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Dulfer EA, Geckin B, Taks EJ, GeurtsvanKessel CH, Dijkstra H, van Emst L, van der Gaast – de Jongh CE, van Mourik D, Koopmans PC, Domínguez-Andrés J, van Crevel R, van de Maat JS, de Jonge MI, Netea MG. Timing and sequence of vaccination against COVID-19 and influenza (TACTIC): a single-blind, placebo-controlled randomized clinical trial. THE LANCET REGIONAL HEALTH. EUROPE 2023; 29:100628. [PMID: 37261212 PMCID: PMC10091277 DOI: 10.1016/j.lanepe.2023.100628] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 03/17/2023] [Accepted: 03/17/2023] [Indexed: 06/02/2023]
Abstract
Background Novel mRNA-based vaccines have been used to protect against SARS-CoV-2, especially in vulnerable populations who also receive an annual influenza vaccination. The TACTIC study investigated potential immune interference between the mRNA COVID-19 booster vaccine and the quadrivalent influenza vaccine, and determined if concurrent administration would have effects on safety or immunogenicity. Methods TACTIC was a single-blind, placebo-controlled randomized clinical trial conducted at the Radboud University Medical Centre, the Netherlands. Individuals ≥60 years, fully vaccinated against COVID-19 were eligible for participation and randomized into one of four study groups: 1) 0.5 ml influenza vaccination Vaxigrip Tetra followed by 0.3 ml BNT162b2 COVID-19 booster vaccination 21 days later, (2) COVID-19 booster vaccination followed by influenza vaccination, (3) influenza vaccination concurrent with the COVID-19 booster vaccination, and (4) COVID-19 booster vaccination only (reference group). Primary outcome was the geometric mean concentration (GMC) of IgG against the spike (S)-protein of the SARS-CoV-2 virus, 21 days after booster vaccination. We performed a non-inferiority analysis of concurrent administration compared to booster vaccines alone with a predefined non-inferiority margin of -0.3 on the log10-scale. Findings 154 individuals participated from October, 4, 2021, until November, 5, 2021. Anti-S IgG GMCs for the co-administration and reference group were 1684 BAU/ml and 2435 BAU/ml, respectively. Concurrent vaccination did not meet the criteria for non-inferiority (estimate -0.1791, 95% CI -0.3680 to -0.009831) and antibodies showed significantly lower neutralization capacity compared to the reference group. Reported side-effects were mild and did not differ between study groups. Interpretation Concurrent administration of both vaccines is safe, but the quantitative and functional antibody responses were marginally lower compared to booster vaccination alone. Lower protection against COVID-19 with concurrent administration of COVID-19 and influenza vaccination cannot be excluded, although additional larger studies would be required to confirm this. Trial registration number EudraCT: 2021-002186-17. Funding The study was supported by the ZonMw COVID-19 Programme.
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Affiliation(s)
- Elisabeth A. Dulfer
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Büsra Geckin
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Esther J.M. Taks
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | | | - Helga Dijkstra
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Liesbeth van Emst
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Christa E. van der Gaast – de Jongh
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
- Laboratory of Medical Immunology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Djenolan van Mourik
- Laboratory of Viroscience, Erasmus Medical Center, Rotterdam, the Netherlands
| | - Petra C. Koopmans
- Department of Biostatistics, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Jorge Domínguez-Andrés
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Reinout van Crevel
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Josephine S. van de Maat
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Marien I. de Jonge
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
- Laboratory of Medical Immunology, Radboud University Medical Center, Nijmegen, the Netherlands
| | - Mihai G. Netea
- Department of Internal Medicine, Radboud University Medical Center, Nijmegen, the Netherlands
- Radboud Center for Infectious Diseases, Radboud University Medical Center, Nijmegen, the Netherlands
- Department for Immunology and Metabolism, Life and Medical Sciences Institute (LIMES), University of Bonn, Germany
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Jones RP, Ponomarenko A. Roles for Pathogen Interference in Influenza Vaccination, with Implications to Vaccine Effectiveness (VE) and Attribution of Influenza Deaths. Infect Dis Rep 2022; 14:710-758. [PMID: 36286197 PMCID: PMC9602062 DOI: 10.3390/idr14050076] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/07/2022] [Revised: 09/15/2022] [Accepted: 09/15/2022] [Indexed: 08/29/2023] Open
Abstract
Pathogen interference is the ability of one pathogen to alter the course and clinical outcomes of infection by another. With up to 3000 species of human pathogens the potential combinations are vast. These combinations operate within further immune complexity induced by infection with multiple persistent pathogens, and by the role which the human microbiome plays in maintaining health, immune function, and resistance to infection. All the above are further complicated by malnutrition in children and the elderly. Influenza vaccination offers a measure of protection for elderly individuals subsequently infected with influenza. However, all vaccines induce both specific and non-specific effects. The specific effects involve stimulation of humoral and cellular immunity, while the nonspecific effects are far more nuanced including changes in gene expression patterns and production of small RNAs which contribute to pathogen interference. Little is known about the outcomes of vaccinated elderly not subsequently infected with influenza but infected with multiple other non-influenza winter pathogens. In this review we propose that in certain years the specific antigen mix in the seasonal influenza vaccine inadvertently increases the risk of infection from other non-influenza pathogens. The possibility that vaccination could upset the pathogen balance, and that the timing of vaccination relative to the pathogen balance was critical to success, was proposed in 2010 but was seemingly ignored. Persons vaccinated early in the winter are more likely to experience higher pathogen interference. Implications to the estimation of vaccine effectiveness and influenza deaths are discussed.
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Affiliation(s)
- Rodney P Jones
- Healthcare Analysis and Forecasting, Wantage OX12 0NE, UK
| | - Andrey Ponomarenko
- Department of Biophysics, Informatics and Medical Instrumentation, Odessa National Medical University, Valikhovsky Lane 2, 65082 Odessa, Ukraine
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3
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Altmann DM, Boyton RJ. Vaccine efficacy and immune interference: co-administering COVID-19 and influenza vaccines. THE LANCET RESPIRATORY MEDICINE 2022; 10:125-126. [PMID: 34800365 PMCID: PMC8598211 DOI: 10.1016/s2213-2600(21)00438-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/20/2021] [Accepted: 09/24/2021] [Indexed: 11/29/2022]
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4
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Wang Z, Ran L, Chen C, Shi R, Dong Y, Li Y, Zhou X, Qi Y, Zhu P, Gao Y, Wu Y. Identification of HLA-A2-Restricted Mutant Epitopes from Neoantigens of Esophageal Squamous Cell Carcinoma. Vaccines (Basel) 2021; 9:vaccines9101118. [PMID: 34696226 PMCID: PMC8541546 DOI: 10.3390/vaccines9101118] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 09/27/2021] [Accepted: 09/28/2021] [Indexed: 12/24/2022] Open
Abstract
Esophageal squamous cell carcinoma (ESCC), one of the deadliest gastrointestinal cancers, has had limited effective therapeutic strategies up to now. Accumulating evidence suggests that effective immunotherapy in cancer patients has been associated with T cells responsive to mutant peptides derived from neoantigens. Here, we selected 35 human leukocyte antigen-A2 (HLA-A2)-restricted mutant (MUT) peptides stemmed from neoantigens of ESCC. Among them, seven mutant peptides had potent binding affinity to HLA-A*0201 molecules and could form a stable peptide/HLA-A*0201 complex. Three mutant peptides (TP53-R267P, NFE2L2-D13N, and PCLO-E4090Q) of those were immunogenic and could induce the cytotoxic T lymphocytes (CTLs) recognizing mutant peptides presented on transfected cells in an HLA-A2-restricted and MUT peptide-specific manner. In addition, the CTL response in immunized HLA-A2.1/Kb transgenic (Tg) mice was enhanced by coupling MUT peptides to peptide WH, a peptide delivery carrier targeting Clec9a+ DCs. Then, the possible binding model conversions between the WT and MUT candidate peptides were analyzed by docking with the pockets of HLA-A*0201 molecule. We therefore propose a novel strategy and epitopes for immunotherapy of ESCC based on neoantigens.
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Affiliation(s)
- Zhiwei Wang
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Ling Ran
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Chunxia Chen
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Ranran Shi
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Yu Dong
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Yubing Li
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Xiuman Zhou
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
| | - Yuanming Qi
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
- International Joint Laboratory for Protein and Peptide Drugs of Henan Province, Zhengzhou University, Zhengzhou 450001, China
| | - Pingping Zhu
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
- State Key Laboratory of Esophageal Cancer Prevention & Treatment, Zhengzhou University, Zhengzhou 450052, China
| | - Yanfeng Gao
- School of Pharmaceutical Sciences (Shenzhen), Sun Yat-sen University, Shenzhen 510080, China
- Correspondence: (Y.G.); (Y.W.); Tel./Fax: +86-371-6778-3235 (Y.W.)
| | - Yahong Wu
- School of Life Sciences, Zhengzhou University, Zhengzhou 450001, China; (Z.W.); (L.R.); (C.C.); (R.S.); (Y.D.); (Y.L.); (X.Z.); (Y.Q.); (P.Z.)
- International Joint Laboratory for Protein and Peptide Drugs of Henan Province, Zhengzhou University, Zhengzhou 450001, China
- Correspondence: (Y.G.); (Y.W.); Tel./Fax: +86-371-6778-3235 (Y.W.)
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Functional Recognition by CD8+ T Cells of Epitopes with Amino Acid Variations Outside Known MHC Anchor or T Cell Receptor Recognition Residues. Int J Mol Sci 2020; 21:ijms21134700. [PMID: 32630213 PMCID: PMC7369715 DOI: 10.3390/ijms21134700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2020] [Revised: 06/23/2020] [Accepted: 06/29/2020] [Indexed: 11/22/2022] Open
Abstract
Peptide-based vaccines can be safer and more cost effective than whole organism vaccines. Previous studies have shown that inorganic polystyrene nanoparticles (PSNPs) covalently conjugated to the minimal immunodominant peptide epitope from murine liver stage malaria (SYIPSAEKI) induced potent CD8+ T cell responses. Many pathogens, including malaria, have polymorphic T cell epitope regions. Amino acid changes in positions that are contact residues for the T cell receptor (TCR) often alter the specific cross-reactivity induced by the peptide antigen, and it is largely assumed that changes outside of these residues have little impact. Herein, each amino acid residue (except major histocompatibility complex (MHC) anchors) was systematically changed to an alanine. Peptide epitopes with altered amino acids outside T cell contact residues were still recognized by T cells induced by PSNPs-SYIPSAEKI (KI) vaccines, albeit at lower levels, except for the variant SYIPSAAKI (A7). PSNPs-SYIPSAAKI vaccines further elicited high responses to the index KI peptide. None of the epitopes displayed altered peptide ligand (APL) antagonism in vitro, and re-stimulating SYIPSAEKI and SYIPSAAKI together synergistically enhanced IFN-γ production by the T cells. These results show epitope variation in non-TCR recognition residues can have effects on T cell reactivity, suggesting that such natural variation may also be driven by immune pressure. Additionally, when re-modelling peptides to enhance the cross-reactivity of vaccines, both TCR recognition and non-recognition residues should be considered.
