Title |
HIN-200 Proteins Regulate Caspase Activation in Response to Foreign Cytoplasmic DNA
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Published in |
Science, January 2009
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DOI | 10.1126/science.1169841 |
Pubmed ID | |
Authors |
Tara L. Roberts, Adi Idris, Jasmyn A. Dunn, Greg M. Kelly, Carol M. Burnton, Samantha Hodgson, Lani L. Hardy, Valerie Garceau, Matthew J. Sweet, Ian L. Ross, David A. Hume, Katryn J. Stacey |
Abstract |
The mammalian innate immune system is activated by foreign nucleic acids. Detection of double-stranded DNA (dsDNA) in the cytoplasm triggers characteristic antiviral responses and macrophage cell death. Cytoplasmic dsDNA rapidly activated caspase 3 and caspase 1 in bone marrow-derived macrophages. We identified the HIN-200 family member and candidate lupus susceptibility factor, p202, as a dsDNA binding protein that bound stably and rapidly to transfected DNA. Knockdown studies showed p202 to be an inhibitor of DNA-induced caspase activation. Conversely, the related pyrin domain-containing HIN-200 factor, AIM2 (p210), was required for caspase activation by cytoplasmic dsDNA. This work indicates that HIN-200 proteins can act as pattern recognition receptors mediating responses to cytoplasmic dsDNA. |
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