Abstract:
:The activation of innate immune responses by nucleic acids is crucial to protective and pathological immunities and is mediated by the transmembrane Toll-like receptors (TLRs) and cytosolic receptors. However, it remains unknown whether a mechanism exists that integrates these nucleic-acid-sensing systems. Here we show that high-mobility group box (HMGB) proteins 1, 2 and 3 function as universal sentinels for nucleic acids. HMGBs bind to all immunogenic nucleic acids examined with a correlation between affinity and immunogenic potential. Hmgb1(-/-) and Hmgb2(-/-) mouse cells are defective in type-I interferon and inflammatory cytokine induction by DNA or RNA targeted to activate the cytosolic nucleic-acid-sensing receptors; cells in which the expression of all three HMGBs is suppressed show a more profound defect, accompanied by impaired activation of the transcription factors interferon regulatory factor 3 (IRF3) and nuclear factor (NF)-kappaB. The absence of HMGBs also severely impairs the activation of TLR3, TLR7 and TLR9 by their cognate nucleic acids. Our results therefore indicate a hierarchy in the nucleic-acid-mediated activation of immune responses, wherein the selective activation of nucleic-acid-sensing receptors is contingent on the more promiscuous sensing of nucleic acids by HMGBs. These findings may have implications for understanding the evolution of the innate immune system and for the treatment of immunological disorders.
journal_name
Naturejournal_title
Natureauthors
Yanai H,Ban T,Wang Z,Choi MK,Kawamura T,Negishi H,Nakasato M,Lu Y,Hangai S,Koshiba R,Savitsky D,Ronfani L,Akira S,Bianchi ME,Honda K,Tamura T,Kodama T,Taniguchi Tdoi
10.1038/nature08512subject
Has Abstractpub_date
2009-11-05 00:00:00pages
99-103issue
7269eissn
0028-0836issn
1476-4687pii
nature08512journal_volume
462pub_type
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