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Metabolomics,Unknown,Transcriptomics,Genomics,Proteomics

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Natural killer cell sensing of infected cells compensates deficient Toll-like receptor but not IFN-I activity for mouse resistance to cytomegalovirus

ABSTRACT: Plasmacytoid dendritic cells (pDC) are the major source of type I IFN (IFN-I) in vivo during Murine Cytomegalovirus (MCMV) infection. This response requires pDC-intrinsic MyD88-dependent signaling by Toll Like Receptors 7/9. Provided that they express appropriate recognition receptors such as Ly49H, Natural Killer (NK) cells can directly sense and kill MCMV-infected cells. While MyD88- and Ly49H-dependent responses can contribute to MCMV control, the objective is to understand the relative importance of these 3 mechanisms. In order to decipher the relative impact of MyD88- and Ly49H-dependent mechanisms during MCMV infection, we performed a genome-wide expression analysis on total spleen of Ly49H-/-MyD88+/+, Ly49H-/-MyD88-/-, Ly49H+/+MyD88+/+ and Ly49H+/+MyD88-/- BALB/c mice at different time points after MCMV infection (d0, d1,5, d2, d3 and d6). This study includes data from the spleen BALB/c mice, under steady-state or MCMV condition at different time points. 2 to 5 mice for each mouse strain for each time point were used, and were hybridized on 5 separate batches of gene chips.

ORGANISM(S): Mus musculus

SUBMITTER: Marc DALOD

PROVIDER: E-GEOD-62729 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Natural killer cell sensing of infected cells compensates deficient Toll-like receptor but not IFN-I activity for mouse resistance to cytomegalovirus

Project description:Plasmacytoid dendritic cells (pDC) are the major source of type I IFN (IFN-I) in vivo during Murine Cytomegalovirus (MCMV) infection. This response requires pDC-intrinsic MyD88-dependent signaling by Toll Like Receptors 7/9. Provided that they express appropriate recognition receptors such as Ly49H, Natural Killer (NK) cells can directly sense and kill MCMV-infected cells. While MyD88- and Ly49H-dependent responses can contribute to MCMV control, the objective is to understand the relative importance of these 3 mechanisms. In order to decipher the relative impact of MyD88- and Ly49H-dependent mechanisms during MCMV infection, we performed a genome-wide expression analysis on total spleen of Ly49H-/-MyD88+/+, Ly49H-/-MyD88-/-, Ly49H+/+MyD88+/+ and Ly49H+/+MyD88-/- BALB/c mice at different time points after MCMV infection (d0, d1,5, d2, d3 and d6).

2015-04-24 | GSE62729 | GEO

Dissecting cell-intrinsic roles of MyD88 and IFN-I signalling in pDC responses to a viral infection in vivo

Project description:Plasmacytoid dendritic cells (pDC) are the major source of type I interferons (IFN-I) during viral infections, in response to triggering of endosomal Toll Like Receptors (TLR) 7 or 9 by viral single-stranded RNA or unmethylated CpG DNA, respectively. IFN-I production in pDC occurs in specialized endosomes encompassing preformed signaling complexes of TLR7 or 9 with their adaptor molecule MyD88 and the transcription factor interferon regulatory factor 7 (IRF7). The triggering of TLR leads to IRF7 phosphorylation, nuclear translocation and binding to the promoters of the genes encoding IFN-I to initiate their transcription. pDC express uniquely high levels of IRF7 at steady state and this expression is further enhanced by positive IFN-I feedback signaling during viral infections. However, the specific cell-intrinsic roles of MyD88 versus IFN-I signaling in pDC responses to a viral infection have not been rigorously dissected. To achieve this aim, we generated mixed bone marrow chimera mice (MBMC) allowing to rigorously compare the gene expression profiles of WT versus Ifnar1-KO or MyD88-KO pDC isolated from the same animals at steady state or after infection with the mouse cytomegalovirus (MCMV). Our results indicate that, in vivo during MCMV infection, pDC undergo a major transcriptional reprogramming, under combined instruction of IFN-I, IFN-γ and direct TLR triggering. However, these different stimuli drive specific, largely distinct, gene expression programs. We rigorously determined which gene modules require cell-intrinsic IFN-I signaling for their induction in pDC during a physiological viral infection in vivo. We delineated non-redundant versus shared versus antagonistic responses with IFN-γ. We demonstrated that cell-intrinsic IFN-I responsiveness is dispensable for induction of the expression of all IFN-I/III genes and many cytokines or chemokines in pDC during MCMV infection, contrary to MyD88 signaling.