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6
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Kuamsab N, Putaporntip C, Jongwutiwes S. Polymorphism and natural selection in the merozoite surface protein 3F2 (PVX_97710) locus of Plasmodium vivax among field isolates. INFECTION GENETICS AND EVOLUTION 2019; 78:104058. [PMID: 31706081 DOI: 10.1016/j.meegid.2019.104058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 09/25/2019] [Accepted: 09/29/2019] [Indexed: 11/24/2022]
Abstract
Plasmodium vivax, the chronic relapsing human malaria parasite with the most widespread distribution, possesses proteins associated with the merozoite surface that could be targets for host immune responses and potential vaccine candidates. Of these, the merozoite surface protein 3 of P. vivax (PvMSP3) is an attractive vaccine target as well as a genetic marker for epidemiological surveillance. PvMSP3 comprises a group of protein members encoded by a multigene family. Although some protein members, i.e. PvMSP3α and PvMSP3β, have been targets for molecular and immunological investigations, the most abundantly expressed protein member during late asexual erythrocytic stages, PvMSP3F2 (PVX_97710), remains unexplored. To address domain organization and evolution of this locus, the complete coding sequences of 31 P. vivax isolates from diverse malaria endemic areas of Thailand were analyzed and compared with 10 previously reported sequences. Results revealed that all PvMSP3F2 sequences differed but could be divided into 5 repeat-containing domains flanked by 6 non-repeat domains. Repeat domains II and IV at the 5' portion and domain X at the 3' portion exhibited extensive sequence and length variation whereas repeat domains VI and VIII located at the central region were relatively conserved. Despite a repertoire of PvMSP3F2 variants, predicted coiled-coil tertiary structure and predicted B-cell epitopes seem to be maintained. Evidence of intragenic recombination has been detected among field isolates in Thailand that could enhance sequence diversity at this locus. Non-repeat domains I and IX located at the 5' end and at the 3' portion, respectively, seem to have evolved under purifying selection. Evidence of positive selection was found in non-repeat domains III, V and VII where a number of predicted HLA class I epitopes were identified. Amino acid substitutions in these predicted epitopes could alter predicted peptide binding affinity or abolish peptide epitope property, suggesting that polymorphism in these epitopes conferred host immune evasion. Further studies on PvMSP3F2 are warranted, particularly on interaction with host immune system and the potential role of this PvMSP3 protein member as a vaccine target.
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Affiliation(s)
- Napaporn Kuamsab
- Molecular Biology of Malaria and Opportunistic Parasites Research Unit, Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand; Inter-Department Program of Biomedical Sciences, Faculty of Graduate School, Chulalongkorn University, Bangkok, Thailand
| | - Chaturong Putaporntip
- Molecular Biology of Malaria and Opportunistic Parasites Research Unit, Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand.
| | - Somchai Jongwutiwes
- Molecular Biology of Malaria and Opportunistic Parasites Research Unit, Department of Parasitology, Faculty of Medicine, Chulalongkorn University, Bangkok, Thailand
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7
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Heide J, Vaughan KC, Sette A, Jacobs T, Schulze Zur Wiesch J. Comprehensive Review of Human Plasmodium falciparum-Specific CD8+ T Cell Epitopes. Front Immunol 2019; 10:397. [PMID: 30949162 PMCID: PMC6438266 DOI: 10.3389/fimmu.2019.00397] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2018] [Accepted: 02/15/2019] [Indexed: 12/16/2022] Open
Abstract
Control of malaria is an important global health issue and there is still an urgent need for the development of an effective prophylactic vaccine. Multiple studies have provided strong evidence that Plasmodium falciparum-specific MHC class I-restricted CD8+ T cells are important for sterile protection against Plasmodium falciparum infection. Here, we present an interactive epitope map of all P. falciparum-specific CD8+ T cell epitopes published to date, based on a comprehensive data base (IEDB), and literature search. The majority of the described P. falciparum-specific CD8+ T cells were directed against the antigens CSP, TRAP, AMA1, and LSA1. Notably, most of the epitopes were discovered in vaccine trials conducted with malaria-naïve volunteers. Only few immunological studies of P. falciparum-specific CD8+ T cell epitopes detected in patients suffering from acute malaria or in people living in malaria endemic areas have been published. Further detailed immunological mappings of P. falciparum-specific epitopes of a broader range of P. falciparum proteins in different settings and with different disease status are needed to gain a more comprehensive understanding of the role of CD8+ T cell responses for protection, and to better guide vaccine design and to study their efficacy.
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Affiliation(s)
- Janna Heide
- Infectious Diseases Unit, I. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,German Center for Infection Research (DZIF), Partner Site Hamburg-Lübeck-Borstel-Riems, Hamburg, Germany
| | - Kerrie C Vaughan
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States
| | - Alessandro Sette
- Division of Vaccine Discovery, La Jolla Institute for Immunology, La Jolla, CA, United States.,Department of Medicine, Division of Infectious Diseases, University of California, San Diego (UCSD), La Jolla, CA, United States
| | - Thomas Jacobs
- Protozoa Immunology, Bernhard-Nocht-Institute of Tropical Medicine, Hamburg, Germany
| | - Julian Schulze Zur Wiesch
- Infectious Diseases Unit, I. Department of Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany.,German Center for Infection Research (DZIF), Partner Site Hamburg-Lübeck-Borstel-Riems, Hamburg, Germany
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8
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Early AM, Lievens M, MacInnis BL, Ockenhouse CF, Volkman SK, Adjei S, Agbenyega T, Ansong D, Gondi S, Greenwood B, Hamel M, Odero C, Otieno K, Otieno W, Owusu-Agyei S, Asante KP, Sorgho H, Tina L, Tinto H, Valea I, Wirth DF, Neafsey DE. Host-mediated selection impacts the diversity of Plasmodium falciparum antigens within infections. Nat Commun 2018; 9:1381. [PMID: 29643376 PMCID: PMC5895824 DOI: 10.1038/s41467-018-03807-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2017] [Accepted: 03/14/2018] [Indexed: 12/28/2022] Open
Abstract
Host immunity exerts strong selective pressure on pathogens. Population-level genetic analysis can identify signatures of this selection, but these signatures reflect the net selective effect of all hosts and vectors in a population. In contrast, analysis of pathogen diversity within hosts provides information on individual, host-specific selection pressures. Here, we combine these complementary approaches in an analysis of the malaria parasite Plasmodium falciparum using haplotype sequences from thousands of natural infections in sub-Saharan Africa. We find that parasite genotypes show preferential clustering within multi-strain infections in young children, and identify individual amino acid positions that may contribute to strain-specific immunity. Our results demonstrate that natural host defenses to P. falciparum act in an allele-specific manner to block specific parasite haplotypes from establishing blood-stage infections. This selection partially explains the extreme amino acid diversity of many parasite antigens and suggests that vaccines targeting such proteins should account for allele-specific immunity. Host immune responses exert selective pressure on Plasmodium falciparum. Here, the authors show that allele-specific immunity impacts the antigenic diversity of individual malaria infections. This process partially explains the extreme amino acid diversity of many parasite antigens and suggests that vaccines should account for allele-specific immunity.
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Affiliation(s)
- Angela M Early
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA. .,Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA.
| | | | - Bronwyn L MacInnis
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA.,Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA
| | | | - Sarah K Volkman
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA.,Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA.,Simmons College, School of Nursing and Health Sciences, Boston, MA, 02115, USA
| | - Samuel Adjei
- School of Medical Sciences, Kwame Nkrumah University of Science and Technology, KNUST - Kumasi, Ghana
| | - Tsiri Agbenyega
- School of Medical Sciences, Kwame Nkrumah University of Science and Technology, KNUST - Kumasi, Ghana
| | - Daniel Ansong
- School of Medical Sciences, Kwame Nkrumah University of Science and Technology, KNUST - Kumasi, Ghana
| | - Stacey Gondi
- KEMRI-Walter Reed Project, Kombewa, 40102, Kenya
| | - Brian Greenwood
- London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK
| | - Mary Hamel
- KEMRI/CDC Research and Public Health Collaboration, Kisumu, 40100, Kenya
| | - Chris Odero
- KEMRI/CDC Research and Public Health Collaboration, Kisumu, 40100, Kenya
| | - Kephas Otieno
- KEMRI/CDC Research and Public Health Collaboration, Kisumu, 40100, Kenya
| | | | - Seth Owusu-Agyei
- London School of Hygiene and Tropical Medicine, London, WC1E 7HT, UK.,Kintampo Health Research Centre, Kintampo, 200, Ghana.,University of Health and Allied Science, PMB 31, Ho, Volta Region, Ghana
| | | | - Hermann Sorgho
- Institut de Recherche en Sciences de la Santé, Nanoro, Burkina Faso/Institute of Tropical Medicine, 2000, Antwerp, Belgium
| | - Lucas Tina
- KEMRI-Walter Reed Project, Kombewa, 40102, Kenya
| | - Halidou Tinto
- Institut de Recherche en Sciences de la Santé, Nanoro, Burkina Faso/Institute of Tropical Medicine, 2000, Antwerp, Belgium
| | - Innocent Valea
- Institut de Recherche en Sciences de la Santé, Nanoro, Burkina Faso/Institute of Tropical Medicine, 2000, Antwerp, Belgium
| | - Dyann F Wirth
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA.,Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA
| | - Daniel E Neafsey
- Infectious Disease and Microbiome Program, Broad Institute of MIT and Harvard, Cambridge, MA, 02142, USA. .,Harvard T.H. Chan School of Public Health, Boston, MA, 02115, USA.
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9
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Minigo G, Flanagan KL, Slattery RM, Plebanski M. Vaccination with Altered Peptide Ligands of a Plasmodium berghei Circumsporozoite Protein CD8 T-Cell Epitope: A Model to Generate T Cells Resistant to Immune Interference by Polymorphic Epitopes. Front Immunol 2017; 8:115. [PMID: 28261200 PMCID: PMC5306364 DOI: 10.3389/fimmu.2017.00115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2016] [Accepted: 01/25/2017] [Indexed: 11/13/2022] Open
Abstract
Many pathogens, including the malaria parasite Plasmodium falciparum, display high levels of polymorphism within T-cell epitope regions of proteins associated with protective immunity. The T-cell epitope variants are often non-cross-reactive. Herein, we show in a murine model, which modifies a protective CD8 T-cell epitope from the circumsporozoite protein (CS) of Plasmodium berghei (SYIPSAEKI), that simultaneous or sequential co-stimulation with two of its putative similarly non-cross-reactive altered peptide ligand (APL) epitopes (SYIPSAEDI or SYIPSAEAI) has radically different effects on immunity. Hence, co-immunization or sequential stimulation in vivo of SYIPSAEKI with its APL antagonist SYIPSAEDI decreases immunity to both epitopes. By contrast, co-immunization with SYIPSAEAI has no apparent initial effect, but it renders the immune response to SYIPSAEKI resistant to being turned off by subsequent immunization with SYIPSAEDI. These results suggest a novel strategy for vaccines that target polymorphic epitopes potentially capable of mutual immune interference in the field, by initiating an immune response by co-immunization with the desired index epitope, together with a carefully selected "potentiator" APL peptide.
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Affiliation(s)
- Gabriela Minigo
- Vaccine and Infectious Diseases Laboratory, Department of Immunology and Pathology, Monash University, Melbourne, VIC, Australia; Global and Tropical Health Division, Menzies School of Health Research, Charles Darwin University, Darwin, NT, Australia
| | - Katie L Flanagan
- Vaccine and Infectious Diseases Laboratory, Department of Immunology and Pathology, Monash University, Melbourne, VIC, Australia; School of Medicine, University of Tasmania, Hobart, TAS, Australia
| | - Robyn M Slattery
- Diabetes Laboratory, Department of Immunology and Pathology, Monash University , Melbourne, VIC , Australia
| | - Magdalena Plebanski
- Vaccine and Infectious Diseases Laboratory, Department of Immunology and Pathology, Monash University , Melbourne, VIC , Australia
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10
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Montes de Oca M, Good MF, McCarthy JS, Engwerda CR. The Impact of Established Immunoregulatory Networks on Vaccine Efficacy and the Development of Immunity to Malaria. THE JOURNAL OF IMMUNOLOGY 2016; 197:4518-4526. [DOI: 10.4049/jimmunol.1600619] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/08/2016] [Accepted: 08/26/2016] [Indexed: 02/07/2023]
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Abstract
Parasites of the genus Plasmodium have a complex life cycle. They alternate between their final mosquito host and their intermediate hosts. The parasite can be either extra- or intracellular, depending on the stage of development. By modifying their shape, motility, and metabolic requirements, the parasite adapts to the different environments in their different hosts. The parasite has evolved to escape the multiple immune mechanisms in the host that try to block parasite development at the different stages of their development. In this article, we describe the mechanisms reported thus far that allow the Plasmodium parasite to evade innate and adaptive immune responses.
