Journal
JOURNAL OF EXPERIMENTAL MEDICINE
Volume 210, Issue 11, Pages 2447-2463Publisher
ROCKEFELLER UNIV PRESS
DOI: 10.1084/jem.20120201
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Funding
- Division of Intramural Research, National Institute of Allergy and Infectious Diseases, National Institutes of Health (NIH)
- NIH
- Deutsche Forschungsgesellschaft (DFG) [SFB704]
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Recognition of DNA and RNA molecules derived from pathogens or self-antigen is one way the mammalian immune system senses infection and tissue damage. Activation of immune signaling receptors by nucleic acids is controlled by limiting the access of DNA and RNA to intracellular receptors, but the mechanisms by which endosome-resident receptors encounter nucleic acids from the extracellular space are largely undefined. In this study, we show that the receptor for advanced glycation end-products (RAGE) promoted DNA uptake into endosomes and lowered the immune recognition threshold for the activation of Toll-like receptor 9, the principal DNA-recognizing transmembrane signaling receptor. Structural analysis of RAGE-DNA complexes indicated that DNA interacted with dimers of the outer-most RAGE extracellular domains, and could induce formation of higher-order receptor complexes. Furthermore, mice deficient in RAGE were unable to mount a typical inflammatory response to DNA in the lung, indicating that RAGE is important for the detection of nucleic acids in vivo.
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