2018-10-05 | GSE107876 | GEO

Dissecting the molecular programs governing interferon production by plasmacytoid dendritic cells during a viral infection in vivo

Project description:Plasmacytoid dendritic cells (pDC) are the major source of type I and type III interferons (IFN-I/III) during viral infections, in response to triggering of endosomal Toll Like Receptors (TLRs) 7 or 9 by viral single-stranded RNA or unmethylated CpG DNA, respectively. Interestingly, this function is restricted to a minor fraction of pDC (Zucchini et al. Int. Immunol. 2008). In this project, we aimed at identifying the molecular pathways involved in inducing IFN-I/III production in this minor faction of pDC during in vivo infection by the mouse cytomegalovirus (MCMV). To achive this goal, we infected with MCMV Ifnb1Eyfp mice, in which IFN-producing pDC can be detected by YFP expression (Scheu et al. PNAS 2008). Thanks to this model, we were able to sort three distinct subsets of pDC: CD86-YFP- (not activated, non IFN-producing), CD86+YFP- (activated, non IFN-producing) and CD86+YFP+ (activated, IFN-producing) and to perform microarray analysis. This allowed us to select genes differentially expressed among these three subsets and to mine these data in order to identify the related signaling pathways.

2020-07-07 | GSE150664 | GEO

A commensal Clostridium bacteria restricts alphavirus dissemination through a bile acid-type I IFN signaling axis

Project description:The emerging alphavirus chikungunya virus (CHIKV) has infected millions of people. However, the factors modulating disease outcome remain poorly understood. We show that depletion of the gut microbiota in oral antibiotic-treated or germ-free mice leads to greater CHIKV infection and spread within one day of virus inoculation. Perturbation of the gut microbiota alters TLR7-MyD88 signaling in plasmacytoid dendritic cells (pDCs) and blunts systemic production of type I interferon (IFN). Consequently, circulating monocytes express fewer IFN-stimulated genes and become permissive for CHIKV infection. Reconstitution with a single commensal bacterial species, Clostridium scindens, or its derived metabolite, the bile acid deoxycholic acid, can restore pDC- and MyD88-dependent type I IFN responses to restrict systemic CHIKV infection and transmission back to vector mosquitoes. Thus, commensal gut bacteria modulate antiviral immunity and levels of circulating alphaviruses within hours of infection through a bile acid-pDC-IFN signaling axis, which affects virus dissemination and potentially, epidemic spread 3 biological replicates were processed per time point and group

2020-06-09 | GSE152043 | GEO

A commensal Clostridium bacteria restricts alphavirus dissemination through a bile acid-type I IFN signaling axis

2020-05-13 | GSE150387 | GEO

Single-cell analysis of mouse plasmacytoid dendritic cells (pDCs) unravels their activation trajectory and their molecular regulation in vivo during a viral infection [FB5P-seq_C57Bl6]

Project description:The aim of the project is to understand the heterogeneity of murine plasmacytoid dendritic cells (pDC) for interferon I production. For this end we want to perform RNAseq on splenic pDC at ground state and also after infection of mice with MCMV at different time points.

2020-07-07 | GSE151244 | GEO

Genome-wide expression study of the responses of murine NK cells and dendritic cell subsets to MCMV infection

Project description:Murine Cytomegalovirus (MCMV) infection leads to the activation of various immune cells, including dendritic cells (DCs) and Natural Killer (NK) cells. This activation is partly driven by innate cytokines including IFN-I, which are induced early after infection. The objective was to address the role of different innate cytokines in shaping DC subsets and NK cell responses, in particular the role of cell intrinsic responses to IFN-I. In order to decipher the specific impact of cell-intrinsic IFN-I on cell subsets, we performed a genome-wide expression analysis on CD45.1 WT and CD45.2 IFNAR-/- splenic conventional DC (cDC) subsets and NK cells isolated from C57BL/6 [CD45.1 WT / CD45.2 IFNAR-KO] mixed bone marow chimera mice. This study includes data from cDC subsets (CD8a and CD11b) and NK cells purified by flow cytometry sorting from the spleen of bone marrow chimera (BMC) mice, under steady-state or MCMV condition. Two independent replicates were made for each cell type, from two independent pools of spleens from uninfected or d1.5 MCMV-infected BMC 5-8 mice, and were hybridized on 3 separate batches of gene chips.

2012-10-17 | E-GEOD-39555 | biostudies-arrayexpress

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Project description:Murine Cytomegalovirus (MCMV) infection leads to early activation of various immune cells, including B and T lymphocytes, before the actual initiation of antigen-specific adaptive immunity. This activation is partly driven by innate cytokines, including type I interferon (IFN), which are induced early after infection. The objective of this study was to address the role of type I IFN in shaping early/innate B and T cell responses to a primary acute viral infection. In order to decipher the specific impact of IFN-I on cell subsets, we performed a genome-wide expression analysis on WT splenic B and CD8 T lymphocytes isolated from C57BL/6 [CD45.1 WT / CD45.2 IFNAR-KO] mixed bone marrow chimera mice. This study complements series GSE39555, which focused on early responses of NK cells and of the two subsets of conventional dendritic cells. This study includes data from B and CD8 T lymphocytes purified by flow cytometry sorting from the spleen of bone marrow chimera (BMC) mice, under steady-state or MCMV conditions. Two independent replicates were made for each cell type, from two independent pools of spleens from uninfected or d1.5 MCMV-infected BMC 5-8 mice, and were hybridized on 3 separate batches of GeneChips.

2013-04-03 | E-GEOD-45365 | biostudies-arrayexpress

Single cell RNA sequencing-based comparison of mouse splenic pDC, pDC-like cells, tDC, cDC1 and cDC2 at steady state and during a viral infection

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