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Dowell AC, Tut G, Begum J, Bruton R, Bentley C, Butler M, Uwenedi G, Zuo J, Powell AA, Brent AJ, Brent B, Baawuah F, Okike I, Beckmann J, Ahmad S, Aiano F, Garstang J, Ramsay ME, Moss P, Ladhani SN. Nasal mucosal IgA levels against SARS-CoV-2 and seasonal coronaviruses are low in children but boosted by reinfection. J Infect 2023; 87:403-412. [PMID: 37660754 DOI: 10.1016/j.jinf.2023.08.013] [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: 06/22/2023] [Revised: 08/25/2023] [Accepted: 08/29/2023] [Indexed: 09/05/2023]
Abstract
Repeated coronavirus infections in childhood drive progressive maturation of systemic immune responses into adulthood. Analyses of immune responses in children have focused primarily upon systemic assessment but the importance of mucosal immunity is increasingly recognised. We studied virus-specific antibody responses in contemporaneous nasal swabs and blood samples from 99 children (4-15 years) and 28 adults (22-56 years), all of whom had prior SARS-CoV-2 infection. Whilst mucosal IgA titres against Influenza and Respiratory Syncytial virus were comparable between children and adults, those against all coronaviruses, including SARS-CoV-2, were lower in children. Mucosal IgA antibodies demonstrated comparable relative neutralisation capacity in both groups and retained activity against recent omicron variants such as XBB.1 which are highly evasive of IgG neutralisation. SARS-CoV-2 reinfection preferentially enhanced mucosal IgA responses whilst the impact of vaccination was more modest. Nasal IgA levels against coronaviruses thus display a pattern of incremental response to reinfection which likely determines the natural history of reinfection. This highlights the particular significance of developing mucosal vaccines against coronaviruses in children.
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Affiliation(s)
- Alexander C Dowell
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Gokhan Tut
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jusnara Begum
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Rachel Bruton
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Christopher Bentley
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Megan Butler
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Grace Uwenedi
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Jianmin Zuo
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom
| | - Annabel A Powell
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom
| | - Andrew J Brent
- Oxford University Hospitals NHS Foundation Trust, Old Road, Oxford, United Kingdom; University of Oxford, Wellington Square, Oxford, United Kingdom
| | - Bernadette Brent
- Oxford University Hospitals NHS Foundation Trust, Old Road, Oxford, United Kingdom
| | - Frances Baawuah
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom
| | - Ifeanyichukwu Okike
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom; University Hospitals of Derby and Burton NHS Foundation Trust, Uttoxeter New Road, Derby, United Kingdom
| | - Joanne Beckmann
- East London NHS Foundation Trust, 9 Allie Street, London, United Kingdom
| | - Shazaad Ahmad
- Manchester University NHS Foundation Trust, Oxford Road, Manchester, United Kingdom
| | - Felicity Aiano
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom
| | - Joanna Garstang
- Birmingham Community Healthcare NHS Trust, Holt Street, Aston, United Kingdom
| | - Mary E Ramsay
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom
| | - Paul Moss
- Institute of Immunology & Immunotherapy, College of Medical and Dental Sciences, University of Birmingham, Birmingham, United Kingdom.
| | - Shamez N Ladhani
- Immunisation Department, UK Health Security Agency, 61 Colindale Avenue, London, United Kingdom.
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Dormeshkin D, Shapira M, Dubovik S, Kavaleuski A, Katsin M, Migas A, Meleshko A, Semyonov S. Isolation of an escape-resistant SARS-CoV-2 neutralizing nanobody from a novel synthetic nanobody library. Front Immunol 2022; 13:965446. [PMID: 36189235 PMCID: PMC9524272 DOI: 10.3389/fimmu.2022.965446] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Accepted: 08/29/2022] [Indexed: 11/13/2022] Open
Abstract
The COVID−19 pandemic not only resulted in a global crisis, but also accelerated vaccine development and antibody discovery. Herein we report a synthetic humanized VHH library development pipeline for nanomolar-range affinity VHH binders to SARS-CoV-2 variants of concern (VoC) receptor binding domains (RBD) isolation. Trinucleotide-based randomization of CDRs by Kunkel mutagenesis with the subsequent rolling-cycle amplification resulted in more than 1011 diverse phage display library in a manageable for a single person number of electroporation reactions. We identified a number of nanomolar-range affinity VHH binders to SARS-CoV-2 variants of concern (VoC) receptor binding domains (RBD) by screening a novel synthetic humanized antibody library. In order to explore the most robust and fast method for affinity improvement, we performed affinity maturation by CDR1 and CDR2 shuffling and avidity engineering by multivalent trimeric VHH fusion protein construction. As a result, H7-Fc and G12x3-Fc binders were developed with the affinities in nM and pM range respectively. Importantly, these affinities are weakly influenced by most of SARS-CoV-2 VoC mutations and they retain moderate binding to BA.4\5. The plaque reduction neutralization test (PRNT) resulted in IC50 = 100 ng\ml and 9.6 ng\ml for H7-Fc and G12x3-Fc antibodies, respectively, for the emerging Omicron BA.1 variant. Therefore, these VHH could expand the present landscape of SARS-CoV-2 neutralization binders with the therapeutic potential for present and future SARS-CoV-2 variants.
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Affiliation(s)
- Dmitri Dormeshkin
- Laboratory of Molecular Diagnostics and Biotechnology, Institute of Bioorganic Chemistry of the National academy of Sciences of Belarus, Minsk, Belarus
- *Correspondence: Dmitri Dormeshkin,
| | - Michail Shapira
- Laboratory of Molecular Diagnostics and Biotechnology, Institute of Bioorganic Chemistry of the National academy of Sciences of Belarus, Minsk, Belarus
| | - Simon Dubovik
- Department of Biology, Belarusian State University, Minsk, Belarus
| | - Anton Kavaleuski
- Institute of Science and Technology Austria (ISTA), Klosterneuburg, Austria
| | - Mikalai Katsin
- Imunovakcina, UAB, Vilnius, Lithuania
- Immunofusion, LLC, Minsk, Belarus
| | - Alexandr Migas
- Imunovakcina, UAB, Vilnius, Lithuania
- Immunofusion, LLC, Minsk, Belarus
| | | | - Sergei Semyonov
- Laboratory of Biosafety With Pathogens Collection, Republican Research and Practical Center for Epidemiology & Microbiology, Minsk, Belarus
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