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Outer membrane vesicles shield Moraxella catarrhalis β-lactamase from neutralization by serum IgG.

Schaar, Viveka LU ; Paulsson, Magnus LU orcid ; Mörgelin, Matthias LU and Riesbeck, Kristian LU orcid (2013) In Journal of Antimicrobial Chemotherapy 68(3). p.593-600
Abstract
OBJECTIVES: The aim of this study was to detect the presence of IgG against Moraxella catarrhalis β-lactamase in healthy adults, and to determine whether outer membrane vesicles (OMVs) could protect the enzyme from inhibition by anti-β-lactamase IgG. METHODS: Transmission electron microscopy was used to detect the presence of β-lactamase in OMVs. Sera were examined by ELISA for specific IgG directed against recombinant M. catarrhalis β-lactamase in addition to the outer membrane adhesins MID/Hag, UspA1 and A2. Binding of anti-β-lactamase IgG from serum to OMVs was analysed by flow cytometry. The chromogenic substrate nitrocefin was used to quantify β-lactamase enzyme activity. RESULTS: The presence of β-lactamase was determined in OMVs... (More)
OBJECTIVES: The aim of this study was to detect the presence of IgG against Moraxella catarrhalis β-lactamase in healthy adults, and to determine whether outer membrane vesicles (OMVs) could protect the enzyme from inhibition by anti-β-lactamase IgG. METHODS: Transmission electron microscopy was used to detect the presence of β-lactamase in OMVs. Sera were examined by ELISA for specific IgG directed against recombinant M. catarrhalis β-lactamase in addition to the outer membrane adhesins MID/Hag, UspA1 and A2. Binding of anti-β-lactamase IgG from serum to OMVs was analysed by flow cytometry. The chromogenic substrate nitrocefin was used to quantify β-lactamase enzyme activity. RESULTS: The presence of β-lactamase was determined in OMVs from a 9-year-old child suffering from M. catarrhalis sinusitis. Furthermore, anti-β-lactamase IgG was detected in sera obtained from healthy adults. Out of 40 adult blood donors (aged 18-65 years) tested, 6 (15.0%) carried anti-β-lactamase IgG. No correlation between IgG titres against β-lactamase and the adhesins was found. Flow cytometry analyses revealed that anti-β-lactamase IgG from serum bound to β-lactamase-positive OMVs. By comparing the β-lactamase activity of intact OMV with OMV that were permeabilized with saponin we found that OMVs shielded active β-lactamase from the anti-β-lactamase IgG. CONCLUSIONS: Moraxella catarrhalis β-lactamase is found in, or associated with, OMVs, providing clinical relevance for the vesicles in the spread of antibiotic resistance. Furthermore, OMVs protect β-lactamase from specific IgG. (Less)
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author
; ; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Journal of Antimicrobial Chemotherapy
volume
68
issue
3
pages
593 - 600
publisher
Oxford University Press
external identifiers
  • wos:000314893700020
  • pmid:23184710
  • scopus:84873597322
  • pmid:23184710
ISSN
1460-2091
DOI
10.1093/jac/dks444
language
English
LU publication?
yes
id
3066fe04-97b3-4398-8f17-2872ea5b0a07 (old id 3218462)
alternative location
http://www.ncbi.nlm.nih.gov/pubmed/23184710?dopt=Abstract
date added to LUP
2016-04-01 10:47:22
date last changed
2024-01-07 01:15:54
@article{3066fe04-97b3-4398-8f17-2872ea5b0a07,
  abstract     = {{OBJECTIVES: The aim of this study was to detect the presence of IgG against Moraxella catarrhalis β-lactamase in healthy adults, and to determine whether outer membrane vesicles (OMVs) could protect the enzyme from inhibition by anti-β-lactamase IgG. METHODS: Transmission electron microscopy was used to detect the presence of β-lactamase in OMVs. Sera were examined by ELISA for specific IgG directed against recombinant M. catarrhalis β-lactamase in addition to the outer membrane adhesins MID/Hag, UspA1 and A2. Binding of anti-β-lactamase IgG from serum to OMVs was analysed by flow cytometry. The chromogenic substrate nitrocefin was used to quantify β-lactamase enzyme activity. RESULTS: The presence of β-lactamase was determined in OMVs from a 9-year-old child suffering from M. catarrhalis sinusitis. Furthermore, anti-β-lactamase IgG was detected in sera obtained from healthy adults. Out of 40 adult blood donors (aged 18-65 years) tested, 6 (15.0%) carried anti-β-lactamase IgG. No correlation between IgG titres against β-lactamase and the adhesins was found. Flow cytometry analyses revealed that anti-β-lactamase IgG from serum bound to β-lactamase-positive OMVs. By comparing the β-lactamase activity of intact OMV with OMV that were permeabilized with saponin we found that OMVs shielded active β-lactamase from the anti-β-lactamase IgG. CONCLUSIONS: Moraxella catarrhalis β-lactamase is found in, or associated with, OMVs, providing clinical relevance for the vesicles in the spread of antibiotic resistance. Furthermore, OMVs protect β-lactamase from specific IgG.}},
  author       = {{Schaar, Viveka and Paulsson, Magnus and Mörgelin, Matthias and Riesbeck, Kristian}},
  issn         = {{1460-2091}},
  language     = {{eng}},
  number       = {{3}},
  pages        = {{593--600}},
  publisher    = {{Oxford University Press}},
  series       = {{Journal of Antimicrobial Chemotherapy}},
  title        = {{Outer membrane vesicles shield Moraxella catarrhalis β-lactamase from neutralization by serum IgG.}},
  url          = {{https://lup.lub.lu.se/search/files/2137826/3878916.pdf}},
  doi          = {{10.1093/jac/dks444}},
  volume       = {{68}},
  year         = {{2013}},
}