacheco
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute, Mexico City, Mexico; Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Mexico City, Mexico
| | | | - Cristina Gil-Cruz
- Institute of Immunobiology, Kantonsspital St. Gallen , St. Gallen , Switzerland
| | | | - Mario A Moreno-Eutimio
- Immunity and Inflammation Research Unit, Hospital Juárez de México, Ministry of Health , Mexico City , Mexico
| | - Ingeborg Becker
- Facultad de Medicina, Departamento de Medicina Experimental, Universidad Nacional Autónoma de México , Mexico City , Mexico
| | - Sonia Mayra Pérez-Tapia
- Unit of R&D in Bioprocesses (UDIBI), Department of Immunology, National School of Biological Sciences, National Polytechnic Institute , Mexico City , Mexico
| | - Lourdes Arriaga-Pizano
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute , Mexico City , Mexico
| | - Adam F Cunningham
- MRC Centre for Immune Regulation, College of Medical and Dental Sciences, Institute of Immunology and Immunotherapy, University of Birmingham , Birmingham , UK
| | - Armando Isibasi
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute , Mexico City , Mexico
| | - Laura C Bonifaz
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute , Mexico City , Mexico
| | - Constantino López-Macías
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre "Siglo XXI", Mexican Social Security Institute, Mexico City, Mexico; Nuffield Department of Medicine, University of Oxford, Oxford, UK
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Dunne KA, Chaudhuri RR, Rossiter AE, Beriotto I, Browning DF, Squire D, Cunningham AF, Cole JA, Loman N, Henderson IR. Sequencing a piece of history: complete genome sequence of the original Escherichia coli strain. Microb Genom 2017; 3:mgen000106. [PMID: 28663823 PMCID: PMC5382810 DOI: 10.1099/mgen.0.000106] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Accepted: 01/24/2017] [Indexed: 12/30/2022] Open
Abstract
In 1885, Theodor Escherich first described the Bacillus coli commune, which was subsequently renamed Escherichia coli. We report the complete genome sequence of this original strain (NCTC 86). The 5 144 392 bp circular chromosome encodes the genes for 4805 proteins, which include antigens, virulence factors, antimicrobial-resistance factors and secretion systems, of a commensal organism from the pre-antibiotic era. It is located in the E. coli A subgroup and is closely related to E. coli K-12 MG1655. E. coli strain NCTC 86 and the non-pathogenic K-12, C, B and HS strains share a common backbone that is largely co-linear. The exception is a large 2 803 932 bp inversion that spans the replication terminus from gmhB to clpB. Comparison with E. coli K-12 reveals 41 regions of difference (577 351 bp) distributed across the chromosome. For example, and contrary to current dogma, E. coli NCTC 86 includes a nine gene sil locus that encodes a silver-resistance efflux pump acquired before the current widespread use of silver nanoparticles as an antibacterial agent, possibly resulting from the widespread use of silver utensils and currency in Germany in the 1800s. In summary, phylogenetic comparisons with other E. coli strains confirmed that the original strain isolated by Escherich is most closely related to the non-pathogenic commensal strains. It is more distant from the root than the pathogenic organisms E. coli 042 and O157 : H7; therefore, it is not an ancestral state for the species.
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Affiliation(s)
- Karl A Dunne
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Roy R Chaudhuri
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield, UK
| | - Amanda E Rossiter
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Irene Beriotto
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Douglas F Browning
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Derrick Squire
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Adam F Cunningham
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Jeffrey A Cole
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Nicholas Loman
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
| | - Ian R Henderson
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, UK
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55
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Pérez-Toledo M, Martínez-Amador PA, Pastelin-Palacios R, Isibasi A, Cunningham AF, López-Macías C. [Purification of Salmonella Typhimurium OmpD porin induces long-term high levels of antibodies: implications on the development of vaccines against non-typhoid salmonella]. GAC MED MEX 2016; 152:5-13. [PMID: 27792711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023] Open
Abstract
In the present work, we report, for the first time, on the purification of the Salmonella Typhimurium OmpD porin. We assessed the integrity and purity of the protein and evaluated the immunogenicity of the protein and its ability to induce antibody without exogenous adjuvant. We observed that 10 μg OmpD induced high antibody levels of IgM and IgG, which were maintained for more than 260 days after immunization. Immunization with OmpD induced multiple IgG antibody isotypes including IgG1, IgG2a, IgG2b, and IgG3 subclasses. Furthermore, these antibodies were able to recognize and bind to the bacterial surface. Our results demonstrate the high immunogenicity of S. Typhimurium OmpD porin, which induces long-lasting antibodies which may be and important target of the immune response against Salmonella infection. In conclusion, we propose the OmpD porin could be used within novel subunit vaccine formulations that do not need additional adjuvant and that confer long lasting humoral immunity against Salmonella infections.
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Affiliation(s)
- Marisol Pérez-Toledo
- Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, IMSS, Ciudad de México, México
- Departamento de Inmunología, Escuela Nacional de Ciencias Biológicas, Instituto Politécnico Nacional, Ciudad de México, México
| | - Paola A Martínez-Amador
- Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, IMSS, Ciudad de México, México
| | | | - Armando Isibasi
- Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, IMSS, Ciudad de México, México
| | - Adam F Cunningham
- Institute of Immunology and Immunotherapy, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Constantino López-Macías
- Unidad de Investigación Médica en Inmunoquímica, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, IMSS, Ciudad de México, México
- Department of Immunology, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
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Hart PJ, O’Shaughnessy CM, Siggins MK, Bobat S, Kingsley RA, Goulding DA, Crump JA, Reyburn H, Micoli F, Dougan G, Cunningham AF, MacLennan CA. Differential Killing of Salmonella enterica Serovar Typhi by Antibodies Targeting Vi and Lipopolysaccharide O:9 Antigen. PLoS One 2016; 11:e0145945. [PMID: 26741681 PMCID: PMC4712142 DOI: 10.1371/journal.pone.0145945] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Accepted: 12/10/2015] [Indexed: 01/08/2023] Open
Abstract
Salmonella enterica serovar Typhi expresses a capsule of Vi polysaccharide, while most Salmonella serovars, including S. Enteritidis and S. Typhimurium, do not. Both S. Typhi and S. Enteritidis express the lipopolysaccharide O:9 antigen, yet there is little evidence of cross-protection from anti-O:9 antibodies. Vaccines based on Vi polysaccharide have efficacy against typhoid fever, indicating that antibodies against Vi confer protection. Here we investigate the role of Vi capsule and antibodies against Vi and O:9 in antibody-dependent complement- and phagocyte-mediated killing of Salmonella. Using isogenic Vi-expressing and non-Vi-expressing derivatives of S. Typhi and S. Typhimurium, we show that S. Typhi is inherently more sensitive to serum and blood than S. Typhimurium. Vi expression confers increased resistance to both complement- and phagocyte-mediated modalities of antibody-dependent killing in human blood. The Vi capsule is associated with reduced C3 and C5b-9 deposition, and decreased overall antibody binding to S. Typhi. However, purified human anti-Vi antibodies in the presence of complement are able to kill Vi-expressing Salmonella, while killing by anti-O:9 antibodies is inversely related to Vi expression. Human serum depleted of antibodies to antigens other than Vi retains the ability to kill Vi-expressing bacteria. Our findings support a protective role for Vi capsule in preventing complement and phagocyte killing of Salmonella that can be overcome by specific anti-Vi antibodies, but only to a limited extent by anti-O:9 antibodies.
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Affiliation(s)
- Peter J. Hart
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Colette M. O’Shaughnessy
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Matthew K. Siggins
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Saeeda Bobat
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Robert A. Kingsley
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - David A. Goulding
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
| | - John A. Crump
- Centre for International Health, University of Otago, Dunedin, New Zealand
- Kilimanjaro Christian Medical Centre and Kilimanjaro Christian Medical University College, Tumaini University, Moshi, Tanzania
- Division of Infectious Diseases and International Health, Duke University Medical Center, Durham, United States of America
- Duke Global Health Institute, Duke University, Durham, United States of America
| | - Hugh Reyburn
- London School of Hygiene and Tropical Medicine, Keppel Street, London, United Kingdom
| | - Francesca Micoli
- Sclavo-Behring Vaccines Institute for Global Health, a GlaxoSmithKline Company, Siena, Italy
| | - Gordon Dougan
- Centre for International Health, University of Otago, Dunedin, New Zealand
| | - Adam F. Cunningham
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Calman A. MacLennan
- School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, United Kingdom
- Jenner Institute, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- * E-mail:
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57
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Johnson N, Cunningham AF. Interplay between rabies virus and the mammalian immune system. World J Clin Infect Dis 2015; 5:67-76. [DOI: 10.5495/wjcid.v5.i4.67] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Revised: 09/23/2015] [Accepted: 11/17/2015] [Indexed: 02/06/2023] Open
Abstract
Rabies is a disease caused following infection of the brain by the rabies virus (RABV). The principle mechanism of transmission is through a bite wound. The virus infects peripheral nerves and moves to the central nervous system (CNS). There appears to be little involvement of other organ systems and little detectable immune stimulation prior to infection of the CNS. This failure of the mammalian immune system to respond to rabies virus infection leads, in the overwhelming majority of cases, to death of the host. To some extent, this failure is likely due to the exclusive replication of RABV in neurons and the limited ability to generate, sufficiently rapidly, an anti-viral antibody response in situ. This is reflected in the ability of post-exposure vaccination, when given early after infection, to prevent disease. The lack of immune stimulation during RABV infection preceding neural invasion is the Achilles heel of the immune response. Whilst many viruses infect the brain, causing encephalitis and neuronal deficit, none are as consistently fatal to the host as RABV. This is in part due to prior replication of many viruses in peripheral, non-neural tissue by other viruses that allows timely activation of the immune response before the host is overwhelmed. Our current understanding of the correlates of protection for rabies suggests that it is the action of neutralising antibodies that prevent infection and control spread of RABV. Furthermore, it tells us that the induction of immunity can protect and understanding how and why this happens is critical to controlling infection. However, the paradigm of antibody development suggests that antigen presentation overwhelmingly occurs in lymphoid tissue (germinal and non-germinal centres) and these are external to the CNS. In addition, the blood-brain-barrier may provide a block to the delivery of immune effectors (antibodies/plasma B-cells) entering where they are needed. Alternatively, there may be insufficient antigen exposure after natural infection to mount an effective response or the virus actively suppresses immune function. To improve our ability to treat this fatal infection it is imperative to understand how immunity to RABV develops and functions so that parameters of protection are better defined.
