1
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Schwartz JC, Farrell CP, Freimanis G, Sewell AK, Phillips JD, Hammond JA. A genome assembly and transcriptome atlas of the inbred Babraham pig to illuminate porcine immunogenetic variation. Immunogenetics 2024:10.1007/s00251-024-01355-7. [PMID: 39294478 DOI: 10.1007/s00251-024-01355-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2024] [Accepted: 09/05/2024] [Indexed: 09/20/2024]
Abstract
The inbred Babraham pig serves as a valuable biomedical model for research due to its high level of homozygosity, including in the major histocompatibility complex (MHC) loci and likely other important immune-related gene complexes, which are generally highly diverse in outbred populations. As the ability to control for this diversity using inbred organisms is of great utility, we sought to improve this resource by generating a long-read whole genome assembly and transcriptome atlas of a Babraham pig. The genome was de novo assembled using PacBio long reads and error-corrected using Illumina short reads. Assembled contigs were then mapped to the porcine reference assembly, Sscrofa11.1, to generate chromosome-level scaffolds. The resulting TPI_Babraham_pig_v1 assembly is nearly as contiguous as Sscrofa11.1 with a contig N50 of 34.95 Mb and contig L50 of 23. The remaining sequence gaps are generally the result of poor assembly across large and highly repetitive regions such as the centromeres and tandemly duplicated gene families, including immune-related gene complexes, that often vary in gene content between haplotypes. We also further confirm homozygosity across the Babraham MHC and characterize the allele content and tissue expression of several other immune-related gene complexes, including the antibody and T cell receptor loci, the natural killer complex, and the leukocyte receptor complex. The Babraham pig genome assembly provides an alternate highly contiguous porcine genome assembly as a resource for the livestock genomics community. The assembly will also aid biomedical and veterinary research that utilizes this animal model such as when controlling for genetic variation is critical.
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Affiliation(s)
| | - Colin P Farrell
- Division of Hematology, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
- Department of Molecular, Cell and Developmental Biology, University of California Los Angeles, Los Angeles, CA, 90095, USA
| | | | - Andrew K Sewell
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, CF14 4XN, UK
| | - John D Phillips
- Division of Hematology, University of Utah School of Medicine, Salt Lake City, UT, 84112, USA
| | - John A Hammond
- The Pirbright Institute, Ash Road, Woking, GU24 0NF, UK.
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2
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Zuckermann FA, Grinkova YV, Husmann RJ, Pires-Alves M, Storms S, Chen WY, Sligar SG. An effective vaccine against influenza A virus based on the matrix protein 2 (M2). Vet Microbiol 2024; 298:110245. [PMID: 39293153 DOI: 10.1016/j.vetmic.2024.110245] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2024] [Revised: 07/14/2024] [Accepted: 08/30/2024] [Indexed: 09/20/2024]
Abstract
The ever-increasing antigenic diversity of the hemagglutinin (HA) of influenza A virus (IAV) poses a significant challenge for effective vaccine development. Notably, the matrix protein 2 (M2) is a highly conserved 97 amino acid long transmembrane tetrameric protein present in the envelope of IAV. More than 99 % of IAV strains circulating in American swine herds share the identical pandemic (pdm) isoform of M2, making it an ideal target antigen for a vaccine that could elicit broadly protective immunity. Here, using soluble nanoscale membrane assemblies termed nanodiscs (NDs), we designed this membrane mimetic nanostructures displaying full-length M2 in its natural transmembrane configuration (M2ND). Intramuscular (IM) immunization of swine with M2ND mixed with conventional emulsion adjuvant elicited M2-specific IgG antibodies in the serum that recognized influenza virions and M2-specific interferon-γ secreting cells present in the blood. Intranasal (IN) immunization with M2ND adjuvanted with a mycobacterial extract elicited M2-specific IgA in mucosal secretions that also recognized IAV. Immunization with an influenza whole inactivated virus (WIV) vaccine supplemented with a concurrent IM injection of M2ND mixed with an emulsion adjuvant increased the level of protective immunity afforded by the former against a challenge with an antigenically distinct H3N2 IAV, as exhibited by an enhanced elimination of virus from the lung. The lone IM administration of the M2ND vaccine mixed with an emulsion adjuvant provided measurable protection as evidenced by a >10-fold reduction or complete elimination of the challenge virus from the lung, but it did not diminish the viral load in nasal secretions nor the extent of pneumonia that ensued after the virus challenge. In contrast, an improved formulation of the M2ND vaccine that incorporated synthetic CpG oligodeoxynucleotides (CpG-ODN) in the nanostructures administered alone, via the IN and IM routes combined, provided a significant level of protective immunity against IAV as evidenced by a decreased viral load in both the upper and lower respiratory tracts and fully eliminated the occurrence of pneumonia in 89 % of the pigs immunized with this biologic. Notably, to be effective, the M2 protein must be displayed in the ND assemblies, as shown by the observation that simply mixing M2 with empty NDs incorporating CpG-ODN (eND-CpG-ODN) did not provide protective immunity. This novel M2-based vaccine offers great promise to help increase the breadth of protection afforded by conventional WIV vaccines against the diversity of IAV in circulation and, plausibly, as a broadly protective stand-alone biologic.
