Cytosolic double-stranded RNA activates the NLRP3 inflammasome via MAVS-induced membrane permeabilization and K+ efflux
The nucleotide-binding oligomerization domain-like receptor pyrin domain-containing 3 (Nlrp3) inflammasome plays an important role in inflammation by controlling the maturation and secretion of the cytokines IL-1β and IL-18 in response to multiple stimuli including pore-forming toxins, particulate m...
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| Hauptverfasser: | , , , , , , , , , , |
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| Dokumenttyp: | Article (Journal) |
| Sprache: | Englisch |
| Veröffentlicht: |
15 September 2014
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| In: |
The journal of immunology
Year: 2014, Jahrgang: 193, Heft: 8, Pages: 4214-4222 |
| ISSN: | 1550-6606 |
| DOI: | 10.4049/jimmunol.1400582 |
| Online-Zugang: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.4049/jimmunol.1400582 Verlag, lizenzpflichtig, Volltext: https://www.jimmunol.org/content/193/8/4214 
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| Verfasserangaben: | Luigi Franchi, Tatjana Eigenbrod, Raúl Muñoz-Planillo, Ulas Ozkurede, Yun-Gi Kim, Arindam Chakrabarti, Michael Gale, Robert H. Silverman, Marco Colonna, Shizuo Akira, and Gabriel Núñez |
| Zusammenfassung: | The nucleotide-binding oligomerization domain-like receptor pyrin domain-containing 3 (Nlrp3) inflammasome plays an important role in inflammation by controlling the maturation and secretion of the cytokines IL-1β and IL-18 in response to multiple stimuli including pore-forming toxins, particulate matter, and ATP. Although the pathways activated by the latter stimuli lead to a decrease in intracellular K+ concentration, which is required for inflammasome activation, the mechanism by which microbial RNA activates Nlrp3, remains poorly understood. In this study, we found that cytosolic poly(I:C), but not total RNA from healthy macrophages, macrophages undergoing pyroptosis, or mitochondrial RNA, induces caspase-1 activation and IL-1β release through the Nlrp3 inflammasome. Experiments with macrophages deficient in Tlr3, Myd88, or Trif, indicate that poly(I:C) induces Nlrp3 activation independently of TLR signaling. Further analyses revealed that the cytosolic sensors Rig-I and melanoma differentiation-associated gene 5 act redundantly via the common adaptor mitochondrial antiviral signaling (Mavs) to induce Nlrp3 activation in response to poly(I:C), but not ATP or nigericin. Mechanistically, Mavs triggered membrane permeabilization and K+ efflux independently of the inflammasome which were required for poly(I:C)-induced Nlrp3 activation. We conclude that poly (I:C) activates the inflammasome through an Mavs-dependent surveillance pathway that converges into a common K+ lowering step in the cytosol that is essential for the induction of Nlrp3 activation. |
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| Beschreibung: | Gesehen am 08.07.2020 |
| Beschreibung: | Online Resource |
| ISSN: | 1550-6606 |
| DOI: | 10.4049/jimmunol.1400582 |