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Mus musculus

ABSTRACT: Triggering of NOD2 receptor converts inflammatory Ly6Chigh into Ly6Clow monocytes with patrolling properties.

PROVIDER: PRJNA394681 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR5831460_1.fastq.gz	Fastqsanger.gz
	SRR5831460_2.fastq.gz	Fastqsanger.gz
	SRR5831470_1.fastq.gz	Fastqsanger.gz
	SRR5831470_2.fastq.gz	Fastqsanger.gz
	SRR5831461_1.fastq.gz	Fastqsanger.gz

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Triggering of NOD2 receptor converts inflammatory Ly6Chigh into Ly6Clow monocytes with patrolling properties.

Project description:In the present study, we demonstrate that NOD2 receptor triggering by muramyl dipeptide converts blood inflammatory Ly6Chigh monocytes into patrolling Ly6Clow monocytes. Muramyl dipeptide administration to Nr4a1-/- mice, which lack Ly6Clow monocytes, and to Ly6Clow-depleted mice leads to the emergence of blood patrolling monocytes expressing phenotypic profile of typical Ly6Clow monocytes, including high expression of CX3CR1 and LFA1. Furthermore using intravital microscopy in live animal models of inflammatory diseases, we observed that converted Ly6Chigh monocytes are capable of patrolling the endothelium of blood vessels and their presence contributes to reduce the inflammatory response following muramyl dipeptide injection.

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Identification of miR-146a target genes in mouse monocyte subsets

Project description:To gain insight into the mechanisms underlying miR-146a-mediated modulation of Ly6Chigh monocyte function, we compared the expression profiles of Ly6Chigh and Ly6Clow monocytes in miR-146a+/+ (WT) versus miR-146a-/- (KO) conditions.

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Project description:Murine monocytes (MC) are classified into Ly6Chigh and Ly6Clow MC. Ly6Chigh MC is the pro-inflammatory subset and the counterpart of human CD14++CD16+ intermediate MC which contributes to systemic and tissue inflammation in various metabolic disorders, including hyperhomocysteinemia (HHcy). This study aims to explore molecule signaling mediating MC subset differentiation in HHcy and control mice.Mouse white blood cell were prepared from peripheral blood and stained with antibody against CD11b, Ly6G and Ly6C and subjected for flow cytometry cell sorting. CD11b+Ly6G- cells were selected as MC. MC subsets (CD11b+Ly6G-Ly6Chigh, and CD11b+Ly6G-Ly6Clow) were sorted based on Ly6C levels. The quantification of MC was used flow cytometry analysis for Ly6Chigh and Ly6Clow MC in CT and Cbs-/-. Then, 100 ng mRNA were obtained from 100,000 sorted cells of CT and Cbs-/- (HHcy) mice. Around 30 million reads were achived and 16,487 normalized genes per sample by mRNA-Seq analysis.

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Project description:In rare instances, pediatric SARS-CoV2 infection results in a novel immunodysregulation syndrome termed multisystem inflammatory syndrome in children (MIS-C). We compared MIS-C immunopathology with that of severe COVID-19. MIS-C does not result in pneumocyte damage but is associated with vascular endothelitis, gastrointestinal epithelial injury and endotoxemia. In MIS-C, IFN dominates the inflammatory signature in contrast to type I interferons in severe COVID-19. While HLA-DRlo classical monocytes dominate severe COVID-19, patrolling monocyte activation characterize MIS-C. TIM-3 expression on activated CD4/CD8  T cells and on CD57+ NK cells is a distinctive MIS-C feature. In all MIS-C patients, single cell TCR profiling demonstrates a skewed TCR repertoire enriched for TRBV11-2 and a superantigenic signature which is absent in severe COVID-19. Using NicheNet, we confirm IFN as a central cytokine in the communication between activated T cells, NK cells and patrolling monocytes. Rapid normalization of IFN, TIM-3 loss on T cells and patrolling monocytes contraction upon treatment highlight their potential role in MIS-C immunopathogenesis.

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