The Journal of Experimental Medicine
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Published 21 April 2003. doi:10.1084/jem.20021812
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© Rockefeller University Press, 0022-1007/2003/4/1007 $5.00
The Journal of Experimental Medicine, Volume 197, Number 8, 1007-1016

Involvement of Avidity for Major Histocompatibility Complex in Homeostasis of Naive and Memory T Cells

George Kassiotis, Rose Zamoyska and Brigitta Stockinger

Division of Molecular Immunology, The National Institute for Medical Research, Mill Hill, London NW7 1AA, United Kingdom

Address correspondence to Dr. Brigitta Stockinger, Division of Molecular Immunology, The National Institute for Medical Research, Mill Hill, London NW7 1AA, UK. Phone: 44(0)2088162190; Fax: 44(0)2088162248; E-mail: bstocki{at}nimr.mrc.ac.uk

The requirements for survival and self-renewal of peripheral T cells and the nature of mechanisms controlling the size of the naive and memory pool are not completely understood. Here, we examine the involvement of the major histocompatibility complex (MHC) in survival and homeostatic expansion of naive and memory T cells. We show that the homeostatic behavior of naive T cell receptor (TCR)-transgenic T cells can be deduced by the expression levels of TCR and CD5, a negative regulator of TCR signaling. Both these factors determine the strength of TCR stimulation by MHC-derived signals. We further show that, similarly to naive T cells, MHC-derived signals influence the homeostatic expansion capacity of memory T cells under lymphopenic conditions. In contrast to naive T cells, however, memory T cells can reach a homeostatic equilibrium, in which survival/self-renewal of each clone is dissociated from their avidity for MHC-derived signals.

Key Words: major histocompatibility complex • CD4-positive T lymphocytes • immunological memory • T cell receptor


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