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Affiliation(s)
- Federico A Zuckermann
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL 61802, USA.
| | - Yelena V Grinkova
- Department of Biochemistry, 505 South Goodwin Avenue, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA
| | - Robert J Husmann
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL 61802, USA
| | - Melissa Pires-Alves
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL 61802, USA
| | - Suzanna Storms
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL 61802, USA
| | - Wei-Yu Chen
- Department of Pathobiology, College of Veterinary Medicine, University of Illinois Urbana-Champaign, Urbana, IL 61802, USA
| | - Stephen G Sligar
- Department of Biochemistry, 505 South Goodwin Avenue, University of Illinois Urbana-Champaign, Urbana, IL 61801, USA
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3
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Muir A, Paudyal B, Schmidt S, Sedaghat-Rostami E, Chakravarti S, Villanueva-Hernández S, Moffat K, Polo N, Angelopoulos N, Schmidt A, Tenbusch M, Freimanis G, Gerner W, Richard AC, Tchilian E. Single-cell analysis reveals lasting immunological consequences of influenza infection and respiratory immunization in the pig lung. PLoS Pathog 2024; 20:e1011910. [PMID: 39024231 PMCID: PMC11257366 DOI: 10.1371/journal.ppat.1011910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2023] [Accepted: 06/07/2024] [Indexed: 07/20/2024] Open
Abstract
The pig is a natural host for influenza viruses and integrally involved in virus evolution through interspecies transmissions between humans and swine. Swine have many physiological, anatomical, and immunological similarities to humans, and are an excellent model for human influenza. Here, we employed single cell RNA-sequencing (scRNA-seq) and flow cytometry to characterize the major leukocyte subsets in bronchoalveolar lavage (BAL), twenty-one days after H1N1pdm09 infection or respiratory immunization with an adenoviral vector vaccine expressing hemagglutinin and nucleoprotein with or without IL-1β. Mapping scRNA-seq clusters from BAL onto those previously described in peripheral blood facilitated annotation and highlighted differences between tissue resident and circulating immune cells. ScRNA-seq data and functional assays revealed lasting impacts of immune challenge on BAL populations. First, mucosal administration of IL-1β reduced the number of functionally active Treg cells. Second, influenza infection upregulated IFI6 in BAL cells and decreased their susceptibility to virus replication in vitro. Our data provide a reference map of porcine BAL cells and reveal lasting immunological consequences of influenza infection and respiratory immunization in a highly relevant large animal model for respiratory virus infection.
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Affiliation(s)
- Andrew Muir
- Immunology Programme, The Babraham Institute, Cambridge, United Kingdom
| | | | | | | | | | | | - Katy Moffat
- The Pirbright Institute, Pirbright, United Kingdom
| | - Noemi Polo
- The Pirbright Institute, Pirbright, United Kingdom
| | | | - Anna Schmidt
- Virologisches Institut-Klinische und Molekulare Virologie, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
- FAU Profilzentrum Immunmedizin (FAU I-MED), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Matthias Tenbusch
- Virologisches Institut-Klinische und Molekulare Virologie, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
- FAU Profilzentrum Immunmedizin (FAU I-MED), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
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4
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Kang HJ, Li J, Razzak MA, Eom GD, Yoon KW, Mao J, Chu KB, Jin H, Choi SS, Quan FS. Chitosan-Alginate Polymeric Nanocomposites as a Potential Oral Vaccine Carrier Against Influenza Virus Infection. ACS APPLIED MATERIALS & INTERFACES 2023. [PMID: 37903218 DOI: 10.1021/acsami.3c11756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/01/2023]
Abstract
Lessons from the recent COVID-19 pandemic underscore the importance of rapidly developing an efficacious vaccine and its immediate administration for prophylaxis. Oral vaccines are of particular interest, as the presence of healthcare professionals is not needed for this stress-free vaccination approach. In this study, we designed a chitosan (CH)-alginate (AL) complex carrier system encapsulating an inactivated influenza virus vaccine (A/PR/8/34, H1N1), and the efficacy of these orally administered nanocomposite vaccines was evaluated in mice. Interestingly, CH-AL complexes were able to load large doses of vaccine (≥90%) with a stable dispersion. The encapsulated vaccine was protected from gastric acid and successfully released from the nanocomposite upon exposure to conditions resembling those of the small intestines. Scanning electron microscopy of the CH-virus-AL complexes revealed that the connections between the lumps became loose and widened pores were visible on the nanocomposite's surface at pH 7.4, thereby increasing the chance of virus release into the surroundings. Orally inoculating CH-virus-AL into mice elicited higher virus-specific IgG compared to the unimmunized controls. CH-virus-AL immunization also enhanced CD4 and CD8 T cell responses while diminishing lung virus titer, inflammatory cytokine production, and body weight loss compared to the infection control group. These results suggest that chitosan-alginate polymeric nanocomposites could be promising delivery complexes for oral influenza vaccines.
