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Interleukin-1β induces mitochondrial DAMP production to activate STING-dependent innate immune programs

ABSTRACT: Interleukin-1β induces mitochondrial DAMP production to activate STING-dependent innate immune programs

PROVIDER: PRJNA492336 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7885330.fastq.gz	Fastqsanger.gz
	SRR7885340.fastq.gz	Fastqsanger.gz
	SRR7885350.fastq.gz	Fastqsanger.gz
	SRR7885360.fastq.gz	Fastqsanger.gz
	SRR7885370.fastq.gz	Fastqsanger.gz

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Interleukin-1β induces mitochondrial DAMP production to activate STING-dependent innate immune programs

Project description:Here we report that exogenous IL-1β induces TBK1-mediated interferon regulatory factor 3 (IRF3) activation and autophagic flux in human myeloid and epithelial cells. IL-1β-induced innate immune activation is dependent upon the DNA sensing pathway adaptor, stimulator of interferon genes (STING), through the recognition of mitochondrial DNA by cyclic GMP-AMP synthase (cGAS). Thus, IL-1β potentiates pathogen-induced interferon production and signal transducer and activator of transcription (STAT) signaling to amplify innate immune responses.

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Interleukin-1β Induces mtDNA Release to Activate Innate Immune Signaling via cGAS-STING.

Project description:Interleukin-1 beta (IL-1β) is a pleiotropic mediator of inflammation and is produced in response to a wide range of stimuli. During infection, IL-1β production occurs in parallel with the onset of innate antimicrobial defenses, but the contribution of IL-1β signaling to cell-intrinsic immunity is not defined. Here, we report that exogenous IL-1β induces interferon regulatory factor 3 (IRF3) activation in human myeloid, fibroblast, and epithelial cells. IRF3 activation by IL-1β is dependent upon the DNA-sensing pathway adaptor, stimulator of interferon genes (STING), through the recognition of cytosolic mtDNA by cyclic guanosine monophosphate (GMP)-AMP synthase (cGAS). IL-1β treatment results in interferon (IFN) production and activation of IFN signaling to direct a potent innate immune response that restricts dengue virus infection. This study identifies a new function for IL-1β in the onset or enhancement of cell-intrinsic immunity, with important implications for cGAS-STING in integrating inflammatory and microbial cues for host defense.

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Inflammation-Driven Carcinogenesis is Mediated through STING [skin]

Project description:Chronic stimulation of innate immune pathways by microbial agents or damaged tissue is known to promote inflammation-driven tumorigenesis by unclarified mechanisms1-3. Here we demonstrate that mutagenic 7,12-dimethylbenz(a)anthracene (DMBA), etoposide or cisplatin induces nuclear DNA leakage into the cytosol to intrinsically activate STING (Stimulator of Interferon Genes) dependent cytokine production. Inflammatory cytokine levels were subsequently augmented in a STING-dependent extrinsic manner by infiltrating phagocytes purging dying cells. Consequently, STING-/- mice, or wild type mice adoptively transferred with STING-/- bone marrow, were almost completely resistant to DMBA-induced skin carcinogenesis compared to their wild type counterparts. Our data emphasizes, for the first time, a role for STING in the induction of cancer, sheds significant insight into the causes of inflammation-driven carcinogenesis, and may provide therapeutic strategies to help prevent malignant disease Total RNA obtained from DMBA or acetone treated wild type (WT) or STING deficient (SKO) mouse skin or skin tumor was examined for gene expression.

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STING induces LUBAC synthesis of linear ubiquitin chains to activate NFkB

Project description:STING activation by cyclic dinucleotides in mammals induces Type I Interferon- and NFkB-related gene expression, and the lipidation of LC3B at Golgi membranes. While the mechanisms of the Interferon-related responses are well understood, the mechanism of NFkB activation mediated by STING activation, and how the multi-functional responses downstream of STING signaling are related remain unknown. We report that STING activation induces K63 and linear ubiquitin chain formation, and ubiquitin co-localizes with STING and LC3B at Golgi-derived vesicles. Loss of the LUBAC E3 ubiquitin ligase subunit, HOIP, prevents formation of the linear, but not K63-linked, ubiquitin chains. The ubiquitin and LC3B binding proteins, Optineurin and TNIP1, are co-localized with STING activation-induced, perinuclear LC3B foci via their UBAN domains, however loss of HOIP does not influence this localization, indicating they may bind the K63-linked ubiquitin chains. HOIP-mediated linear ubiquitin chains are well established to mediate NFkB downstream of TNFa and IL1beta receptor stimulation. Loss of HOIP in monocytic THP-1 cells inhibits STING-induced NFkB activation and NFkB-related gene transcription, as well as Interferon-related transcription. Further, the recently reported proton channel activity of STING that blocks LC3B lipidation at Golgi membranes is also important for both K63 and Linear ubiquitin chain formation, and NFkB signaling. Thus, STING induces HOIP and linear ubiquitin chain formation to activate NFkB.

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