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J. Exp. Med.
© The Rockefeller University Press
0022-1007/97/02/499/08 $2.00
Volume 185 February 1997 499-506

Abnormal Development of Intestinal Intraepithelial Lymphocytes and Peripheral Natural Killer Cells in Mice Lacking the IL-2 Receptor beta  Chain

By Haruhiko Suzuki,Dagger § Gordon S. Duncan,* Hiroaki Takimoto,Dagger § and Tak W. Mak*Dagger §

From the * Amgen Institute, Dagger  Ontario Cancer Institute, and § Departments of Medical Biophysics and Immunology, University of Toronto, Toronto, Ontario, Canada M5G 2C1

The interleukin-2 receptor beta  chain (IL-2Rbeta ) is expressed on a variety of hematopoietic cell types, including natural killer (NK) cells and nonconventional T lymphocyte subsets such as intestinal intraepithelial lymphocytes (IEL). However, the importance of IL-2Rbeta -mediated signaling in the growth and development of these cells has yet to be clearly established. We have investigated IEL and NK cells in mice deficient for IL-2Rbeta and describe here striking defects in the development of these cells. IL-2Rbeta -/- mice exhibited an abnormal IEL cell population, characterized by a dramatic reduction in T cell receptor alpha beta CD8alpha alpha and T cell receptor gamma delta lymphocytes. This selective decrease indicates that IEL can be classified into those whose development and/or differentiation is dependent on IL-2Rbeta function and those for which IL-2Rbeta -mediated signaling is not essential. NK cell development was also found to be disrupted in IL-2Rbeta -deficient mice, characterized by a reduction in NK1.1+CD3- cells in the peripheral circulation and an absence of NK cytotoxic activity in vitro. The dependence of NK cells and certain subclasses of IEL cells on IL-2Rbeta expression points to an essential role for signaling through this receptor, presumably by IL-2 and/or IL-15, in the development of lymphocyte subsets of extrathymic origin.


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