Abstract:
:Constitutive cell-autonomous immunity in metazoans predates interferon-inducible immunity and comprises primordial innate defense. Phagocytes mobilize interferon-inducible responses upon engagement of well-characterized signaling pathways by pathogen-associated molecular patterns (PAMPs). The signals controlling deployment of constitutive cell-autonomous responses during infection have remained elusive. Vita-PAMPs denote microbial viability, signaling the danger of cellular exploitation by intracellular pathogens. We show that cyclic-di-adenosine monophosphate in live Gram-positive bacteria is a vita-PAMP, engaging the innate sensor stimulator of interferon genes (STING) to mediate endoplasmic reticulum (ER) stress. Subsequent inactivation of the mechanistic target of rapamycin mobilizes autophagy, which sequesters stressed ER membranes, resolves ER stress, and curtails phagocyte death. This vita-PAMP-induced ER-phagy additionally orchestrates an interferon response by localizing ER-resident STING to autophagosomes. Our findings identify stress-mediated ER-phagy as a cell-autonomous response mobilized by STING-dependent sensing of a specific vita-PAMP and elucidate how innate receptors engage multilayered homeostatic mechanisms to promote immunity and survival after infection.
journal_name
Celljournal_title
Cellauthors
Moretti J,Roy S,Bozec D,Martinez J,Chapman JR,Ueberheide B,Lamming DW,Chen ZJ,Horng T,Yeretssian G,Green DR,Blander JMdoi
10.1016/j.cell.2017.09.034subject
Has Abstractpub_date
2017-11-02 00:00:00pages
809-823.e13issue
4eissn
0092-8674issn
1097-4172pii
S0092-8674(17)31128-5journal_volume
171pub_type
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