Unknown,Transcriptomics,Genomics,Proteomics

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Whole genome expression analysis of tumor regulatory T cells expressing interleukin-10

ABSTRACT: The tumor microenvironment contains high frequencies of inflammatory regulatory T (Treg) cells. These Treg exhibit superior regulatory function compared with those from other environments such as the spleen, partially due to expression of anti-inflammatory interleukin-10. In order to gain insight into the origins and functional roles of different Treg subsets, we used whole genome microarray analysis to characterize tumor IL-10+ and tumor IL-10- Treg subsets obtained from VERT-X reporter mice bearing transplantable tumors, along with total tumor Treg and spleen Treg from FoxP3-EGFP reporter mice. Few genes were found to differ between IL-10+ and IL-10- tumor Treg subsets (29 upregulated, 88 downregulated), suggesting a common origin of each Treg subset. The specific gene expression profile of IL-10+ tumor Treg was associated with the tumor microenvironment and absent from spleen Treg, suggesting it to be driven by components of the inflammatory tumor microenvironment. The IL-10+ tumor Treg gene expression profile displayed upregulation of genes associated with a higher activation state and greater effector function. Pooled MC38 tumor tissue from VERT-X or FoxP3-EGFP reporter mice were used to obtain IL10+ tumor Treg (VERT-X), IL10- tumor Treg (VERT-X) and total tumor Treg (FoxP3-EGFP). Spleens from tumor-free FoxP3-EGFP mice were used for spleen Treg. Three experiments for each population gave a total 12 RNA samples.

ORGANISM(S): Mus musculus

SUBMITTER: Charles Stewart

PROVIDER: E-GEOD-49380 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Regulatory T (Treg) cells play an important role in the induction and maintenance of peripheral tolerance. Treg cells also suppress a variety of other immune responses, including anti-tumor and alloimmune responses. We have previously reported that tumor-activated Treg cells express granzyme B and that granzyme B is important for Treg cell-mediated suppression of anti-tumor immune responses (GSE13409). Here, we report that allogeneic mismatch also induces the expression of granzyme B. Granzyme B-deficient mice challenged with fully mismatched allogeneic P815 mastocytoma cells have markedly improved survival compared to WT and other granzyme- or perforin-deficient mice, suggesting an immunoregulatory role for granzyme B in this setting. Treg cells harvested from the tumor environment of P815-challenged mice express granzyme B. Treg cells also express granzyme B in vitro during mixed lymphocyte reactions and in vivo in a mouse model of graft-versus-host disease (GVHD). However, in contrast to findings from our previously published tumor model, granzyme B is not required for the suppression of effector T cell (Teff) proliferation in in vitro Treg suppression assays stimulated by either Concanavalin A or allogeneic antigen presenting cells. Additionally, in an ex vivo assay, sort-purified in vivo-activated CD4+Foxp3+ Treg cells from mice with active GVHD -- under conditions known to induce granzyme B expression in Treg cells -- suppressed Teff cell proliferation in a granzyme B-independent manner. Adoptive transfer of naive granzyme B-deficient CD4+CD25+ Treg cells into a mouse model of GVHD rescued hosts from lethatlity equivalently to naive wild-type Treg cells. Serum analysis of GVHD-associated cytokine production in these recipients also demonstrated that Treg cells suppressed production of IL-2, IL-4, IL-5, GM-CSF, and IFN-gamma in a granzyme B-independent manner. In order to determine whether the context in which Treg cells are activated alters the intrinsic properties of Treg cells, we used Foxp3 reporter mice to obtain gene expression profiles of CD4+Foxp3+ Treg cells purifed from naive resting spleens, spleens from mice with acute GVHD, and from ascites fluid of mice challenged intraperitoneally with allogeneic P815 tumor cells. Unsupervised analyses revealed distinct activation signatures of Treg cells among the 3 experimental groups. Taken together, these findings demonstrate that granzyme B is not required for Treg cell-mediated suppression of GVHD, which is in contrast to what we have previously reported for Treg cell function in the setting of tumor challenge. Cell intrinsic differences could partially account for these differential phenotypes. These data also suggest the therapeutic potential of targeting specific Treg cell suppressive functions in order to segregate GVHD and graft-versus-tumor effector functions. Experiment Overall Design: Six replicates of Naive CD4+Foxp3+ Treg cells were purified from resting spleens, five replicates of allogeneic tumor-activated Treg cells and three samples of GVHD-activated Treg cells. Experiment Overall Design: Naive reps 1-3 are controls for the GVHD-activated samples. Experiment Overall Design: Naive reps 4-6 are controls for the Allogeneic tumor-activated samples.

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Whole genome expression analysis of tumor regulatory T cells expressing interleukin-10

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