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Affiliation(s)
- Laurent Rénia
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Singapore
| | - Yun Shan Goh
- Singapore Immunology Network, Agency for Science, Technology and Research (A*STAR), Singapore
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12
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Sedegah M, Peters B, Hollingdale MR, Ganeshan HD, Huang J, Farooq F, Belmonte MN, Belmonte AD, Limbach KJ, Diggs C, Soisson L, Chuang I, Villasante ED. Vaccine Strain-Specificity of Protective HLA-Restricted Class 1 P. falciparum Epitopes. PLoS One 2016; 11:e0163026. [PMID: 27695088 PMCID: PMC5047630 DOI: 10.1371/journal.pone.0163026] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 09/01/2016] [Indexed: 11/19/2022] Open
Abstract
A DNA prime/adenovirus boost malaria vaccine encoding Plasmodium falciparum strain 3D7 CSP and AMA1 elicited sterile clinical protection associated with CD8+ T cell interferon-gamma (IFN-γ) cells responses directed to HLA class 1-restricted AMA1 epitopes of the vaccine strain 3D7. Since a highly effective malaria vaccine must be broadly protective against multiple P. falciparum strains, we compared these AMA1 epitopes of two P. falciparum strains (7G8 and 3D7), which differ by single amino acid substitutions, in their ability to recall CD8+ T cell activities using ELISpot and flow cytometry/intracellular staining assays. The 7G8 variant peptides did not recall 3D7 vaccine-induced CD8+ T IFN-γ cell responses in these assays, suggesting that protection may be limited to the vaccine strain. The predicted MHC binding affinities of the 7G8 variant epitopes were similar to the 3D7 epitopes, suggesting that the amino acid substitutions of the 7G8 variants may have interfered with TCR recognition of the MHC:peptide complex or that the 7G8 variant may have acted as an altered peptide ligand. These results stress the importance of functional assays in defining protective epitopes. Clinical Trials Registrations: NCT00870987, NCT00392015
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Affiliation(s)
- Martha Sedegah
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
| | - Bjoern Peters
- La Jolla Institute for Allergy and Immunology, La Jolla, CA, 92037, United States of America
| | - Michael R. Hollingdale
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
- * E-mail:
| | - Harini D. Ganeshan
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Jun Huang
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Fouzia Farooq
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Maria N. Belmonte
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Arnel D. Belmonte
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Keith J. Limbach
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
- Henry M. Jackson Foundation for the Advancement of Military Medicine, Rockville, MD, 20817, United States of America
| | - Carter Diggs
- USAID, Washington, DC, 20523, United States of America
| | | | - Ilin Chuang
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
| | - Eileen D. Villasante
- Malaria Department, Naval Medical Research Center, Silver Spring, MD, 20910, United States of America
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13
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Expressing Redundancy among Linear-Epitope Sequence Data Based on Residue-Level Physicochemical Similarity in the Context of Antigenic Cross-Reaction. Adv Bioinformatics 2016; 2016:1276594. [PMID: 27274725 PMCID: PMC4870339 DOI: 10.1155/2016/1276594] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Revised: 03/29/2016] [Accepted: 04/10/2016] [Indexed: 01/15/2023] Open
Abstract
Epitope-based design of vaccines, immunotherapeutics, and immunodiagnostics is complicated by structural changes that radically alter immunological outcomes. This is obscured by expressing redundancy among linear-epitope data as fractional sequence-alignment identity, which fails to account for potentially drastic loss of binding affinity due to single-residue substitutions even where these might be considered conservative in the context of classical sequence analysis. From the perspective of immune function based on molecular recognition of epitopes, functional redundancy of epitope data (FRED) thus may be defined in a biologically more meaningful way based on residue-level physicochemical similarity in the context of antigenic cross-reaction, with functional similarity between epitopes expressed as the Shannon information entropy for differential epitope binding. Such similarity may be estimated in terms of structural differences between an immunogen epitope and an antigen epitope with reference to an idealized binding site of high complementarity to the immunogen epitope, by analogy between protein folding and ligand-receptor binding; but this underestimates potential for cross-reactivity, suggesting that epitope-binding site complementarity is typically suboptimal as regards immunologic specificity. The apparently suboptimal complementarity may reflect a tradeoff to attain optimal immune function that favors generation of immune-system components each having potential for cross-reactivity with a variety of epitopes.
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Wilson KL, Xiang SD, Plebanski M. A Model to Study the Impact of Polymorphism Driven Liver-Stage Immune Evasion by Malaria Parasites, to Help Design Effective Cross-Reactive Vaccines. Front Microbiol 2016; 7:303. [PMID: 27014226 PMCID: PMC4786561 DOI: 10.3389/fmicb.2016.00303] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Accepted: 02/24/2016] [Indexed: 01/08/2023] Open
Abstract
Malaria parasites engage a multitude of strategies to evade the immune system of the host, including the generation of polymorphic T cell epitope sequences, termed altered peptide ligands (APLs). Herein we use an animal model to study how single amino acid changes in the sequence of the circumsporozoite protein (CSP), a major target antigen of pre-erythrocytic malaria vaccines, can lead to a reduction of cross reactivity by T cells. For the first time in any APL model, we further compare different inflammatory adjuvants (Montanide, Poly I:C), non-inflammatory adjuvants (nanoparticles), and peptide pulsed dendritic cells (DCs) for their potential capacity to induce broadly cross reactive immune responses. Results show that the capacity to induce a cross reactive response is primarily controlled by the T cell epitope sequence and cannot be modified by the use of different adjuvants. Moreover, we identify how specific amino acid changes lead to a one-way cross reactivity: where variant-x induced responses are re-elicited by variant-x and not variant-y, but variant-y induced responses can be re-elicited by variant-y and variant-x. We discuss the consequences of the existence of this one-way cross reactivity phenomenon for parasite immune evasion in the field, as well as the use of variant epitopes as a potential tool for optimized vaccine design.
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Affiliation(s)
- Kirsty L Wilson
- Vaccines and Infectious Diseases Laboratory, Department of Immunology and Pathology, Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University Melbourne, VIC, Australia
| | - Sue D Xiang
- Vaccines and Infectious Diseases Laboratory, Department of Immunology and Pathology, Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University Melbourne, VIC, Australia
| | - Magdalena Plebanski
- Vaccines and Infectious Diseases Laboratory, Department of Immunology and Pathology, Central Clinical School, Faculty of Medicine, Nursing and Health Sciences, Monash University Melbourne, VIC, Australia
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15
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Flanagan KL, Wilson KL, Plebanski M. Polymorphism in liver-stage malaria vaccine candidate proteins: immune evasion and implications for vaccine design. Expert Rev Vaccines 2015; 15:389-99. [PMID: 26610026 DOI: 10.1586/14760584.2016.1125785] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
The pre-erythrocytic stage of infection by malaria parasites represents a key target for vaccines that aim to eradicate malaria. Two important broad immune evasion strategies that can interfere with vaccine efficacy include the induction of dendritic cell (DC) dysfunction and regulatory T cells (Tregs) by blood-stage malaria parasites, leading to inefficient priming of T cells targeting liver-stage infections. The parasite also uses 'surgical strike' strategies, whereby polymorphism in pre-erythrocytic antigens can interfere with host immunity. Specifically, we review how even single amino acid changes in T cell epitopes can lead to loss of binding to major histocompatibility complex (MHC), lack of cross-reactivity, or antagonism and immune interference, where simultaneous or sequential stimulation with related variants of the same T cell epitope can cause T cell anergy or the conversion of effector to immunosuppressive T cell phenotypes.
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Affiliation(s)
- Katie L Flanagan
- a Vaccine and Infectious Diseases Laboratory, Department of Immunology , Monash University , Melbourne , VIC , Australia
| | - Kirsty L Wilson
- a Vaccine and Infectious Diseases Laboratory, Department of Immunology , Monash University , Melbourne , VIC , Australia
| | - Magdalena Plebanski
- a Vaccine and Infectious Diseases Laboratory, Department of Immunology , Monash University , Melbourne , VIC , Australia
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16
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Eickhoff CS, Van Aartsen D, Terry FE, Meymandi SK, Traina MM, Hernandez S, Martin WD, Moise L, De Groot AS, Hoft DF. An immunoinformatic approach for identification of Trypanosoma cruzi HLA-A2-restricted CD8(+) T cell epitopes. Hum Vaccin Immunother 2015; 11:2322-8. [PMID: 26107442 DOI: 10.1080/21645515.2015.1061160] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
Abstract
Chagas disease is a major neglected tropical disease caused by persistent chronic infection with the protozoan parasite Trypanosoma cruzi. An estimated 8 million people are infected with T. cruzi, however only 2 drugs are approved for treatment and no vaccines are available. Thus there is an urgent need to develop vaccines and new drugs to prevent and treat Chagas disease. In this work, we identify T cell targets relevant for human infection with T. cruzi. The trans-sialidase (TS) gene family is a large family of homologous genes within the T. cruzi genome encoding over 1,400 members. There are 12 highly conserved TS gene family members which encode enzymatically active TS (functional TS; F-TS), while the remaining TS family genes are less conserved, enzymatically inactive and have been hypothesized to be involved in immune evasion (non-functional TS; NF-TS). We utilized immunoinformatic tools to identify HLA-A2-restricted CD8(+) T cell epitopes conserved within F-TS family members and NF-TS gene family members. We also utilized a whole-genome approach to identify T cell epitopes present within genes which have previously been shown to be expressed in life stages relevant for human infection (Non-TS genes). Thirty immunogenic HLA-A2-restricted CD8(+) T cell epitopes were identified using IFN-γ ELISPOT assays after vaccination of humanized HLA-A2 transgenic mice with mature dendritic cells pulsed with F-TS, NF-TS, and Non-TS peptide pools. The immunogenic HLA-A2-restricted T cell epitopes identified in this work may serve as potential components of an epitope-based T cell targeted vaccine for Chagas disease.
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Affiliation(s)
- Christopher S Eickhoff
- a Division of Infectious Diseases, Allergy, and Immunology; Department of Internal Medicine; Saint Louis University ; Saint Louis , MO USA
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17
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Tselios T, Aggelidakis M, Tapeinou A, Tseveleki V, Kanistras I, Gatos D, Matsoukas J. Rational design and synthesis of altered peptide ligands based on human myelin oligodendrocyte glycoprotein 35-55 epitope: inhibition of chronic experimental autoimmune encephalomyelitis in mice. Molecules 2014; 19:17968-84. [PMID: 25375337 PMCID: PMC6270842 DOI: 10.3390/molecules191117968] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Revised: 10/24/2014] [Accepted: 10/27/2014] [Indexed: 11/16/2022] Open
Abstract
Experimental autoimmune encephalomyelitis (EAE) is a demyelinating disease of the central nervous system and is an animal model of multiple sclerosis (MS). Although the etiology of MS remains unclear, there is evidence T-cell recognition of immunodominant epitopes of myelin proteins, such as the 35–55 epitope of myelin oligodendrocyte glycoprotein (MOG), plays a pathogenic role in the induction of chronic EAE. Cyclization of peptides is of great interest since the limited stability of linear peptides restricts their potential use as therapeutic agents. Herein, we have designed and synthesized a number of linear and cyclic peptides by mutating crucial T cell receptor (TCR) contact residues of the human MOG35–55 epitope. In particular, we have designed and synthesized cyclic altered peptide ligands (APLs) by mutating Arg41 with Ala or Arg41 and Arg46 with Ala. The peptides were synthesized in solid phase on 2-chlorotrityl chloride resin (CLTR-Cl) using the Fmoc/t-Bu methodology. The purity of final products was verified by RP-HPLC and their identification was achieved by ESI-MS. It was found that the substitutions of Arg at positions 41 and 46 with Ala results in peptide analogues that reduce the severity of MOG-induced EAE clinical symptoms in C57BL/6 mice when co-administered with mouse MOG35–55 peptide at the time of immunization.
