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Prepublished online as a Blood First Edition Paper on May 15, 2003; DOI 10.1182/blood-2003-02-0420. This Article Full Text Full Text (PDF) All Versions of this Article: 2003-02-0420v1 102/5/1779    most recent Alert me when this article is cited Alert me if a correction is posted Citation Map Services Email this article to a friend Similar articles in this journal Similar articles in PubMed Alert me to new issues of the journal Download to citation manager Rights and Permissions Citing Articles Citing Articles via HighWire Citing Articles via CrossRef Citing Articles via Google Scholar Google Scholar Articles by Rufer, N. Articles by Romero, P. Search for Related Content PubMed PubMed Citation Articles by Rufer, N. Articles by Romero, P. Related Collections Immunobiology Signal Transduction Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 September 2003, Vol. 102, No. 5, pp. 1779-1787 IMMUNOBIOLOGY Ex vivo characterization of human CD8+ T subsets with distinct replicative history and partial effector functions Nathalie Rufer, Alfred Zippelius, Pascal Batard, Mikaël J. Pittet, Isabel Kurth, Patricia Corthesy, Jean-Charles Cerottini, Serge Leyvraz, Eddy Roosnek, Markus Nabholz, and Pedro Romero From the Swiss Institute for Experimental Cancer Research, Epalinges, Switzerland; Division of Clinical Onco-Immunology, Ludwig Institute for Cancer Research, Lausanne Branch, University Hospital, Lausanne, Switzerland; Ludwig Institute for Cancer Research, Lausanne Branch, University of Lausanne, Epalinges, Switzerland; Multidisciplinary Oncology Center, University Hospital (CHUV), Lausanne, Switzerland; and Division of Immunology and Allergology, University Hospital of Geneva, Geneva, Switzerland. After antigenic challenge, naive T lymphocytes enter a program of proliferation and differentiation during the course of which they acquire effector functions and may ultimately become memory cells. In humans, the pathways of effector and memory T-cell differentiation remain poorly defined. Here we describe the properties of 2 CD8+ T-lymphocyte subsets, RA+CCR7–27+28+ and RA+CCR7–27+28–, in human peripheral blood. These cells display phenotypic and functional features that are intermediate between naive and effector T cells. Like naive T lymphocytes, both subsets show relatively long telomeres. However, unlike the naive population, these T cells exhibit reduced levels of T-cell receptor excision circles (TRECs), indicating they have undergone additional rounds of in vivo cell division. Furthermore, we show that they also share effector-type properties. At equivalent in vivo replicative history, the 2 subsets express high levels of Fas/CD95 and CD11a, as well as increasing levels of effector mediators such as granzyme B, perforin, interferon , and tumor necrosis factor . Both display partial ex vivo cytolytic activity and can be found among cytomegalovirus-specific cytolytic T cells. 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