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RNA-seq analyses of STAT1-delta IEC ApcMin (n=3) and STAT1-flox/flox ApcMin (n=3) mice

ABSTRACT: RNA-seq analyses of STAT1-delta IEC ApcMin (n=3) and STAT1-flox/flox ApcMin (n=3) mice

PROVIDER: PRJEB37570 | ENA |

REPOSITORIES: ENA

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RNA-seq analyses of STAT1-delta IEC ApcMin (n=3) and STAT1-flox/flox ApcMin (n=3) mice

Project description:The interferon-inducible transcription factor STAT1 is a tumor suppressor in various malignancies. We investigated STAT1 functions in intestinal tumorigenesis of ApcMin mice. Surprisingly, loss of STAT1 in intestinal epithelial cells (STAT1ΔIEC) interfered with ApcMin induced intestinal tumor formation and tumor progression. RNASeq data demonstrated reduced expression of Indoleamine-2,3-dioxygenase-1 (IDO1) in STAT1ΔIEC ApcMin tumors. IDO1 is implicated in synthesis of kynurenine, a metabolite that induces ß-Catenin nuclear localisation and suppresses anti-tumor immune responses.

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Transcriptome Analyses of Pulmonary Interstitial Macrophages derived from Hypoxic Cx3cr1cre;Hif1α (Δ/Δ) vs. Hif1fα (flox/flox) Mice

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Expression profile of WT and IKKb(EE)IEC epithelial cells (IEC)

Project description:To investigate NF-kB-driven gene expression in IEC, we performed microarray analysis from enterocytes of mice that express a constitutively active form of IKKb in intestinal epithelial cells Total RNA was prepared from enterocytes obtained from small intestines of IKKb(EE)IEC and WT littermates. Two biological replicates were performed for each experimental condition.

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Project description:Mast cells have been suggested to either promote or suppress tumor progression but the mechanisms underlying these outcomes are unclear. Here, we show that mice with a heterozygous mutation in the adenomatous polyposis coli gene (ApcMin/+) displayed reduced intestinal tumor burden and increased survival in the background of the chemokine decoy receptor ACKR2 deficiency (ACKR2-/-). The ACKR2-/-ApcMin/+ tumors showed increased infiltration of mast cells. In mast cell-deficient Sash (c-kitW-sh/W-sh) ACKR2-/-ApcMin/+ mice the survival advantage was lost as the tumors grew rapidly and adoptive transfer of mast cells reduced the tumor burden in these mice. The tumor burden is also increased in Rag2-/-ACKR2-/-ApcMin/+ mice and the protection is reconstituted by adoptively transferred CD8+ T-lymphocytes. Mast cells from ACKR2-/- mice expressed elevated levels of chemokine receptors CCR2 and CCR5 and are also efficient in antigen presentation and activation of CD8+ T-cells. Mast cell-derived leukotriene B4 is a critical mediator of CD8+ T-lymphocyte recruitment as the BLT1-/-ACKR2-/-ApcMin/+ mice are highly susceptible to intestinal tumor induced mortality. Taken together, these data demonstrate that chemokine mediated mast cell recruitment is essential for initiating LTB4/BLT1 regulated CD8+ T-cell homing and generation of effective anti-tumor immunity against intestinal tumor development.

2017-12-31 | GSE104829 | GEO

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