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Affiliation(s)
- Theodore Tselios
- Department of Chemistry, University of Patras, 26500 Patras, Greece.
| | | | - Anthi Tapeinou
- Department of Chemistry, University of Patras, 26500 Patras, Greece.
| | - Vivian Tseveleki
- Department of Molecular Genetics, Hellenic Pasteur Institute, 11521 Athens, Greece.
| | - Ioannis Kanistras
- Department of Molecular Genetics, Hellenic Pasteur Institute, 11521 Athens, Greece.
| | - Dimitrios Gatos
- Department of Chemistry, University of Patras, 26500 Patras, Greece.
| | - John Matsoukas
- Department of Chemistry, University of Patras, 26500 Patras, Greece.
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18
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Trost B, Kusalik A, Lucchese G, Kanduc D. Bacterial peptides are intensively present throughout the human proteome. SELF NONSELF 2014; 1:71-74. [PMID: 21559180 DOI: 10.4161/self.1.1.9588] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2009] [Revised: 07/16/2009] [Accepted: 07/22/2009] [Indexed: 11/19/2022]
Abstract
Forty bacterial proteomes-20 pathogens and 20 non-pathogens-were examined for amino acid sequence similarity to the human proteome. All bacterial proteomes, independent of their pathogenicity, share hundreds of nonamer sequences with the human proteome. This overlap is very widespread, with one third of human proteins sharing at least one nonapeptide with one of these bacteria. On the whole, the bacteria-versus-human nonamer overlap is numerically defined by 47,610 total perfect matches disseminated through 10,701 human proteins. These findings open new perspectives on the immune relationship between bacteria and host, and might help our understanding of fundamental phenomena such as self-nonself discrimination and tolerance versus auto-reactivity.
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Affiliation(s)
- Brett Trost
- Department of Computer Science; University of Saskatchewan; Saskatoon, SK CA
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19
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Krzych U, Zarling S, Pichugin A. Memory T cells maintain protracted protection against malaria. Immunol Lett 2014; 161:189-95. [PMID: 24709142 DOI: 10.1016/j.imlet.2014.03.011] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2014] [Revised: 03/25/2014] [Accepted: 03/27/2014] [Indexed: 10/25/2022]
Abstract
Immunologic memory is one of the cardinal features of antigen-specific immune responses, and the persistence of memory cells contributes to prophylactic immunizations against infectious agents. Adequately maintained memory T and B cell pools assure a fast, effective and specific response against re-infections. However, many aspects of immunologic memory are still poorly understood, particularly immunologic memory inducible by parasites, for example, Plasmodium spp., the causative agents of malaria. For example, memory responses to Plasmodium antigens amongst residents of malaria endemic areas appear to be either inadequately developed or maintained, because persons who survive episodes of childhood malaria remain vulnerable to intermittent malaria infections. By contrast, multiple exposures of humans and laboratory rodents to radiation-attenuated Plasmodium sporozoites (γ-spz) induce sterile and long-lasting protection against experimental sporozoite challenge. Multifactorial immune mechanisms maintain this protracted and sterile protection. While the presence of memory CD4 T cell subsets has been associated with lasting protection in humans exposed to multiple bites from Anopheles mosquitoes infected with attenuated Plasmodium falciparum, memory CD8 T cells maintain protection induced with Plasmodium yoelii and Plasmodium berghei γ-spz in murine models. In this review, we discuss our observations that show memory CD8 T cells specific for antigens expressed by P. berghei liver stage parasites as an indispensable component for the maintenance of protracted protective immunity against experimental malaria infection; moreover, the provision of an Ag-depot assures a quick recall of memory T cells as IFN-γ-producing effector CD8 T cells and IL-4- producing CD4 T cells that collaborate with B cells for an effective antibody response.
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Affiliation(s)
- Urszula Krzych
- Department of Cellular Immunology, Branch of Malaria Vaccine Development, Walter Reed Army Institute of Research, Silver Spring, MD 20910, United States.
| | - Stasya Zarling
- Department of Cellular Immunology, Branch of Malaria Vaccine Development, Walter Reed Army Institute of Research, Silver Spring, MD 20910, United States
| | - Alexander Pichugin
- Department of Cellular Immunology, Branch of Malaria Vaccine Development, Walter Reed Army Institute of Research, Silver Spring, MD 20910, United States
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20
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Elias SC, Collins KA, Halstead FD, Choudhary P, Bliss CM, Ewer KJ, Sheehy SH, Duncan CJA, Biswas S, Hill AVS, Draper SJ. Assessment of immune interference, antagonism, and diversion following human immunization with biallelic blood-stage malaria viral-vectored vaccines and controlled malaria infection. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2013; 190:1135-47. [PMID: 23293353 PMCID: PMC3672846 DOI: 10.4049/jimmunol.1201455] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Overcoming antigenic variation is one of the major challenges in the development of an effective vaccine against Plasmodium falciparum, a causative agent of human malaria. Inclusion of multiple Ag variants in subunit vaccine candidates is one strategy that has aimed to overcome this problem for the leading blood-stage malaria vaccine targets, that is, merozoite surface protein 1 (MSP1) and apical membrane Ag 1 (AMA1). However, previous studies, utilizing malaria Ags, have concluded that inclusion of multiple allelic variants, encoding altered peptide ligands, in such a vaccine may be detrimental to both the priming and in vivo restimulation of Ag-experienced T cells. In this study, we analyze the T cell responses to two alleles of MSP1 and AMA1 induced by vaccination of malaria-naive adult volunteers with bivalent viral-vectored vaccine candidates. We show a significant bias to the 3D7/MAD20 allele compared with the Wellcome allele for the 33 kDa region of MSP1, but not for the 19 kDa fragment or the AMA1 Ag. Although this bias could be caused by "immune interference" at priming, the data do not support a significant role for "immune antagonism" during memory T cell restimulation, despite observation of the latter at a minimal epitope level in vitro. A lack of class I HLA epitopes in the Wellcome allele that are recognized by vaccinated volunteers may in fact contribute to the observed bias. We also show that controlled infection with 3D7 strain P. falciparum parasites neither boosts existing 3D7-specific T cell responses nor appears to "immune divert" cellular responses toward the Wellcome allele.
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Affiliation(s)
- Sean C Elias
- The Jenner Institute, University of Oxford, Oxford OX3 7DQ, United Kingdom.
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21
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Krzych U, Dalai S, Zarling S, Pichugin A. Memory CD8 T cells specific for plasmodia liver-stage antigens maintain protracted protection against malaria. Front Immunol 2012; 3:370. [PMID: 23233854 PMCID: PMC3517952 DOI: 10.3389/fimmu.2012.00370] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2012] [Accepted: 11/20/2012] [Indexed: 01/15/2023] Open
Abstract
Immunologic memory induced by pathogenic agents or vaccinations is inextricably linked to long-lasting protection. Adequately maintained memory T and B cell pools assure a fast, effective, and specific response against re-infections. Studies of immune responses amongst residents of malaria endemic areas suggest that memory responses to Plasmodia antigens appear to be neither adequately developed nor maintained, because persons who survive episodes of childhood malaria remain vulnerable to persistent or intermittent malaria infections. By contrast, multiple exposures of humans and laboratory rodents to radiation-attenuated Plasmodia sporozoites (γ-spz) induces sterile and long-lasting protection against experimental sporozoite challenge. Protection is associated with MHC-class I-dependent CD8 T cells, the key effectors against pre-erythrocytic stage infection. We have adopted the P. berghei γ-spz mouse model to study memory CD8 T cells that are specific for antigens expressed by Pb liver-stage (LS) parasites and are found predominantly in the liver. On the basis of phenotypic and functional characteristics, we have demonstrated that liver CD8 T cells form two subsets: CD44hiCD62LloKLRG-1+CD107+CD127−CD122loCD8 T effector/effector memory (TE/EM) cells that are the dominant IFN-γ producers and CD44hiCD62LhiKLRG-1−CD107−CD127+CD122hiCD8 T central memory (TCM) cells. In this review, we discuss our observations concerning the role of CD8 TE/EM and CD8 TCM cells in the maintenance of protracted protective immunity against experimental malaria infection. Finally, we present a hypothesis consistent with a model whereby intrahepatic CD8 TCM cells, that are maintained in part by LS-Ag depot and by IL-15-mediated survival and homeostatic proliferation, form a reservoir of cells ready for conscription to CD8 TE/EM cells needed to prevent re-infections.
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Affiliation(s)
- Urszula Krzych
- Department of Cellular Immunology, Branch of Military Malaria Vaccine Development, Walter Reed Army Institute of Research Silver Spring, MD, USA
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22
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Prevalence and implications of multiple-strain infections. THE LANCET. INFECTIOUS DISEASES 2011; 11:868-78. [DOI: 10.1016/s1473-3099(11)70241-9] [Citation(s) in RCA: 166] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Abstract
T cell recognition of antigen is a crucial aspect of the adaptive immune response. One of the most common means of pathogen immune evasion is mutation of T cell epitopes. T cell recognition of such ligands can result in a variety of outcomes including activation, apoptosis and anergy. The ability of a given T cell to respond to a specific peptide-MHC ligand is regulated by a number of factors, including the affinity, on- and off-rates and half-life of the TCR-peptide-MHC interaction. Interaction of T cells with low-potency ligands results in unique signaling patterns and requires engagement with a larger number of T cell receptors than agonist ligands. This review will address these aspects of T cell interaction with weak ligands and the ways in which these ligands have been utilized therapeutically.
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24
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Yamazaki A, Yasunami M, Ofori M, Horie H, Kikuchi M, Helegbe G, Takaki A, Ishii K, Omar AH, Akanmori BD, Hirayama K. Human leukocyte antigen class I polymorphisms influence the mild clinical manifestation of Plasmodium falciparum infection in Ghanaian children. Hum Immunol 2011; 72:881-8. [PMID: 21756958 DOI: 10.1016/j.humimm.2011.06.007] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 06/13/2011] [Accepted: 06/27/2011] [Indexed: 10/18/2022]
Abstract
A prospective study that included 429 children for active detection of mild malaria was conducted in a coastal region of Ghana to reveal whether the incidence of malaria is affected by human leukocyte antigen (HLA) polymorphism. During 12 months of follow-up, 85 episodes of mild clinical malaria in 74 individuals were observed, and 34 episodes among them were accompanied with significant parasitemia at >5000 infected red blood cells per cubic millimeter. Attributable and relative risks conferred by genetic factors in the HLA region were evaluated by comparison of the incidence in children, stratified by carrier status, of a given allele of HLA-A, -B, -DRB1 and TNFA promoter polymorphism. HLA-B*35:01 reduced the incidence by 0.178 events per person per year (0.060 versus 0.239 for B*35:01-positive and -negative subpopulations, respectively), and a relative risk of 0.25, which remained statistically significant after Bonferroni's correction for multiple testing (p(c) = 8.2 × 10(-5)). Further, HLA-B*35:01 and -B*53:01 exhibited opposite effects on the incidence of malaria with significant parasitemia. When parasite densities in different HLA carriers status were compared, HLA-A*01 conferred an increase in parasite load (p = 6.0 × 10(-7)). In addition, we found a novel DRB1 allele that appears to have emerged from DRB1*03:02 by single nucleotide substitution.