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Affiliation(s)
- Hae-Ji Kang
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jiaoyang Li
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea
- The Natural Science Research Institute, Myongji University, Yongin 17058, Republic of Korea
| | - Md Abdur Razzak
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea
- The Natural Science Research Institute, Myongji University, Yongin 17058, Republic of Korea
| | - Gi-Deok Eom
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Keon-Woong Yoon
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Jie Mao
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Ki-Back Chu
- Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
- Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
| | - Hui Jin
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea
| | - Shin Sik Choi
- Department of Energy Science and Technology, Myongji University, Yongin 17058, Republic of Korea
- The Natural Science Research Institute, Myongji University, Yongin 17058, Republic of Korea
- Department of Food and Nutrition, Myongji University, Yongin 17058, Republic of Korea
- elegslab Inc., Seoul 06083, Republic of Korea
| | - Fu-Shi Quan
- Department of Medical Zoology, School of Medicine, Kyung Hee University, Seoul 02447, Republic of Korea
- Medical Research Center for Bioreaction to Reactive Oxygen Species and Biomedical Science Institute, School of Medicine, Graduate School, Kyung Hee University, Seoul 02447, Republic of Korea
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5
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Schmidt A, Paudyal B, Villanueva-Hernández S, Mcnee A, Vatzia E, Carr BV, Schmidt S, Mccarron A, Martini V, Schroedel S, Thirion C, Waters R, Salguero FJ, Gerner W, Tenbusch M, Tchilian E. Effect of mucosal adjuvant IL-1β on heterotypic immunity in a pig influenza model. Front Immunol 2023; 14:1181716. [PMID: 37153548 PMCID: PMC10159270 DOI: 10.3389/fimmu.2023.1181716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 03/31/2023] [Indexed: 05/09/2023] Open
Abstract
T cell responses directed against highly conserved viral proteins contribute to the clearance of the influenza virus and confer broadly cross-reactive and protective immune responses against a range of influenza viruses in mice and ferrets. We examined the protective efficacy of mucosal delivery of adenoviral vectors expressing hemagglutinin (HA) and nucleoprotein (NP) from the H1N1 virus against heterologous H3N2 challenge in pigs. We also evaluated the effect of mucosal co-delivery of IL-1β, which significantly increased antibody and T cell responses in inbred Babraham pigs. Another group of outbred pigs was first exposed to pH1N1 as an alternative means of inducing heterosubtypic immunity and were subsequently challenged with H3N2. Although both prior infection and adenoviral vector immunization induced strong T-cell responses against the conserved NP protein, none of the treatment groups demonstrated increased protection against the heterologous H3N2 challenge. Ad-HA/NP+Ad-IL-1β immunization increased lung pathology, although viral load was unchanged. These data indicate that heterotypic immunity may be difficult to achieve in pigs and the immunological mechanisms may differ from those in small animal models. Caution should be applied in extrapolating from a single model to humans.
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Affiliation(s)
- Anna Schmidt
- Virologisches Institut-Klinische und Molekulare Virologie, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Basudev Paudyal
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | | | - Adam Mcnee
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Eleni Vatzia
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | | | - Selma Schmidt
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Amy Mccarron
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | | | | | | | - Ryan Waters
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | | | - Wilhelm Gerner
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Matthias Tenbusch
- Virologisches Institut-Klinische und Molekulare Virologie, Universitätsklinikum Erlangen, Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
- Medical Immunology Campus Erlangen (MICE), Friedrich-Alexander-Universität (FAU) Erlangen-Nürnberg, Erlangen, Germany
| | - Elma Tchilian
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
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6
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Vatzia E, Feest K, McNee A, Manjegowda T, Carr BV, Paudyal B, Chrun T, Maze EA, Mccarron A, Morris S, Everett HE, MacLoughlin R, Salguero FJ, Lambe T, Gilbert SC, Tchilian E. Immunization with matrix-, nucleoprotein and neuraminidase protects against H3N2 influenza challenge in pH1N1 pre-exposed pigs. NPJ Vaccines 2023; 8:19. [PMID: 36792640 PMCID: PMC9930017 DOI: 10.1038/s41541-023-00620-2] [Citation(s) in RCA: 11] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Accepted: 01/30/2023] [Indexed: 02/17/2023] Open
Abstract
There is an urgent need for influenza vaccines providing broader protection that may decrease the need for annual immunization of the human population. We investigated the efficacy of heterologous prime boost immunization with chimpanzee adenovirus (ChAdOx2) and modified vaccinia Ankara (MVA) vectored vaccines, expressing conserved influenza virus nucleoprotein (NP), matrix protein 1 (M1) and neuraminidase (NA) in H1N1pdm09 pre-exposed pigs. We compared the efficacy of intra-nasal, aerosol and intra-muscular vaccine delivery against H3N2 influenza challenge. Aerosol prime boost immunization induced strong local lung T cell and antibody responses and abrogated viral shedding and lung pathology following H3N2 challenge. In contrast, intramuscular immunization induced powerful systemic responses and weak local lung responses but also abolished lung pathology and reduced viral shedding. These results provide valuable insights into the development of a broadly protective influenza vaccine in a highly relevant large animal model and will inform future vaccine and clinical trial design.
