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Department of Microbiology and Immunology and Walther Oncology Center, Indiana University School of Medicine, Indianapolis, IN 46202; and Walther Cancer Institute, Indianapolis, IN 46208
T lymphocyte growth is regulated by the cyclin-dependent kinase
inhibitor p27Kip1. Mice deficient in p27Kip1
have increased proliferative responses to multiple cytokines, including
IL-2, IL-4, and IL-12, but not to anti-CD3. In the absence of
p27Kip1, T cells proliferate faster than control cells, as
evidenced by increased [3H]thymidine uptake, increased
cell growth and division, and an increased number of cells in S phase.
Importantly, this regulation is specific for p27Kip1 in T
cells, because hyperproliferation of T cells from mice deficient in
p21Cip1/Waf1 was not observed. In vivo, there is an
expansion of activated/memory CD4+ cells in
p27Kip1-deficient mice before and after immunization.
Furthermore, Ag-stimulated spleen cells from immunized
p27Kip1-deficient mice demonstrated increased proliferative
responses to IL-2 and increased secretion of IFN-
. Although IL-4
stimulated proliferative responses are diminished in Stat6-deficient T
cells, activated T cells from mice doubly deficient in both
p27Kip1 and Stat6 recover normal proliferative responses to
IL-4. Together, these data firmly support a role for
p27Kip1 as a negative regulator of cytokine-stimulated T
cell growth.
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