Journal
CELL
Volume 171, Issue 4, Pages 809-+Publisher
CELL PRESS
DOI: 10.1016/j.cell.2017.09.034
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Funding
- Icahn School of Medicine at Mount Sinai (ISMMS) seed funds
- Philippe Foundation
- NIH Intramural Research Program [1ZIAES10328601]
- NIH/NIA [AG041765, K99/R00]
- NIH [AI102964, AI119763, AI040646, DK072201, DK111862, AI095245, AI123284, AI127658]
- Leona M. and Harry B. Helmsley Charitable Trust
- Lupus Research Alliance
- Burroughs Wellcome Fund
- Leukemia & Lymphoma Society
- NIH/ORIP [S10OD010582]
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Constitutive cell-autonomous immunity in metazoans predates interferon-inducible immunity and comprises primordial innatedefense. Phagocytesmobilize 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 sho wthat 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.
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