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Affiliation(s)
- Eleni Vatzia
- The Pirbright Institute, Pirbright, United Kingdom.
| | | | - Adam McNee
- The Pirbright Institute, Pirbright, United Kingdom
| | | | | | | | | | | | - Amy Mccarron
- The Pirbright Institute, Pirbright, United Kingdom
| | - Susan Morris
- Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - Helen E Everett
- Animal and Plant Health Agency-Weybridge, New Haw, Addlestone, United Kingdom
| | | | - Francisco J Salguero
- United Kingdom Health Security Agency, UKHSA-Porton Down, Salisbury, United Kingdom
| | - Teresa Lambe
- Oxford Vaccine Group, Department of Paediatrics, Medical Sciences Division, University of Oxford and Chinese Academy of Medical Science (CAMS) Oxford Institute (COI), University of Oxford, Oxford, United Kingdom
| | - Sarah C Gilbert
- Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom
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7
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Martini V, Edmans M, Gubbins S, Jayaraman S, Paudyal B, Morgan S, McNee A, Morin T, Rijal P, Gerner W, Sewell AK, Inoue R, Bailey M, Connelley T, Charleston B, Townsend A, Beverley P, Tchilian E. Spatial, temporal and molecular dynamics of swine influenza virus-specific CD8 tissue resident memory T cells. Mucosal Immunol 2022; 15:428-442. [PMID: 35145208 PMCID: PMC9038527 DOI: 10.1038/s41385-021-00478-4] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Revised: 11/23/2021] [Accepted: 12/08/2021] [Indexed: 02/04/2023]
Abstract
For the first time we have defined naïve, central memory, effector memory and differentiated effector porcine CD8 T cells and analyzed their distribution in lymphoid and respiratory tissues after influenza infection or immunization, using peptide-MHC tetramers of three influenza nucleoprotein (NP) epitopes. The hierarchy of response to the three epitopes changes during the response in different tissues. Most NP-specific CD8 T cells in broncho-alveolar lavage (BAL) and lung are tissue resident memory cells (TRM) that express CD69 and downregulate CD45RA and CCR7. NP-specific cells isolated from BAL express genes characteristic of TRM, but gene expression differs at 7, 21 and 63 days post infection. In all tissues the frequency of NP-specific CD8 cells declines over 63 days almost to background levels but is best maintained in BAL. The kinetic of influenza specific memory CD8 T cell in this natural host species differs from that in small animal models.
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Affiliation(s)
- Veronica Martini
- The Pirbright Institute, Pirbright, UK.
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK.
- Institute for Research in Biomedicine, Bellinzona, Switzerland.
| | | | | | | | | | | | | | - Théo Morin
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK
| | - Pramila Rijal
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | | | - Andrew K Sewell
- Division of Infection and Immunity, Cardiff University School of Medicine, Cardiff, UK
| | - Ryo Inoue
- Laboratory of Animal Science, Setsunan University, Osaka, Japan
| | - Mick Bailey
- Bristol Veterinary School, University of Bristol, Langford, UK
| | | | | | - Alain Townsend
- Weatherall Institute of Molecular Medicine, University of Oxford, Oxford, UK
| | - Peter Beverley
- National Heart and Lung Institute, St Mary's Campus, Imperial College, London, UK
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8
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Paudyal B, McNee A, Rijal P, Carr BV, Nunez A, McCauley J, Daniels RS, Townsend AR, Hammond JA, Tchilian E. Low Dose Pig Anti-Influenza Virus Monoclonal Antibodies Reduce Lung Pathology but Do Not Prevent Virus Shedding. Front Immunol 2022; 12:790918. [PMID: 34975888 PMCID: PMC8716435 DOI: 10.3389/fimmu.2021.790918] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/18/2021] [Indexed: 01/24/2023] Open
Abstract
We have established the pig, a large natural host animal for influenza, with many physiological similarities to humans, as a robust model for testing the therapeutic potential of monoclonal antibodies (mAbs). In this study we demonstrated that prophylactic intravenous administration of 15 mg/kg of porcine mAb pb18, against the K160-163 site of the hemagglutinin, significantly reduced lung pathology and nasal virus shedding and eliminated virus from the lung of pigs following H1N1pdm09 challenge. When given at 1 mg/kg, pb18 significantly reduced lung pathology and lung and BAL virus loads, but not nasal shedding. Similarly, when pb18 was given in combination with pb27, which recognized the K130 site, at 1 mg/kg each, lung virus load and pathology were reduced, although without an apparent additive or synergistic effect. No evidence for mAb driven virus evolution was detected. These data indicate that intravenous administration of high doses was required to reduce nasal virus shedding, although this was inconsistent and seldom complete. In contrast, the effect on lung pathology and lung virus load is consistent and is also seen at a one log lower dose, strongly indicating that a lower dose might be sufficient to reduce severity of disease, but for prevention of transmission other measures would be needed.
