The Journal of Experimental Medicine
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Published 17 June 2002. doi:10.1084/jem.20020067
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© Rockefeller University Press, 0022-1007/2002/6/1533/ $5.00
The Journal of Experimental Medicine, Volume 195, Number 12, June 17, 2002 1533-1539

Overexpression of Interleukin (IL)-7 Leads to IL-15–independent Generation of Memory Phenotype CD8+ T Cells

William C. Kieper1, Joyce T. Tan1, Brea Bondi-Boyd1, Laurent Gapin2, Jonathan Sprent1, Rhodri Ceredig3 and Charles D. Surh1

1 Department of Immunology, The Scripps Research Institute, La Jolla, CA 92037
2 Division of Developmental Immunology, The La Jolla Institute for Allergy and Immunology, San Diego, CA 92121
3 U548 INSERM, CEA-Grenoble, F-38054 Grenoble, France

Address correspondence to Charles D. Surh, Dept. of Immunology, IMM-26, The Scripps Research Institute, 10550 North Torrey Pines Rd., La Jolla, CA 92037. Phone: 858-784-2006; Fax: 858-784-8227; E-mail: csurh{at}scripps.edu

Transgenic (TG) mice expressing a high copy number of interleukin (IL)-7 cDNA under the control of the major histocomaptability complex (MHC) class II promoter display a 10–20-fold increase in total T cell numbers. Here, we show that the increase in T cell numbers in IL-7 TG mice is most apparent at the level of memory phenotype CD44hi CD122hi CD8+ cells. Based on studies with T cell receptor (TCR) TG mice crossed to IL-7 TG mice, increased levels of IL-7 may provide costimulation for TCR recognition of self-MHC ligands and thus cause naive CD8+ cells to proliferate and differentiate into memory phenotype cells. In addition, a marked increase in CD44hi CD122hi CD8+ cells was found in IL-7 TG IL-15- mice. Since these cell are rare in normal IL-15- mice, the dependency of memory phenotype CD8+ cells on IL-15 can be overcome by overexpression of IL-7.

Key Words: T lymphocytes • homeostasis • cytokines • mice • transgenic


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