Cutting edge: TNF-alpha mediates sensitization to ATP and silica via the NLRP3 inflammasome in the absence of microbial stimulation.

Cutting edge: TNF-alpha mediates sensitization to ATP and silica via the NLRP3 inflammasome in the absence of microbial stimulation.
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DOI:
10.4049/jimmunol.0900173
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发表时间:
2009-07-15
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Núñez G
Núñez G
中科院分区:
其他
文献类型:
--
作者:
Franchi L;Eigenbrod T;Núñez G

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Nlrp 3炎性小体对于响应危险信号和颗粒物质的caspase-1的激活至关重要。然而,它在无菌炎症中的作用仍然不清楚,因为用微生物分子预刺激吞噬细胞是半胱天冬酶-1激活所必需的。我们发现,在没有微生物刺激的情况下,巨噬细胞和树突状细胞暴露于TNF-α促进ATP或二氧化硅介导的caspase-1活化和IL-1β分泌。TNF-α的作用在TNF受体I和II、Nlrp 3或ASC缺陷的巨噬细胞中被消除,而TLR配体诱导的作用需要MyD 88/Trif。除TNF-α外,IL-1α和IL-1β也可通过Nlrp 3促进caspase-1的活化。值得注意的是,对TNF-α耐受但对LPS不耐受的巨噬细胞通过Nlrp 3保持对ATP刺激的完全敏感性。这些结果提供了一种机制,通过该机制,危险信号和颗粒物质在没有微生物感染的情况下经由Nlrp 3炎性体介导炎症。
The Nlrp3 inflammasome is critical for the activation of caspase-1 in response to danger signals and particulate matter. However, its role in sterile inflammation remains unclear because pre-stimulation of phagocytic cells with microbial molecules is required for caspase-1 activation. We show here that exposure of macrophages and dendritic cells to TNF-α promotes ATP- or silica-mediated caspase-1 activation and IL-1β secretion in the absence of microbial stimulation. The effect of TNF-α was abolished in macrophages deficient in TNF receptor I and II, Nlrp3 or ASC whereas that induced by TLR ligands required MyD88/Trif. In addition to TNF-α, IL-1α and IL-1β promoted caspase-1 activation via Nlrp3 in response to ATP. Remarkably, macrophages tolerized to TNF-α, but not to LPS, retained full sensitivity to ATP stimulation via Nlrp3. These results provide a mechanism by which danger signals and particulate matter mediate inflammation via the Nlrp3 inflammasome in the absence of microbial infection.
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