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Affiliation(s)
- Basudev Paudyal
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Adam McNee
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Pramila Rijal
- Centre for Translational Immunology, Chinese Academy of Medical Sciences Oxford Institute, University of Oxford, Oxford, United Kingdom.,Medical Research and Council (MRC) Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - B Veronica Carr
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Alejandro Nunez
- Department of Pathology and Animal Sciences, Animal and Plant Health Agency-Weybridge, Addlestone, United Kingdom
| | - John McCauley
- Worldwide Influenza Centre, The Francis Crick Institute, London, United Kingdom
| | - Rodney S Daniels
- Worldwide Influenza Centre, The Francis Crick Institute, London, United Kingdom
| | - Alain R Townsend
- Centre for Translational Immunology, Chinese Academy of Medical Sciences Oxford Institute, University of Oxford, Oxford, United Kingdom.,Medical Research and Council (MRC) Human Immunology Unit, MRC Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - John A Hammond
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Elma Tchilian
- Host Responses, The Pirbright Institute, Pirbright, United Kingdom
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9
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Paudyal B, Mwangi W, Rijal P, Schwartz JC, Noble A, Shaw A, Sealy JE, Bonnet-Di Placido M, Graham SP, Townsend A, Hammond JA, Tchilian E. Fc-Mediated Functions of Porcine IgG Subclasses. Front Immunol 2022; 13:903755. [PMID: 35757698 PMCID: PMC9218351 DOI: 10.3389/fimmu.2022.903755] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2022] [Accepted: 04/29/2022] [Indexed: 11/13/2022] Open
Abstract
The pig is an important agricultural species and powerful biomedical model. We have established the pig, a large natural host animal for influenza with many physiological similarities to humans, as a robust model for testing the therapeutic potential of monoclonal antibodies. Antibodies provide protection through neutralization and recruitment of innate effector functions through the Fc domain. However very little is known about the Fc-mediated functions of porcine IgG subclasses. We have generated 8 subclasses of two porcine monoclonal anti influenza hemagglutinin antibodies. We characterized their ability to activate complement, trigger cytotoxicity and phagocytosis by immune cells and assayed their binding to monocytes, macrophages, and natural killer cells. We show that IgG1, IgG2a, IgG2b, IgG2c and IgG4 bind well to targeted cell types and mediate complement mediated cellular cytotoxicity (CDCC), antibody dependent cellular cytotoxicity (ADCC) and antibody mediated cell phagocytosis (ADCP). IgG5b and IgG5c exhibited weak binding and variable and poor functional activity. Immune complexes of porcine IgG3 did not show any Fc-mediated functions except for binding to monocytes and macrophages and weak binding to NK cells. Interestingly, functionally similar porcine IgG subclasses clustered together in the genome. These novel findings will enhance the utility of the pig model for investigation of therapeutic antibodies.
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Affiliation(s)
- Basudev Paudyal
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - William Mwangi
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Pramila Rijal
- Medical Research Council (MRC) Human Immunology Unit, Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - John C Schwartz
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Alistair Noble
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Andrew Shaw
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Joshua E Sealy
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | | | - Simon P Graham
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Alain Townsend
- Medical Research Council (MRC) Human Immunology Unit, Weatherall Institute of Molecular Medicine, Radcliffe Department of Medicine, University of Oxford, Oxford, United Kingdom
| | - John A Hammond
- Host Responses, The Pirbright Institute, Woking, United Kingdom
| | - Elma Tchilian
- Host Responses, The Pirbright Institute, Woking, United Kingdom
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10
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Keep S, Carr BV, Lean FZX, Fones A, Newman J, Dowgier G, Freimanis G, Vatzia E, Polo N, Everest H, Webb I, Mcnee A, Paudyal B, Thakur N, Nunez A, MacLoughlin R, Maier H, Hammond J, Bailey D, Waters R, Charleston B, Tuthill T, Britton P, Bickerton E, Tchilian E. Porcine Respiratory Coronavirus as a Model for Acute Respiratory Coronavirus Disease. Front Immunol 2022; 13:867707. [PMID: 35418984 PMCID: PMC8995773 DOI: 10.3389/fimmu.2022.867707] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2022] [Accepted: 03/02/2022] [Indexed: 12/11/2022] Open
Abstract
In the light of the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic, we have developed a porcine respiratory coronavirus (PRCV) model for in depth mechanistic evaluation of the pathogenesis, virology and immune responses of this important family of viruses. Pigs are a large animal with similar physiology and immunology to humans and are a natural host for PRCV. Four PRCV strains were investigated and shown to induce different degrees of lung pathology. Importantly, although all four strains replicated equally well in porcine cell lines in vitro and in the upper respiratory tract in vivo, PRCV strains causing more severe lung pathology were also able to replicate in ex vivo tracheal organ cultures as well as in vivo in the trachea and lung. The time course of infection of PRCV 135, which caused the most severe pulmonary pathology, was investigated. Virus was shed from the upper respiratory tract until day 10 post infection, with infection of the respiratory mucosa, as well as olfactory and sustentacular cells, providing an excellent model to study upper respiratory tract disease in addition to the commonly known lower respiratory tract disease from PRCV. Infected animals made antibody and T cell responses that cross reacted with the four PRCV strains and Transmissible Gastroenteritis Virus. The antibody response was reproduced in vitro in organ cultures. Comparison of mechanisms of infection and immune control in pigs infected with PRCVs of differing pathogenicity with human data from SARS-CoV-2 infection and from our in vitro organ cultures, will enable key events in coronavirus infection and disease pathogenesis to be identified.
