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J. Exp. Med.,
Volume 188, Number 11, December 7, 1998 2067-2074
By


From the * Laboratory of Molecular Immunology, National Heart, Lung, and Blood Institute,
National Institutes of Health, Bethesda, Maryland 20892-1674; the We have analyzed the immune system in Stat5-deficient mice. Although Stat5a
Division of Cell and Gene
Therapy, Center for Biologics Evaluation and Research, Food and Drug Administration, Bethesda,
Maryland 20892; the § Ministry of Agriculture and Forestry (Verification Agency), Te Kuiti, New
Zealand; and the ¶ Dairy Science Group, AgResearch, Ruakura, Hamilton, New Zealand
/
splenocytes
have a partial defect in anti-CD3-induced proliferation that can be overcome by high dose interleukin (IL)-2, we now demonstrate that defective proliferation in Stat5b
/
splenocytes cannot be corrected by this treatment. Interestingly, this finding may be at least partially explained
by diminished expression of the IL-2 receptor
chain (IL-2R
), which is a component of the
receptors for both IL-2 and IL-15, although other defects may also exist. Similar to the defect
in proliferation in activated splenocytes, freshly isolated splenocytes from Stat5b
/
mice exhibited greatly diminished proliferation in response to IL-2 and IL-15. This results from both a
decrease in the number and responsiveness of natural killer (NK) cells. Corresponding to the
diminished proliferation, basal as well as IL-2- and IL-15-mediated boosting of NK cytolytic
activity was also greatly diminished. These data indicate an essential nonredundant role for
Stat5b for potent NK cell-mediated proliferation and cytolytic activity.
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