Defective IL-2-mediated IL-2 receptor alpha chain expression in Stat3-deficient T lymphocytes - PubMed (original) (raw)
Defective IL-2-mediated IL-2 receptor alpha chain expression in Stat3-deficient T lymphocytes
H Akaishi et al. Int Immunol. 1998 Nov.
Abstract
Stat3, a member of signal transducers and activators of transcription (STAT), is activated by a variety of cytokines. Recently, mice lacking Stat3 specifically in T cells have been generated and shown to be defective in IL-6-induced proliferation due to the impairment in IL-6-mediated prevention of apoptosis. In the present study, we show that Stat3-deficient T cells are partially defective in IL-2-induced proliferation. Stat3-deficient T cells show impaired IL-2-mediated IL-2 receptor (IL-2R) alpha chain expression. When Stat3-deficient T cells are stimulated with high-dose IL-2, these T cells express IL-2Ralpha and proliferate to similar extents as wild-type T cells. These demonstrate that Stat3 activation is required for efficient T cell proliferation by IL-2 through IL-2Ralpha induction. Taken together, these findings demonstrate that Stat3 activation in T cells is responsible for IL-2- and IL-6-induced proliferation through distinct mechanisms.
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