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AIM2 activates the inflammasome and cell death in response to cytoplasmic DNA

 Teresa Fernandes-Alnemri  ;  Je-Wook Yu  ;  Jianghong Wu  ;  Pinaki Datta  ;  Emad S.Alnemri 
 NATURE, Vol.458(7237) : 509-513, 2009 
Journal Title
Issue Date
Animals ; Apoptosis Regulatory Proteins ; CARD Signaling Adaptor Proteins ; Caspase 1/metabolism ; Cell Death ; Cell Line ; Cytoplasm/genetics* ; Cytoskeletal Proteins/metabolism ; DNA/immunology ; DNA/metabolism* ; DNA-Binding Proteins ; Enzyme Activation ; Humans ; Inflammation/metabolism* ; Inflammation/pathology* ; Mice ; Nuclear Proteins/chemistry ; Nuclear Proteins/deficiency ; Nuclear Proteins/genetics ; Nuclear Proteins/metabolism* ; Protein Binding
Host- and pathogen-associated cytoplasmic double-stranded DNA triggers the activation of a NALP3 (also known as cryopyrin and NLRP3)-independent inflammasome, which activates caspase-1 leading to maturation of pro-interleukin-1beta and inflammation. The nature of the cytoplasmic-DNA-sensing inflammasome is currently unknown. Here we show that AIM2 (absent in melanoma 2), an interferon-inducible HIN-200 family member that contains an amino-terminal pyrin domain and a carboxy-terminal oligonucleotide/oligosaccharide-binding domain, senses cytoplasmic DNA by means of its oligonucleotide/oligosaccharide-binding domain and interacts with ASC (apoptosis-associated speck-like protein containing a CARD) through its pyrin domain to activate caspase-1. The interaction of AIM2 with ASC also leads to the formation of the ASC pyroptosome, which induces pyroptotic cell death in cells containing caspase-1. Knockdown of AIM2 by short interfering RNA reduced inflammasome/pyroptosome activation by cytoplasmic DNA in human and mouse macrophages, whereas stable expression of AIM2 in the non-responsive human embryonic kidney 293T cell line conferred responsiveness to cytoplasmic DNA. Our results show that cytoplasmic DNA triggers formation of the AIM2 inflammasome by inducing AIM2 oligomerization. This study identifies AIM2 as an important inflammasome component that senses potentially dangerous cytoplasmic DNA, leading to activation of the ASC pyroptosome and caspase-1.
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1. College of Medicine (의과대학) > Dept. of Microbiology (미생물학교실) > 1. Journal Papers
Yonsei Authors
Yu, Je Wook(유제욱) ORCID logo https://orcid.org/0000-0001-5943-4071
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