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Hitchcock JR, Cook CN, Bobat S, Ross EA, Flores-Langarica A, Lowe KL, Khan M, Dominguez-Medina CC, Lax S, Carvalho-Gaspar M, Hubscher S, Rainger GE, Cobbold M, Buckley CD, Mitchell TJ, Mitchell A, Jones ND, Van Rooijen N, Kirchhofer D, Henderson IR, Adams DH, Watson SP, Cunningham AF. Inflammation drives thrombosis after Salmonella infection via CLEC-2 on platelets. J Clin Invest 2015; 125:4429-46. [PMID: 26571395 DOI: 10.1172/jci79070] [Citation(s) in RCA: 114] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Accepted: 10/08/2015] [Indexed: 01/13/2023] Open
Abstract
Thrombosis is a common, life-threatening consequence of systemic infection; however, the underlying mechanisms that drive the formation of infection-associated thrombi are poorly understood. Here, using a mouse model of systemic Salmonella Typhimurium infection, we determined that inflammation in tissues triggers thrombosis within vessels via ligation of C-type lectin-like receptor-2 (CLEC-2) on platelets by podoplanin exposed to the vasculature following breaching of the vessel wall. During infection, mice developed thrombi that persisted for weeks within the liver. Bacteria triggered but did not maintain this process, as thrombosis peaked at times when bacteremia was absent and bacteria in tissues were reduced by more than 90% from their peak levels. Thrombus development was triggered by an innate, TLR4-dependent inflammatory cascade that was independent of classical glycoprotein VI-mediated (GPVI-mediated) platelet activation. After infection, IFN-γ release enhanced the number of podoplanin-expressing monocytes and Kupffer cells in the hepatic parenchyma and perivascular sites and absence of TLR4, IFN-γ, or depletion of monocytic-lineage cells or CLEC-2 on platelets markedly inhibited the process. Together, our data indicate that infection-driven thrombosis follows local inflammation and upregulation of podoplanin and platelet activation. The identification of this pathway offers potential therapeutic opportunities to control the devastating consequences of infection-driven thrombosis without increasing the risk of bleeding.
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López-Macías C, Cunningham AF. Editorial: How Salmonella Infection can Inform on Mechanisms of Immune Function and Homeostasis. Front Immunol 2015; 6:451. [PMID: 26388874 PMCID: PMC4558537 DOI: 10.3389/fimmu.2015.00451] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2015] [Accepted: 08/20/2015] [Indexed: 11/13/2022] Open
Affiliation(s)
- Constantino López-Macías
- Medical Research Unit on Immunochemistry, National Medical Centre "Siglo XXI", Mexican Institute for Social Security, Specialties Hospital , Mexico City , Mexico
| | - Adam F Cunningham
- Institute for Biomedical Research, School of Immunity and Infection, University of Birmingham , Birmingham , UK
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60
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Browning DF, Bavro VN, Mason JL, Sevastsyanovich YR, Rossiter AE, Jeeves M, Wells TJ, Knowles TJ, Cunningham AF, Donald JW, Palmer T, Overduin M, Henderson IR. Cross-species chimeras reveal BamA POTRA and β-barrel domains must be fine-tuned for efficient OMP insertion. Mol Microbiol 2015; 97:646-59. [PMID: 25943387 PMCID: PMC4950039 DOI: 10.1111/mmi.13052] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
BAM is a conserved molecular machine, the central component of which is BamA. Orthologues of BamA are found in all Gram-negative bacteria, chloroplasts and mitochondria where it is required for the folding and insertion of β-barrel containing integral outer membrane proteins (OMPs) into the outer membrane. BamA binds unfolded β-barrel precursors via the five polypeptide transport-associated (POTRA) domains at its N-terminus. The C-terminus of BamA folds into a β-barrel domain, which tethers BamA to the outer membrane and is involved in OMP insertion. BamA orthologues are found in all Gram-negative bacteria and appear to function in a species-specific manner. Here we investigate the nature of this species-specificity by examining whether chimeric Escherichia coli BamA fusion proteins, carrying either the β-barrel or POTRA domains from various BamA orthologues, can functionally replace E. coli BamA. We demonstrate that the β-barrel domains of many BamA orthologues are functionally interchangeable. We show that defects in the orthologous POTRA domains can be rescued by compensatory mutations within the β-barrel. These data reveal that the POTRA and barrel domains must be precisely aligned to ensure efficient OMP insertion.
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Affiliation(s)
- Douglas F Browning
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | - Vassiliy N Bavro
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | - Jessica L Mason
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | | | - Amanda E Rossiter
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | - Mark Jeeves
- School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Timothy J Wells
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | - Timothy J Knowles
- School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Adam F Cunningham
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
| | - James W Donald
- College of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK
| | - Tracy Palmer
- College of Life Sciences, University of Dundee, Dundee, DD1 5EH, UK
| | - Michael Overduin
- School of Cancer Sciences, University of Birmingham, Birmingham, B15 2TT, UK
| | - Ian R Henderson
- Institute of Microbiology and Infection, University of Birmingham, Birmingham, B15 2TT, UK
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61
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Flores-Langarica A, Bobat S, Marshall JL, Yam-Puc JC, Cook CN, Serre K, Kingsley RA, Flores-Romo L, Uematsu S, Akira S, Henderson IR, Toellner KM, Cunningham AF. Soluble flagellin coimmunization attenuates Th1 priming to Salmonella and clearance by modulating dendritic cell activation and cytokine production. Eur J Immunol 2015; 45:2299-311. [PMID: 26036767 PMCID: PMC4973836 DOI: 10.1002/eji.201545564] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2015] [Revised: 05/01/2015] [Accepted: 05/29/2015] [Indexed: 12/25/2022]
Abstract
Soluble flagellin (sFliC) from Salmonella Typhimurium (STm) can induce a Th2 response to itself and coadministered antigens through ligation of TLR5. These properties suggest that sFliC could potentially modulate responses to Th1 antigens like live STm if both antigens are given concurrently. After coimmunization of mice with sFliC and STm there was a reduction in Th1 T cells (T-bet(+) IFN-γ(+) CD4 T cells) compared to STm alone and there was impaired clearance of STm. In contrast, there was no significant defect in the early extrafollicular B-cell response to STm. These effects are dependent upon TLR5 and flagellin expression by STm. The mechanism for these effects is not related to IL-4 induced to sFliC but rather to the effects of sFliC coimmunization on DCs. After coimmunization with STm and sFliC, splenic DCs had a lower expression of costimulatory molecules and profoundly altered kinetics of IL-12 and TNFα expression. Ex vivo experiments using in vivo conditioned DCs confirmed the effects of sFliC were due to altered DC function during a critical window in the coordinated interplay between DCs and naïve T cells. This has marked implications for understanding how limits in Th1 priming can be achieved during infection-induced, Th1-mediated inflammation.
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Affiliation(s)
- Adriana Flores-Langarica
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | - Saeeda Bobat
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | - Jennifer L Marshall
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | | | - Charlotte N Cook
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | - Karine Serre
- Instituto de Medicina Molecular, Faculdade de Medicina, Universidade de Lisboa, Lisbon, Portugal
| | | | | | - Satoshi Uematsu
- International Research and Development Centre for Mucosal Vaccine, Institute for Medical Science, The University of Tokyo, Tokyo, Japan
| | - Shizuo Akira
- Laboratory of Host Defense, World Premier International Immunology Frontier Research Center, Osaka University, Suita Osaka, Japan.,Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Suita Osaka, Japan
| | - Ian R Henderson
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | - Kai M Toellner
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
| | - Adam F Cunningham
- Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
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Ross EA, Smallie T, Ding Q, O'Neil JD, Cunliffe HE, Tang T, Rosner DR, Klevernic I, Morrice NA, Monaco C, Cunningham AF, Buckley CD, Saklatvala J, Dean JL, Clark AR. Dominant Suppression of Inflammation via Targeted Mutation of the mRNA Destabilizing Protein Tristetraprolin. J Immunol 2015; 195:265-76. [PMID: 26002976 PMCID: PMC4472942 DOI: 10.4049/jimmunol.1402826] [Citation(s) in RCA: 59] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2014] [Accepted: 04/27/2015] [Indexed: 02/07/2023]
Abstract
In myeloid cells, the mRNA-destabilizing protein tristetraprolin (TTP) is induced and extensively phosphorylated in response to LPS. To investigate the role of two specific phosphorylations, at serines 52 and 178, we created a mouse strain in which those residues were replaced by nonphosphorylatable alanine residues. The mutant form of TTP was constitutively degraded by the proteasome and therefore expressed at low levels, yet it functioned as a potent mRNA destabilizing factor and inhibitor of the expression of many inflammatory mediators. Mice expressing only the mutant form of TTP were healthy and fertile, and their systemic inflammatory responses to LPS were strongly attenuated. Adaptive immune responses and protection against infection by Salmonella typhimurium were spared. A single allele encoding the mutant form of TTP was sufficient for enhanced mRNA degradation and underexpression of inflammatory mediators. Therefore, the equilibrium between unphosphorylated and phosphorylated TTP is a critical determinant of the inflammatory response, and manipulation of this equilibrium may be a means of treating inflammatory pathologies.
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Affiliation(s)
- Ewan A Ross
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Tim Smallie
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Qize Ding
- Imperial College London, Hammersmith Hospital, London W12 0NN, United Kingdom
| | - John D O'Neil
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Helen E Cunliffe
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Tina Tang
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Dalya R Rosner
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Iva Klevernic
- Unit of Signal Transduction, Interdisciplinary Cluster for Applied Genoproteomics, University of Liege, University Hospital, 4000 Liege, Belgium
| | - Nicholas A Morrice
- Beatson Institute for Cancer Research, Bearsden, Glasgow G61 1BD, United Kingdom; and
| | - Claudia Monaco
- Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, United Kingdom
| | - Adam F Cunningham
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Christopher D Buckley
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Jeremy Saklatvala
- Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, United Kingdom
| | - Jonathan L Dean
- Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Oxford OX3 7FY, United Kingdom
| | - Andrew R Clark
- School of Immunity and Infection, College of Medical and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom;
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Campos J, Nayar S, Chung M, Hitchcock JR, Withers DR, Cunningham AF, Carlesso G, Herbst R, Buckley CD, Barone F. A2.20 ICOS-ICOSL interaction regulates lymphotoxin alpha expression and maturation of lymphoid-like stromal cells during inflammation. Ann Rheum Dis 2015. [DOI: 10.1136/annrheumdis-2015-207259.55] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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Diaz-Muñoz MD, Bell SE, Fairfax K, Monzon-Casanova E, Cunningham AF, Gonzalez-Porta M, Andrews SR, Bunik VI, Zarnack K, Curk T, Heggermont WA, Heymans S, Gibson GE, Kontoyiannis DL, Ule J, Turner M. The RNA-binding protein HuR is essential for the B cell antibody response. Nat Immunol 2015; 16:415-25. [PMID: 25706746 PMCID: PMC4479220 DOI: 10.1038/ni.3115] [Citation(s) in RCA: 97] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 01/28/2015] [Indexed: 12/26/2022]
Abstract
Post-transcriptional regulation of mRNA by the RNA-binding protein HuR (encoded by Elavl1) is required in B cells for the germinal center reaction and for the production of class-switched antibodies in response to thymus-independent antigens. Transcriptome-wide examination of RNA isoforms and their abundance and translation in HuR-deficient B cells, together with direct measurements of HuR-RNA interactions, revealed that HuR-dependent splicing of mRNA affected hundreds of transcripts, including that encoding dihydrolipoamide S-succinyltransferase (Dlst), a subunit of the 2-oxoglutarate dehydrogenase (α-KGDH) complex. In the absence of HuR, defective mitochondrial metabolism resulted in large amounts of reactive oxygen species and B cell death. Our study shows how post-transcriptional processes control the balance of energy metabolism required for the proliferation and differentiation of B cells.