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Affiliation(s)
- Sarah Keep
- The Pirbright Institute, Pirbright, United Kingdom
| | | | - Fabian Z X Lean
- Department of Pathology, Animal and Plant Health Agency, Addlestone, United Kingdom
| | - Albert Fones
- The Pirbright Institute, Pirbright, United Kingdom
| | | | | | | | - Eleni Vatzia
- The Pirbright Institute, Pirbright, United Kingdom
| | - Noemi Polo
- The Pirbright Institute, Pirbright, United Kingdom
| | | | - Isobel Webb
- The Pirbright Institute, Pirbright, United Kingdom
| | - Adam Mcnee
- The Pirbright Institute, Pirbright, United Kingdom
| | - Basu Paudyal
- The Pirbright Institute, Pirbright, United Kingdom
| | - Nazia Thakur
- The Pirbright Institute, Pirbright, United Kingdom
| | - Alejandro Nunez
- Department of Pathology, Animal and Plant Health Agency, Addlestone, United Kingdom
| | - Ronan MacLoughlin
- Research and Development, Science and Emerging Technologies, Aerogen, Galway, Ireland
| | - Helena Maier
- The Pirbright Institute, Pirbright, United Kingdom
| | - John Hammond
- The Pirbright Institute, Pirbright, United Kingdom
| | - Dalan Bailey
- The Pirbright Institute, Pirbright, United Kingdom
| | - Ryan Waters
- The Pirbright Institute, Pirbright, United Kingdom
| | | | - Toby Tuthill
- The Pirbright Institute, Pirbright, United Kingdom
| | - Paul Britton
- The Pirbright Institute, Pirbright, United Kingdom
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11
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Combinatorial Viral Vector-Based and Live Attenuated Vaccines without an Adjuvant to Generate Broader Immune Responses to Effectively Combat Pneumonic Plague. mBio 2021; 12:e0322321. [PMID: 34872353 PMCID: PMC8649767 DOI: 10.1128/mbio.03223-21] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
Mice immunized with a combination of an adenovirus vector (Ad5-YFV) and live-attenuated (LMA)-based vaccines were evaluated for protective efficacy against pneumonic plague. While the Ad5-YFV vaccine harbors a fusion cassette of three genes encoding YscF, F1, and LcrV, LMA represents a mutant of parental Yersinia pestis CO92 deleted for genes encoding Lpp, MsbB, and Ail. Ad5-YFV and LMA were either administered simultaneously (1-dose regimen) or 21 days apart in various orders and route of administration combinations (2-dose regimen). The 2-dose regimen induced robust immune responses to provide full protection to animals against parental CO92 and its isogenic F1 deletion mutant (CAF−) challenges during both short- and long-term studies. Mice intranasally (i.n.) immunized with Ad5-YFV first followed by LMA (i.n. or intramuscularly [i.m.]) had higher T- and B-cell proliferative responses and LcrV antibody titers than those in mice vaccinated with LMA (i.n. or i.m.) first ahead of Ad5-YFV (i.n.) during the long-term study. Specifically, the needle- and adjuvant-free vaccine combination (i.n.) is ideal for use in plague regions of endemicity. Conversely, with a 1-dose regimen, mice vaccinated with Ad5-YFV i.n. and LMA by the i.m. route provided complete protection to animals against CO92 and its CAF− mutant challenges and elicited Th1/Th2, as well as Th17 responses, making it suitable for emergency vaccination during a plague outbreak or bioterrorist attack. This is a first study in which a viral vector-based and live-attenuated vaccines were effectively used in combination, representing adjuvant- and/or needle-free immunization, with each vaccine triggering a distinct cellular immune response.
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12
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Chrun T, Maze EA, Vatzia E, Martini V, Paudyal B, Edmans MD, McNee A, Manjegowda T, Salguero FJ, Wanasen N, Koonpaew S, Graham SP, Tchilian E. Simultaneous Infection With Porcine Reproductive and Respiratory Syndrome and Influenza Viruses Abrogates Clinical Protection Induced by Live Attenuated Porcine Reproductive and Respiratory Syndrome Vaccination. Front Immunol 2021; 12:758368. [PMID: 34858411 PMCID: PMC8632230 DOI: 10.3389/fimmu.2021.758368] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2021] [Accepted: 10/21/2021] [Indexed: 11/30/2022] Open
Abstract
The porcine respiratory disease complex (PRDC) is responsible for significant economic losses in the pig industry worldwide. Porcine reproductive and respiratory syndrome virus (PRRSV) and swine influenza virus are major viral contributors to PRDC. Vaccines are cost-effective measures for controlling PRRS, however, their efficacy in the context of co-infections has been poorly investigated. In this study, we aimed to determine the effect of PRRSV-2 and swine influenza H3N2 virus co-infection on the efficacy of PRRSV modified live virus (MLV) vaccination, which is widely used in the field. Following simultaneous challenge with contemporary PRRSV-2 and H3N2 field isolates, we found that the protective effect of PRRS MLV vaccination on clinical disease and pathology was abrogated, although viral load was unaffected and antibody responses were enhanced. In contrast, co-infection in non-immunized animals reduced PRRSV-2 viremia and H3N2 virus load in the upper respiratory tract and potentiated T cell responses against both PRRSV-2 and H3N2 in the lung. Further analysis suggested that an upregulation of inhibitory cytokines gene expression in the lungs of vaccinated pigs may have influenced responses to H3N2 and PRRSV-2. These findings provide important insights into the effect of viral co-infections on PRRS vaccine efficacy that may help identify more effective vaccination strategies against PRDC in the field.
