Linked Life Data

19008951

Source:http://linkedlifedata.com/resource/pubmed/id/19008951

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pubmed-article:19008951pubmed:abstractTextThe early systemic production of interferon (IFN)-alphabeta is an essential component of the antiviral host defense mechanisms, but is also thought to contribute to the toxic side effects accompanying gene therapy with adenoviral vectors. Here we investigated the IFN-alphabeta response to human adenoviruses (Ads) in mice. By comparing the responses of normal, myeloid (m)DC- and plasmacytoid (p)DC-depleted mice and by measuring IFN-alphabeta mRNA expression in different organs and cells types, we show that in vivo, Ads elicit strong and rapid IFN-alphabeta production, almost exclusively in splenic mDCs. Using knockout mice, various strains of Ads (wild type, mutant and UV-inactivated) and MAP kinase inhibitors, we demonstrate that the Ad-induced IFN-alphabeta response does not require Toll-like receptors (TLR), known cytosolic sensors of RNA (RIG-I/MDA-5) and DNA (DAI) recognition and interferon regulatory factor (IRF)-3, but is dependent on viral endosomal escape, signaling via the MAP kinase SAPK/JNK and IRF-7. Furthermore, we show that Ads induce IFN-alphabeta and IL-6 in vivo by distinct pathways and confirm that IFN-alphabeta positively regulates the IL-6 response. Finally, by measuring TNF-alpha responses to LPS in Ad-infected wild type and IFN-alphabetaR(-/-) mice, we show that IFN-alphabeta is the key mediator of Ad-induced hypersensitivity to LPS. These findings indicate that, like endosomal TLR signaling in pDCs, TLR-independent virus recognition in splenic mDCs can also produce a robust early IFN-alphabeta response, which is responsible for the bulk of IFN-alphabeta production induced by adenovirus in vivo. The signaling requirements are different from known TLR-dependent or cytosolic IFN-alphabeta induction mechanisms and suggest a novel cytosolic viral induction pathway. The hypersensitivity to components of the microbial flora and invading pathogens may in part explain the toxic side effects of adenoviral gene therapy and contribute to the pathogenesis of adenoviral disease.lld:pubmed
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