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Affiliation(s)
- Manuel D Diaz-Muñoz
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Cambridge, UK
| | - Sarah E Bell
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Cambridge, UK
| | - Kirsten Fairfax
- 1] Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Cambridge, UK. [2] The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia
| | - Elisa Monzon-Casanova
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Cambridge, UK
| | - Adam F Cunningham
- MRC Centre for Immune Regulation, Institute of Microbiology and Infection, School of Immunity and Infection, University of Birmingham, Birmingham, UK
| | - Mar Gonzalez-Porta
- European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Cambridge, UK
| | | | - Victoria I Bunik
- A. N. Belozersky Institute of PhysicoChemical Biology and Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russia
| | - Kathi Zarnack
- Buchmann Institute for Molecular Life Sciences, Frankfurt, Germany
| | - Tomaž Curk
- University of Ljubljana, Faculty of Computer and Information Science, Ljubljana, Slovenia
| | | | - Stephane Heymans
- 1] Center for Molecular and Vascular Biology, KU Leuven, Belgium. [2] Cardiovascular Research Institute Maastricht, Maastricht University, Maastricht, the Netherlands
| | - Gary E Gibson
- Weill Cornell Medical College, Brain and Mind Research Institute, Burke Medical Research Institute, White Plains, New York, USA
| | - Dimitris L Kontoyiannis
- Division of Immunology, Biomedical Sciences Research Center "Alexander Fleming", Vari, Greece
| | - Jernej Ule
- UCL Genetics Institute, Department of Genetics, Environment and Evolution, University College London, London, UK
| | - Martin Turner
- Laboratory of Lymphocyte Signalling and Development, The Babraham Institute, Cambridge, UK
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Darby M, Schnoeller C, Vira A, Culley FJ, Culley F, Bobat S, Logan E, Kirstein F, Wess J, Cunningham AF, Brombacher F, Selkirk ME, Horsnell WGC. The M3 muscarinic receptor is required for optimal adaptive immunity to helminth and bacterial infection. PLoS Pathog 2015; 11:e1004636. [PMID: 25629518 PMCID: PMC4309615 DOI: 10.1371/journal.ppat.1004636] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 12/18/2014] [Indexed: 01/24/2023] Open
Abstract
Innate immunity is regulated by cholinergic signalling through nicotinic acetylcholine receptors. We show here that signalling through the M3 muscarinic acetylcholine receptor (M3R) plays an important role in adaptive immunity to both Nippostrongylus brasiliensis and Salmonella enterica serovar Typhimurium, as M3R-/- mice were impaired in their ability to resolve infection with either pathogen. CD4 T cell activation and cytokine production were reduced in M3R-/- mice. Immunity to secondary infection with N. brasiliensis was severely impaired, with reduced cytokine responses in M3R-/- mice accompanied by lower numbers of mucus-producing goblet cells and alternatively activated macrophages in the lungs. Ex vivo lymphocyte stimulation of cells from intact BALB/c mice infected with N. brasiliensis and S. typhimurium with muscarinic agonists resulted in enhanced production of IL-13 and IFN-γ respectively, which was blocked by an M3R-selective antagonist. Our data therefore indicate that cholinergic signalling via the M3R is essential for optimal Th1 and Th2 adaptive immunity to infection.
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Affiliation(s)
- Matthew Darby
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
| | - Corinna Schnoeller
- Department of Life Sciences, Sir Ernst Chain Building, South Kensington Campus, Imperial College London, London, United Kingdom
| | - Alykhan Vira
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
| | - Fiona Jane Culley
- National Heart and Lung Institute, St.Mary's Campus, Praed Street, Imperial College London, London, United Kingdom
| | - Fiona Culley
- National Heart and Lung Institute, St.Mary's Campus, Praed Street, Imperial College London, London, United Kingdom
| | - Saeeda Bobat
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection, University of Birmingham, Birmingham, United Kingdom
| | - Erin Logan
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
| | - Frank Kirstein
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
| | - Jürgen Wess
- Molecular Signaling Section, Laboratory of Bioorganic Chemistry, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, Bethesda, Maryland, United States of America
| | - Adam F Cunningham
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection, University of Birmingham, Birmingham, United Kingdom
| | - Frank Brombacher
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
| | - Murray E Selkirk
- Department of Life Sciences, Sir Ernst Chain Building, South Kensington Campus, Imperial College London, London, United Kingdom
| | - William G C Horsnell
- Institute of Infectious Disease and Molecular Medicine, International Centre for Genetic Engineering and Biotechnology and Division of Immunology, University of Cape Town, Cape Town, South Africa
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Cunningham AF, Flores-Langarica A, Bobat S, Dominguez Medina CC, Cook CNL, Ross EA, Lopez-Macias C, Henderson IR. B1b cells recognize protective antigens after natural infection and vaccination. Front Immunol 2014; 5:535. [PMID: 25400633 PMCID: PMC4215630 DOI: 10.3389/fimmu.2014.00535] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 10/10/2014] [Indexed: 12/18/2022] Open
Abstract
There are multiple, distinct B-cell populations in human beings and other animals such as mice. In the latter species, there is a well-characterized subset of B-cells known as B1 cells, which are enriched in peripheral sites such as the peritoneal cavity but are rare in the blood. B1 cells can be further subdivided into B1a and B1b subsets. There may be additional B1 subsets, though it is unclear if these are distinct populations or stages in the developmental process to become mature B1a and B1b cells. A limitation in understanding B1 subsets is the relative paucity of specific surface markers. In contrast to mice, the existence of B1 cells in human beings is controversial and more studies are needed to investigate the nature of these enigmatic cells. Examples of B1b antigens include pneumococcal polysaccharide and the Vi antigen from Salmonella Typhi, both used routinely as vaccines in human beings and experimental antigens such as haptenated-Ficoll. In addition to inducing classical T-dependent responses some proteins are B1b antigens and can induce T-independent (TI) immunity, examples include factor H binding protein from Borrelia hermsii and porins from Salmonella. Therefore, B1b antigens can be proteinaceous or non-proteinaceous, induce TI responses, memory, and immunity, they exist in a diverse range of pathogenic bacteria, and a single species can contain multiple B1b antigens. An unexpected benefit to studying B1b cells is that they appear to have a propensity to recognize protective antigens in bacteria. This suggests that studying B1b cells may be rewarding for vaccine design as immunoprophylactic and immunotherapeutic interventions become more important due to the decreasing efficacy of small molecule antimicrobials.
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Affiliation(s)
- Adam F Cunningham
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Adriana Flores-Langarica
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Saeeda Bobat
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Carmen C Dominguez Medina
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Charlotte N L Cook
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Ewan A Ross
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
| | - Constantino Lopez-Macias
- Medical Research Unit on Immunochemistry, National Medical Centre "Siglo XXI", Specialties Hospital, Mexican Institute for Social Security (IMSS) , Mexico City , Mexico
| | - Ian R Henderson
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of Birmingham , Birmingham , UK
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67
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Bobat S, Cunningham AF. Bacterial infections and vaccines. Adv Exp Med Biol 2014; 828:75-98. [PMID: 25253028 DOI: 10.1007/978-1-4939-1489-0_4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Affiliation(s)
- Saeeda Bobat
- The Institute of Microbiology and Infection, College of Medical and Dental Sciences, University of Birmingham, Edgbaston, Birmingham, West Midlands, UK,
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68
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Wells TJ, Whitters D, Sevastsyanovich YR, Heath JN, Pravin J, Goodall M, Browning DF, O'Shea MK, Cranston A, De Soyza A, Cunningham AF, MacLennan CA, Henderson IR, Stockley RA. Increased severity of respiratory infections associated with elevated anti-LPS IgG2 which inhibits serum bactericidal killing. ACTA ACUST UNITED AC 2014; 211:1893-904. [PMID: 25113975 PMCID: PMC4144740 DOI: 10.1084/jem.20132444] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
An antibody directed against the O-antigen of Pseudomonas aeruginosa LPS can block complement-mediated bacterial killing and contributes to the severity of respiratory infection. Although specific antibody induced by pathogens or vaccines is a key component of protection against infectious threats, some viruses, such as dengue, induce antibody that enhances the development of infection. In contrast, antibody-dependent enhancement of bacterial infection is largely unrecognized. Here, we demonstrate that in a significant portion of patients with bronchiectasis and Pseudomonas aeruginosa lung infection, antibody can protect the bacterium from complement-mediated killing. Strains that resist antibody-induced, complement-mediated killing produce lipopolysaccharide containing O-antigen. The inhibition of antibody-mediated killing is caused by excess production of O-antigen–specific IgG2 antibodies. Depletion of IgG2 to O-antigen restores the ability of sera to kill strains with long-chain O-antigen. Patients with impaired serum-mediated killing of P. aeruginosa by IgG2 have poorer respiratory function than infected patients who do not produce inhibitory antibody. We suggest that excessive binding of IgG2 to O-antigen shields the bacterium from other antibodies that can induce complement-mediated killing of bacteria. As there is significant sharing of O-antigen structure between different Gram-negative bacteria, this IgG2-mediated impairment of killing may operate in other Gram-negative infections. These findings have marked implications for our understanding of protection generated by natural infection and for the design of vaccines, which should avoid inducing such blocking antibodies.
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Affiliation(s)
- Timothy J Wells
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Deborah Whitters
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Lung Investigation Unit, Queen Elizabeth Hospital, Birmingham B15 2TH, England, UK
| | - Yanina R Sevastsyanovich
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Jennifer N Heath
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - John Pravin
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Margaret Goodall
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Douglas F Browning
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Matthew K O'Shea
- The University of Oxford, The Jenner Institute, Oxford OX3 7DQ, England, UK
| | - Amy Cranston
- Sir William Leech Centre for Respiratory Research Newcastle upon Tyne Hospitals Trust, Newcastle NE7 7DN, England, UK
| | - Anthony De Soyza
- Institute of Cellular Medicine, Newcastle University and Adult Bronchiectasis service Freeman Hospital, Newcastle NE7 7DN, England, UK
| | - Adam F Cunningham
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Calman A MacLennan
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Ian R Henderson
- Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK Institute of Microbiology and Infection, School of Immunity and Infection, School Clinical and Experimental Medicine, University of Birmingham, Birmingham B15 2TT, England, UK
| | - Robert A Stockley
- Lung Investigation Unit, Queen Elizabeth Hospital, Birmingham B15 2TH, England, UK
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69
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Reynolds LA, Harcus Y, Smith KA, Webb LM, Hewitson JP, Ross EA, Brown S, Uematsu S, Akira S, Gray D, Gray M, MacDonald AS, Cunningham AF, Maizels RM. MyD88 signaling inhibits protective immunity to the gastrointestinal helminth parasite Heligmosomoides polygyrus. J Immunol 2014; 193:2984-93. [PMID: 25114104 PMCID: PMC4157852 DOI: 10.4049/jimmunol.1401056] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Helminth parasites remain one of the most common causes of infections worldwide, yet little is still known about the immune signaling pathways that control their expulsion. C57BL/6 mice are chronically susceptible to infection with the gastrointestinal helminth parasite Heligmosomoides polygyrus. In this article, we report that C57BL/6 mice lacking the adapter protein MyD88, which mediates signaling by TLRs and IL-1 family members, showed enhanced immunity to H. polygyrus infection. Alongside increased parasite expulsion, MyD88-deficient mice showed heightened IL-4 and IL-17A production from mesenteric lymph node CD4+ cells. In addition, MyD88−/− mice developed substantial numbers of intestinal granulomas around the site of infection, which were not seen in MyD88-sufficient C57BL/6 mice, nor when signaling through the adapter protein TRIF (TIR domain–containing adapter–inducing IFN-β adapter protein) was also ablated. Mice deficient solely in TLR2, TLR4, TLR5, or TLR9 did not show enhanced parasite expulsion, suggesting that these TLRs signal redundantly to maintain H. polygyrus susceptibility in wild-type mice. To further investigate signaling pathways that are MyD88 dependent, we infected IL-1R1−/− mice with H. polygyrus. This genotype displayed heightened granuloma numbers compared with wild-type mice, but without increased parasite expulsion. Thus, the IL-1R–MyD88 pathway is implicated in inhibiting granuloma formation; however, protective immunity in MyD88-deficient mice appears to be granuloma independent. Like IL-1R1−/− and MyD88−/− mice, animals lacking signaling through the type 1 IFN receptor (i.e., IFNAR1−/−) also developed intestinal granulomas. Hence, IL-1R1, MyD88, and type 1 IFN receptor signaling may provide pathways to impede granuloma formation in vivo, but additional MyD88-mediated signals are associated with inhibition of protective immunity in susceptible C57BL/6 mice.
