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TLR9 signals after translocating from the ER to CpG DNA in the lysosome

机译:在溶酶体中从ER转运到CpG DNA后的TLR9信号

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Microbial DNA sequences containing unmethylated CpG dinucleotides activate Toll-like receptor 9 (TLR9). We have found that TLR9 is localized to the endoplasmic reticulum (ER) of dendritic cells (DCs) and macrophages. Because there is no precedent for immune receptor signaling in the ER, we investigated how TLR9 is activated. We show that CpG DNA binds directly to TLR9 in ligand-binding studies. CpG DNA moves into early endosomes and is subsequently transported to a tubular lysosomal compartment. Concurrent with the movement of CpG DNA in cells, TLR9 redistributes from the ER to CpG DNA–containing structures, which also accumulate MyD88. Our data indicate a previously unknown mechanism of cellular activation involving the recruitment of TLR9 from the ER to sites of CpG DNA uptake, where signal transduction is initiated.
机译:包含未甲基化的CpG二核苷酸的微生物DNA序列会激活Toll样受体9(TLR9)。我们发现TLR9定位于树突状细胞(DCs)和巨噬细胞的内质网(ER)。因为在ER中尚无免疫受体信号传导的先例,所以我们研究了TLR9是如何激活的。我们显示在配体结合研究中,CpG DNA直接与TLR9结合。 CpG DNA进入早期的内体,随后被转运至管状的溶酶体区室。与细胞中CpG DNA的移动同时,TLR9从ER重新分布到含有CpG DNA的结构,该结构也积累了MyD88。我们的数据表明以前未知的细胞激活机制涉及从ER募集TLR9到CpG DNA摄取位点,在此开始信号转导。

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