UspA2 is a cross-protective Moraxella catarrhalis vaccine antigen

•UspA2 is a potential Moraxella catarrhalis (Mcat) vaccine antigen.•UspA2 was shown to be immunogenic and to protect against lung colonization in mice.•UspA2 antibodies generated in three species were able to kill various Mcat strains.•UspA2 antibodies cross-reacted with variant UspA2H and UspA1.•Us...

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Veröffentlicht in:Vaccine 2021-09, Vol.39 (39), p.5641-5649
Hauptverfasser: Ysebaert, Carine, Castado, Cindy, Mortier, Marie-Cécile, Rioux, Stéphane, Feron, Christiane, Di Paolo, Emmanuel, Weynants, Vincent, Blais, Normand, Devos, Nathalie, Hermand, Philippe
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container_end_page 5649
container_issue 39
container_start_page 5641
container_title Vaccine
container_volume 39
creator Ysebaert, Carine
Castado, Cindy
Mortier, Marie-Cécile
Rioux, Stéphane
Feron, Christiane
Di Paolo, Emmanuel
Weynants, Vincent
Blais, Normand
Devos, Nathalie
Hermand, Philippe
description •UspA2 is a potential Moraxella catarrhalis (Mcat) vaccine antigen.•UspA2 was shown to be immunogenic and to protect against lung colonization in mice.•UspA2 antibodies generated in three species were able to kill various Mcat strains.•UspA2 antibodies cross-reacted with variant UspA2H and UspA1.•UspA2 is a cross-reactive Mcat antigen showing properties of a vaccine candidate. Moraxella catarrhalis (Mcat) is a key pathogen associated with exacerbations of chronic obstructive pulmonary disease (COPD) in adults and playing a significant role in otitis media in children. A vaccine would help to reduce the morbidity and mortality associated with these diseases. UspA2 is an Mcat surface antigen considered earlier as vaccine candidate before the interest in this molecule vanished due to sequence variability. However, the observation that some conserved domains are the target of bactericidal antibodies prompted us to reconsider UspA2 as a potential vaccine antigen. We first determined its prevalence among the COPD patients from the AERIS study, as the prevalence of UspA2 in a COPD-restricted population had yet to be documented. The gene was found in all Mcat isolates either as UspA2 or UspA2H variant. The percentage of UspA2H variant was higher than in any report so far, reaching 51%. A potential link between the role of UspA2H in biofilm formation and this high prevalence is discussed. To study further UspA2 as a vaccine antigen, recombinant UspA2 molecules were designed and used in animal models and bactericidal assays. We showed that UspA2 is immunogenic and that UspA2 immunization clears Mcat pulmonary challenge in a mouse model. In a serum bactericidal assay, anti-UspA2 antibodies generated in mice, guinea pigs or rabbits were able to kill Mcat strains of various origins, including a subset of isolates from the AERIS study, cross-reacting with UspA2H and even UspA1, a closely related Mcat surface protein. In conclusion, UspA2 is a cross-reactive Mcat antigen presenting the characteristics of a vaccine candidate.
doi_str_mv 10.1016/j.vaccine.2021.08.002
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Moraxella catarrhalis (Mcat) is a key pathogen associated with exacerbations of chronic obstructive pulmonary disease (COPD) in adults and playing a significant role in otitis media in children. A vaccine would help to reduce the morbidity and mortality associated with these diseases. UspA2 is an Mcat surface antigen considered earlier as vaccine candidate before the interest in this molecule vanished due to sequence variability. However, the observation that some conserved domains are the target of bactericidal antibodies prompted us to reconsider UspA2 as a potential vaccine antigen. We first determined its prevalence among the COPD patients from the AERIS study, as the prevalence of UspA2 in a COPD-restricted population had yet to be documented. The gene was found in all Mcat isolates either as UspA2 or UspA2H variant. The percentage of UspA2H variant was higher than in any report so far, reaching 51%. A potential link between the role of UspA2H in biofilm formation and this high prevalence is discussed. To study further UspA2 as a vaccine antigen, recombinant UspA2 molecules were designed and used in animal models and bactericidal assays. We showed that UspA2 is immunogenic and that UspA2 immunization clears Mcat pulmonary challenge in a mouse model. In a serum bactericidal assay, anti-UspA2 antibodies generated in mice, guinea pigs or rabbits were able to kill Mcat strains of various origins, including a subset of isolates from the AERIS study, cross-reacting with UspA2H and even UspA1, a closely related Mcat surface protein. 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Moraxella catarrhalis (Mcat) is a key pathogen associated with exacerbations of chronic obstructive pulmonary disease (COPD) in adults and playing a significant role in otitis media in children. A vaccine would help to reduce the morbidity and mortality associated with these diseases. UspA2 is an Mcat surface antigen considered earlier as vaccine candidate before the interest in this molecule vanished due to sequence variability. However, the observation that some conserved domains are the target of bactericidal antibodies prompted us to reconsider UspA2 as a potential vaccine antigen. We first determined its prevalence among the COPD patients from the AERIS study, as the prevalence of UspA2 in a COPD-restricted population had yet to be documented. The gene was found in all Mcat isolates either as UspA2 or UspA2H variant. The percentage of UspA2H variant was higher than in any report so far, reaching 51%. A potential link between the role of UspA2H in biofilm formation and this high prevalence is discussed. To study further UspA2 as a vaccine antigen, recombinant UspA2 molecules were designed and used in animal models and bactericidal assays. We showed that UspA2 is immunogenic and that UspA2 immunization clears Mcat pulmonary challenge in a mouse model. In a serum bactericidal assay, anti-UspA2 antibodies generated in mice, guinea pigs or rabbits were able to kill Mcat strains of various origins, including a subset of isolates from the AERIS study, cross-reacting with UspA2H and even UspA1, a closely related Mcat surface protein. 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identifier ISSN: 0264-410X
ispartof Vaccine, 2021-09, Vol.39 (39), p.5641-5649
issn 0264-410X
1873-2518
language eng
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source Access via ScienceDirect (Elsevier); ProQuest Central UK/Ireland
subjects AERIS
Amino acids
Animal models
Antibodies
Antigens
Biofilms
Chromatography
Chronic obstructive pulmonary disease
Conserved sequence
COPD
Cross-reactivity
Guinea pigs
Immunization
Immunogenicity
Laboratories
Lung diseases
Moraxella catarrhalis
Morbidity
Obstructive lung disease
Otitis media
Pathogens
Pediatrics
Proteins
Rabbits
UspA2
Vaccine
Vaccines
title UspA2 is a cross-protective Moraxella catarrhalis vaccine antigen
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