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Affiliation(s)
- Lisa A Reynolds
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Yvonne Harcus
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Katherine A Smith
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Lauren M Webb
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - James P Hewitson
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Ewan A Ross
- Medical Research Council Centre for Immune Regulation, Institute of Microbiology and Infection, School of Immunity and Infection, University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Sheila Brown
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Satoshi Uematsu
- Division of Innate Immune Regulation, International Research and Development Center for Mucosal Vaccines, Institute of Medical Science, The University of Tokyo, Shirokanedai, Minato-ku, Tokyo, 108-8639, Japan
| | - Shizuo Akira
- Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Suita, Osaka 565-0871, Japan; and Laboratory of Host Defense, World Premier Institute Immunology Frontier Research Center, Osaka University, Suita, Osaka 565-0871, Japan
| | - David Gray
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Mohini Gray
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Andrew S MacDonald
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom
| | - Adam F Cunningham
- Medical Research Council Centre for Immune Regulation, Institute of Microbiology and Infection, School of Immunity and Infection, University of Birmingham, Birmingham, B15 2TT, United Kingdom
| | - Rick M Maizels
- Institute of Immunology and Infection Research, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom; Centre for Immunity, Infection and Evolution, University of Edinburgh, Edinburgh, EH9 3JT, United Kingdom;
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70
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Ross EA, Flores-Langarica A, Bobat S, Coughlan RE, Marshall JL, Hitchcock JR, Cook CN, Carvalho-Gaspar MM, Mitchell AM, Clarke M, Garcia P, Cobbold M, Mitchell TJ, Henderson IR, Jones ND, Anderson G, Buckley CD, Cunningham AF. Resolving Salmonella infection reveals dynamic and persisting changes in murine bone marrow progenitor cell phenotype and function. Eur J Immunol 2014; 44:2318-30. [PMID: 24825601 PMCID: PMC4209805 DOI: 10.1002/eji.201344350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2013] [Revised: 04/07/2014] [Accepted: 05/08/2014] [Indexed: 11/15/2022]
Abstract
The generation of immune cells from BM precursors is a carefully regulated process. This is essential to limit the potential for oncogenesis and autoimmunity yet protect against infection. How infection modulates this is unclear. Salmonella can colonize systemic sites including the BM and spleen. This resolving infection has multiple IFN-γ-mediated acute and chronic effects on BM progenitors, and during the first week of infection IFN-γ is produced by myeloid, NK, NKT, CD4(+) T cells, and some lineage-negative cells. After infection, the phenotype of BM progenitors rapidly but reversibly alters, with a peak ∼ 30-fold increase in Sca-1(hi) progenitors and a corresponding loss of Sca-1(lo/int) subsets. Most strikingly, the capacity of donor Sca-1(hi) cells to reconstitute an irradiated host is reduced; the longer donor mice are exposed to infection, and Sca-1(hi) c-kit(int) cells have an increased potential to generate B1a-like cells. Thus, Salmonella can have a prolonged influence on BM progenitor functionality not directly related to bacterial persistence. These results reflect changes observed in leucopoiesis during aging and suggest that BM functionality can be modulated by life-long, periodic exposure to infection. Better understanding of this process could offer novel therapeutic opportunities to modulate BM functionality and promote healthy aging.
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Affiliation(s)
- Ewan A Ross
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Adriana Flores-Langarica
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Saeeda Bobat
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Ruth E Coughlan
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Jennifer L Marshall
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Jessica R Hitchcock
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Charlotte N Cook
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Manuela M Carvalho-Gaspar
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Andrea M Mitchell
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Mary Clarke
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Paloma Garcia
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Mark Cobbold
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Tim J Mitchell
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Ian R Henderson
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Nick D Jones
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Graham Anderson
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Christopher D Buckley
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
| | - Adam F Cunningham
- MRC Centre for Immune Regulation, Institute for Microbiology and Infection, School of Immunity and Infection, Institute for Biomedical Research, Medical School, University of BirminghamEdgbaston, Birmingham, UK
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O'Shea MK, Fletcher TE, Beeching NJ, Dedicoat M, Spence D, McShane H, Cunningham AF, Wilson D. Tuberculin skin testing and treatment modulates interferon-gamma release assay results for latent tuberculosis in migrants. PLoS One 2014; 9:e97366. [PMID: 24816576 PMCID: PMC4016319 DOI: 10.1371/journal.pone.0097366] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2014] [Accepted: 04/17/2014] [Indexed: 11/18/2022] Open
Abstract
Background Identifying latent tuberculosis infection (LTBI) in people migrating from TB endemic regions to low incidence countries is an important control measure. However, no prospective longitudinal comparisons between diagnostic tests used in such migrant populations are available. Objectives To compare commercial interferon (IFN)-gamma release assays (IGRAs) and the tuberculin skin test (TST) for diagnosing LTBI in a migrant population, and the influence of antecedent TST and LTBI treatment on IGRA performance. Materials and Methods This cohort study, performed from February to September 2012, assessed longitudinal IGRA and TST responses in Nepalese military recruits recently arrived in the UK. Concomitant T-SPOT.TB, QFT-GIT and TST were performed on day 0, with IGRAs repeated 7 and 200 days later, following treatment for LTBI if necessary. Results 166 Nepalese recruits were prospectively assessed. At entry, 21 individuals were positive by T-SPOT.TB and 8 individuals by QFT-GIT. There was substantial agreement between TST and T-SPOT.TB positives at baseline (71.4% agreement; κ = 0.62; 95% CI:0.44–0.79), but only moderate concordance between positive IGRAs (38.1% agreement; κ = 0.46; 95% CI:0.25–0.67). When reassessed 7 days following TST, numbers of IGRA-positive individuals changed from 8 to 23 for QFT-GIT (p = 0.0074) and from 21 to 23 for T-SPOT.TB (p = 0.87). This resulted in an increase in IGRA concordance to substantial (64.3% agreement; κ = 0.73; 95% CI:0.58-0.88). Thus, in total on day 0 and day 7 after testing, 29 out of 166 participants (17.5%) provided a positive IGRA and of these 13 were TST negative. Two hundred days after the study commenced and three months after treatment for LTBI was completed by those who were given chemoprophylaxis, 23 and 21 participants were positive by T-SPOT.TB or QFT-GIT respectively. When individual responses were examined longitudinally within this population 35% of the day 7 QFT-GIT-positive, and 19% T-SPOT.TB-positive individuals, were negative by IGRA. When the change in the levels of secreted IFN-γ was examined after chemoprophylaxis the median levels were found to have fallen dramatically by 77.3% from a pre-treatment median concentration of IFN-γ 2.73 IU/ml to a post-treatment median concentration IFN-γ 0.62 (p = 0.0002). Conclusions This study suggests differences in the capacity of commercially available IGRAs to identify LTBI in the absence of antecedent TST and that IGRAs, in the time periods examined, may not be the optimal tests to determine the success of chemoprophylaxis for LTBI.
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Affiliation(s)
- Matthew K. O'Shea
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
- School of Immunity and Infection, MRC Centre for Immune Regulation, University of Birmingham Edgbaston, Birmingham, United Kingdom
| | | | | | - Martin Dedicoat
- Department of Infectious Disease and Tropical Medicine, Heartlands Hospital, Birmingham, United Kingdom
| | - David Spence
- Department of Respiratory Medicine, The Friarage Hospital, Northallerton, United Kingdom
| | - Helen McShane
- The Jenner Institute, Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Adam F. Cunningham
- School of Immunity and Infection, MRC Centre for Immune Regulation, University of Birmingham Edgbaston, Birmingham, United Kingdom
- * E-mail:
| | - Duncan Wilson
- Royal Centre for Defence Medicine (Academia and Research), Joint Medical Command, Birmingham, United Kingdom
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72
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Siggins MK, O'Shaughnessy CM, Pravin J, Cunningham AF, Henderson IR, Drayson MT, MacLennan CA. Differential timing of antibody-mediated phagocytosis and cell-free killing of invasive African Salmonella allows immune evasion. Eur J Immunol 2014; 44:1093-8. [PMID: 24375424 DOI: 10.1002/eji.201343529] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2013] [Revised: 10/17/2013] [Accepted: 12/19/2013] [Indexed: 11/07/2022]
Abstract
Nontyphoidal Salmonellae commonly cause fatal bacteraemia in African children lacking anti-Salmonella antibodies. These are facultative intracellular bacteria capable of cell-free and intracellular survival within macrophages. To better understand the relationship between extracellular and intracellular infection in blood and general mechanisms of Ab-related protection against Salmonella, we used human blood and sera to measure kinetics of Ab and complement deposition, serum-mediated bactericidal killing and phagocytosis of invasive African Salmonella enterica serovar Typhimurium D23580. Binding of antibodies peaked by 30 s, but C3 deposition lagged behind, peaking after 2-4 min. C5b-9 deposition was undetectable until between 2 and 6 min and peaked after 10 min, after which time an increase in serum-mediated killing occurred. In contrast, intracellular, opsonized Salmonellae were readily detectable within 5 min. By 10 min, around half of monocytes and most neutrophils contained bacteria. The same kinetics of serum-mediated killing and phagocytosis were observed with S. enterica Typhimurium laboratory strain SL1344, and the S. enterica Enteritidis African invasive isolate D24954 and laboratory strain PT4. The differential kinetics between cell-free killing and phagocytosis of invasive nontyphoidal Salmonella allows these bacteria to escape the blood and establish intracellular infection before they are killed by the membrane attack complex.
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Affiliation(s)
- Matthew K Siggins
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, UK; Novartis Vaccines Institute for Global Health, Siena, Italy
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73
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Browning DF, Matthews SA, Rossiter AE, Sevastsyanovich YR, Jeeves M, Mason JL, Wells TJ, Wardius CA, Knowles TJ, Cunningham AF, Bavro VN, Overduin M, Henderson IR. Mutational and topological analysis of the Escherichia coli BamA protein. PLoS One 2013; 8:e84512. [PMID: 24376817 PMCID: PMC3871556 DOI: 10.1371/journal.pone.0084512] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Accepted: 11/15/2013] [Indexed: 11/18/2022] Open
Abstract
The multi-protein β-barrel assembly machine (BAM) of Escherichia coli is responsible for the folding and insertion of β-barrel containing integral outer membrane proteins (OMPs) into the bacterial outer membrane. An essential component of this complex is the BamA protein, which binds unfolded β-barrel precursors via the five polypeptide transport-associated (POTRA) domains in its N-terminus. The C-terminus of BamA contains a β-barrel domain, which tethers BamA to the outer membrane and is also thought to be involved in OMP insertion. Here we mutagenize BamA using linker scanning mutagenesis and demonstrate that all five POTRA domains are essential for BamA protein function in our experimental system. Furthermore, we generate a homology based model of the BamA β-barrel and test our model using insertion mutagenesis, deletion analysis and immunofluorescence to identify β-strands, periplasmic turns and extracellular loops. We show that the surface-exposed loops of the BamA β-barrel are essential.
