The Journal of Experimental Medicine
StemCell Technologies
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Published online 30 September 2002 doi:10.1084/jem.20020772
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© Rockefeller University Press, 0022-1007/2002/10/935/ $5.00
The Journal of Experimental Medicine, Volume 196, Number 7, October 7, 2002 935-946

Interleukin 15 Controls both Proliferation and Survival of a Subset of Memory-Phenotype CD8+ T Cells

Adam D. Judge, Xiaohong Zhang, Hideki Fujii, Charles D. Surh and Jonathan Sprent

Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037

Address correspondence to Jonathan Sprent, 10550 N. Torrey Pines Rd., La Jolla, CA 92037. Phone: 858-784-8619; Fax: 858-784-8839; E-mail: jsprent{at}scripps.edu

Previous work has shown that memory-phenotype CD44hi CD8+ cells are controlled by a cytokine, interleukin (IL)-15. However, the dependency of CD44hi CD8+ cells on IL-15 is partial rather than complete. Here, evidence is presented that CD44hi CD8+ cells comprise a mixed population of IL-15–dependent and IL-15–independent cells. The major subset of CD122hi CD44hi CD8+ cells is heavily dependent on IL-15 by three different parameters, namely (1) "bystander" proliferation induced via IFN-induced stimulation of the innate immune system, (2) normal "background" proliferation, and (3) T cell survival; IL-15 dependency is most extreme for the Ly49+ subset of CD122hi CD44hi CD8+ cells. In contrast to CD122hi cells, the CD122lo subset of CD44hi CD8+ cells is IL-15 independent; likewise, being CD122lo, CD44hi CD4+ cells are IL-15 independent. Thus, subsets of memory-phenotype T cells differ radically in their sensitivity to IL-15.

Key Words: IL-15 • T cell subsets • CD122 • CD44 • memory


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