Regulatory T cells become autoaggressive when Foxp3 is extinguished

Foxp3 expression is not stable and may be extinguished both in vitro and in vivo. Those regulatory T cells with "deleted" Foxp3 then convert into pro-inflammatory effector T cells.

The loss of Foxp3 in regulatory T cells under autoimmune conditions may result in the conversion of suppressor T cells into highly autoaggressive lymphocytes.

Regulatory T cells that become autoaggressive. Daniel Hawiger1 & Richard A Flavell2. Nature Immunology 10, 938 - 939 (2009).
T Lymphocytes
Image source: A scanning electron microscope (SEM) image of a single human lymphocyte. Wikipedia, public domain.

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