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- W2142160158 abstract "Abstract Infection with antimony-resistant Leishmania donovani (SbRLD) induces aggressive pathology in the mammalian hosts as compared with ones with antimony-sensitive L. donovani (SbSLD) infection. SbRLD, but not SbSLD, interacts with TLR2/TLR6 to induce IL-10 by exploiting p50/c-Rel subunits of NF-κB in infected macrophages (Mϕs). Most of the TLRs exploit the universal adaptor protein MyD88 to activate NF-κB. We now show that infection of Mϕs from MyD88−/− mice with SbRLD gave rise to significantly higher intracellular parasite number coupled with elevated IL-10/IL-12 ratio in the culture supernatant as compared with infection in wild type (WT) Mϕs. Τhese attributes were not seen with SbSLD in similar experiments. Further, SbRLD infection upregulated miR-466i, which binds with 3′-untranslated region, leading to the downregulation of MyD88. Infection of MyD88−/− Mϕ or IL-12−/− Mϕ with SbRLD induced IL-10 surge at 4 h, whereas the same in WT Mϕ started from 12 h. Thus, absence of IL-12 in MyD88−/− mice favored early binding of NF-κB subunits to the IL-10 promoter, resulting in IL-10 surge. Infection of MyD88−/− mice with SbRLD showed significantly higher organ parasites coupled with ill-defined and immature hepatic granulomas, whereas in WT mice there were less organ parasites and the granulomas were well defined. From the survival kinetics it was observed that SbRLD-infected MyD88−/− mice died by 60 d postinfection, whereas the WT mice continued to survive. Our results demonstrate that SbRLD has evolved a unique strategy to evade host antileishmanial immune repertoire by manipulating host MyD88 to its advantage." @default.
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- W2142160158 date "2015-09-15" @default.
- W2142160158 modified "2023-10-16" @default.
- W2142160158 title "Antimony-Resistant<i>Leishmania donovani</i>Exploits miR-466i To Deactivate Host MyD88 for Regulating IL-10/IL-12 Levels during Early Hours of Infection" @default.
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- W2142160158 doi "https://doi.org/10.4049/jimmunol.1402585" @default.
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