The protein ATG16L1 suppresses inflammatory cytokines induced by the intracellular sensors Nod1 and Nod2 in an autophagy-independent manner.

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

Immunity

journal_title

Immunity

authors

Sorbara MT,Ellison LK,Ramjeet M,Travassos LH,Jones NL,Girardin SE,Philpott DJ

doi

10.1016/j.immuni.2013.10.013

subject

Has Abstract

pub_date

2013-11-14 00:00:00

pages

858-73

issue

5

eissn

1074-7613

issn

1097-4180

pii

S1074-7613(13)00474-3

journal_volume

39

pub_type

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