Abstract
AbstractBacterial lipopolysaccharide (LPS) triggers innate immune responses through Toll-like receptor (TLR) 4, a member of the TLR family that participates in pathogen recognition. TLRs recruit a cytoplasmic protein, MyD88, upon pathogen recognition, mediating its function for immune responses. Two major pathways for LPS have been suggested in recent studies, which are referred to as MyD88-dependent and -independent pathways. We report in this study the characterization of the MyD88-independent pathway via TLR4. MyD88-deficient cells failed to produce inflammatory cytokines in response to LPS, whereas they responded to LPS by activating IFN-regulatory factor 3 as well as inducing the genes containing IFN-stimulated regulatory elements such as IP-10. In contrast, a lipopeptide that activates TLR2 had no ability to activate IFN-regulatory factor 3. The MyD88-independent pathway was also activated in cells lacking both MyD88 and TNFR-associated factor 6. Thus, TLR4 signaling is composed of at least two distinct pathways, a MyD88-dependent pathway that is critical to the induction of inflammatory cytokines and a MyD88/TNFR-associated factor 6-independent pathway that regulates induction of IP-10.
Bibliography
Kawai, T., Takeuchi, O., Fujita, T., Inoue, J., MuÌhlradt, P. F., Sato, S., Hoshino, K., & Akira, S. (2001). Lipopolysaccharide Stimulates the MyD88-Independent Pathway and Results in Activation of IFN-Regulatory Factor 3 and the Expression of a Subset of Lipopolysaccharide-Inducible Genes. The Journal of Immunology, 167(10), 5887â5894.
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Dates
Type | When |
---|---|
Created | 11 years, 4 months ago (April 20, 2014, 10:55 p.m.) |
Deposited | 7 months, 4 weeks ago (Jan. 2, 2025, 11:52 a.m.) |
Indexed | 6 days, 5 hours ago (Aug. 24, 2025, 7:07 p.m.) |
Issued | 23 years, 9 months ago (Nov. 15, 2001) |
Published | 23 years, 9 months ago (Nov. 15, 2001) |
Published Print | 23 years, 9 months ago (Nov. 15, 2001) |
@article{Kawai_2001, title={Lipopolysaccharide Stimulates the MyD88-Independent Pathway and Results in Activation of IFN-Regulatory Factor 3 and the Expression of a Subset of Lipopolysaccharide-Inducible Genes}, volume={167}, ISSN={1550-6606}, url={http://dx.doi.org/10.4049/jimmunol.167.10.5887}, DOI={10.4049/jimmunol.167.10.5887}, number={10}, journal={The Journal of Immunology}, publisher={Oxford University Press (OUP)}, author={Kawai, Taro and Takeuchi, Osamu and Fujita, Takashi and Inoue, Jun-ichiro and Mühlradt, Peter F. and Sato, Shintaro and Hoshino, Katsuaki and Akira, Shizuo}, year={2001}, month=nov, pages={5887–5894} }