Abstract
FoxP3(+) regulatory T (Treg) cells comprise a highly dynamic population that restrains autoreactivity. Although complete or long-term depletion of Foxp3(+) CD4(+) Treg cells in adult mice has been shown to result in chronic inflammation and autoimmune disease, the impact of transient Treg-cell depletion on self-reactive responses is poorly defined. A new study published in this issue of the European Journal of Immunology [Eur. J. Immunol. 2014. 44: 3621-3631] shows that, although transient depletion of Treg cells in mice is swiftly followed by recovery of Treg-cell numbers, the "rebounded" population fails to maintain tolerance, culminating in severe autoimmune gastritis. This commentary explores new questions about the quantitative and qualitative aspects of Treg-cell function in immunological tolerance raised by this study and others.
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