Infection-induced 5'-half molecules of tRNAHisGUG activate Toll-like receptor 7.
Infection-induced 5'-half molecules of tRNAHisGUG activate Toll-like receptor 7.
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感染诱导的Trnahisgug的5 half分子激活类似收费的受体7。
DOI:
10.1371/journal.pbio.3000982
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发表时间:
2020-12
期刊:
影响因子:
9.8
通讯作者:
Kirino Y
中科院分区:
文献类型:
--
作者:
Pawar K;Shigematsu M;Sharbati S;Kirino Y
Toll-like receptors (TLRs) play a crucial role in the innate immune response. Although endosomal TLR7 recognizes single-stranded RNAs, their endogenous RNA ligands have not been fully explored. Here, we report 5′-tRNA half molecules as abundant activators of TLR7. Mycobacterial infection and accompanying surface TLR activation up-regulate the expression of 5′-tRNA half molecules in human monocyte-derived macrophages (HMDMs). The abundant accumulation of 5′-tRNA halves also occur in HMDM-secreted extracellular vehicles (EVs); the abundance of EV-5′-tRNAHisGUG half molecules is >200-fold higher than that of the most abundant EV-microRNA (miRNA). Sequence identification of the 5′-tRNA halves using cP-RNA-seq revealed abundant and selective packaging of specific 5′-tRNA half species into EVs. The EV-5′-tRNAHisGUG half was experimentally demonstrated to be delivered into endosomes in recipient cells and to activate endosomal TLR7. Up-regulation of the 5′-tRNA half molecules was also observed in the plasma of patients infected with Mycobacterium tuberculosis. These results unveil a novel tRNA-engaged pathway in the innate immune response and assign the role of “immune activators” to 5′-tRNA half molecules. Although Toll-like receptors (TLRs) play a crucial role in the innate immune response, their endogenous ligands have not been fully explored. This study identifies tRNA half-molecules as abundant TLR ligands which are upregulated upon infection by mycobacteria and activate TLR7.
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影响因子:
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通讯作者:
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16.6
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影响因子:
29.7
作者:
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通讯作者:
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影响因子:
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通讯作者:
Walker DH