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Endocytic pathways regulate Toll-like receptor 4 signaling and link innate and adaptive immunity

Husebye, Harald; Halaas, Øyvind; Stenmark, Harald; Tunheim, G; Sandanger, Øystein; Bogen, B; Brech, A; Latz, Eicke; Espevik, Terje
Journal article, Peer reviewed
Accepted version
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http://hdl.handle.net/11250/2498792
Utgivelsesdato
2006
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  • Institutt for klinisk og molekylær medisin [2599]
  • Publikasjoner fra CRIStin - NTNU [26591]
Originalversjon
EMBO Journal. 2006, 25 683-692.   10.1038/sj.emboj.7600991
Sammendrag
Immune responses are initiated when molecules of microbial origin are sensed by the Toll‐like receptors (TLRs). We now report the identification of essential molecular components for the trafficking of the lipopolysaccharide (LPS) receptor complex. LPS was endocytosed by a receptor‐mediated mechanism dependent on dynamin and clathrin and colocalized with TLR4 on early/sorting endosomes. TLR4 was ubiquitinated and associated with the ubiquitin‐binding endosomal sorting protein hepatocyte growth factor‐regulated tyrosine kinase substrate, Hrs. Inhibition of endocytosis and endosomal sorting increased LPS signaling. Finally, the LPS receptor complex was sorted to late endosomes/lysosomes for degradation and loading of associated antigens onto HLA class II molecules for presentation to CD4+ T cells. Our results show that endosomal trafficking of the LPS receptor complex is essential for signal termination and LPS‐associated antigen presentation, thus controlling both innate and adaptive immunity through TLR4.
Utgiver
EMBO Press
Tidsskrift
EMBO Journal

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