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Affiliation(s)
- Akiko Yamazaki
- Department of Immunogenetics, Institute of Tropical Medicine (NEKKEN), Nagasaki University, Nagasaki, Japan
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25
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Abstract
Malaria is a vector-borne infectious disease caused by unicellular parasites of the genus Plasmodium. These obligate intracellular parasites have the unique capacity to infect and replicate within erythrocytes, which are terminally differentiated host cells that lack antigen presentation pathways. Prior to the cyclic erythrocytic infections that cause the characteristic clinical symptoms of malaria, the parasite undergoes an essential and clinically silent expansion phase in the liver. By infecting privileged host cells, employing programs of complex life stage conversions and expressing varying immunodominant antigens, Plasmodium parasites have evolved mechanisms to downmodulate protective immune responses against ongoing and even future infections. Consequently, anti-malaria immunity develops only gradually over many years of repeated and multiple infections in endemic areas. The identification of immune correlates of protection among the abundant non-protective host responses remains a research priority. Understanding the molecular and immunological mechanisms of the crosstalk between the parasite and the host is a prerequisite for the rational discovery and development of a safe, affordable, and protective anti-malaria vaccine.
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Affiliation(s)
- Julius Clemence Hafalla
- Department of Immunology and Infection, Faculty of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK.
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26
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Simo G, Njitchouang GR, Njiokou F, Cuny G, Asonganyi T. Trypanosoma brucei s.l.: Microsatellite markers revealed high level of multiple genotypes in the mid-guts of wild tsetse flies of the Fontem sleeping sickness focus of Cameroon. Exp Parasitol 2011; 128:272-8. [PMID: 21376044 DOI: 10.1016/j.exppara.2011.02.023] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2010] [Revised: 10/25/2010] [Accepted: 02/21/2011] [Indexed: 11/27/2022]
Abstract
To identify Trypanosoma brucei genotypes which are potentially transmitted in a sleeping sickness focus, microsatellite markers were used to characterize T. brucei found in the mid-guts of wild tsetse flies of the Fontem sleeping sickness focus in Cameroon. For this study, two entomological surveys were performed during which 2685 tsetse flies were collected and 1596 (59.2%) were dissected. Microscopic examination revealed 1.19% (19/1596) mid-gut infections with trypanosomes; the PCR method identified 4.7% (75/1596) infections with T. brucei in the mid-guts. Of these 75 trypanosomes identified in the mid-guts, Trypanosoma brucei gambiense represented 0.81% (13/1596) of them, confirming the circulation of human infective parasite in the Fontem focus. Genetic characterization of the 75 T. brucei samples using five microsatellite markers revealed not only multiple T. brucei genotypes (47%), but also single genotypes (53%) in the mid-guts of the wild tsetse flies. These results show that there is a wide range of trypanosome genotypes circulating in the mid-guts of wild tsetse flies from the Fontem sleeping sickness focus. They open new avenues to undertake investigations on the maturation of multiple infections observed in the tsetse fly mid-guts. Such investigations may allow to understand how the multiple infections evolve from the tsetse flies mid-guts to the salivary glands and also to understand the consequence of these evolutions on the dynamic (which genotype is transmitted to mammals) of trypanosomes transmission.
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Affiliation(s)
- Gustave Simo
- Department of Biochemistry, Faculty of Science, P.O. Box 67, University of Dschang, Dschang, Cameroon.
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Balmer O, Stearns SC, Schötzau A, Brun R. Intraspecific competition between co-infecting parasite strains enhances host survival in African trypanosomes. Ecology 2009; 90:3367-78. [DOI: 10.1890/08-2291.1] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Putaporntip C, Jongwutiwes S, Hughes AL. Natural selection maintains a stable polymorphism at the circumsporozoite protein locus of Plasmodium falciparum in a low endemic area. INFECTION GENETICS AND EVOLUTION 2009; 9:567-73. [PMID: 19460323 DOI: 10.1016/j.meegid.2009.02.006] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 02/06/2009] [Accepted: 02/16/2009] [Indexed: 11/29/2022]
Abstract
Circumsporozoite protein gene sequences of Plasmodium falciparum were collected in 1996-1997 and in 2006-2007 from a single endemic area in Thailand. Repeat units were more similar within the same haplotype than between haplotypes, supporting the hypothesis that repeat arrays evolve by a process of concerted evolution. There was evidence that natural selection has favored amino acid changes in the Th2R and Th3R T-cell epitope regions. One haplotype in these epitopes, designated *5/*1, occurred in approximately 70% of sequences in both collection periods. The most common other haplotypes differed from *5/*1 by at least two amino acid replacements; and divergence in the epitopes was correlated with divergence in the repeats. These patterns are most consistent with balancing selection driven by interactions with the immune system of the vertebrate host, probably involving both T-cell recognition of the Th2R and Th3R epitopes and antibody responses to the repeats.
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Affiliation(s)
- Chaturong Putaporntip
- Department of Parasitology, Faculty of Medicine, Molecular Biology of Malaria and Opportunistic Parasites Research Unit, Chulalongkorn University, Bangkok, Thailand
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Katsara M, Minigo G, Plebanski M, Apostolopoulos V. The good, the bad and the ugly: how altered peptide ligands modulate immunity. Expert Opin Biol Ther 2009; 8:1873-84. [PMID: 18990075 DOI: 10.1517/14712590802494501] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
BACKGROUND The basis of T cell immune responses is the specific recognition of an immunogenic peptide epitope by a T cell receptor. Peptide alterations of such T cell epitopes with single or few amino acid variations can have drastic effects on the outcome of this recognition. These altered peptide ligands can act as modulators of immune responses as they are capable of downregulating or upregulating responses. OBJECTIVE/METHODS We review how altered peptide ligands can have 'good' 'bad' and 'ugly' outcomes in treating diseases. RESULTS/CONCLUSION Altered peptide ligands have been used as immunotherapeutics in autoimmune (and allergic) diseases, infectious diseases and cancer. In the next five years we anticipate seeing a number of altered peptide ligands in clinical trials, progressing from contradictory classifications of good, bad or ugly, to the exciting outcome of 'useful'.
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Affiliation(s)
- Maria Katsara
- Immunology and Vaccine Laboratory, The Macfarlane Burnet Institute incorporating The Austin Research Institute, Studley Road, Heidelberg, VIC 3084, Australia
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Malaria vaccines: into a mirror, darkly? Trends Parasitol 2008; 24:532-6. [DOI: 10.1016/j.pt.2008.09.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2008] [Revised: 09/08/2008] [Accepted: 09/10/2008] [Indexed: 12/25/2022]
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A cluster of four surface antigen genes specifically expressed in bradyzoites, SAG2CDXY, plays an important role in Toxoplasma gondii persistence. Infect Immun 2008; 76:2402-10. [PMID: 18347037 DOI: 10.1128/iai.01494-07] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Toxoplasma gondii is one of the most successful protozoan parasites of warm-blooded animals. Stage-specific expression of its surface molecules is thought to be key to its ability to establish chronic infection in immunocompetent animals. The rapidly dividing tachyzoite stage displays a different subset of family of surface antigen 1 (SAG1)-related sequences (SRSs) from that displayed by the encysted bradyzoite stage. It is possible that this switch is necessary to protect the bradyzoites against an immune response raised against the tachyzoite stage. Alternatively, it might be that bradyzoite SRSs evolved to facilitate invasion of different cell types, such as those found in the brain, where cysts develop, or the small intestine, where bradyzoites must enter after oral infection. Here we studied the function of a cluster of four tandem genes, encoding bradyzoite SRSs called SAG2C, -D, -X, and -Y. Using bioluminescence imaging of mice infected with parasites expressing firefly luciferase (FLUC) driven by the SAG2D promoter, we show stage conversion for the first time in living animals. A truncated version of the SAG2D promoter (SAG2Dmin) gave efficient expression of FLUC in both tachyzoites and bradyzoites, indicating that the bradyzoite specificity of the complete SAG2D promoter is likely due to an element(s) that normally suppresses expression in tachyzoites. Comparing mice infected with the wild type or a mutant where the SAG2CDXY cluster of genes has been deleted (DeltaSAG2CDXY), we demonstrate that whereas DeltaSAG2CDXY parasites are less capable of maintaining a chronic infection in the brain, they do not show a defect in oral infectivity.
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Létourneau S, Im EJ, Mashishi T, Brereton C, Bridgeman A, Yang H, Dorrell L, Dong T, Korber B, McMichael AJ, Hanke T. Design and pre-clinical evaluation of a universal HIV-1 vaccine. PLoS One 2007; 2:e984. [PMID: 17912361 PMCID: PMC1991584 DOI: 10.1371/journal.pone.0000984] [Citation(s) in RCA: 229] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2007] [Accepted: 09/13/2007] [Indexed: 02/08/2023] Open
Abstract
Background One of the big roadblocks in development of HIV-1/AIDS vaccines is the enormous diversity of HIV-1, which could limit the value of any HIV-1 vaccine candidate currently under test. Methodology and Findings To address the HIV-1 variation, we designed a novel T cell immunogen, designated HIVCONSV, by assembling the 14 most conserved regions of the HIV-1 proteome into one chimaeric protein. Each segment is a consensus sequence from one of the four major HIV-1 clades A, B, C and D, which alternate to ensure equal clade coverage. The gene coding for the HIVCONSV protein was inserted into the three most studied vaccine vectors, plasmid DNA, human adenovirus serotype 5 and modified vaccine virus Ankara (MVA), and induced HIV-1-specific T cell responses in mice. We also demonstrated that these conserved regions prime CD8+ and CD4+ T cell to highly conserved epitopes in humans and that these epitopes, although usually subdominant, generate memory T cells in patients during natural HIV-1 infection. Significance Therefore, this vaccine approach provides an attractive and testable alternative for overcoming the HIV-1 variability, while focusing T cell responses on regions of the virus that are less likely to mutate and escape. Furthermore, this approach has merit in the simplicity of design and delivery, requiring only a single immunogen to provide extensive coverage of global HIV-1 population diversity.
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Affiliation(s)
- Sven Létourneau
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Eung-Jun Im
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Tumelo Mashishi
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Choechoe Brereton
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Anne Bridgeman
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Hongbing Yang
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Lucy Dorrell
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Tao Dong
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Bette Korber
- Los Alamo National Laboratory, Theoretical Biology and Biophysics, Los Alamos, New Mexico, United States of America
- The Santa Fe Institute, Santa Fe, New Mexico, United States of America
| | - Andrew J. McMichael
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
| | - Tomáš Hanke
- Medical Research Council Human Immunology Unit, Weatherall Institute of Molecular Medicine, University of Oxford, The John Radcliffe, Oxford, United Kingdom
- * To whom correspondence should be addressed. E-mail:
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Larke N, Im EJ, Wagner R, Williamson C, Williamson AL, McMichael AJ, Hanke T. Combined single-clade candidate HIV-1 vaccines induce T cell responses limited by multiple forms of in vivo immune interference. Eur J Immunol 2007; 37:566-77. [PMID: 17230443 DOI: 10.1002/eji.200636711] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We assessed in mice whether broad CD8+ T cell responses capable of efficient recognition of multiple HIV-1 clades could be induced using current single-clade vaccine constructs that were or will be used in clinical trials in Europe and Africa. We found that single-clade A, B and C vaccines applied alone induced only limited cross-clade reactivity and that the epitope hierarchy varied according to the immunizing clade. However, combining single-clade HIV-1 vaccines into multi-clade formulations resulted in multiple forms of in vivo immune interference such as original antigenic sin and antagonism, which dampened or even abrogated induction of responses to epitope variants and reduced the breadth of induced T cell responses. Simultaneous administration of individual clade-specific vaccines into anatomically separated sites on the body alleviated antagonism and increased the number of detectable epitope responses. Although cross-reactivity of murine CD8+ T cells does not directly translate to humans, the molecular interactions involved in triggering T cell responses are the same in mouse and man. Thus, these results have important ramifications for the design of both prophylactic and therapeutic vaccines against HIV-1 and other highly variable pathogens.
