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Ubol, Sukathida; Phuklia, Weerawat; Kalayanarooj, Siripen; Modhiran, Naphak
The Journal of infectious diseases, 03/2010, Letnik: 201, Številka: 6Journal Article
We have found that dengue virus (DENV) not only uses preexisting enhancing antibodies to promote its entry into Fc receptor-bearing cells but also exploits enhancing antibodies for intracellular immune evasion through 2 mechanisms. In the first mechanism, entry of DENV-antibody complexes into human monocytic cells activates negative regulators, dihydroxyacetone kinase and autophagy-related 5-autophagy-related 12, which then disrupt the retinoic acide incucible gene I and melanoma differentiation associated gene 5 signaling cascade and disable type 1 interferon production, leading to suppression of interferon-mediated antiviral responses. In the second mechanism, the immune evasion was found to be mediated by the suppressive cytokine interleukin 10 (IL-10). High levels of IL-10 activated expression of suppressor of cytokine signaling 3 gene, which subsequently inactivated the Janus kinase-signal transducer and activator of transcription pathway. Inhibition of IL-10 production by small interfering RNA down-regulated suppressor of cytokine signaling 3 gene expression, restored inducible nitric oxide synthase gene expression, and suppressed DENV replication. Importantly, we were able to demonstrate that these 2 loops of suppression occurred in patients with severe secondary dengue infection (dengue hemorrhagic fever) but not in patients with mild secondary dengue infection (dengue fever).
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in: SICRIS
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