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- W4313382932 abstract "Abstract The transcription factor Runx1 is critical for T cell development and maturation. CD4-Cre Runx1 conditional knockout mice have a block in T cell maturation, leading to complement deposition on recent thymic emigrants, and leaving very few CD4+T cells in peripheral lymphoid organs. Interestingly, thymic- and splenic-derived T cells from CD4-Cre Runx1 cKO mice exhibit increased expression of markers indicative of anergy including FR4 and CD73, which is not seen in other genetically modified mice with a block in T cell maturation. These data suggest Runx1 plays a role in regulating the development of T cell anergy in CD4+T cells. We have generated a 1:1 mixed bone marrow chimera (BMC) system with Estrogen Receptor-Cre (ER-Cre) Runx1 conditional knockout and wild type B6.SJL bone marrow to delete Runx1 in mature CD4+ T cells. Upon tamoxifen treatment and deletion of Runx1, the ER-Cre Runx1 cKO CD4+ T cells spontaneously develop an anergic phenotype as they fail to proliferate upon TCR/CD28 stimulation, and co-express CD73 and FR4. This cell surface phenotype is cell intrinsic since wild type B6.SJL CD4+ T cells in the mixed bone marrow chimera do not upregulate CD73 and FR4 upon tamoxifen treatment. Surprisingly, the mixed BMC system reveals both the ER-Cre Runx1 cKO and the wild type B6.SJL peripheral T cells fail to proliferate in response to TCR/CD28 stimulation, suggesting Runx1 also regulates a cell-extrinsic suppressive mechanism controlling T cell tolerance. This cell-extrinsic induction of anergy requires Runx1-deficient CD4+ T cells, but it is not dependent on Runx1-deficient Tregs. Thus, Runx1 is a key regulator of T cell anergy, and further analysis of this BMC model will serve to uncover the mechanism." @default.
- W4313382932 created "2023-01-06" @default.
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- W4313382932 date "2019-05-01" @default.
- W4313382932 modified "2023-09-30" @default.
- W4313382932 title "Runx1 is a key regulator of T cell anergy" @default.
- W4313382932 doi "https://doi.org/10.4049/jimmunol.202.supp.56.15" @default.
- W4313382932 hasPublicationYear "2019" @default.
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