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TNF-R1 Co-opts TLR4 Pathway Components CD14, TRAM and TRIF to Drive TNF-Induced Inflammation and Toxicity

ABSTRACT: TNF-R1 Co-opts TLR4 Pathway Components CD14, TRAM and TRIF to Drive TNF-Induced Inflammation and Toxicity

PROVIDER: PRJNA870769 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR21120274.fastq.gz	Fastqsanger.gz
	SRR21120275.fastq.gz	Fastqsanger.gz
	SRR21120276.fastq.gz	Fastqsanger.gz
	SRR21120277.fastq.gz	Fastqsanger.gz
	SRR21120278.fastq.gz	Fastqsanger.gz

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TNF-R1 Co-opts TLR4 Pathway Components CD14, TRAM and TRIF to Drive TNF-Induced Inflammation and Toxicity

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Neutrophils and macrophages drive TNF-induced lethality via TRIF/CD14-mediated responses.

Project description:TNF mediates a variety of biological processes including cellular proliferation, inflammatory responses, and cell death and is therefore associated with numerous pathologies including autoinflammatory diseases and septic shock. The inflammatory and cell death responses to TNF have been studied extensively downstream of TNF-R1 and are believed to rely on the formation of proinflammatory complex I and prodeath complex II, respectively. We recently identified a similar multimeric complex downstream of TLR4, termed the TRIFosome, that regulates inflammation and cell death in response to LPS or Yersinia pseudotuberculosis. We present evidence of a role for the TRIFosome downstream of TNF-R1, independent of TLR3 or TLR4 engagement. Specifically, TNF-induced cell death and inflammation in murine macrophages were driven by the TLR4 adaptor TRIF and the LPS co-receptor CD14, highlighting an important role for these proteins beyond TLR-mediated immune responses. Via immunoprecipitation and visualization of TRIF-specific puncta, we demonstrated TRIF- and CD14-dependent formation of prodeath and proinflammatory complexes in response to TNF. Extending these findings, in a murine TNF-induced sepsis model, TRIF and CD14 deficiency decreased systemic inflammation, reduced organ pathology, and improved survival. The outcome of TRIF activation was cell specific, because TNF-induced lethality was mediated by neutrophils and macrophages responding to TNF in a TRIF-dependent manner. Our findings suggest that in addition to their crucial role in TNF production, myeloid cells are central to TNF toxicity and position TRIF and CD14 as universal components of receptor-mediated immune responses.

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In vitro responses of PBMC and fibroblasts from patients with TRIF deficiency after TRIF dependent and independent stimuli

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In vitro responses of PBMC and fibroblasts from patients with TRIF deficiency after TRIF dependent and independent stimuli

Project description:We report here unrelated HSE patients with autosomal recessive (AR) or autosomal dominant (AD) TRIF deficiency. The AR form of the disease is due to a homozygous nonsense mutation, resulting in a complete absence of the TRIF protein. Both the TLR3 and the TRIF-dependent TLR4 signaling pathways are abolished. The AD form of TRIF deficiency is due to a heterozygous missense mutation resulting in a dysfunctional protein. The TLR3 signaling pathway is impaired, whereas the TRIF-dependent TLR4 pathway is unaffected. Both patients however showed reduced capacity to respond to cytosolic double stranded RNA, consistent with recent reports of TRIF’s involvement in the DExD/H-box helicases pathway. Skin fibroblast cell lines were derived from healthy controls (n=3), patient with deficiencies for TRIF (n=1), MYD88 (n=1), and TLR3 (n=1) and cultured for 4 hours in the presence of IL1B (20ng/ml) or poly I:C (25ng/ml) or left unstimulated for the same length of time. PBMCs (previously frozen) collected from a healthy control (n=1) and patients with deficiencies for TRIF (n=1), and MYD88 (n=1) were cultured together with LPS (10ng/ml) or R848 (3ug/ml) for 2hrs or left unstimulated for the same length of time.

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