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Affiliation(s)
- Douglas F. Browning
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
- * E-mail: (DFB); (IRH)
| | - Sophie A. Matthews
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Amanda E. Rossiter
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Yanina R. Sevastsyanovich
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Mark Jeeves
- School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Jessica L. Mason
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Timothy J. Wells
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Catherine A. Wardius
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Timothy J. Knowles
- School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Adam F. Cunningham
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Vassiliy N. Bavro
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
| | - Michael Overduin
- School of Cancer Sciences, University of Birmingham, Edgbaston, Birmingham, United Kingdom
| | - Ian R. Henderson
- Institute of Microbiology and Infection, School of Biosciences, University of Birmingham, Birmingham, United Kingdom
- * E-mail: (DFB); (IRH)
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74
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Browning DF, Wells TJ, França FLS, Morris FC, Sevastsyanovich YR, Bryant JA, Johnson MD, Lund PA, Cunningham AF, Hobman JL, May RC, Webber MA, Henderson IR. Laboratory adapted Escherichia coli K-12 becomes a pathogen of Caenorhabditis elegans upon restoration of O antigen biosynthesis. Mol Microbiol 2013; 87:939-50. [PMID: 23350972 DOI: 10.1111/mmi.12144] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/20/2012] [Indexed: 01/13/2023]
Abstract
Escherichia coli has been the leading model organism for many decades. It is a fundamental player in modern biology, facilitating the molecular biology revolution of the last century. The acceptance of E. coli as model organism is predicated primarily on the study of one E. coli lineage; E. coli K-12. However, the antecedents of today's laboratory strains have undergone extensive mutagenesis to create genetically tractable offspring but which resulted in loss of several genetic traits such as O antigen expression. Here we have repaired the wbbL locus, restoring the ability of E. coli K-12 strain MG1655 to express the O antigen. We demonstrate that O antigen production results in drastic alterations of many phenotypes and the density of the O antigen is critical for the observed phenotypes. Importantly, O antigen production enables laboratory strains of E. coli to enter the gut of the Caenorhabditis elegans worm and to kill C. elegans at rates similar to pathogenic bacterial species. We demonstrate C. elegans killing is a feature of other commensal E. coli. We show killing is associated with bacterial resistance to mechanical shear and persistence in the C. elegans gut. These results suggest C. elegans is not an effective model of human-pathogenic E. coli infectious disease.
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Affiliation(s)
- Douglas F Browning
- School of Immunity and Infection, University of Birmingham, Birmingham, UK.
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75
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Flores-Langarica A, Marshall JL, Hitchcock J, Cook C, Jobanputra J, Bobat S, Ross EA, Coughlan RE, Henderson IR, Uematsu S, Akira S, Cunningham AF. Systemic flagellin immunization stimulates mucosal CD103+ dendritic cells and drives Foxp3+ regulatory T cell and IgA responses in the mesenteric lymph node. J Immunol 2012; 189:5745-54. [PMID: 23152564 DOI: 10.4049/jimmunol.1202283] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Mucosal immunity is poorly activated after systemic immunization with protein Ags. Nevertheless, induction of mucosal immunity in such a manner would be an attractive and simple way to overcome the intrinsic difficulties in delivering Ag to such sites. Flagellin from Salmonella enterica serovar Typhimurium (FliC) can impact markedly on host immunity, in part via its recognition by TLR5. In this study, we show that systemic immunization with soluble FliC (sFliC) drives distinct immune responses concurrently in the mesenteric lymph nodes (MLN) and the spleen after i.p. and s.c. immunization. In the MLN, but not the spleen, sFliC drives a TLR5-dependent recruitment of CD103(+) dendritic cells (DCs), which correlates with a diminution in CD103(+) DC numbers in the lamina propria. In the MLN, CD103(+) DCs carry Ag and are the major primers of endogenous and transgenic T cell priming. A key consequence of these interactions with CD103(+) DCs in the MLN is an increase in local regulatory T cell differentiation. In parallel, systemic sFliC immunization results in a pronounced switching of FliC-specific B cells to IgA in the MLN but not elsewhere. Loss of TLR5 has more impact on MLN than splenic Ab responses, reflected in an ablation of IgA, but not IgG, serum Ab titers. Therefore, systemic sFliC immunization targets CD103(+) DCs and drives distinct mucosal T and B cell responses. This offers a potential "Trojan horse" approach to modulate mucosal immunity by systemically immunizing with sFliC.
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Affiliation(s)
- Adriana Flores-Langarica
- Medical Research Council Centre for Immune Regulation, Division of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham B15 2TT, United Kingdom
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76
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Marshall JL, Flores-Langarica A, Kingsley RA, Hitchcock JR, Ross EA, Lopez-Macias C, Lakey J, Martin LB, Toellner KM, MacLennan CA, MacLennan IC, Henderson IR, Dougan G, Cunningham AF. The capsular polysaccharide Vi from Salmonella typhi is a B1b antigen. J Immunol 2012; 189:5527-32. [PMID: 23162127 PMCID: PMC3605773 DOI: 10.4049/jimmunol.1103166] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Vaccination with purified capsular polysaccharide Vi Ag from Salmonella typhi can protect against typhoid fever, although the mechanism for its efficacy is not clearly established. In this study, we have characterized the B cell response to this vaccine in wild-type and T cell-deficient mice. We show that immunization with typhoid Vi polysaccharide vaccine rapidly induces proliferation in B1b peritoneal cells, but not in B1a cells or marginal zone B cells. This induction of B1b proliferation is concomitant with the detection of splenic Vi-specific Ab-secreting cells and protective Ab in Rag1-deficient B1b cell chimeras generated by adoptive transfer-induced specific Ab after Vi immunization. Furthermore, Ab derived from peritoneal B cells is sufficient to confer protection against Salmonella that express Vi Ag. Expression of Vi by Salmonella during infection did not inhibit the development of early Ab responses to non-Vi Ags. Despite this, the protection conferred by immunization of mice with porin proteins from Salmonella, which induce Ab-mediated protection, was reduced postinfection with Vi-expressing Salmonella, although protection was not totally abrogated. This work therefore suggests that, in mice, B1b cells contribute to the protection induced by Vi Ag, and targeting non-Vi Ags as subunit vaccines may offer an attractive strategy to augment current Vi-based vaccine strategies.
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Affiliation(s)
- Jennifer L. Marshall
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Adriana Flores-Langarica
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Robert A. Kingsley
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK
| | - Jessica R. Hitchcock
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ewan A. Ross
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Constantino Lopez-Macias
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre “Siglo XXI” Mexican Institute for Social Security (IMSS), Mexico City, Mexico
| | - Jeremy Lakey
- Institute for Cell and Molecular Biosciences, University of Newcastle, Newcastle upon Tyne, NE2 4HH, UK
| | - Laura B. Martin
- Novartis Vaccines Institute for Global Health, Via Fiorentina 1, 53100 Siena, Italy
| | - Kai-Michael Toellner
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Calman A. MacLennan
- Novartis Vaccines Institute for Global Health, Via Fiorentina 1, 53100 Siena, Italy
| | - Ian C MacLennan
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ian R. Henderson
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gordon Dougan
- Wellcome Trust Sanger Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, CB10 1SA, UK
| | - Adam F. Cunningham
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection and Institute for Biomedical Research, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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77
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O’Shaughnessy CM, Cunningham AF, MacLennan CA. The stability of complement-mediated bactericidal activity in human serum against Salmonella. PLoS One 2012; 7:e49147. [PMID: 23145102 PMCID: PMC3493494 DOI: 10.1371/journal.pone.0049147] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2012] [Accepted: 10/04/2012] [Indexed: 11/19/2022] Open
Abstract
The complement cascade includes heat-labile proteins and care is required when handling serum in order to preserve its functional integrity. We have previously used a whole human serum bactericidal assay to show that antibody and an intact complement system are required in blood for killing of invasive isolates of Salmonella. The aim of the present study was to evaluate the conditions under which human serum can be stored and manipulated while maintaining complement integrity. Serum bactericidal activity against Salmonella was maintained for a minimum of 35 days when stored at 4°C, eight days at 22°C and 54 hours at 37°C. Up to three freeze-thaw cycles had no effect on the persistence of bactericidal activity and hemolytic complement assays confirmed no effect on complement function. Delay in the separation of serum for up to four days from clotted blood stored at 22°C did not affect bactericidal activity. Dilution of serum resulted in an increased rate of loss of bactericidal activity and so serum should be stored undiluted. These findings indicate that the current guidelines concerning manipulation and storage of human serum to preserve complement integrity and function leave a large margin for safety with regards to bactericidal activity against Salmonella. The study provides a scheme for determining the requirements for serum handling in relation to functional activity of complement in other systems.
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Affiliation(s)
- Colette M. O’Shaughnessy
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Novartis Vaccines Institute for Global Health, Siena, Italy
| | - Adam F. Cunningham
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Calman A. MacLennan
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
- Novartis Vaccines Institute for Global Health, Siena, Italy
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78
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Ross EA, Coughlan RE, Flores-Langarica A, Lax S, Nicholson J, Desanti GE, Marshall JL, Bobat S, Hitchcock J, White A, Jenkinson WE, Khan M, Henderson IR, Lavery GG, Buckley CD, Anderson G, Cunningham AF. Thymic function is maintained during Salmonella-induced atrophy and recovery. J Immunol 2012; 189:4266-74. [PMID: 22993205 PMCID: PMC3912538 DOI: 10.4049/jimmunol.1200070] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Thymic atrophy is a frequent consequence of infection with bacteria, viruses, and parasites and is considered a common virulence trait between pathogens. Multiple reasons have been proposed to explain this atrophy, including premature egress of immature thymocytes, increased apoptosis, or thymic shutdown to prevent tolerance to the pathogen from developing. The severe loss in thymic cell number can reflect an equally dramatic reduction in thymic output, potentially reducing peripheral T cell numbers. In this study, we examine the relationship between systemic Salmonella infection and thymic function. During infection, naive T cell numbers in peripheral lymphoid organs increase. Nevertheless, this occurs despite a pronounced thymic atrophy caused by viable bacteria, with a peak 50-fold reduction in thymocyte numbers. Thymic atrophy is not dependent upon homeostatic feedback from peripheral T cells or on regulation of endogenous glucocorticoids, as demonstrated by infection of genetically altered mice. Once bacterial numbers fall, thymocyte numbers recover, and this is associated with increases in the proportion and proliferation of early thymic progenitors. During atrophy, thymic T cell maturation is maintained, and single-joint TCR rearrangement excision circle analysis reveals there is only a modest fall in recent CD4(+) thymic emigrants in secondary lymphoid tissues. Thus, thymic atrophy does not necessarily result in a matching dysfunctional T cell output, and thymic homeostasis can constantly adjust to systemic infection to ensure that naive T cell output is maintained.
