Loss of TET2 and TET3 in Regulatory T Cells Unleashes Effector Function
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TET enzymes oxidize 5-methylcytosine to 5-hydroxymethylcytosine and other oxidized methylcytosines in DNA. Here we examine the role of TET proteins in regulatory T (Treg) cells. Tet2/3Foxp3 mice lacking Tet2 and Tet3 in Treg cells develop inflammatory disease, and Treg cells from these mice show altered expression of Treg signature genes and upregulation of genes involved in cell cycle, DNA damage and cancer. In littermate mice with severe inflammation, both CD4Foxp3 and CD4Foxp3 cells show strong skewing towards Tfh/Th17 phenotypes. Wild-type Treg cells in mixed bone marrow chimeras and in Tet2/3Foxp3 heterozygous female mice are unable to rescue the aberrant properties of Tet2/3Foxp3 Treg cells. Treg cells from Tet2/3Foxp3 mice tend to lose Foxp3 expression, and transfer of total CD4 T cells isolated from Tet2/3Foxp3 mice could elicit inflammatory disease in fully immunocompetent mice. Together, these data indicate that Tet2 and Tet3 are guardians of Treg cell stability and immune homeostasis.
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