Abstract:
BACKGROUND:Asplenic individuals are susceptible for overwhelming infection with Streptococcus pneumoniae, carrying a high mortality. Although Toll-like receptor (TLR)-2 is considered the major receptor for Gram-positive bacteria in innate immunity, it does not play a major role in host defense against pneumococcal pneumonia. We wanted to investigate if in absence of an intact spleen as a first line of defense, the role of TLR2 during pneumococcal pneumonia becomes more significant, thereby explaining its insignificant role during infections in immune competent hosts. METHODS:We intranasally infected splenectomized wildtype (WT), TLR2 knock-out (KO) and TLR2/4 double KO mice with either serotype 2 or 3 S. pneumoniae. RESULTS:There were no differences between asplenic WT and TLR2KO mice of bacterial loads in lung homogenates and blood, cytokine and chemokine levels in the lungs, and lung pathology scores. TLR2/4 double KO mice were not impaired in bacterial control as well, which indicates that besides the interaction between S. pneumoniae and TLR2, the interaction between pneumolysin and TLR4 does not stimulate antibacterial defense in the asplenic host either. CONCLUSIONS:These results argue against a significant role of TLR2 in host defense during S. pneumoniae pneumonia in the asplenic state. Therefore, other components can provide sufficient backup mechanisms for TLR2 deficiency in the defense against intrapulmonary infections with S. pneumoniae of the otherwise immune competent host.
journal_name
BMC Infect Disjournal_title
BMC infectious diseasesauthors
Lammers AJ,de Porto AP,de Boer OJ,Florquin S,van der Poll Tdoi
10.1186/1471-2334-12-139subject
Has Abstractpub_date
2012-06-21 00:00:00pages
139issn
1471-2334pii
1471-2334-12-139journal_volume
12pub_type
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