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Affiliation(s)
- Ewan A. Ross
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ruth E. Coughlan
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Adriana Flores-Langarica
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Sian Lax
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Julia Nicholson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Guillaume E. Desanti
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jennifer L. Marshall
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Saeeda Bobat
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Jessica Hitchcock
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Andrea White
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - William E. Jenkinson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Mahmood Khan
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Ian R. Henderson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Gareth G. Lavery
- Centre for Endocrinology, Diabetes and Metabolism, School of Clinical and Experimental Medicine, Institute for Biomedical Research, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Christopher D. Buckley
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Graham Anderson
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Adam F. Cunningham
- MRC centre for Immune Regulation, School of Immunity and Infection, Medical School, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
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79
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Lax S, Ross EA, White A, Marshall JL, Jenkinson WE, Isacke CM, Huso DL, Cunningham AF, Anderson G, Buckley CD. CD248 expression on mesenchymal stromal cells is required for post-natal and infection-dependent thymus remodelling and regeneration. FEBS Open Bio 2012; 2:187-90. [PMID: 23650598 PMCID: PMC3642154 DOI: 10.1016/j.fob.2012.07.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2012] [Revised: 07/04/2012] [Accepted: 07/10/2012] [Indexed: 02/02/2023] Open
Abstract
The role of mesenchymal stromal cells (MSCs) in regulating immune responses in the thymus is currently unclear. Here we report the existence and role of a MSC population in the thymus that expresses the pericyte and MSC marker CD248 (endosialin). We show using a CD248-deficient mouse model, that CD248 expression on these cells is required for full post-natal thymus development and regeneration post-Salmonella infection. In CD248−/− mice the thymus is hypocellular and regeneration is poorer, with significant loss of all thymocyte populations. This identifies the requirement of CD248 to maintain optimal thymic cellularity post-partum and infection.
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Affiliation(s)
- Siân Lax
- Rheumatology Research Group, Institute of Biomedical Research, University of Birmingham, UK ; MRC Centre for Immune Regulation, University of Birmingham, UK
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80
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Sevastsyanovich YR, Leyton DL, Wells TJ, Wardius CA, Tveen-Jensen K, Morris FC, Knowles TJ, Cunningham AF, Cole JA, Henderson IR. A generalised module for the selective extracellular accumulation of recombinant proteins. Microb Cell Fact 2012; 11:69. [PMID: 22640772 PMCID: PMC3419692 DOI: 10.1186/1475-2859-11-69] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2012] [Accepted: 05/11/2012] [Indexed: 11/10/2022] Open
Abstract
Background It is widely believed that laboratory strains of Escherichia coli, including those used for industrial production of proteins, do not secrete proteins to the extracellular milieu. Results Here, we report the development of a generalised module, based on an E. coli autotransporter secretion system, for the production of extracellular recombinant proteins. We demonstrate that a wide variety of structurally diverse proteins can be secreted as soluble proteins when linked to the autotransporter module. Yields were comparable to those achieved with other bacterial secretion systems. Conclusions The advantage of this module is that it relies on a relatively simple and easily manipulated secretion system, exhibits no apparent limitation to the size of the secreted protein and can deliver proteins to the extracellular environment at levels of purity and yields sufficient for many biotechnological applications.
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Affiliation(s)
- Yanina R Sevastsyanovich
- School of Immunity and Infection, University of Birmingham, Edgbaston, Birmingham B15 2TT, United Kingdom
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81
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Buchan SL, Taraban VY, Slebioda TJ, James S, Cunningham AF, Al-Shamkhani A. Death receptor 3 is essential for generating optimal protective CD4⁺ T-cell immunity against Salmonella. Eur J Immunol 2012; 42:580-8. [PMID: 22259035 DOI: 10.1002/eji.201041950] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2011] [Revised: 10/24/2011] [Accepted: 11/16/2011] [Indexed: 11/12/2022]
Abstract
The TNF receptor superfamily member death receptor 3 (DR3) exacerbates Th2- and Th17-cell-mediated inflammatory and autoimmune conditions, yet no role in host defence has been reported. Here, we examined the role of DR3 during infection with Salmonella enterica serovar Typhimurium. Infection resulted in protracted expression of the DR3 ligand TL1A but not the related TNF superfamily proteins OX40L or CD30L. TL1A expression was localized to splenic F4/80(+) macrophages where S. enterica Typhimurium replicates, and temporally coincided with the onset of CD4(+) -cell expansion. To address the relevance of the TL1A-DR3 interaction, we examined immune responses to S. enterica Typhimurium in mice lacking DR3. Infected DR3(-/-) mice harboured reduced numbers of antigen-experienced and proliferating CD4(+) T cells compared with WT mice. Furthermore, the frequency of IFN-γ(+) CD4(+) T cells in DR3(-/-) mice was lower throughout the time of bacterial clearance. Importantly, bacterial clearance, which is dependent on Th1 cells, was also impaired in DR3(-/-) mice. This defect was intrinsic to CD4(+) T cells as evidenced by an increase in bacterial burden in RAG2-deficient mice receiving DR3(-/-) CD4(+) T cells compared with WT CD4(+) -cell recipients. These data establish for the first time a role for DR3 in a host defence response.
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Affiliation(s)
- Sarah L Buchan
- Cancer Sciences Unit, Faculty of Medicine, University of Southampton, Southampton General Hospital, Southampton, UK
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82
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Leyton DL, Sevastsyanovich YR, Browning DF, Rossiter AE, Wells TJ, Fitzpatrick RE, Overduin M, Cunningham AF, Henderson IR. Size and conformation limits to secretion of disulfide-bonded loops in autotransporter proteins. J Biol Chem 2011; 286:42283-42291. [PMID: 22006918 PMCID: PMC3234927 DOI: 10.1074/jbc.m111.306118] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2011] [Revised: 10/13/2011] [Indexed: 01/06/2023] Open
Abstract
Autotransporters are a superfamily of virulence factors typified by a channel-forming C terminus that facilitates translocation of the functional N-terminal passenger domain across the outer membrane of Gram-negative bacteria. This final step in the secretion of autotransporters requires a translocation-competent conformation for the passenger domain that differs markedly from the structure of the fully folded secreted protein. The nature of the translocation-competent conformation remains controversial, in particular whether the passenger domain can adopt secondary structural motifs, such as disulfide-bonded segments, while maintaining a secretion-competent state. Here, we used the endogenous and closely spaced cysteine residues of the plasmid-encoded toxin (Pet) from enteroaggregative Escherichia coli to investigate the effect of disulfide bond-induced folding on translocation of an autotransporter passenger domain. We reveal that rigid structural elements within disulfide-bonded segments are resistant to autotransporter-mediated secretion. We define the size limit of disulfide-bonded segments tolerated by the autotransporter system demonstrating that, when present, cysteine pairs are intrinsically closely spaced to prevent congestion of the translocator pore by large disulfide-bonded regions. These latter data strongly support the hairpin mode of autotransporter biogenesis.
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Affiliation(s)
- Denisse L Leyton
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | | | - Douglas F Browning
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Amanda E Rossiter
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Timothy J Wells
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Rebecca E Fitzpatrick
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Michael Overduin
- School of Cancer Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Adam F Cunningham
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom
| | - Ian R Henderson
- School of Immunity and Infection, University of Birmingham, Birmingham B15 2TT, United Kingdom.
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83
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Marshall JL, Zhang Y, Pallan L, Hsu MC, Khan M, Cunningham AF, MacLennan ICM, Toellner KM. Cover Picture: Eur. J. Immunol. 12/11. Eur J Immunol 2011. [DOI: 10.1002/eji.201190077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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84
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Buchan SL, Taraban VY, Slebioda TJ, James S, Cunningham AF, Al-Shamkhani A. Death receptor 3 is essential for generating optimal protective CD4+ T-cell immunity against Salmonella. Eur J Immunol 2011. [DOI: 10.1002/eji.201141950] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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85
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Marshall JL, Zhang Y, Pallan L, Hsu MC, Khan M, Cunningham AF, MacLennan ICM, Toellner KM. Early B blasts acquire a capacity for Ig class switch recombination that is lost as they become plasmablasts. Eur J Immunol 2011; 41:3506-12. [DOI: 10.1002/eji.201141762] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2011] [Revised: 07/22/2011] [Accepted: 09/15/2011] [Indexed: 11/12/2022]
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86
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Flores-Langarica A, Marshall JL, Bobat S, Mohr E, Hitchcock J, Ross EA, Coughlan RE, Khan M, Van Rooijen N, Henderson IR, MacLennan IC, Cunningham AF. Correction: T-zone localized monocyte-derived dendritic cells promote Th1 priming to Salmonella. Eur J Immunol 2011. [DOI: 10.1002/eji.201190062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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87
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Flores-Langarica A, Marshall JL, Bobat S, Mohr E, Hitchcock J, Ross EA, Coughlan RE, Khan M, Van Rooijen N, Henderson IR, Maclennan ICM, Cunningham AF. T-zone localized monocyte-derived dendritic cells promote Th1 priming to Salmonella. Eur J Immunol 2011; 41:2654-65. [PMID: 21630252 DOI: 10.1002/eji.201141440] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2011] [Revised: 05/04/2011] [Accepted: 05/25/2011] [Indexed: 12/24/2022]
Abstract
Control of intracellular Salmonella infection requires Th1 priming and IFN-γ production. Here, we show that efficient Th1 priming after Salmonella infection requires CD11c(+) CD11b(hi) F4/80(+) monocyte-derived dendritic cells (moDCs). In non-infected spleens, moDCs are absent from T-cell zones (T zones) of secondary lymphoid tissues, but by 24 h post-infection moDCs are readily discernible in these sites. The accumulation of moDCs is more dependent upon bacterial viability than bacterial virulence. Kinetic studies showed that moDCs were necessary to prime but not sustain Th1 responses, while ex vivo studies showed that antigen-experienced moDCs were sufficient to induce T-cell proliferation and IFN-γ production via a TNF-α-dependent mechanism. Importantly, moDCs and cDCs when co-cultured induced superior Th1 differentiation than either subset alone, and this activity was independent of TNF-α. Thus, optimal Th1 development to Salmonella requires the rapid accumulation of moDCs within T zones and their collaboration with cDCs.
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Affiliation(s)
- Adriana Flores-Langarica
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection, Institute of Biomedical Research, University of Birmingham, Birmingham, UK
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88
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Ross EA, Coughlan RE, Flores-Langarica A, Bobat S, Marshall JL, Hussain K, Charlesworth J, Abhyankar N, Hitchcock J, Gil C, López-Macías C, Henderson IR, Khan M, Watson SP, MacLennan ICM, Buckley CD, Cunningham AF. CD31 is required on CD4+ T cells to promote T cell survival during Salmonella infection. J Immunol 2011; 187:1553-65. [PMID: 21734076 DOI: 10.4049/jimmunol.1000502] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Hematopoietic cells constitutively express CD31/PECAM1, a signaling adhesion receptor associated with controlling responses to inflammatory stimuli. Although expressed on CD4(+) T cells, its function on these cells is unclear. To address this, we have used a model of systemic Salmonella infection that induces high levels of T cell activation and depends on CD4(+) T cells for resolution. Infection of CD31-deficient (CD31KO) mice demonstrates that these mice fail to control infection effectively. During infection, CD31KO mice have diminished numbers of total CD4(+) T cells and IFN-γ-secreting Th1 cells. This is despite a higher proportion of CD31KO CD4(+) T cells exhibiting an activated phenotype and an undiminished capacity to prime normally and polarize to Th1. Reduced numbers of T cells reflected the increased propensity of naive and activated CD31KO T cells to undergo apoptosis postinfection compared with wild-type T cells. Using adoptive transfer experiments, we show that loss of CD31 on CD4(+) T cells alone is sufficient to account for the defective CD31KO T cell accumulation. These data are consistent with CD31 helping to control T cell activation, because in its absence, T cells have a greater propensity to become activated, resulting in increased susceptibility to become apoptotic. The impact of CD31 loss on T cell homeostasis becomes most pronounced during severe, inflammatory, and immunological stresses such as those caused by systemic Salmonella infection. This identifies a novel role for CD31 in regulating CD4 T cell homeostasis.
