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Toll-like receptors (TLR) are crucial pattern recognition receptors in innate immunity. The importance of TLR2 in host defense against Gram-positive bacteria has been suggested by the fact that this receptor recognizes major Gram-positive cell wall components, such as peptidoglycan and lipoteichoic acid. To determine the role of TLR2 in pulmonary Gram-positive infection, we first established that TLR2 is indispensable for alveolar macrophage responsiveness toward Streptococcus pneumoniae. Nonetheless, TLR2 gene-deficient mice intranasally inoculated with S. pneumoniae at doses varying from nonlethal (with complete clearance of the infection) to lethal displayed only a modestly reduced inflammatory response in their lungs and an unaltered antibacterial defense when compared with normal wild-type mice. These data suggest that TLR2 plays a limited role in the innate immune response to pneumococcal pneumonia, and that additional pattern recognition receptors likely are involved in host defense against this common respiratory pathogen.

Toll-Like Receptor 2 Plays a Role in the Early Inflammatory Response to Murine Pneumococcal Pneumonia but Does Not Contribute to Antibacterial Defense