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J. Exp. Med.,
Volume 188, Number 7, October 5, 1998 1369-1373
Chain/CD25 Promoter
Is a Target for Nuclear Factor of Activated T Cells
By


From the * Institute of Pathology, and the The expression of the murine interleukin (IL)-2 receptor
Institute of Virology and Immunobiology, University of
Würzburg, D-97080 Würzburg, Germany
chain/CD25 is strongly induced at
the transcriptional level after T cell activation. We show here that nuclear factor of activated T
cell (NF-AT) factors are involved in the control of CD25 promoter induction in T cells. NF-ATp and NF-ATc bind to two sites around positions
585 and
650 located upstream of the
proximal CD25 promoter. Immediately 3' from these NF-AT motifs, nonconsensus sites are
located for the binding of AP-1-like factors. Mutations of sites that suppress NF-AT binding
impair the induction and strong NF-ATp-mediated transactivation of the CD25 promoter in T cells. In T lymphocytes from NF-ATp-deficient mice, the expression of CD25 is severely
impaired, leading to a delayed IL-2 receptor expression after T cell receptor (TCR)/CD3 stimulation. Our data indicate an important role for NF-AT in the faithful expression of high affinity IL-2 receptors and a close link between the TCR-mediated induction of IL-2 and IL-2 receptor
chain promoters, both of which are regulated by NF-AT factors.
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