Antibacterial Fusion Proteins Enhance Moraxella catarrhalis Killing
Authors
Laabei, MaisemColineau, Lucie
Bettoni, Serena
Maziarz, Karolina
Ermert, David
Riesbeck, Kristian
Ram, Sanjay
Blom, Anna M.
UMass Chan Affiliations
Department of Medicine, Division of Infectious Diseases and ImmunologyDocument Type
Journal ArticlePublication Date
2020-09-02Keywords
Moraxella catarrhalisantibacterial
complement
fusion proteins
pathogen
Bacteria
Bacterial Infections and Mycoses
Bacteriology
Immunity
Immunology of Infectious Disease
Immunotherapy
Pathogenic Microbiology
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Moraxella catarrhalis is a human-specific commensal of the respiratory tract and an opportunistic pathogen. It is one of the leading cause of otitis media in children and of acute exacerbations in patients with chronic obstructive pulmonary disease, resulting in significant morbidity and economic burden. Vaccines and new immunotherapeutic strategies to treat this emerging pathogen are needed. Complement is a key component of innate immunity that mediates the detection, response, and subsequent elimination of invading pathogens. Many pathogens including M. catarrhalis have evolved complement evasion mechanisms, which include the binding of human complement inhibitors such as C4b-binding protein (C4BP) and Factor H (FH). Inhibiting C4BP and FH acquisition by M. catarrhalis may provide a novel therapeutic avenue to treat infections. To achieve this, we created two chimeric proteins that combined the Moraxella-binding domains of C4BP and FH fused to human immunoglobulin Fcs: C4BP domains 1 and 2 and FH domains 6 and 7 fused to IgM and IgG Fc, respectively. As expected, FH6-7/IgG displaced FH from the bacterial surface while simultaneously activating complement via Fc-C1q interactions, together increasing pathogen elimination. C4BP1-2/IgM also increased serum killing of the bacteria through enhanced complement deposition, but did not displace C4BP from the surface of M. catarrhalis. These Fc fusion proteins could act as anti-infective immunotherapies. Many microbes bind the complement inhibitors C4BP and FH through the same domains as M. catarrhalis, therefore these Fc fusion proteins may be promising candidates as adjunctive therapy against many different drug-resistant pathogens.Source
Laabei M, Colineau L, Bettoni S, Maziarz K, Ermert D, Riesbeck K, Ram S, Blom AM. Antibacterial Fusion Proteins Enhance Moraxella catarrhalis Killing. Front Immunol. 2020 Sep 2;11:2122. doi: 10.3389/fimmu.2020.02122. PMID: 32983170; PMCID: PMC7492680. Link to article on publisher's site
DOI
10.3389/fimmu.2020.02122Permanent Link to this Item
http://hdl.handle.net/20.500.14038/41567PubMed ID
32983170Related Resources
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Copyright © 2020 Laabei, Colineau, Bettoni, Maziarz, Ermert, Riesbeck, Ram and Blom. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.Distribution License
http://creativecommons.org/licenses/by/4.0/ae974a485f413a2113503eed53cd6c53
10.3389/fimmu.2020.02122
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Except where otherwise noted, this item's license is described as Copyright © 2020 Laabei, Colineau, Bettoni, Maziarz, Ermert, Riesbeck, Ram and Blom. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.