The role of TLR2 in the host response to pneumococcal pneumonia in absence of the spleen.

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 Dis

journal_title

BMC infectious diseases

authors

Lammers AJ,de Porto AP,de Boer OJ,Florquin S,van der Poll T

doi

10.1186/1471-2334-12-139

subject

Has Abstract

pub_date

2012-06-21 00:00:00

pages

139

issn

1471-2334

pii

1471-2334-12-139

journal_volume

12

pub_type

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