Abstract
Toll-like receptor (TLR) 2 and TLR4 are implicated in the recognition of various bacterial cell wall components, such as lipopolysaccharide (LPS). To investigate in vivo roles of TLR2, we generated TLR2-deficient mice. In contrast to LPS unresponsiveness in TLR4-deficient mice, TLR2-deficient mice responded to LPS to the same extent as wild-type mice. TLR2-deficient macrophages were hyporesponsive to several Gram-positive bacterial cell walls as well as Staphylococcus aureus peptidoglycan. TLR4-deficient macrophages lacked the response to Gram-positive lipoteichoic acids. These results demonstrate that TLR2 and TLR4 recognize different bacterial cell wall components in vivo and TLR2 plays a major role in Gram-positive bacterial recognition.
MeSH Terms
Animals
Antigens, Bacterial/immunology
Cell Wall/immunology
Corynebacterium diphtheriae/chemistry,immunology
Drosophila Proteins
Escherichia coli/chemistry,immunology
Female
Gram-Negative Bacteria/chemistry,immunology
Gram-Positive Bacteria/chemistry,immunology
Interleukin-1 Receptor-Associated Kinases
Lipid A/immunology
Lipopolysaccharides/immunology
Macrophages, Peritoneal/immunology
Male
Membrane Glycoproteins/deficiency,genetics,physiology
Mice
Mice, Inbred C57BL
Mice, Knockout
NF-kappa B/metabolism
Nocardia/chemistry,immunology
Peptidoglycan/immunology
Protein Isoforms/deficiency,genetics,physiology
Protein Kinases/metabolism
Receptors, Cell Surface/deficiency,genetics,physiology
Salmonella/chemistry,immunology
Signal Transduction
Species Specificity
Staphylococcus aureus/chemistry,immunology
Teichoic Acids/immunology
Toll-Like Receptor 2
Toll-Like Receptor 4
Toll-Like Receptors
Chemicals
Antigens, Bacterial
Drosophila Proteins
Lipid A
Lipopolysaccharides
Membrane Glycoproteins
NF-kappa B
Peptidoglycan
Protein Isoforms
Receptors, Cell Surface
Teichoic Acids
Toll-Like Receptor 2
Toll-Like Receptor 4
Toll-Like Receptors
lipoteichoic acid
Protein Kinases
Interleukin-1 Receptor-Associated Kinases
Authors & Affiliations
8 authors, click to expand affiliations / ORCID
Takeuchi O
Department of Host Defense, Research Institute for Microbial Diseases, Osaka University, Japan.
Hoshino K
Kawai T
Sanjo H
Takada H
Ogawa T
Takeda K
Akira S