Noncanonical autophagy is required for type I interferon secretion in response to DNA-immune complexes.

Noncanonical autophagy is required for type I interferon secretion in response to DNA-immune complexes.
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DOI:
10.1016/j.immuni.2012.09.014
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发表时间:
2012-12-14
期刊:
影响因子:
32.4
通讯作者:
Sanjuan MA
Sanjuan MA
中科院分区:
医学1区
文献类型:
--
作者:
Henault J;Martinez J;Riggs JM;Tian J;Mehta P;Clarke L;Sasai M;Latz E;Brinkmann MM;Iwasaki A;Coyle AJ;Kolbeck R;Green DR;Sanjuan MA

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Toll-like receptor-9 (TLR9) is largely responsible for discriminating self from pathogenic DNA. However, association of host DNA with autoantibodies activates TLR9, inducing the pathogenic secretion of type I interferons (IFNs) from plasmacytoid dendritic cells (pDCs). Here, we found that in response to DNA-containing immune complexes (DNA-IC), but not to soluble ligands, IFN-α production depended upon the convergence of the phagocytic and autophagic pathways, a process called microtubule-associated protein 1A/1B-light chain 3 (LC3)-associated phagocytosis (LAP). LAP was required for TLR9 trafficking into a specialized interferon signaling compartment by a mechanism that involved autophagy-related proteins, but not the conventional autophagic preinitiation complex, or adaptor protein-3 (AP-3). Our findings unveil a new role for nonconventional autophagy in inflammation and provide one mechanism by which anti-DNA autoantibodies, such as those found in several autoimmune disorders, bypass the controls that normally restrict the apportionment of pathogenic DNA and TLR9 to the interferon signaling compartment.
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