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Affiliation(s)
- Ewan A Ross
- Medical Research Council Centre for Immune Regulation, School of Immunity and Infection, Institute for Biomedical Research, University of Birmingham, Birmingham B15 2TT, United Kingdom
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89
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Lee SK, Rigby RJ, Zotos D, Tsai LM, Kawamoto S, Marshall JL, Ramiscal RR, Chan TD, Gatto D, Brink R, Yu D, Fagarasan S, Tarlinton DM, Cunningham AF, Vinuesa CG. B cell priming for extrafollicular antibody responses requires Bcl-6 expression by T cells. ACTA ACUST UNITED AC 2011; 208:1377-88. [PMID: 21708925 PMCID: PMC3135363 DOI: 10.1084/jem.20102065] [Citation(s) in RCA: 217] [Impact Index Per Article: 16.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
T follicular helper cells (Tfh cells) localize to follicles where they provide growth and selection signals to mutated germinal center (GC) B cells, thus promoting their differentiation into high affinity long-lived plasma cells and memory B cells. T-dependent B cell differentiation also occurs extrafollicularly, giving rise to unmutated plasma cells that are important for early protection against microbial infections. Bcl-6 expression in T cells has been shown to be essential for the formation of Tfh cells and GC B cells, but little is known about its requirement in physiological extrafollicular antibody responses. We use several mouse models in which extrafollicular plasma cells can be unequivocally distinguished from those of GC origin, combined with antigen-specific T and B cells, to show that the absence of T cell-expressed Bcl-6 significantly reduces T-dependent extrafollicular antibody responses. Bcl-6(+) T cells appear at the T-B border soon after T cell priming and before GC formation, and these cells express low amounts of PD-1. Their appearance precedes that of Bcl-6(+) PD-1(hi) T cells, which are found within the GC. IL-21 acts early to promote both follicular and extrafollicular antibody responses. In conclusion, Bcl-6(+) T cells are necessary at B cell priming to form extrafollicular antibody responses, and these pre-GC Tfh cells can be distinguished phenotypically from GC Tfh cells.
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Affiliation(s)
- Sau K Lee
- Department of Pathogens and Immunity, John Curtin School of Medical Research, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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90
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Serre K, Bénézech C, Desanti G, Bobat S, Toellner KM, Bird R, Chan S, Kastner P, Cunningham AF, MacLennan ICM, Mohr E. Helios is associated with CD4 T cells differentiating to T helper 2 and follicular helper T cells in vivo independently of Foxp3 expression. PLoS One 2011; 6:e20731. [PMID: 21677778 PMCID: PMC3108993 DOI: 10.1371/journal.pone.0020731] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2010] [Accepted: 05/10/2011] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Although in vitro IL-4 directs CD4 T cells to produce T helper 2 (Th2)-cytokines, these cytokines can be induced in vivo in the absence of IL-4-signalling. Thus, mechanism(s), different from the in vitro pathway for Th2-induction, contribute to in vivo Th2-differentiation. The pathway for in vivo IL-4-independent Th2-differentiation has yet to be characterized. FINDINGS Helios (ikzf2), a member of the Ikaros transcription regulator family, is expressed in thymocytes and some antigen-matured T cells as well as in regulatory T cells. It has been proposed that Helios is a specific marker for thymus-derived regulatory T cells. Here, we show that mouse ovalbumin-specific CD4 (OTII) cells responding to alum-precipitated ovalbumin (alumOVA) upregulate Th2 features - GATA-3 and IL-4 - as well as Helios mRNA and protein. Helios is also upregulated in follicular helper T (TFh) cells in this response. By contrast, OTII cells responding to the Th1 antigen - live attenuated ovalbumin-expressing Salmonella - upregulate Th1 features - T-bet and IFN-γ - but not Helios. In addition, CD4 T cells induced to produce Th2 cytokines in vitro do not express Helios. The kinetics of Helios mRNA and protein induction mirrors that of GATA-3. The induction of IL-4, IL-13 and CXCR5 by alumOVA requires NF-κB1 and this is also needed for Helios upregulation. Importantly, Helios is induced in Th2 and TFh cells without parallel upregulation of Foxp3. These findings suggested a key role for Helios in Th2 and TFh development in response to alum-protein vaccines. We tested this possibility using Helios-deficient OTII cells and found this deficiency had no discernable impact on Th2 and TFh differentiation in response to alumOVA. CONCLUSIONS Helios is selectively upregulated in CD4 T cells during Th2 and TFh responses to alum-protein vaccines in vivo, but the functional significance of this upregulation remains uncertain.
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Affiliation(s)
- Karine Serre
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
- * E-mail: (KS); (ICMM); (EM)
| | - Cécile Bénézech
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Guillaume Desanti
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Saeeda Bobat
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Kai-Michael Toellner
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Roger Bird
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Susan Chan
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM Unité 964, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7104, Université de Strasbourg, Strasbourg, France
| | - Philippe Kastner
- Institut de Génétique et de Biologie Moléculaire et Cellulaire, INSERM Unité 964, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 7104, Université de Strasbourg, Strasbourg, France
| | - Adam F. Cunningham
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
| | - Ian C. M. MacLennan
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
- * E-mail: (KS); (ICMM); (EM)
| | - Elodie Mohr
- School of Immunity and Infection, MRC Centre for Immune Regulation, Institute for Biomedical Research, University of Birmingham, Birmingham, England, United Kingdom
- * E-mail: (KS); (ICMM); (EM)
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91
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Pastelin-Palacios R, Gil-Cruz C, Pérez-Shibayama CI, Moreno-Eutimio MA, Cervantes-Barragán L, Arriaga-Pizano L, Ludewig B, Cunningham AF, García-Zepeda EA, Becker I, Alpuche-Aranda C, Bonifaz L, Gunn JS, Isibasi A, López-Macías C. Subversion of innate and adaptive immune activation induced by structurally modified lipopolysaccharide from Salmonella typhimurium. Immunology 2011; 133:469-81. [PMID: 21631497 DOI: 10.1111/j.1365-2567.2011.03459.x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Salmonella are successful pathogens that infect millions of people every year. During infection, Salmonella typhimurium changes the structure of its lipopolysaccharide (LPS) in response to the host environment, rendering bacteria resistant to cationic peptide lysis in vitro. However, the role of these structural changes in LPS as in vivo virulence factors and their effects on immune responses and the generation of immunity are largely unknown. We report that modified LPS are less efficient than wild-type LPS at inducing pro-inflammatory responses. The impact of this LPS-mediated subversion of innate immune responses was demonstrated by increased mortality in mice infected with a non-lethal dose of an attenuated S. typhimurium strain mixed with the modified LPS moieties. Up-regulation of co-stimulatory molecules on antigen-presenting cells and CD4(+) T-cell activation were affected by these modified LPS. Strains of S. typhimurium carrying structurally modified LPS are markedly less efficient at inducing specific antibody responses. Immunization with modified LPS moiety preparations combined with experimental antigens, induced an impaired Toll-like receptor 4-mediated adjuvant effect. Strains of S. typhimurium carrying structurally modified LPS are markedly less efficient at inducing immunity against challenge with virulent S. typhimurium. Hence, changes in S. typhimurium LPS structure impact not only on innate immune responses but also on both humoral and cellular adaptive immune responses.
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Affiliation(s)
- Rodolfo Pastelin-Palacios
- Medical Research Unit on Immunochemistry, Specialties Hospital, National Medical Centre 'Siglo XXI', Mexican Social Security Institute, Mexico City
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92
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Serre K, Mohr E, Bénézech C, Bird R, Khan M, Caamaño JH, Cunningham AF, Maclennan ICM. Selective effects of NF-κB1 deficiency in CD4⁺ T cells on Th2 and TFh induction by alum-precipitated protein vaccines. Eur J Immunol 2011; 41:1573-82. [PMID: 21469117 DOI: 10.1002/eji.201041126] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2010] [Revised: 02/11/2011] [Accepted: 03/24/2011] [Indexed: 01/14/2023]
Abstract
NF-κB1-dependent signaling directs the development of CD4(+) Th2 cells during allergic airway inflammation and protective responses to helminth infection. Here, we show that IL-4 and IL-13 production is NF-κB1-dependent in mouse OVA-specific CD4(+) (OTII) T cells responding to alum-precipitated OVA (alumOVA) immunization. More surprisingly, we found that NF-κB1 deficiency in OTII cells also selectively impairs their CXCR5 induction by alumOVA without affecting upregulation of BCL6, IL-21, OX40 and CXCR4 mRNA and PD-1 protein. This results in functional impairment of follicular helper T cells. Thus, fewer germinal center B cells develop in LN responses to alumOVA in T-cell-deficient mice reconstituted with NF-κB1(-/-) OTII cells as opposed to NF-κB1(+/+) OTII cells, while plasma cell numbers are comparable. Unlike CXCR5 induction in CD4(+) T cells, NF-κB1-deficient recirculating follicular B cells are shown to express normal levels of CXCR5. The selective effects of NF-κB1-deficiency on Th2 and follicular helper T cell induction do not appear to be due to altered expression of the Th2-associated transcription factors - GATA-3, c-Maf and Ikaros. Altogether, these results suggest that NF-κB1 regulates the expression of CXCR5 on CD4(+) T cells primed in vivo, and thus selectively controls the T-cell-dependent germinal center component of B-cell response to alumOVA.
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Affiliation(s)
- Karine Serre
- MRC Centre for Immune Regulation, IBR, School of Immunity and Infection, University of Birmingham, Birmingham, UK.
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93
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Rossiter AE, Browning DF, Leyton DL, Johnson MD, Godfrey RE, Wardius CA, Desvaux M, Cunningham AF, Ruiz-Perez F, Nataro JP, Busby SJW, Henderson IR. Transcription of the plasmid-encoded toxin gene from enteroaggregative Escherichia coli is regulated by a novel co-activation mechanism involving CRP and Fis. Mol Microbiol 2011; 81:179-91. [PMID: 21542864 DOI: 10.1111/j.1365-2958.2011.07685.x] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
Enteroaggregative Escherichia coli (EAEC) is a major cause of diarrhoea in developing countries. EAEC 042 is the prototypical strain. EAEC 042 secretes the functionally well-characterized Pet autotransporter toxin that contributes to virulence through its cytotoxic effects on intestinal epithelial cells. Following a global transposon mutagenesis screen of EAEC 042, the transcription factors, CRP and Fis, were identified as essential for transcription of the pet gene. Using both in vivo and in vitro techniques, we show that the pet promoter is co-dependent on CRP and Fis. We present a novel co-activation mechanism whereby CRP is placed at a non-optimal position for transcription initiation, creating dependence on Fis for full activation of pet. This study complements previous findings that establish Fis as a key virulence regulator in EAEC 042.
