Macrophage recognition of invading pathogens is essential for the initiation of the innate immune response and the subsequent development of adaptive immunity. Specific recognition of bacterial components is mediated by Toll-like receptors (TLRs) that are recruited to phagosomes where they initiate inflammatory responses. TLR4 recognizes lipopolysaccharide from Gram-negative bacteria, and TLR2 recognizes distinct components of the Gram-positive bacterial cell wall. In addition, TLR2 and 6 cooperate in the recognition of an array of other cell wall components from Gram-positive bacteria, Mycobacteria and yeast. In this proposal, the applicant seeks to define the mechanisms by which TLRs 2, 4 and 6 discriminate between pathogens, activate appropriate responses in macrophages, and orchestrate an effective immune response to infection in mice. He will structurally map the ligand recognition domains of TLRs 2, 4 and 6, and determine whether bacterial products activate these receptors by generating endogenous ligands. He will establish how TLRs are recruited to phagosomes, whether they are selectively recruited to inflammatory phagosomes, and whether their association with phagosomes have consequences for host defense. He will explore differences in the signaling pathways activated by TLRs 2, 4 and 6 in order to determine the biological consequences of specific pathogen recognition. The role of TLRs 2 and 6 in host defense will be further explored in mice that have macrophage/neutrophil-specific defects in these receptors.

Agency
National Institute of Health (NIH)
Institute
National Institute of Allergy and Infectious Diseases (NIAID)
Type
Research Project (R01)
Project #
5R01AI032972-14
Application #
6644881
Study Section
Bacteriology and Mycology Subcommittee 2 (BM)
Program Officer
Dong, Gang
Project Start
1992-07-01
Project End
2005-05-31
Budget Start
2003-06-01
Budget End
2004-05-31
Support Year
14
Fiscal Year
2003
Total Cost
$521,316
Indirect Cost
Name
Institute for Systems Biology
Department
Type
DUNS #
135646524
City
Seattle
State
WA
Country
United States
Zip Code
98109
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