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Affiliation(s)
| | | | | | | | | | | | - Adam McNee
- The Pirbright Institute, Woking, United Kingdom
| | | | | | - Nanchaya Wanasen
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency, Pathumthani, Thailand
| | - Surapong Koonpaew
- Virology and Cell Technology Laboratory, National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency, Pathumthani, Thailand
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13
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Vatzia E, Allen ER, Manjegowda T, Morris S, McNee A, Martini V, Kaliath R, Ulaszewska M, Boyd A, Paudyal B, Carr VB, Chrun T, Maze E, MacLoughlin R, van Diemen PM, Everett HE, Lambe T, Gilbert SC, Tchilian E. Respiratory and Intramuscular Immunization With ChAdOx2-NPM1-NA Induces Distinct Immune Responses in H1N1pdm09 Pre-Exposed Pigs. Front Immunol 2021; 12:763912. [PMID: 34804053 PMCID: PMC8595216 DOI: 10.3389/fimmu.2021.763912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2021] [Accepted: 10/13/2021] [Indexed: 01/12/2023] Open
Abstract
There is a critical need to develop superior influenza vaccines that provide broader protection. Influenza vaccines are traditionally tested in naive animals, although humans are exposed to influenza in the first years of their lives, but the impact of prior influenza exposure on vaccine immune responses has not been well studied. Pigs are an important natural host for influenza, are a source of pandemic viruses, and are an excellent model for human influenza. Here, we investigated the immunogenicity of the ChAdOx2 viral vectored vaccine, expressing influenza nucleoprotein, matrix protein 1, and neuraminidase in H1N1pdm09 pre-exposed pigs. We evaluated the importance of the route of administration by comparing intranasal, aerosol, and intramuscular immunizations. Aerosol delivery boosted the local lung T-cell and antibody responses, while intramuscular immunization boosted peripheral blood immunity. These results will inform how best to deliver vaccines in order to harness optimal protective immunity.
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Affiliation(s)
- Eleni Vatzia
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Elizabeth R Allen
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Tanuja Manjegowda
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Susan Morris
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Adam McNee
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Veronica Martini
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Reshma Kaliath
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Marta Ulaszewska
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Amy Boyd
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Basudev Paudyal
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Veronica B Carr
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Tiphany Chrun
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | - Emmanuel Maze
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
| | | | | | - Helen E Everett
- Animal and Plant Health Agency (APHA)-Weybridge, Addlestone, United Kingdom
| | - Teresa Lambe
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Sarah C Gilbert
- Nuffield Department of Medicine, The Jenner Institute, University of Oxford, Oxford, United Kingdom
| | - Elma Tchilian
- Enhanced Host Responses, The Pirbright Institute, Pirbright, United Kingdom
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14
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Gerner W, Mair KH, Schmidt S. Local and Systemic T Cell Immunity in Fighting Pig Viral and Bacterial Infections. Annu Rev Anim Biosci 2021; 10:349-372. [PMID: 34724393 DOI: 10.1146/annurev-animal-013120-044226] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
T cells are an essential component of the adaptive immune system. Over the last 15 years, a constantly growing toolbox with which to study T cell biology in pigs has allowed detailed investigations on these cells in various viral and bacterial infections. This review provides an overview on porcine CD4, CD8, and γδ T cells and the current knowledge on the differentiation of these cells following antigen encounter. Where available, the responses of these cells to viral infections like porcine reproductive and respiratory syndrome virus, classical swine fever virus, swine influenza A virus, and African swine fever virus are outlined. In addition, knowledge on the porcine T cell response to bacterial infections like Actinobacillus pleuropneumoniae and Salmonella Typhimurium is reviewed. For CD4 T cells, the response to the outlined infections is reflected toward the Th1/Th2/Th17/Tfh/Treg paradigm for functional differentiation. Expected final online publication date for the Annual Review of Animal Biosciences, Volume 10 is February 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Wilhelm Gerner
- The Pirbright Institute, Pirbright, Woking, United Kingdom; ,
| | - Kerstin H Mair
- Christian Doppler Laboratory for Optimized Prediction of Vaccination Success in Pigs, Institute of Immunology, Department of Pathobiology, University of Veterinary Medicine Vienna, Vienna, Austria; .,Institute of Immunology, Department of Pathobiology, University of Veterinary Medicine Vienna, Austria
| | - Selma Schmidt
- The Pirbright Institute, Pirbright, Woking, United Kingdom; ,
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15
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Heida R, Hinrichs WL, Frijlink HW. Inhaled vaccine delivery in the combat against respiratory viruses: a 2021 overview of recent developments and implications for COVID-19. Expert Rev Vaccines 2021; 21:957-974. [PMID: 33749491 DOI: 10.1080/14760584.2021.1903878] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
INTRODUCTION As underlined by the late 2019 outbreak of severe acute respiratory syndrome-coronavirus-2 (SARS-CoV-2), vaccination remains the cornerstone of global health-care. Although vaccines for SARS-CoV-2 are being developed at a record-breaking pace, the majority of those that are licensed or currently registered in clinical trials are formulated as an injectable product, requiring a tightly regulated cold-chain infrastructure, and primarily inducing systemic immune responses. AREAS COVERED Here, we shed light on the status of inhaled vaccines against viral pathogens, providing background to the role of the mucosal immune system and elucidating what factors determine an inhalable vaccine's efficacy. We also discuss whether the development of an inhalable powder vaccine formulation against SARS-CoV-2 could be feasible. The review was conducted using relevant studies from PubMed, Web of Science and Google Scholar. EXPERT OPINION We believe that the scope of vaccine research should be broadened toward inhalable dry powder formulations since dry vaccines bear several advantages. Firstly, their dry state can tremendously increase vaccine stability and shelf-life. Secondly, they can be inhaled using disposable inhalers, omitting the need for trained health-care personnel and, therefore, facilitating mass-vaccination campaigns. Thirdly, inhalable vaccines may provide improved protection since they can induce an IgA-mediated mucosal immune response.
