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International Immunology, Vol. 11, No. 5, 699-706, May 1999
© 1999 Japanese Society for Immunology

Memory CD44int CD8 T cells show increased proliferative responses and IFN-{gamma} production following antigenic challenge in vitro

Maria Pihlgren, Christophe Arpin, Thierry Walzer, Martine Tomkowiak, Annie Thomas, Jacqueline Marvel and Patrice M. Dubois

Immunologie Cellulaire, Laboratoire de Biologie Moléculaire et Cellulaire, Ecole Normale Supérieure de Lyon, CNRS UMR 49, 46 allée d'Italie, 69364 Lyon Cedex 07, France

Correspondence to: J. Marvel

F5 TCR transgenic mice challenged in vivo with peptide generate long-lived primed CD8 T cells that hyper-proliferate in response to peptide in vitro. These primed CD8 T cells can be subdivided into three distinct populations on the basis of CD44 cell surface expression. In this report, we show that among primed CD8 T cells, those expressing intermediate levels of CD44 appear to be true memory T cells by the measurement of a variety of characteristics. Indeed, these cells hyper-proliferate in response to peptide re-stimulation in vitro, and produce IFN-{gamma} with faster kinetics and at higher levels than naive populations in vitro. We also show that CD8 T cells expressing high levels of CD44 express several activation markers and cycle in vivo in the absence of antigen. However, this population is unable to respond to peptide stimulation in vitro as measured by both proliferation and IFN-{gamma} secretion. The origin and specificity of these cells is unknown. These results provide evidence that memory CD8 T cells are functionally different from naive CD8 T cells both in terms of proliferation and cytokine secretion. They identify the CD8/CD44int T cells as the population responsible for hyper-reactivity in vitro.

Keywords: cell surface molecules, cytokines, memory, T lymphocytes

Transmitting editor: A. Cooke


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