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Affiliation(s)
- Natasha Larke
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
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Mottram PL, Leong D, Crimeen-Irwin B, Gloster S, Xiang SD, Meanger J, Ghildyal R, Vardaxis N, Plebanski M. Type 1 and 2 immunity following vaccination is influenced by nanoparticle size: formulation of a model vaccine for respiratory syncytial virus. Mol Pharm 2007; 4:73-84. [PMID: 17274665 DOI: 10.1021/mp060096p] [Citation(s) in RCA: 215] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Previous studies compared uptake by dendritic cells (DC) of 20, 40, 100, 200, 500, 1000, and 2000 nm beads in vivo. When beads were used as antigen carriers, bead size influenced antibody responses and induction of IFN-gamma-producing CD4 and CD8 T cells. Beads of 40-50 nm were taken up preferentially by DC and induced particularly strong immunity. Herein, we examine immunity induced by minute differences in nanobead size, specifically within a narrow viral-sized range (20, 40, 49, 67, 93, 101, and 123 nm), to see if bead carrier size influenced the induction of type 1 or type 2 cells as demonstrated by the production of IFN-gamma or IL-4. In vivo uptake by DC was assessed for selected sizes in this range. Responses to whole ovalbumin (OVA) or the OVA-derived CD8 T cell peptide epitope (SIINFEKL) were tested. After one immunization with beads-OVA, IFN-gamma responses to both OVA and SIINFEKL were significantly better with 40 and 49 nm beads than other sizes, while, in contrast, IL-4 responses to OVA were higher after immunization with OVA conjugated to larger beads (93, 101, and 123 nm). Thus IFN-gamma induction from CD8 T cells was limited to 40-49 nm beads, while CD4 T cell activation and IL-4 were induced by 93-123 nm beads-OVA. After two immunizations, there were comparable high levels of IFN-gamma produced with 40 and 49 beads and IL-4 reactivity was still higher for larger beads (93, 101, 123 nm). Production of IgG1 was seen across the full range of bead sizes, increasing after two immunizations. Since protection against respiratory syncytial virus (RSV) depends on strong IFN responses, while IL-4 responses are reported to cause asthma-like symptoms, immunization with RSV antigens on the 49 nm carrier beads could provide the basis for a suitable vaccine. When the 49 nm beads were conjugated to RSV proteins G88 (surface) or M2.1 (internal capsid), one immunization with G88 induced high levels of IFN-gamma and low levels of IL-4. IL-4 increased with two immunizations. Beads-M2.1 induced only moderate levels of IFN-gamma and low titer antibody after two immunizations. Mice vaccinated once with G88-conjugated 49 nm beads and challenged intranasally with RSV strain A2 subtype showed reduced viral titers and recovered from weight loss more rapidly than mice immunized with M2.1-conjugated 49 nm beads or naive control mice. These results show that precise selection of nanobead size for vaccination can influence the type 1/type 2 cytokine balance after one immunization, and this will be useful in the development of effective vaccines against common human pathogens such as RSV.
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Affiliation(s)
- Patricia L Mottram
- The Burnet Institute at Austin (Austin Research Institute), Studley Road, Heidelberg 3084, VIC, Australia
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Martin DL, Weatherly DB, Laucella SA, Cabinian MA, Crim MT, Sullivan S, Heiges M, Craven SH, Rosenberg CS, Collins MH, Sette A, Postan M, Tarleton RL. CD8+ T-Cell responses to Trypanosoma cruzi are highly focused on strain-variant trans-sialidase epitopes. PLoS Pathog 2006; 2:e77. [PMID: 16879036 PMCID: PMC1526708 DOI: 10.1371/journal.ppat.0020077] [Citation(s) in RCA: 183] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2006] [Accepted: 06/26/2006] [Indexed: 01/30/2023] Open
Abstract
CD8+ T cells are crucial for control of a number of medically important protozoan parasites, including Trypanosoma cruzi, the agent of human Chagas disease. Yet, in contrast to the wealth of information from viral and bacterial infections, little is known about the antigen specificity or the general development of effector and memory T-cell responses in hosts infected with protozoans. In this study we report on a wide-scale screen for the dominant parasite peptides recognized by CD8+ T cells in T. cruzi–infected mice and humans. This analysis demonstrates that in both hosts the CD8+ T-cell response is highly focused on epitopes encoded by members of the large trans-sialidase family of genes. Responses to a restricted set of immunodominant peptides were especially pronounced in T. cruzi–infected mice, with more than 30% of the CD8+ T-cell response at the peak of infection specific for two major groups of trans-sialidase peptides. Experimental models also demonstrated that the dominance patterns vary depending on the infective strain of T. cruzi, suggesting that immune evasion may be occurring at a population rather than single-parasite level. The authors of this paper conducted a broad screen to identify the major proteins in Trypanosoma cruzi, the causative agent of Chagas disease, that allow for detection and control of this intracellular pathogen by CD8+ T cells. This study is the first to show that a complex pathogen such as T. cruzi elicits a T-cell response focused on a few peptides, despite having a genome of >12,000 genes capable of encoding hundreds of thousands of potential target epitopes. The immunodominant CD8+ T-cell targets in both murine and human T. cruzi infection are almost exclusively peptides within multiple trans-sialidase proteins that are encoded by the large and diverse trans-sialidase gene family. trans-sialidase genes show great potential for variation, and the frequency of individual trans-sialidase epitopes appears to vary significantly in different parasite strains, giving rise to distinct patterns of T-cell responses to different T. cruzi isolates. The authors hypothesize that the massive expansion of this gene family under immunological pressure and the resulting variable expression of specific T-cell epitopes provides a mechanism of immune escape for T. cruzi.
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Affiliation(s)
- Diana L Martin
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
| | - D. Brent Weatherly
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Susana A Laucella
- Instituto Nacional de Parasiologia Dr. Mario Fatala Chaben/Administración Nacional de Laboratorios e Institutos de Salud “Dr. Carlos G. Malbrán” (ANLIS/Malbran), Buenos Aires, Argentina
| | - Melissa A Cabinian
- Department of Microbiology, University of Georgia, Athens, Georgia, United States of America
| | - Matthew T Crim
- Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America
| | - Susan Sullivan
- Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America
| | - Mark Heiges
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
| | - Sarah H Craven
- Department of Microbiology, University of Georgia, Athens, Georgia, United States of America
| | - Charles S Rosenberg
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
- Department of Microbiology, University of Georgia, Athens, Georgia, United States of America
| | - Matthew H Collins
- Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America
| | - Alessandro Sette
- La Jolla Institute for Allergy and Immunology, San Diego, California, United States of America
| | - Miriam Postan
- Instituto Nacional de Parasiologia Dr. Mario Fatala Chaben/Administración Nacional de Laboratorios e Institutos de Salud “Dr. Carlos G. Malbrán” (ANLIS/Malbran), Buenos Aires, Argentina
| | - Rick L Tarleton
- Center for Tropical and Emerging Global Diseases, University of Georgia, Athens, Georgia, United States of America
- Department of Cellular Biology, University of Georgia, Athens, Georgia, United States of America
- * To whom correspondence should be addressed. E-mail:
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Lee EAM, Flanagan KL, Minigo G, Reece WHH, Bailey R, Pinder M, Hill AVS, Plebanski M. Dimorphic Plasmodium falciparum merozoite surface protein-1 epitopes turn off memory T cells and interfere with T cell priming. Eur J Immunol 2006; 36:1168-78. [PMID: 16619284 DOI: 10.1002/eji.200526010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The leading blood-stage malaria vaccine candidate antigen, Plasmodium falciparum merozoite surface protein-1 (MSP-1) occurs in two major allelic types worldwide. The molecular basis promoting this stable dimorphism is unknown. In this study, we have shown that allelic altered peptide ligand (APL) T cell epitopes of MSP-1 mutually inhibited IFN-gamma secretion as well as proliferation of CD4+ T cells in 27/34 malaria exposed Gambian volunteers. Besides this inhibition of malaria-specific immunity, the same variant epitopes were also able to impair the priming of human T cells in malaria naive individuals. Epitope variants capable of interfering with T cell priming as well as inhibiting memory T cell effector functions offer a uniquely potent combination for immune evasion. Indeed, enhanced co-habitation of parasites bearing such antagonistic allelic epitope regions was observed in a study of 321 West African children, indicating a survival advantage for parasites able to engage this inhibitory immune interference mechanism.
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Affiliation(s)
- Edwin A M Lee
- Molecular Immunology Group, Weatherall Institute of Molecular Medicine, Nuffield Department of Medicine, University of Oxford, John Radcliffe Hospital, Oxford, UK
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Buscaglia CA, Campo VA, Frasch ACC, Di Noia JM. Trypanosoma cruzi surface mucins: host-dependent coat diversity. Nat Rev Microbiol 2006; 4:229-36. [PMID: 16489349 DOI: 10.1038/nrmicro1351] [Citation(s) in RCA: 209] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The surface of the protozoan parasite Trypanosoma cruzi is covered in mucins, which contribute to parasite protection and to the establishment of a persistent infection. Their importance is highlighted by the fact that the approximately 850 mucin-encoding genes comprise approximately 1% of the parasite genome and approximately 6% of all predicted T. cruzi genes. The coordinate expression of a large repertoire of mucins containing variable regions in the mammal-dwelling stages of the T. cruzi life cycle suggests a possible strategy to thwart the host immune response. Here, we discuss the expression profiling of T. cruzi mucins, the mechanisms leading to the acquisition of mucin diversity and the possible consequences of a mosaic surface coat in the interplay between parasite and host.
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Affiliation(s)
- Carlos A Buscaglia
- Instituto de Investigaciones Biotecnológicas-Instituto Tecnológico de Chascomús (IIB-INTECH), Universidad Nacional de General San Martn-CONICET, San Martín (1650), Buenos Aires, Argentina
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Hafalla JCR, Cockburn IA, Zavala F. Protective and pathogenic roles of CD8+ T cells during malaria infection. Parasite Immunol 2006; 28:15-24. [PMID: 16438672 DOI: 10.1111/j.1365-3024.2006.00777.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
CD8+ T cells play a key role in protection against pre-erythrocytic stages of malaria infection. Many vaccine strategies are based on the idea of inducing a strong infection-blocking CD8+ T cell response. Here, we summarize what is known about the development, specificity and protective effect of malaria-specific CD8+ T cells and report on recent developments in the field. Although work in mouse models continues to make progress in our understanding of the basic biology of these cells, many questions remain to be answered - particularly on the roles of these cells in human infections. Increasing evidence is also emerging of a harmful role for CD8+ T cells in the pathology of cerebral malaria in rodent systems. Once again, the relevance of these results to human disease is one of the primary questions facing workers in this field.
