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Distinct Dictation of Japanese Encephalitis Virus-Induced Neuroinflammation and Lethality via Triggering TLR3 and TLR4 Signal Pathways


Japanese encephalitis (JE) is major emerging encephalitis, and more than 60% of global population inhabits JE endemic areas. The etiological virus is currently spreading to previously unaffected regions due to rapid changes in climate and demography. However, the impact of TLR molecules on JE progression has not been addressed to date. We found that the distinct outcomes of JE progression occurred in TLR3 and TLR4-dependent manner, i.e. TLR3−/− mice were highly susceptible, whereas TLR4−/− mice showed enhanced resistance to JE. TLR3 ablation induced severe CNS inflammation manifested by early CD11b+Ly-6Chigh monocyte infiltration, high expression of proinflammatory cytokines, as well as increased BBB permeability. In contrast, TLR4 ablation provided potent type I IFN innate response in infected mice, as well as in myeloid-derived cells closely associated with strong induction of antiviral ISG genes, and also resulted in enhanced humoral, CD4+, and CD8+ T cell responses along with altered plasmacytoid DC and CD4+Foxp3+ Treg number. Thus, potent type I IFN innate and adaptive immune responses in the absence of TLR4 were coupled with reduced JE lethality. Our studies provide an insight into the role of each TLR molecule on the modulation of JE, as well as its mechanism of neuroinflammation control during JE progression.


Vyšlo v časopise: Distinct Dictation of Japanese Encephalitis Virus-Induced Neuroinflammation and Lethality via Triggering TLR3 and TLR4 Signal Pathways. PLoS Pathog 10(9): e32767. doi:10.1371/journal.ppat.1004319
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1004319

Souhrn

Japanese encephalitis (JE) is major emerging encephalitis, and more than 60% of global population inhabits JE endemic areas. The etiological virus is currently spreading to previously unaffected regions due to rapid changes in climate and demography. However, the impact of TLR molecules on JE progression has not been addressed to date. We found that the distinct outcomes of JE progression occurred in TLR3 and TLR4-dependent manner, i.e. TLR3−/− mice were highly susceptible, whereas TLR4−/− mice showed enhanced resistance to JE. TLR3 ablation induced severe CNS inflammation manifested by early CD11b+Ly-6Chigh monocyte infiltration, high expression of proinflammatory cytokines, as well as increased BBB permeability. In contrast, TLR4 ablation provided potent type I IFN innate response in infected mice, as well as in myeloid-derived cells closely associated with strong induction of antiviral ISG genes, and also resulted in enhanced humoral, CD4+, and CD8+ T cell responses along with altered plasmacytoid DC and CD4+Foxp3+ Treg number. Thus, potent type I IFN innate and adaptive immune responses in the absence of TLR4 were coupled with reduced JE lethality. Our studies provide an insight into the role of each TLR molecule on the modulation of JE, as well as its mechanism of neuroinflammation control during JE progression.


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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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