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Cell Host Microbe. 2015 Mar 11;17(3):357-368. doi: 10.1016/j.chom.2015.01.006. Epub 2015 Feb 19.

Concerted activation of the AIM2 and NLRP3 inflammasomes orchestrates host protection against Aspergillus infection.

Author information

1
Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
2
Animal Resources Center and the Veterinary Pathology Core, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
3
Department of Medical Protein Research, VIB, 9000 Ghent, Belgium; Department of Biochemistry, Ghent University, 9000 Ghent, Belgium.
4
Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA. Electronic address: thirumala-devi.kanneganti@stjude.org.

Abstract

Invasive pulmonary aspergillosis is a leading cause of infection-associated mortality in immunocompromised individuals. Aspergillus fumigatus infection produces ligands that could activate inflammasomes, but the contribution of these host defenses remains unclear. We show that two inflammasome receptors, AIM2 and NLRP3, recognize intracellular A. fumigatus and collectively induce protective immune responses. Mice lacking both AIM2 and NLRP3 fail to confine Aspergillus hyphae to inflammatory foci, leading to widespread hyphal dissemination to lung blood vessels. These mice succumb to infection more rapidly than WT mice or mice lacking a single inflammasome receptor. AIM2 and NLRP3 activation initiates assembly of a single cytoplasmic inflammasome platform, composed of the adaptor protein ASC along with caspase-1 and caspase-8. Combined actions of caspase-1 and caspase-8 lead to processing of pro-inflammatory cytokines IL-1β and IL-18 that critically control the infection. Thus, AIM2 and NLRP3 form a dual cytoplasmic surveillance system that orchestrates responses against A. fumigatus infection.

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PMID:
25704009
PMCID:
PMC4359672
DOI:
10.1016/j.chom.2015.01.006
[Indexed for MEDLINE]
Free PMC Article

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