TLR2 ligands induce NF-κB activation from endosomal compartments of human monocytes.

TLR2 ligands induce NF-κB activation from endosomal compartments of human monocytes.
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DOI:
10.1371/journal.pone.0080743
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
de Moerloose P
de Moerloose P
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Brandt KJ;Fickentscher C;Kruithof EK;de Moerloose P

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Toll样受体(TLR)定位于亚细胞器是调节先天性免疫应答的主要策略。虽然TLR 4是一种细胞表面受体,信号来自质膜和内体区室,但关于内体运输对TLR 2信号传导的功能作用知之甚少。在这里,我们表明,细菌TLR 2配体Pam 3CSK 4和LTA激活NF-κ B依赖性信号从人单核细胞和NF-κB敏感的报告细胞系的内体区室,尽管在细胞表面的TLR 2的表达。进一步的分析表明,TLR 2诱导的NF-κB活化受网格蛋白/动力蛋白依赖的内吞机制控制,其中CD 14作为重要的上游调节因子。这些发现证实了细胞表面TLR 2内化到核内体区室是NF-κB活化所必需的。这些观察结果进一步证明了内吞作用在TLR 2依赖性信号通路的激活和调节中的需要。
Localization of Toll-like receptors (TLR) in subcellular organelles is a major strategy to regulate innate immune responses. While TLR4, a cell-surface receptor, signals from both the plasma membrane and endosomal compartments, less is known about the functional role of endosomal trafficking upon TLR2 signaling. Here we show that the bacterial TLR2 ligands Pam3CSK4 and LTA activate NF-κB-dependent signaling from endosomal compartments in human monocytes and in a NF-κB sensitive reporter cell line, despite the expression of TLR2 at the cell surface. Further analyses indicate that TLR2-induced NF-κB activation is controlled by a clathrin/dynamin-dependent endocytosis mechanism, in which CD14 serves as an important upstream regulator. These findings establish that internalization of cell-surface TLR2 into endosomal compartments is required for NF-κB activation. These observations further demonstrate the need of endocytosis in the activation and regulation of TLR2-dependent signaling pathways.
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