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Affiliation(s)
- J C R Hafalla
- Department of Medical Parasitology, New York University School of Medicine, New York, NY, USA
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Balmer O, Tostado C. New fluorescence markers to distinguish co-infecting Trypanosoma brucei strains in experimental multiple infections. Acta Trop 2006; 97:94-101. [PMID: 16212925 DOI: 10.1016/j.actatropica.2005.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2005] [Revised: 08/16/2005] [Accepted: 09/09/2005] [Indexed: 11/20/2022]
Abstract
Multiple-genotype infections are increasingly recognized as important factors in disease evolution, parasite transmission dynamics, and the evolution of drug resistance. However, the distinction of co-infecting parasite genotypes and the tracking of their dynamics have been difficult with traditional methods based on various genotyping techniques, leaving most questions unaddressed. Here we report new fluorescence markers of various colours that are inserted into the genome of Trypanosoma brucei to phenotypically label live parasites of all life cycle stages. If different parasite strains are labelled with different colours they can be easily distinguished from each other in experimental studies. A total of 10 T. brucei strains were successfully transfected with different fluorescence markers and were monitored in culture, tsetse flies and mice, to demonstrate stability of marker expression. The use of fluorescence activated cell sorting (FACS) allowed rapid and accurate identification of parasite strains labelled with different markers. Cell counts by FACS were virtually identical to counts by traditional microscopy (n=75, Spearman's rho: 0.91, p<0.0001) but were considerably faster and had a significantly lower sampling error (66% lower, d.f.=73, t=-17.1, p<0.0001). Co-infecting strains transfected with fluorescence genes of different colour were easily distinguished by eye and their relative and absolute densities were reliably counted by FACS in experimental multiple infections in mice. Since the FACS can simultaneously determine the population sizes of differently labelled T. brucei strains or subspecies it allows detailed and efficient tracking of multiple-genotype infections within a single host or vector individual, enabling more powerful studies on parasite dynamics. In addition, it also provides a simple way to separate genotypes after experimental mixed infections, to measure responses of the single strains to an applied treatment, thus eliminating the need for laborious cloning steps. The markers presented broaden the spectrum of tools available for experimental studies on multiple-genotype infections. They are fundamentally different from isoenzyme analysis and other genotyping approaches in that they allow the distinction of parasite genotypes based on an easily recognizable phenotypic trait. They will be of specific interest to researches addressing ecological, evolutionary and epidemiological questions using trypanosomes as an experimental system.
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Affiliation(s)
- Oliver Balmer
- Yale University, Department of Ecology and Evolutionary Biology, 165 Prospect Street, New Haven, CT 06511, USA.
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40
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Abstract
Multiple injections of gamma-radiation-attenuated Plasmodium sporozoites (gamma-spz) can induce long-lived, sterile immunity against pre-erythrocytic stages of malaria. Malaria antigen (Ag)-specific CD8 T cells that produce IFN-gamma are key effector cells in this model of protection. Although there have been numerous reports dealing with gamma-spz-induced CD8 T cells in the spleen, CD8 T cells most likely confer protection by targeting infected hepatocytes. Consequently, in this chapter we discuss observations and hypotheses concerning CD8 T cell responses that occur in the liver after an encounter with the Plasmodium parasite. Protracted protection against pre-erythrocytic stages requires memory CD8 T cells and we discuss evidence that gamma-spz-induced immunity is indeed accompanied by the presence of intrahepatic CD44hi CD45RBlo CD62lo CD122lo effector memory (EM) CD8 T cells and CD44hi CD45RBhi CD621hi CD122hi central memory (CM) CD8 T cells. In addition, the EM CD8 T cells rapidly release IFN-gamma in response to spz challenge. The possible role of Kupffer cells in the processing of spz Ags and the production of cytokines is also considered. Finally, we discuss evidence that is consistent with a model whereby intrahepatic CM CD8 T cells are maintained by IL-15 mediated-homeostatic proliferation while the EM CD8 T cells are conscripted from the CM pool in response to a persisting depot of liver-stage Ag.
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Affiliation(s)
- U Krzych
- Department of Immunology, Division of Communicable Diseases and Immunology, Walter Reed Army Institute of Research, Silver Spring, MD 20910, USA.
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41
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Plebanski M, Hannan CM, Behboudi S, Flanagan KL, Apostolopoulos V, Sinden RE, Hill AVS. Direct processing and presentation of antigen from malaria sporozoites by professional antigen-presenting cells in the induction of CD8 T-cell responses. Immunol Cell Biol 2005; 83:307-12. [PMID: 15877610 DOI: 10.1111/j.1440-1711.2005.01325.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Irradiated malaria sporozoites induce better protection than viable untreated sporozoites. We observed early differences between irradiated and viable untreated sporozoites in priming responses in vivo to a protective CD8 T-cell epitope, pb9, of the circumsporozoite protein of Plasmodium berghei. Sporozoites were processed for MHC class I presentation by dendritic cells (DC) to prime pb9-specific IFN-gamma-producing CD8 T cells. DC pulsed with untreated and irradiated sporozoites were similarly capable of priming central memory T-cell responses, detectable by the IFN-gamma cultured ELISPOT assay. However, irradiation significantly enhanced sporozoites' ability to prime effector T-cell responses detectable by the IFN-gammaex vivo ELISPOT assay. Irradiation also enhanced the ability of splenic APC to process and present sporozoites in order to re-stimulate pb9-specific polyclonal and clonal T-cell responses. Sporozoites did not stimulate T cells in the absence of APC. Over-irradiation decreased the sporozoites' T-cell stimulating capacity in vitro at high parasite doses, which may indicate that an optimal irradiation dose is necessary to induce protective immunity by sporozoite inoculation. The induction of sporozoite-specific CD8 T-cell responses without the need for liver stage infection identifies a potentially important mechanism in the development of pre-erythrocytic immunity.
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Affiliation(s)
- Magdalena Plebanski
- Nuffield Department of Medicine, University of Oxford, John Radcliffe Hospital, UK.
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42
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Vukmanović S, Santori FR. Self-peptide/MHC and TCR antagonism: physiological role and therapeutic potential. Cell Immunol 2005; 233:75-84. [PMID: 15950208 DOI: 10.1016/j.cellimm.2005.04.011] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2005] [Accepted: 04/21/2005] [Indexed: 10/25/2022]
Abstract
TCR antagonists are peptides that bind MHC molecules and can specifically inhibit T cell activation induced by antigens. Studying TCR antagonism has taken an important place in immunology for both theoretical and practical reasons. Deciphering the mechanism(s) of action of TCR antagonists can yield important information about interactions of the TCR with ligands, T cell development, and TCR signaling. Moreover, microorganisms may employ TCR antagonism to elude the attention of the immune system. Finally, specificity of inhibition makes TCR antagonists an ideal tool to seek antigen-specific immunomodulation. Present state of knowledge on these topics is reviewed.
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Affiliation(s)
- Stanislav Vukmanović
- Center for Cancer and Immunology Research, Children's Research Institute, Children's National Medical Center, 111 Michigan Avenue NW, Washington, DC 20010-2970, USA.
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43
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Lau LL, Jiang J, Shen H. In Vivo Modulation of T Cell Responses and Protective Immunity by TCR Antagonism during Infection. THE JOURNAL OF IMMUNOLOGY 2005; 174:7970-6. [PMID: 15944303 DOI: 10.4049/jimmunol.174.12.7970] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Infectious agents are known to express altered peptide ligands that antagonize T cells in vitro; however, direct evidence of TCR antagonism during infection is still lacking, and its importance in the context of infection remains to be established. In this study, we used a murine model of infection with recombinant Listeria monocytogenes and addressed three issues that are critical for assessing the role of TCR antagonism in the modulation of the immune response. First, we demonstrated that the antagonist peptide efficiently inhibited the ability of the agonist to prime naive TCR-transgenic T cells in vivo. Second, we showed clonal memory T cells were antagonized during recall responses, resulting in loss of protective immunity. Lastly, we observed that even in the context of a polyclonal response, TCR antagonism greatly inhibits the agonist-specific response, leading to altered hierarchy of immunodominance and reduced T cell memory and protective immunity. These results provide direct evidence of clonal TCR antagonism of naive and memory CD8 T cells during infection and demonstrate the effect of TCR antagonism on protective immunity. Thus, agonist/antagonist interactions may play an important role in determining the immunodominance and repertoire of T cell targets, and evaluation of immune responses and vaccine strategies may require examination of not only agonists but also antagonists and their interactions during an infection.
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MESH Headings
- Animals
- Antigens, Viral/biosynthesis
- Antigens, Viral/genetics
- CD8-Positive T-Lymphocytes/immunology
- CD8-Positive T-Lymphocytes/metabolism
- CD8-Positive T-Lymphocytes/microbiology
- CD8-Positive T-Lymphocytes/virology
- Clone Cells
- Down-Regulation/genetics
- Down-Regulation/immunology
- Epitopes, T-Lymphocyte/immunology
- Epitopes, T-Lymphocyte/pharmacology
- Glycoproteins/agonists
- Glycoproteins/antagonists & inhibitors
- Glycoproteins/biosynthesis
- Glycoproteins/genetics
- Immunity, Innate/genetics
- Immunodominant Epitopes/immunology
- Immunodominant Epitopes/pharmacology
- Immunologic Memory/genetics
- Listeriosis/genetics
- Listeriosis/immunology
- Lymphocytic Choriomeningitis/genetics
- Lymphocytic Choriomeningitis/immunology
- Lymphocytic choriomeningitis virus/immunology
- Mice
- Mice, Inbred C57BL
- Mice, Knockout
- Mice, Transgenic
- Peptide Fragments/agonists
- Peptide Fragments/antagonists & inhibitors
- Peptide Fragments/biosynthesis
- Peptide Fragments/genetics
- Receptors, Antigen, T-Cell/genetics
- Receptors, Antigen, T-Cell/physiology
- Resting Phase, Cell Cycle/genetics
- Resting Phase, Cell Cycle/immunology
- Viral Proteins/agonists
- Viral Proteins/antagonists & inhibitors
- Viral Proteins/biosynthesis
- Viral Proteins/genetics
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Affiliation(s)
- Lisa L Lau
- Department of Microbiology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA
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44
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Kim SK, Boothroyd JC. Stage-Specific Expression of Surface Antigens byToxoplasma gondiias a Mechanism to Facilitate Parasite Persistence. THE JOURNAL OF IMMUNOLOGY 2005; 174:8038-48. [PMID: 15944311 DOI: 10.4049/jimmunol.174.12.8038] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Toxoplasma persists in the face of a functional immune system. This success critically depends on the ability of parasites to activate a strong adaptive immune response during acute infection with tachyzoites that eliminates most of the parasites and to undergo stage conversion to bradyzoites that encyst and persist predominantly in the brain. A dramatic change in antigenic composition occurs during stage conversion, such that tachyzoites and bradyzoites express closely related but antigenically distinct sets of surface Ags belonging to the surface Ag 1 (SAG1)-related sequence (SRS) family. To test the contribution of this antigenic switch to parasite persistence, we engineered parasites to constitutively express the normally bradyzoite-specific SRS9 (SRS9(c)) mutants and tachyzoite-specific SAG1 (SAG1(c)) mutants. SRS9(c) but not wild-type parasites elicited a SRS9-specific immune response marked by IFN-gamma production, suggesting that stage-specificity of SRS Ags determines their immunogenicity in infection. The induction of a SRS9-specific immune response correlated with a continual decrease in the number of SRS9(c) cysts persisting in the brain. In contrast, SAG1(c) mutants produced reduced brain cyst loads early in chronic infection, but these substantially increased over time accompanying a hyperproduction of IFN-gamma, TNF-alpha, and IL-10, and severe encephalitis. We conclude that stage-specific expression of SRS Ags is among the key mechanisms by which optimal parasite persistency is established and maintained.
