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* Center for Immunology, Cancer Center, Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455;
Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104; and
Department of Infection and Immunity, University of Wales College of Medicine, Cardiff, Wales, United Kingdom
Using transgenic mice that express a constitutively active version of STAT5b, we demonstrate that STAT5 plays a key role in governing B cell development and T cell homeostasis. STAT5 activation leads to a 10-fold increase in pro-B, but not pro-T, cells. Conversely, STAT5 signaling promotes the expansion of mature 
T cells (6-fold increase) and 
and NK T cells (3- to 4-fold increase), but not of mature B cells. In addition, STAT5 activation has dramatically divergent effects on CD8+ vs CD4+ T cells, leading to the selective expansion of CD8+ memory-like T cells and CD4+CD25+ regulatory T cells. These results establish that activation of STAT5 is the primary mechanism underlying both IL-7/IL-15-dependent homeostatic proliferation of naive and memory CD8+ T cells and IL-2-dependent development of CD4+CD25+ regulatory T cells.
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