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Affiliation(s)
- Amanda E Rossiter
- School of Immunity and Infection School of Biosciences, University of Birmingham, Birmingham B15 2TT, UK
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94
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Bobat S, Flores-Langarica A, Hitchcock J, Marshall JL, Kingsley RA, Goodall M, Gil-Cruz C, Serre K, Leyton DL, Letran SE, Gaspal F, Chester R, Chamberlain JL, Dougan G, López-Macías C, Henderson IR, Alexander J, MacLennan ICM, Cunningham AF. Soluble flagellin, FliC, induces an Ag-specific Th2 response, yet promotes T-bet-regulated Th1 clearance of Salmonella typhimurium infection. Eur J Immunol 2011; 41:1606-18. [PMID: 21469112 DOI: 10.1002/eji.201041089] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2010] [Revised: 01/28/2011] [Accepted: 03/17/2011] [Indexed: 11/06/2022]
Abstract
Clearance of disseminated Salmonella infection requires bacterial-specific Th1 cells and IFN-γ production, and Th1-promoting vaccines are likely to help control these infections. Consequently, vaccine design has focused on developing Th1-polarizing adjuvants or Ag that naturally induce Th1 responses. In this study, we show that, in mice, immunization with soluble, recombinant FliC protein flagellin (sFliC) induces Th2 responses as evidenced by Ag-specific GATA-3, IL-4 mRNA, and protein induction in CD62L(lo) CD4(+) T cells without associated IFN-γ production. Despite these Th2 features, sFliC immunization can enhance the development of protective Th1 immunity during subsequent Salmonella infection in an Ab-independent, T-cell-dependent manner. Salmonella infection in sFliC-immunized mice resulted in augmented Th1 responses, with greater bacterial clearance and increased numbers of IFN-γ-producing CD4(+) T cells, despite the early induction of Th2 features to sFliC. The augmented Th1 immunity after sFliC immunization was regulated by T-bet although T-bet is dispensable for primary responses to sFliC. These findings show that there can be flexibility in T-cell responses to some subunit vaccines. These vaccines may induce Th2-type immunity during primary immunization yet promote Th1-dependent responses during later infection. This suggests that designing Th1-inducing subunit vaccines may not always be necessary since this can occur naturally during subsequent infection.
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Affiliation(s)
- Saeeda Bobat
- MRC Centre for Immune Regulation, University of Birmingham, Birmingham, UK
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95
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Letran SE, Lee SJ, Atif SM, Flores-Langarica A, Uematsu S, Akira S, Cunningham AF, McSorley SJ. TLR5-deficient mice lack basal inflammatory and metabolic defects but exhibit impaired CD4 T cell responses to a flagellated pathogen. J Immunol 2011; 186:5406-12. [PMID: 21451112 DOI: 10.4049/jimmunol.1003576] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
TLR5-deficient mice have been reported to develop spontaneous intestinal inflammation and metabolic abnormalities. However, we report that TLR5-deficient mice from two different animal colonies display no evidence of basal inflammatory disease, metabolic abnormalities, or enhanced resistance to Salmonella infection. In contrast, the absence of TLR5 hindered the initial activation and clonal expansion of intestinal flagellin-specific CD4 T cells following oral Salmonella infection. Together, these data demonstrate that a basal inflammatory phenotype is not a consistent feature of TLR5-deficient mice and document a novel role for TLR5 in the rapid targeting of flagellin by intestinal pathogen-specific CD4 T cells.
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Affiliation(s)
- Shirdi E Letran
- Center for Infectious Diseases and Microbiology Translational Research, McGuire Translational Research Facility, University of Minnesota Medical School, Minneapolis, MN 55455, USA
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96
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Siggins MK, Cunningham AF, Marshall JL, Chamberlain JL, Henderson IR, MacLennan CA. Absent bactericidal activity of mouse serum against invasive African nontyphoidal Salmonella results from impaired complement function but not a lack of antibody. J Immunol 2011; 186:2365-71. [PMID: 21217014 DOI: 10.4049/jimmunol.1000284] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Nontyphoidal strains of Salmonella are a major cause of fatal bacteremia in Africa. Developing a vaccine requires an improved understanding of the relevant mechanisms of protective immunity, and the mouse model of Salmonella infection is useful for studying immunity to Salmonella in vivo. It is important to appreciate the similarities and differences between immunity to Salmonella in mice and men. Ab is important for protection against nontyphoidal Salmonella in both species, and we have previously found an important role for Ab in cell-free complement-mediated bactericidal activity against Salmonella in Africans. It is unclear whether this modality of immunity is relevant in the mouse model. C57BL/6, BALB/c, and C3H mice immunized with heat-killed Salmonella Typhimurium strains D23580 (African invasive strain) and SL1344 and live-attenuated strain SL3261 produced a Salmonella-specific Ab response. Sera from these mice deposited reduced levels of C3 on Salmonella compared with human sera and were unable to kill both wild-type and galE(-) rough mutant of D23580, indicating absent cell-free killing via classical and alternative complement pathways. Supplementing immune mouse sera with human complement enabled killing of Salmonella, whereas addition of human anti-Salmonella Ab to immune mouse sera had no effect. These findings indicate that mouse serum cannot effect [corrected] cell-free complement-dependent killing of Salmonella, because of the reduced mouse complement ability to kill these bacteria compared with human complement. This difference in Ab-dependent immunity to Salmonella in mice and men must be considered when applying findings from the mouse model of Salmonella disease and vaccination response to man.
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Affiliation(s)
- Matthew K Siggins
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, College of Medicine and Dental Sciences, University of Birmingham, Birmingham B15 2TT, United Kingdom
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97
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Bermejo DA, Amezcua Vesely MC, Khan M, Acosta Rodríguez EV, Montes CL, Merino MC, Toellner KM, Mohr E, Taylor D, Cunningham AF, Gruppi A. Trypanosoma cruzi infection induces a massive extrafollicular and follicular splenic B-cell response which is a high source of non-parasite-specific antibodies. Immunology 2010; 132:123-33. [PMID: 20875075 DOI: 10.1111/j.1365-2567.2010.03347.x] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Acute infection with Trypanosoma cruzi, the aetiological agent of Chagas' disease, results in parasitaemia and polyclonal lymphocyte activation. It has been reported that polyclonal B-cell activation is associated with hypergammaglobulinaemia and delayed parasite-specific antibody response. In the present study we analysed the development of a B-cell response within the different microenvironments of the spleen during acute T. cruzi infection. We observed massive germinal centre (GC) and extrafollicular (EF) responses at the peak of infection. However, the EF foci were evident since day 3 post-infection (p.i.), and, early in the infection, they mainly provided IgM. The EF foci response reached its peak at 11 days p.i. and extended from the red pulp into the periarteriolar lymphatic sheath. The GCs were detected from day 8 p.i. At the peak of parasitaemia, CD138(+) B220(+) plasma cells in EF foci, red pulp and T-cell zone expressed IgM and all the IgG isotypes. Instead of the substantial B-cell response, most of the antibodies produced by splenic cells did not target the parasite, and parasite-specific IgG isotypes could be detected in sera only after 18 days p.i. We also observed that the bone marrow of infected mice presented a strong reduction in CD138(+) B220(+) cells compared with that of normal mice. Hence, in acute infection with T. cruzi, the spleen appears to be the most important lymphoid organ that lodges plasma cells and the main producer of antibodies. The development of a B-cell response during T. cruzi infection shows features that are particular to T. cruzi and other protozoan infection but different to other infections or immunization with model antigens.
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Affiliation(s)
- Daniela A Bermejo
- Immunology, School of Chemical Sciences, National University of Córdoba, Córdoba, Argentina
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98
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White AL, Tutt AL, James S, Wilkinson KA, Castro FVV, Dixon SV, Hitchcock J, Khan M, Al-Shamkhani A, Cunningham AF, Glennie MJ. Ligation of CD11c during vaccination promotes germinal centre induction and robust humoral responses without adjuvant. Immunology 2010; 131:141-51. [PMID: 20465572 DOI: 10.1111/j.1365-2567.2010.03285.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
In this study, we investigated the mouse dendritic cell (DC) receptor, complement receptor 4 (CR4; CD11c/CD18), as an immunotarget for triggering humoral immunity. Comparison of antibody titres generated against a panel of 13 anti-antigen-presenting cell receptor monoclonal antibodies, with or without conjugated ovalbumin (OVA), revealed uniquely rapid and robust responses following CR4 targeting, with antibody titres approaching 1 : 100 000 7 days after a single dose of antigen. Furthermore, using just 100 ng OVA conjugated to anti-CD11c Fab', we generated anti-OVA titres greater than those produced by a 100-fold higher dose of OVA in complete Freund's adjuvant at day 28. These anti-OVA antibody titres were sustained and could be boosted further with targeted OVA on day 21. Investigations to explain this vaccine potency showed that, in addition to targeting splenic DC, anti-CDl1c antibodies delivered a powerful adjuvant effect and could boost humoral immunity against OVA even when the OVA was targeted to other molecules on DC, such as major histocompatibility complex class II, CD11a and CD11b. However, interestingly, this adjuvant effect was lost if OVA was targeted to other cells such as B cells via CD21 or CD19. The adjuvant effect was mediated through a marked enhancement of both germinal centre and extrafollicular plasma cell formation in responding spleens. These results demonstrate that anti-CD11c monoclonal antibody can both target antigen and act as a powerful adjuvant for rapid and sustained antibody responses. They also point to an interesting role for CR4 on DC in triggering B cells during humoral immunity.
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Affiliation(s)
- Ann L White
- Tenovus Research Laboratory, Cancer Sciences Division, Southampton University School of Medicine, General Hospital, Southampton, UK
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99
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MacLennan CA, Gilchrist JJ, Gordon MA, Cunningham AF, Cobbold M, Goodall M, Kingsley RA, van Oosterhout JJG, Msefula CL, Mandala WL, Leyton DL, Marshall JL, Gondwe EN, Bobat S, López-Macías C, Doffinger R, Henderson IR, Zijlstra EE, Dougan G, Drayson MT, MacLennan ICM, Molyneux ME. Dysregulated humoral immunity to nontyphoidal Salmonella in HIV-infected African adults. Science 2010; 328:508-12. [PMID: 20413503 DOI: 10.1126/science.1180346] [Citation(s) in RCA: 129] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Nontyphoidal Salmonellae are a major cause of life-threatening bacteremia among HIV-infected individuals. Although cell-mediated immunity controls intracellular infection, antibodies protect against Salmonella bacteremia. We report that high-titer antibodies specific for Salmonella lipopolysaccharide (LPS) are associated with a lack of Salmonella-killing in HIV-infected African adults. Killing was restored by genetically shortening LPS from the target Salmonella or removing LPS-specific antibodies from serum. Complement-mediated killing of Salmonella by healthy serum is shown to be induced specifically by antibodies against outer membrane proteins. This killing is lost when excess antibody against Salmonella LPS is added. Thus, our study indicates that impaired immunity against nontyphoidal Salmonella bacteremia in HIV infection results from excess inhibitory antibodies against Salmonella LPS, whereas serum killing of Salmonella is induced by antibodies against outer membrane proteins.
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Affiliation(s)
- Calman A MacLennan
- Medical Research Council Centre for Immune Regulation and Clinical Immunology Service, Institute of Biomedical Research, School of Immunity and Infection, University of Birmingham, Birmingham, UK.
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100
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Serre K, Mohr E, Toellner K, Cunningham AF, Bird R, Khan M, MacLennan ICM. Early simultaneous production of intranodal CD4 Th2 effectors and recirculating rapidly responding central‐memory‐like CD4 T cells. Eur J Immunol 2009; 39:1573-86. [DOI: 10.1002/eji.200838922] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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