Abstract:
:The peptidoglycan sensor Nod2 and the autophagy protein ATG16L1 have been linked to Crohn's disease (CD). Although Nod2 and the related sensor, Nod1, direct ATG16L1 to initiate anti-bacterial autophagy, whether ATG16L1 affects Nod-driven inflammation has not been examined. Here, we uncover an unanticipated autophagy-independent role for ATG16L1 in negatively regulating Nod-driven inflammatory responses. Knockdown of ATG16L1 expression, but not that of ATG5 or ATG9a, specifically enhanced Nod-driven cytokine production. In addition, autophagy-incompetent truncated forms of ATG16L1 regulated Nod-driven cytokine responses. Mechanistically, we demonstrated that ATG16L1 interfered with poly-ubiquitination of the Rip2 adaptor and recruitment of Rip2 into large signaling complexes. The CD-associated allele of ATG16L1 was impaired in its ability to regulate Nod-driven inflammatory responses. Overall, these results suggest that ATG16L1 is critical for Nod-dependent regulation of cytokine responses and that disruption of this Nod1- or Nod2-ATG16L1 signaling axis could contribute to the chronic inflammation associated with CD.
journal_name
Immunityjournal_title
Immunityauthors
Sorbara MT,Ellison LK,Ramjeet M,Travassos LH,Jones NL,Girardin SE,Philpott DJdoi
10.1016/j.immuni.2013.10.013subject
Has Abstractpub_date
2013-11-14 00:00:00pages
858-73issue
5eissn
1074-7613issn
1097-4180pii
S1074-7613(13)00474-3journal_volume
39pub_type
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