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J. Exp. Med.,
Volume 187, Number 6, March 16, 1998 967-972
/
+ (NK1+ T) Cells,
Natural Killer Cells, and Intestinal Intraepithelial T Cells
By




From the * Ontario Cancer Institute, Departments of Medical Biophysics and Immunology, Toronto,
Ontario, Canada, M5G 2M9; and the In contrast to conventional T cells, natural killer (NK) 1.1+ T cell receptor (TCR)-
Amgen Institute, Toronto, Ontario, Canada, M5G 2C1
/
+
(NK1+T) cells, NK cells, and intestinal intraepithelial lymphocytes (IELs) bearing CD8-
/
chains constitutively express the interleukin (IL)-2 receptor (R)
/15R
chain. Recent studies
have indicated that IL-2R
/15R
chain is required for the development of these lymphocyte
subsets, outlining the importance of IL-15. In this study, we investigated the development of
these lymphocyte subsets in interferon regulatory factor 1-deficient (IRF-1
/
) mice. Surprisingly, all of these lymphocyte subsets were severely reduced in IRF-1
/
mice. Within CD8-
/
+ intestinal IEL subset, TCR-
/
+ cells and TCR-
/
+ cells were equally affected by
IRF gene disruption. In contrast to intestinal TCR-
/
+ cells, thymic TCR-
/
+ cells developed normally in IRF-1
/
mice. Northern blot analysis further revealed that the induction of
IL-15 messenger RNA was impaired in IRF-1
/
bone marrow cells, and the recovery of
these lymphocyte subsets was observed when IRF-1
/
cells were cultured with IL-15 in
vitro. These data indicate that IRF-1 regulates IL-15 gene expression, which may control the
development of NK1+T cells, NK cells, and CD8-
/
+ IELs.
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