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Finegoldia magna, an Anaerobic Gram-Positive Bacterium of the Normal Human Microbiota, Induces Inflammation by Activating Neutrophils

Neumann, Ariane LU ; Björck, Lars LU and Frick, Inga Maria LU (2020) In Frontiers in Microbiology 11.
Abstract

The Gram-positive anaerobic commensal Finegoldia magna colonizes the skin and other non-sterile body surfaces, and is an important opportunistic pathogen. Here we analyzed the effect of F. magna on human primary neutrophils. F. magna strains ALB8 (expressing protein FAF), 312 (expressing protein L) and 505 (naturally lacking both protein FAF and L) as well as their associated proteins activate neutrophils to release reactive oxygen species, an indication for neutrophil oxidative burst. Co-incubation of neutrophils with the bacteria leads to a strong increase of CD66b surface expression, another indicator for neutrophil activation. Furthermore, all tested stimuli triggered the release of NETs from the activated neutrophils, pointing to a... (More)

The Gram-positive anaerobic commensal Finegoldia magna colonizes the skin and other non-sterile body surfaces, and is an important opportunistic pathogen. Here we analyzed the effect of F. magna on human primary neutrophils. F. magna strains ALB8 (expressing protein FAF), 312 (expressing protein L) and 505 (naturally lacking both protein FAF and L) as well as their associated proteins activate neutrophils to release reactive oxygen species, an indication for neutrophil oxidative burst. Co-incubation of neutrophils with the bacteria leads to a strong increase of CD66b surface expression, another indicator for neutrophil activation. Furthermore, all tested stimuli triggered the release of NETs from the activated neutrophils, pointing to a host defense mechanism in response to the tested stimuli. This phenotype is dependent on actin rearrangement, NADPH oxidases and the ERK1/2 pathway. Proteins FAF and L also induced the secretion of several pro-inflammatory neutrophil proteins; HBP, IL-8 and INFγ. This study shows for the first time a direct interaction of F. magna with human neutrophils and suggests that the activation of neutrophils plays a role in F. magna pathogenesis.

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organization
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type
Contribution to journal
publication status
published
subject
keywords
anaerobic Gram-positive cocci, CD66b expression, GPAC, host-pathogen interactions, inflammation, NETs, neutrophils
in
Frontiers in Microbiology
volume
11
article number
65
publisher
Frontiers Media S. A.
external identifiers
  • scopus:85079496858
  • pmid:32117109
ISSN
1664-302X
DOI
10.3389/fmicb.2020.00065
language
English
LU publication?
yes
id
4a9852ff-d1b2-4a0e-8118-dd0be32f0097
date added to LUP
2020-03-02 14:50:26
date last changed
2024-04-17 05:21:14
@article{4a9852ff-d1b2-4a0e-8118-dd0be32f0097,
  abstract     = {{<p>The Gram-positive anaerobic commensal Finegoldia magna colonizes the skin and other non-sterile body surfaces, and is an important opportunistic pathogen. Here we analyzed the effect of F. magna on human primary neutrophils. F. magna strains ALB8 (expressing protein FAF), 312 (expressing protein L) and 505 (naturally lacking both protein FAF and L) as well as their associated proteins activate neutrophils to release reactive oxygen species, an indication for neutrophil oxidative burst. Co-incubation of neutrophils with the bacteria leads to a strong increase of CD66b surface expression, another indicator for neutrophil activation. Furthermore, all tested stimuli triggered the release of NETs from the activated neutrophils, pointing to a host defense mechanism in response to the tested stimuli. This phenotype is dependent on actin rearrangement, NADPH oxidases and the ERK1/2 pathway. Proteins FAF and L also induced the secretion of several pro-inflammatory neutrophil proteins; HBP, IL-8 and INFγ. This study shows for the first time a direct interaction of F. magna with human neutrophils and suggests that the activation of neutrophils plays a role in F. magna pathogenesis.</p>}},
  author       = {{Neumann, Ariane and Björck, Lars and Frick, Inga Maria}},
  issn         = {{1664-302X}},
  keywords     = {{anaerobic Gram-positive cocci; CD66b expression; GPAC; host-pathogen interactions; inflammation; NETs; neutrophils}},
  language     = {{eng}},
  publisher    = {{Frontiers Media S. A.}},
  series       = {{Frontiers in Microbiology}},
  title        = {{Finegoldia magna, an Anaerobic Gram-Positive Bacterium of the Normal Human Microbiota, Induces Inflammation by Activating Neutrophils}},
  url          = {{http://dx.doi.org/10.3389/fmicb.2020.00065}},
  doi          = {{10.3389/fmicb.2020.00065}},
  volume       = {{11}},
  year         = {{2020}},
}