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Global chromatin accessibility of gene locus in CD4+ T cells activated with or without OX40 costimulation

ABSTRACT: Global chromatin accessibility of gene locus in CD4+ T cells activated with or without OX40 costimulation

PROVIDER: PRJNA471813 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR7175482_1.fastq.gz	Fastqsanger.gz
	SRR7175482_2.fastq.gz	Fastqsanger.gz
	SRR7175483_1.fastq.gz	Fastqsanger.gz
	SRR7175483_2.fastq.gz	Fastqsanger.gz

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Global chromatin accessibility of gene locus in CD4+ T cells activated with or without OX40 costimulation

Project description:OX40 is a T cell costimulatory molecule in the tumor necrosis factor receptor (TNFR) superfamily. Unlike other costimulatory molecules, OX40 is not expressed by naive T cells, but its expression is rapidly induced following T cell activation, and OX40 costimulation plays a critical role in cell survival, proliferation, and generation of memory cells. We used ATAC-seq to detail the chromatin accessibility of gene locus of activated CD4 T cells with or without OX40 costimulation in the presence of TGF-β1 and IL-2 and identified distinct classes of genes after OX40 costimulation.

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Expression data from C57/Bl6 Wt mice CD4+ T cells after activation with anti-CD3 plus Wt APC or OX40L-Tg APC

Project description:OX40 is a T cell costimulatory molecule in the tumor necrosis factor receptor (TNFR) superfamily. Unlike other costimulatory molecules, OX40 is not expressed by naive T cells, but its expression is rapidly induced following T cell activation, and OX40 costimulation plays a critical role in cell survival, proliferation, and generation of memory cells. We used microarrays to detail the global programme of gene expression of activated CD4 T cells underlying OX40 costimulation and identified distinct classes of up-regulated genes after OX40 costimulation.

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Gene expression analysis of Ox40-cre/ROSA-YFP CD4+ T cell subsets

Project description:An Ox40-cre allele was used for lineage marking of CD4 T cells. Naive T cells that had previously expressed OX40 demonstrated a partially activated phenotype that was distinct from that of the majority of naive T cells. These results are consistent with a minor subpopulation of naive T cells being dependent on strong signaling responses to thymic self ligands. Keywords: T cell population comparison. Characterization of a novel subpopulation of naive T cells. Four types of T cells were sorted from mice (naive, CD44lo, CD44hi and Treg).

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Project description:Regulatory T (Treg) maintain the tumor microenvironment in an immunosuppressive state preventing effective anti-tumor immune response. A possible strategy to overcome Treg cell suppression focuses on OX40, a costimulatory molecule expressed constitutively by Treg cells while induced in activated effector T (Teff) cells. OX40 stimulation by the agonist mAb OX86 inhibits Treg cell suppression and boosts Teff cell activation. Here we uncover the mechanisms underlying the therapeutic activity of OX86 treatment dissecting its distinct effects on Treg and on effector memory T (Tem) cells, which are the most abundant CD4+ populations strongly expressing OX40 at the tumor site. In response to OX86, tumor-infiltrating Treg cells produced significantly less interleukin 10 (IL-10), possibly in relation to a decrease in the transcription factor IRF1. Tem cells responded to OX86 by upregulating surface CD40L expression, providing a licensing signal to dendritic cells (DCs). The CD40L/CD40 axis was required for Tem cell-mediated in vitro DC maturation and in vivo DC migration. Accordingly, OX86 treatment was no longer therapeutic in CD40 KO mice. In conclusion, following OX40 stimulation, blockade of Treg cell suppression and enhancement of the Tem cell adjuvant effect both concurred to free DCs from immunosuppression and to activate the immune response against the tumor. Total RNA obtained from sorted mouse FoxP3-GFP+ Treg activated in vitro with anti-CD3 in the presence of an OX40-agonist mAb (OX86) or isotype control.

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RNASeq to identify the in vitro molecular signature of Ox40 signaling in conjunction with TCR signaling in CD4 T cells from NZB/W F1 Mice

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