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:
影响因子:
--
通讯作者:
Núñez G
中科院分区:
文献类型:
--
作者:
Franchi L;Eigenbrod T;Núñez G
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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DOI:
10.1073/pnas.0709684105
发表时间:
2008-06-10
影响因子:
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作者:
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通讯作者:
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