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Toll-like receptor-2 mediates mycobacteria-induced proinflammatory signaling in macrophages
Open accessAbstract
The recognition of mycobacterial cell wall components causes macrophages to secrete tumor necrosis factor α (TNF-α) and other cytokines that are essential for the development of a protective inflammatory response. We show that toll-like receptors are required for the induction of TNF-α in macrophages by Mycobacterium tuberculosis. Expression of a dominant negative form of MyD88 (a signaling component required for toll-like receptor signaling) in a mouse macrophage cell line blocks TNF-α production induced by M. tuberculosis. We identify toll-like receptor-2 (TLR2) as the specific toll-like receptor required for this induction by showing that expression of an inhibitory TLR2 (TLR2-P681H) blocks TNF-α production induced by whole M. tuberculosis. Further, we show that TLR2-dependent signaling mediates responses to mycobacterial cell wall fractions enriched for lipoarrabinomannan, mycolylarabinogalactan–peptidoglycan complex, or M. tuberculosis total lipids. Thus, although many mycobacterial cell wall fractions are identified to be inflammatory, all require TLR2 for induction of TNF-α in macrophages. These data suggest that TLR2 is essential for the induction of a protective immune response to mycobacteria.
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Metadata
- Authors
- Underhill, D. M., Ozinsky, A., Smith, K. D., & Aderem, A.
- Venue
- Proceedings of the National Academy of Sciences
- Published
- 1999-12-07
- Volume
- 96
- Issue
- 25
- Pages
- 14459-14463
- ISSN
- 0027-8424 (ISSN-L)
- 1091-6490
- OpenAlex
- W2014679097
- Cited by
- 827
- References
- 2
- FWCI
- 14.53
- Type
- journal article
- Language
- en
- Open access
- green
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
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