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Type: Journal article
Title: Toll-like receptor 2 contributes to antibacterial defence against pneumolysin-deficient pneumococci
Author: Dessing, M.
Florquin, S.
Paton, J.
van der Poll, T.
Citation: Cellular Microbiology, 2008; 10(1):237-246
Publisher: Blackwell Science Ltd
Issue Date: 2008
ISSN: 1462-5814
Statement of
Mark C. Dessing, Sandrine Florquin, James C. Paton and Tom van der Poll
Abstract: Toll-like receptors (TLRs) are pattern recognition receptors that recognize conserved molecular patterns expressed by pathogens. Pneumolysin, an intracellular toxin found in all Streptococcus pneumoniae clinical isolates, is an important virulence factor of the pneumococcus that is recognized by TLR4. Although TLR2 is considered the most important receptor for Gram-positive bacteria, our laboratory previously could not demonstrate a decisive role for TLR2 in host defence against pneumonia caused by a serotype 3 S. pneumoniae. Here we tested the hypothesis that in the absence of TLR2, S. pneumoniae can still be sensed by the immune system through an interaction between pneumolysin and TLR4. C57BL/6 wild-type (WT) and TLR2 knockout (KO) mice were intranasally infected with either WT S. pneumoniae D39 (serotype 2) or the isogenic pneumolysin-deficient S. pneumoniae strain D39 PLN. TLR2 did not contribute to antibacterial defence against WT S. pneumoniae D39. In contrast, pneumolysin-deficient S. pneumoniae only grew in lungs of TLR2 KO mice. TLR2 KO mice displayed a strongly reduced early inflammatory response in their lungs during pneumonia caused by both pneumolysin-producing and pneumolysin-deficient pneumococci. These data suggest that pneumolysin-induced TLR4 signalling can compensate for TLR2 deficiency during respiratory tract infection with S. pneumoniae.
Keywords: Lung
Mice, Inbred C57BL
Mice, Knockout
Streptococcus pneumoniae
Pneumonia, Pneumococcal
Bacterial Proteins
Colony Count, Microbial
Survival Analysis
Toll-Like Receptor 2
Description: © 2008 Blackwell Publishing Ltd
DOI: 10.1111/j.1462-5822.2007.01035.x
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Appears in Collections:Aurora harvest
Molecular and Biomedical Science publications

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