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Immunoprophylaxis of Influenza using AAV Vector Delivery of Cross-Subtype Neutralizing Nanobodies

Del Rosario, Joanne Marie M.; (2020) Immunoprophylaxis of Influenza using AAV Vector Delivery of Cross-Subtype Neutralizing Nanobodies. Doctoral thesis (Ph.D), UCL (University College London). Green open access

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Abstract

Cross-subtype neutralizing single domain antibodies against influenza present new opportunities for immunoprophylaxis and pandemic preparedness. Their simple modular structure and single open reading frame format are highly amenable to gene therapy-mediated delivery. R1a-B6, an alpaca-derived single domain antibody (nanobody), that is capable of potent cross-subtype neutralization in vitro of H1N1, H5N1, H2N2, and H9N2 influenza viruses, through binding to a highly conserved epitope in the influenza hemagglutinin stem region, was previously described. To evaluate the potential of R1a-B6 for immunoprophylaxis via adeno-associated viral (AAV) vector delivery, it was reformatted as Fc fusions of mouse IgG1 (ADCC-) and IgG2a (ADCC+) isotypes. This is also to extend R1a-B6’s half-life and to assess the requirement for ADCC for efficacy of R1a-B6 in vitro and in vivo. It was found that reformatted R1a-B6 of either mouse IgG isotype retained its potent binding and neutralization activity against different Group I influenza A subtypes in vitro. The findings in this study also demonstrate that a single intramuscular injection in mice of AAV encoding R1a-B6-Fc was able to drive sustained high-level expression (0.5–1.1 mg/mL) of the nanobody-Fc in sera with no evidence of reduction for up to 6 months. R1a-B6-Fc fusions of both isotypes gave complete protection against lethal challenge with both pandemic A/California/07/2009 (H1N1)pdm09 and mouse-adapted avian influenza A/Vietnam/1194/2004 (H5N1). These data suggest that R1a-B6-Fc delivered via AAV is capable of cross-subtype protection and ADCC was not essential for protection. These findings reveal that AAV delivery of cross-subtype neutralizing nanobodies may be an effective strategy to prevent influenza infection and provide long-term protection independent of a host induced immune response.

Type: Thesis (Doctoral)
Qualification: Ph.D
Title: Immunoprophylaxis of Influenza using AAV Vector Delivery of Cross-Subtype Neutralizing Nanobodies
Event: UCL (University College London)
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: Copyright © The Author 2020. Original content in this thesis is licensed under the terms of the Creative Commons Attribution 4.0 International (CC BY 4.0) Licence (https://creativecommons.org/licenses/by/4.0/). Any third-party copyright material present remains the property of its respective owner(s) and is licensed under its existing terms. Access may initially be restricted at the author’s request.
Keywords: influenza, adeno associated viral vectors, monoclonal antibody, nanobody, antibody dependent cellular cytotoxicity
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Medical Sciences > Div of Infection and Immunity
URI: https://discovery.ucl.ac.uk/id/eprint/10107208
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