Unknown,Transcriptomics,Genomics,Proteomics

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Expression data from CD38high vs CD38low CD11b+Gr1+ splenocytes from tumor-bearing L2-Cre;p120f/f mice.

ABSTRACT: Myeloid derived suppressor cells (MDSCs) are an immunosuppressive population of immature myeloid cells found in advanced stage cancer patients and mouse tumor models. We have identified Cd38 gene as potentially playing an essential role in MDSC biology. To determine the diffences between CD38high and CD38 low MDSCs from tumor-bearing mice, we have conducted this microarray. In this dataset, we include the expression data obtained from sorted splenic CD38high CD11b+Gr1+ cells from tumor-bearing L2-Cre;p120f/f mice, compared to CD38low CD11b+Gr1+ cells from the same mice. Using these data, we have detected differential expression of 498 genes . The Nos2 gene was among the genes most upregulated in CD38high MDSCs. 8 total samples were analyzed: 3 pairs of CD38high and CD38 low MDSCs (coming from individual mice), as well a pair of CD38high and CD38low pulled MSDCs (splenocytes from 3 mice were pulled together for sorting to increase yields). Gene expression difference was determined by univariate test (two-sample t-test) with multivariate permutation test (10,000 random permutations). A cut-off p-value of less than 0.001 and minimum 2-fold expression change were used to identify genes with significant expression differences between the two groups.

ORGANISM(S): Mus musculus

SUBMITTER: Anil Rustgi

PROVIDER: E-GEOD-71705 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:The gene expression of murine splenic myeloid derived suppressor cells treated with Tff2 is characterized. The motivation of the study originates in the fact that Gr1+Cd11b+ myeloid-derived suppressor cells (MDSCs), which resemble immature myeloid cells (IMCs), expand during cancer in response to inflammatory cytokines and accumulate in the spleen. MDSCs promote neoplastic progression through their suppression of anti-tumourigenic cytotoxic T-cells. MDSCs are also rapidly expanded following acute insults, but in cancer as opposed to acute inflammation, MDSCs persist. It is now recognized that a vagally-mediated, anti-inflammatory reflex arc promoting acetylcholine secretion by Cd4+ (Cd44hiSelllo) T cells, is necessary for a return to homeostasis after an acute insult. Failure of this restorative neural circuit might contribute to unabated procarcinogenic inflammation, with the chronic expansion of MDSCs driving carcinogenesis. Trefoil factor 2 (Tff2) is a secreted anti-inflammatory peptide produced by both epithelial cells and a small subset of splenic T cell. In this study, we show that splenic Tff2 is induced in vagally-modulated memory T cells to suppress the expansion of MDSCs in response to chemical and carcinogenic injury. Deletion of Tff2 interrupts this anti-inflammatory neural arc and leads to expanded MDSCs and a dramatically increased incidence of colorectal cancer. Tff2 directly suppresses proliferation of myeloid progenitors, in a large part through upregulation of cell-bound Apolipoprotein E (ApoE), which has previously been shown to suppress proliferation of haematopoietic stem and progenitor cells. The predisposition to inflammation-associated cancer can be rescued through transgenic overexpression of splenic Tff2, adenoviral transfer of Tff2 expression or transplantation of Tff2-expressing haematopoietic cells. Thus, Tff2 production in memory T cells, is regulated by the vagus nerve, plays a central role in arresting procarcinogenic MDSC proliferation, and offers a novel approach to the prevention and treatment. A. Gr1+Cd11b+ splenic cells from Tff2-/- mice treated with Csf2 (n=4). B. Gr1+Cd11b+ splenic cells from Tff2-/- mice treated with Tff2 and Csf2 (n=4).

Dataset Information

Expression data from CD38high vs CD38low CD11b+Gr1+ splenocytes from tumor-bearing L2-Cre;p120f/f mice.

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