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Affiliation(s)
- Rick Heida
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Groningen, The Netherlands
| | - Wouter Lj Hinrichs
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Groningen, The Netherlands
| | - Henderik W Frijlink
- Department of Pharmaceutical Technology and Biopharmacy, University of Groningen, Groningen, The Netherlands
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16
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Käser T. Swine as biomedical animal model for T-cell research-Success and potential for transmittable and non-transmittable human diseases. Mol Immunol 2021; 135:95-115. [PMID: 33873098 DOI: 10.1016/j.molimm.2021.04.004] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2021] [Revised: 03/23/2021] [Accepted: 04/01/2021] [Indexed: 02/07/2023]
Abstract
Swine is biologically one of the most relevant large animal models for biomedical research. With its use as food animal that can be exploited as a free cell and tissue source for research and its high susceptibility to human diseases, swine additionally represent an excellent option for both the 3R principle and One Health research. One of the previously most limiting factors of the pig model was its arguably limited immunological toolbox. Yet, in the last decade, this toolbox has vastly improved including the ability to study porcine T-cells. This review summarizes the swine model for biomedical research with focus on T cells. It first contrasts the swine model to the more commonly used mouse and non-human primate model before describing the current capabilities to characterize and extend our knowledge on porcine T cells. Thereafter, it not only reflects on previous biomedical T-cell research but also extends into areas in which more in-depth T-cell analyses could strongly benefit biomedical research. While the former should inform on the successes of biomedical T-cell research in swine, the latter shall inspire swine T-cell researchers to find collaborations with researchers working in other areas - such as nutrition, allergy, cancer, transplantation, infectious diseases, or vaccine development.
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Affiliation(s)
- Tobias Käser
- Department of Population Health and Pathobiology, College of Veterinary Medicine, North Carolina State University, 1060 William Moore Drive, 27607 Raleigh, NC, USA.
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17
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Welner S, Ruggli N, Liniger M, Summerfield A, Larsen LE, Jungersen G. Reduced Virus Load in Lungs of Pigs Challenged with Porcine Reproductive and Respiratory Syndrome Virus after Vaccination with Virus Replicon Particles Encoding Conserved PRRSV Cytotoxic T-Cell Epitopes. Vaccines (Basel) 2021; 9:vaccines9030208. [PMID: 33801369 PMCID: PMC8000205 DOI: 10.3390/vaccines9030208] [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: 01/18/2021] [Revised: 02/25/2021] [Accepted: 02/25/2021] [Indexed: 11/16/2022] Open
Abstract
Porcine reproductive and respiratory syndrome virus (PRRSV) causes severe respiratory distress and reproductive failure in swine. Modified live virus (MLV) vaccines provide the highest degree of protection and are most often the preferred choice. While somewhat protective, the use of MLVs is accompanied by multiple safety issues, why safer alternatives are urgently needed. Here, we describe the generation of virus replicon particles (VRPs) based on a classical swine fever virus genome incapable of producing infectious progeny and designed to express conserved PRRSV-2 cytotoxic T-cell epitopes. Eighteen pigs matched with the epitopes by their swine leucocyte antigen-profiles were vaccinated (N = 11, test group) or sham-vaccinated (N = 7, control group) with the VRPs and subsequently challenged with PRRSV-2. The responses to vaccination and challenge were monitored using serological, immunological, and virological analyses. Challenge virus load in serum did not differ significantly between the groups, whereas the virus load in the caudal part of the lung was significantly lower in the test group compared to the control group. The number of peptide-induced interferon-γ secreting cells after challenge was higher and more frequent in the test group than in the control group. Together, our results provide indications of a shapeable PRRSV-specific cell-mediated immune response that may inspire future development of effective PRRSV vaccines.
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Affiliation(s)
- Simon Welner
- Section for Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, Dyrlægevej 88, 1870 Frederiksberg C, Denmark;
- Correspondence:
| | - Nicolas Ruggli
- Institute of Virology and Immunology IVI, Sensemattstrasse 293, 3147 Mittelhäusern, Switzerland; (N.R.); (M.L.); (A.S.)
- Department of Infectious Diseases and Pathobiology (DIP), Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland
| | - Matthias Liniger
- Institute of Virology and Immunology IVI, Sensemattstrasse 293, 3147 Mittelhäusern, Switzerland; (N.R.); (M.L.); (A.S.)
- Department of Infectious Diseases and Pathobiology (DIP), Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland
| | - Artur Summerfield
- Institute of Virology and Immunology IVI, Sensemattstrasse 293, 3147 Mittelhäusern, Switzerland; (N.R.); (M.L.); (A.S.)
- Department of Infectious Diseases and Pathobiology (DIP), Vetsuisse Faculty, University of Bern, Länggassstrasse 120, 3012 Bern, Switzerland
| | - Lars Erik Larsen
- Section for Veterinary Clinical Microbiology, Department of Veterinary and Animal Sciences, University of Copenhagen, Dyrlægevej 88, 1870 Frederiksberg C, Denmark;
| | - Gregers Jungersen
- Center for Vaccine Research, Statens Serum Institut, Artillerivej 5, 2300 Copenhagen S, Denmark;
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