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Lactobacillus inhibits Streptococcus pyogenes adherence by different antiadhesive properties
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
Stockholm University, Faculty of Science, Department of Molecular Biosciences, The Wenner-Gren Institute.
(English)Manuscript (preprint) (Other academic)
National Category
Microbiology
Research subject
Molecular Bioscience
Identifiers
URN: urn:nbn:se:su:diva-92690OAI: oai:DiVA.org:su-92690DiVA: diva2:640898
Available from: 2013-08-14 Created: 2013-08-14 Last updated: 2013-08-16Bibliographically approved
In thesis
1. Interplay between bacteria and host epithelial cells
Open this publication in new window or tab >>Interplay between bacteria and host epithelial cells
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Bacterial pathogens have developed multiple ways of manipulating host cell functions to exploit the host environment. We found that interactions with epithelial cells increase the resistance of the human pathogen Neisseria meningitidis to the antimicrobial peptide LL-37. This resistance was dependent on host cell cholesterol-rich microdomains and RhoA/Cdc42-dependent signalling.

At mucosal surfaces, pathogenic bacteria compete with the resident microbiota. Lactobacillus inhibits the adherence of a wide range of pathogens, however, the mechanisms of inhibition are still largely unknown. We demonstrate that certain lactobacilli interfere with host cell signalling pathways used by pathogenic bacteria during initial colonisation. Inhibitory lactobacilli blocked the pathogen-induced activation of Src, increases of host cytosolic [Ca2+] and upregulation of Egr1, in a TLR2-dependent fashion. We further identify Egr1 as a host factor crucial for efficient pathogen adherence. The pathogens used in these studies were N. meningitidis, Helicobacter pylori and Streptococcus pyogenes.

In summary, these studies highlight that the interplay between bacteria and host cells is a critical determinant of pathogenesis and bacterial co-existence in the host.

Place, publisher, year, edition, pages
Stockholm: Department of Molecular Biosciences, The Wenner-Gren Institute, Stockholm University, 2013. 96 p.
Keyword
Microbial-cell interaction, Adherence, Infection, Lactic acid bacteria, Antimicrobial peptides
National Category
Microbiology
Research subject
Molecular Bioscience
Identifiers
urn:nbn:se:su:diva-92692 (URN)978-91-7447-735-1 (ISBN)
Public defence
2013-09-20, William-Olssonsalen, Geovetenskapens hus, Svante Arrhenius väg 14, Stockholm, 10:00 (English)
Opponent
Supervisors
Note

At the time of the doctoral defense, the following papers were unpublished and had a status as follows: Paper 2: Epub ahead of print. Paper 3: Submitted. Paper 4: Manuscript.

Available from: 2013-08-29 Created: 2013-08-14 Last updated: 2013-08-19Bibliographically approved

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Maudsdotter, LisaTavares, RaquelJonsson, Ann-Beth
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