| First Author | Franchi L | Year | 2009 |
| Journal | J Immunol | Volume | 183 |
| Issue | 2 | Pages | 792-6 |
| PubMed ID | 19542372 | Mgi Jnum | J:151503 |
| Mgi Id | MGI:4353957 | Doi | 10.4049/jimmunol.0900173 |
| Citation | Franchi L, et al. (2009) Cutting edge: TNF-alpha mediates sensitization to ATP and silica via the NLRP3 inflammasome in the absence of microbial stimulation. J Immunol 183(2):792-6 |
| abstractText | 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 prestimulation of phagocytic cells with microbial molecules is required for caspase-1 activation. We show here that exposure of macrophages and dendritic cells to TNF-alpha promotes ATP- or silica-mediated caspase-1 activation and IL-1beta secretion in the absence of microbial stimulation. The effect of TNF-alpha 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-alpha, IL-1alpha and IL-1beta promoted caspase-1 activation via Nlrp3 in response to ATP. Remarkably, macrophages tolerized to TNF-alpha, 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. |
