Liposomal lipopolysaccharide initiates TRIF-dependent signaling pathway independent of CD14.

Liposomal lipopolysaccharide initiates TRIF-dependent signaling pathway independent of CD14.
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DOI:
10.1371/journal.pone.0060078
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发表时间:
2013
期刊:
影响因子:
3.7
通讯作者:
Inoue J
Inoue J
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Watanabe S;Kumazawa Y;Inoue J

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脂多糖(LPS)被具有Toll样受体4(TLR 4)的CD 14识别,并启动TLR 4信号传导的2个主要途径,MyD 88依赖性和TRIF依赖性信号传导途径。MyD 88依赖性通路通过激活NFκB和MAPK诱导炎症反应,如TNF-α、IL-6和IL-12的产生。TRIF依赖性途径通过激活IRF-3和NFκB诱导I型IFN和RANTES的产生,并且对于诱导适应性免疫应答也很重要。CD 14在启动对LPS的TRIF依赖性信号传导途径应答中起关键作用,以支持LPS通过内吞作用的内化。在这里,我们清楚地表明,细胞内传递LPS的LPS配制的脂质体(LPS脂质体)启动只有TRIF依赖性信号通过网格蛋白介导的内吞作用,独立于CD 14。事实上,LPS-脂质体不诱导TNF-α和IL-6的产生,但诱导腹腔巨噬细胞中RANTES的产生。此外,LPS-脂质体可以有效地诱导CD 14缺陷小鼠的适应性免疫应答。总的来说,我们的结果强烈表明,LPS-脂质体可用作基于TRIF依赖性信号传导的免疫佐剂,而不会诱导不必要的炎症。
Lipopolysaccharide (LPS) is recognized by CD14 with Toll-like receptor 4 (TLR4), and initiates 2 major pathways of TLR4 signaling, the MyD88-dependent and TRIF-dependent signaling pathways. The MyD88-dependent pathway induces inflammatory responses such as the production of TNF-α, IL-6, and IL-12 via the activation of NFκB and MAPK. The TRIF-dependent pathway induces the production of type-I IFN, and RANTES via the activation of IRF-3 and NFκB, and is also important for the induction of adaptive immune responses. CD14 plays a critical role in initiating the TRIF-dependent signaling pathway response to LPS, to support the internalization of LPS via endocytosis. Here, we clearly demonstrate that intracellular delivery of LPS by LPS-formulated liposomes (LPS-liposomes) initiate only TRIF-dependent signaling via clathrin-mediated endocytosis, independent of CD14. In fact, LPS-liposomes do not induce the production of TNF-α and IL-6 but induce RANTES production in peritoneal macrophages. Additionally, LPS-liposomes could induce adaptive immune responses effectively in CD14-deficient mice. Collectively, our results strongly suggest that LPS-liposomes are useful as a TRIF-dependent signaling-based immune adjuvant without inducing unnecessary inflammation.
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