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MESH Headings
- Animals
- Antigens, Protozoan/biosynthesis
- Antigens, Protozoan/genetics
- Antigens, Protozoan/physiology
- Antigens, Surface/biosynthesis
- Antigens, Surface/genetics
- Antigens, Surface/physiology
- Cells, Cultured
- Chronic Disease
- Cytokines/biosynthesis
- Female
- Host-Parasite Interactions/genetics
- Host-Parasite Interactions/immunology
- Interferon-gamma/biosynthesis
- Interleukin-10/biosynthesis
- Mice
- Mice, Inbred CBA
- Mutation
- Protozoan Proteins/biosynthesis
- Protozoan Proteins/genetics
- Protozoan Proteins/physiology
- Protozoan Vaccines/administration & dosage
- Protozoan Vaccines/genetics
- Protozoan Vaccines/immunology
- Spleen/immunology
- Spleen/metabolism
- Spleen/parasitology
- Toxoplasma/genetics
- Toxoplasma/growth & development
- Toxoplasma/immunology
- Toxoplasmosis, Animal/immunology
- Toxoplasmosis, Animal/mortality
- Toxoplasmosis, Animal/parasitology
- Toxoplasmosis, Animal/prevention & control
- Toxoplasmosis, Cerebral/immunology
- Toxoplasmosis, Cerebral/mortality
- Toxoplasmosis, Cerebral/parasitology
- Toxoplasmosis, Cerebral/prevention & control
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Affiliation(s)
- Seon-Kyeong Kim
- Department of Microbiology and Immunology, Stanford University School of Medicine, Stanford, CA 94305, USA
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45
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Scottà C, Tuosto L, Masci AM, Racioppi L, Piccolella E, Frasca L. Hypervariable region 1 variant acting as TCR antagonist affects hepatitis C virus-specific CD4+ T cell repertoire by favoring CD95-mediated apoptosis. J Leukoc Biol 2005; 78:372-82. [PMID: 15923217 DOI: 10.1189/jlb.0804456] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
We have described previously that hypervariable region 1 (HVR1) variants of hepatitis C virus (HCV) frequently act as T cell receptor (TCR) antagonists for HVR1-specific helper T cells. These naturally occurring HVR1-antagonistic sequences interfered with the effects of HVR1-agonistic sequences such as TCR down-regulation and early activatory signals. By taking advantage of these findings, in this paper, we have analyzed the fate of these HVR1-specific antagonized CD4+ T cells. We present the evidence that TCR antagonism renders agonist-activated T cells susceptible to bystander CD95-mediated killing by suppressing the expression of cellular Fas-associated death domain-like interleukin-1beta-converting enzyme-like inhibitor proteins. To verify whether the TCR repertoire of a HVR1-specific T cell population could be modified consequently, we used a HVR1-agonistic sequence to induce in vitro CD4+ T cells and another HVR1 sequence with antagonistic property to mediate suppressive phenomena. HVR1-specific T cells were cultured with the agonist alone or with the agonist plus the antagonist. HVR1 specificity and T cell repertoires were followed over time by analyzing TCR beta-variable gene segment by "spectratyping". The results showed that the specificity for the agonist was rapidly spoiled after culture in the presence of the antagonist, and the TCR repertoire was strongly modified as a result of CD95-mediated apoptosis of agonist-specific clonal expansions. These data support the hypothesis that in HCV infection, the generation of TCR antagonists may reshape the T cell repertoire, representing an efficacious immune evasion strategy of a highly mutant pathogen.
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MESH Headings
- Antigens, Viral/immunology
- Apoptosis/immunology
- CD4-Positive T-Lymphocytes/immunology
- Cell Proliferation
- Cells, Cultured
- Down-Regulation/immunology
- Epitopes, T-Lymphocyte
- Hepacivirus/immunology
- Hepacivirus/pathogenicity
- Humans
- Lymphocyte Activation/immunology
- Receptors, Antigen, T-Cell, alpha-beta/antagonists & inhibitors
- Receptors, Antigen, T-Cell, alpha-beta/genetics
- Receptors, Antigen, T-Cell, alpha-beta/immunology
- Serpins/biosynthesis
- Serpins/immunology
- T-Lymphocyte Subsets/immunology
- Viral Proteins/biosynthesis
- Viral Proteins/immunology
- fas Receptor/immunology
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Affiliation(s)
- Cristiano Scottà
- Department of Cellular and Developmental Biology, La Sapienza University, Rome, 00185, Italy
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46
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Turner SJ, Kedzierska K, Komodromou H, La Gruta NL, Dunstone MA, Webb AI, Webby R, Walden H, Xie W, McCluskey J, Purcell AW, Rossjohn J, Doherty PC. Lack of prominent peptide-major histocompatibility complex features limits repertoire diversity in virus-specific CD8+ T cell populations. Nat Immunol 2005; 6:382-9. [PMID: 15735650 DOI: 10.1038/ni1175] [Citation(s) in RCA: 121] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2004] [Accepted: 01/31/2005] [Indexed: 11/08/2022]
Abstract
Using both 'reverse genetics' and structural analysis, we have examined the in vivo relationship between antigenicity and T cell receptor (TCR) repertoire diversity. Influenza A virus infection of C57BL/6 mice induces profoundly different TCR repertoires specific for the nucleoprotein peptide of amino acids 366-374 (NP366) and the acid polymerase peptide of amino acids 224-233 (PA224) presented by H-2D(b). Here we show the H-2D(b)-NP366 complex with a 'featureless' structure selected a limited TCR repertoire characterized by 'public' TCR usage. In contrast, the prominent H-2D(b)-PA224 complex selected diverse, individually 'private' TCR repertoires. Substitution of the arginine at position 7 of PA224 with an alanine reduced the accessible side chains of the epitope. Infection with an engineered virus containing a mutation at the site encoding the exposed arginine at position 7 of PA224 selected a restricted TCR repertoire similar in diversity to that of the H-2D(b)-NP366-specific response. Thus, the lack of prominent features in an antigenic complex of peptide and major histocompatibility complex class I is associated with a diminished spectrum of TCR usage.
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Affiliation(s)
- Stephen J Turner
- Department of Microbiology and Immunology, The University of Melbourne, Parkville, Victoria 3010, Australia
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47
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Abstract
It is widely perceived that immunity to malaria is, to an extent, defective and that one component of this defective immune response is the inability to induce or maintain long-term memory responses. If true, this is likely to pose problems for development of an effective vaccine against malaria. In this article, we critically review and challenge this interpretation of the epidemiological and experimental evidence. While evasion and modulation of host immune responses clearly occurs and naturally acquired immunity is far from optimal, mechanisms to control blood-stage parasites are acquired and maintained by individuals living in endemic areas, allowing parasite density to be kept below the threshold for induction of acute disease. Furthermore, protective immunity to severe pathology is achieved relatively rapidly and is maintained in the absence of boosting by re-infection. Nevertheless, there are significant challenges to overcome. The need for multiple infections to acquire immunity means that young children remain at risk of infection for far too long. Persistent or frequent exposure to antigen seems to be required to maintain anti-parasite immunity (premunition). Lastly, pre-erythrocytic and sexual stages of the life cycle are poorly immunogenic, and there is little evidence of effective pre-erythrocytic or transmission-blocking immunity at the population level. While these problems might theoretically be due to defective immunological memory, we suggest alternative explanations. Moreover, we question the extent to which these problems are malaria-specific rather than generic (i.e. result from inherent limitations of the vertebrate immune system).
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Affiliation(s)
- Siske S Struik
- Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, London, UK
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48
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Haribhai D, Edwards B, Williams ML, Williams CB. Functional reprogramming of the primary immune response by T cell receptor antagonism. ACTA ACUST UNITED AC 2004; 200:1371-82. [PMID: 15557350 PMCID: PMC2211957 DOI: 10.1084/jem.20041226] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The T cell receptor must translate modest, quantitative differences in ligand binding kinetics into the qualitatively distinct signals used to determine cell fate. Here, we use mice that express an endogenous T cell receptor (TCR) antagonist and an adoptive transfer system to examine the influence of TCR signal quality on the development of effector function. We show that activation of antigen-specific T cells in the presence of an antagonist results in a functional reprogramming of the primary immune response, marked by altered T cell homing, a failure to develop effector function, and ultimately clonal elimination by apoptosis. Importantly, antagonism does not block cell division, implying that the signals promoting clonal expansion and effector differentiation are distinct.
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MESH Headings
- Adoptive Transfer
- Animals
- Antigens, CD/analysis
- Antigens, Differentiation, T-Lymphocyte/analysis
- Caspase 3
- Caspases/metabolism
- Clonal Deletion
- Enzyme Activation
- Immune Tolerance
- Immunization
- Immunologic Memory
- Intracellular Signaling Peptides and Proteins
- Lectins, C-Type
- Lymphocyte Activation
- Membrane Proteins/metabolism
- Mice
- Mice, Inbred AKR
- Mice, Transgenic
- Protein Tyrosine Phosphatase, Non-Receptor Type 6
- Protein Tyrosine Phosphatases/physiology
- Receptors, Antigen, T-Cell/antagonists & inhibitors
- Receptors, Antigen, T-Cell/metabolism
- Receptors, Antigen, T-Cell/physiology
- T-Lymphocytes/immunology
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Affiliation(s)
- Dipica Haribhai
- Department of Pediatrics, Medical College of Wisconsin, 8701 Watertown Plank Rd., Milwaukee, WI 53226, USA
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49
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Haag KL, Alves-Junior L, Zaha A, Ayala FJ. Contingent, non-neutral evolution in a multicellular parasite: natural selection and gene conversion in the Echinococcus granulosus antigen B gene family. Gene 2004; 333:157-67. [PMID: 15177691 DOI: 10.1016/j.gene.2004.02.027] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2004] [Revised: 02/04/2004] [Accepted: 02/12/2004] [Indexed: 11/24/2022]
Abstract
Recent studies have demonstrated that the Echinococcus granulosus antigen B (AgB) interferes with the intermediate hosts' immune response and is encoded by a multigene family. The number of members within the family is still uncertain, but there are several evidences of a large genetic variability. The E. granulosus AgB genomic sequences available in nucleotide databases can be grouped into four clades, corresponding to genes EgAgB1, EgAgB2, EgAgB3 and EgAgB4. In the present study, we use PCR amplifications followed by cloning and sequencing to evaluate the genetic variability for AgB isoforms. Two pairs of primers were independently used for PCR amplification. Both PCR reactions from each of three isolated protoscolex (larvae) were cloned in a plasmid vector and the plasmid inserts of 30 colonies from each cloning experiment were sequenced. Using phylogenetic tools, the 113 EgAgB clones are classified as follows: 25 are related to EgAgB1, 24 to EgAgB2, 9 to EgAgB3 and 39 to EgAgB4. The remaining 16 clones form a separate cluster, which we name EgAgB5, more closely related to EgAgB3 than to any of the other genes. Within each gene group, a number of variant sequences occur, which differ from one another by one or few nucleotides. One EgAgB3 clone has a premature stop codon (pseudogene) and an EgAgB2 clone lacks the region corresponding to the intron. The overall variation cannot be explained by differences among the asexual protoscoleces, or by experimental artifacts. Using Echinococcuss AgB genes from other species/strains as outgroups, neutrality is rejected for EgAgB2, and balancing selection is detected for EgAgB5, which also seems to be involved in gene conversion. We suggest that EgAgB1-EgAgB5 represent a family of contingency genes, that is, genes that are variably expressed, so that some but not others are expressed in each individual parasite. Contingency genes are common in parasitic protozoa and other microparasites, but the EgAgB family is the first set identified in a multicellular parasite.
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Affiliation(s)
- K L Haag
- Departamento de Genética, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil.
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50
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Pouniotis DS, Proudfoot O, Minigo G, Hanley JC, Plebanski M. A new boost for malaria vaccines. Trends Parasitol 2004; 20:157-60. [PMID: 15099550 DOI: 10.1016/j.pt.2004.01.013] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Dodie S Pouniotis
- Vaccine and Infectious Diseases Unit, The Austin Research Institute, Studley Road, Heidelberg, Victoria 3084, Australia
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