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*
Center for Immunology and Department of Laboratory Medicine and Pathology, University of Minnesota, Minneapolis, MN 55455;
Departments of Medicine and Pathology, University of Chicago, Chicago, IL 60637; and
Department of Medicine, University of Connecticut, Farmington, CT 06030
The transcription factor lung Krüppel-like factor (LKLF) is involved in naive T cell survival. Expression of LKLF is rapidly down-regulated upon T cell stimulation, raising the question of whether LKLF is reexpressed after activation, and what factors are required for such reexpression. Furthermore, the expression of LKLF in resting memory cells has not been determined. Here, we use the OT-I TCR transgenic mouse system to address these issues. LKLF was found to be reexpressed following culture of activated CD8 T cells in certain cytokines (IL-2, IL-7) but not others (IL-12) known to influence CTL development. Interestingly, induction of LKLF reexpression corresponded with long-term T cell survival and development of memory T cell phenotype. Furthermore, using OT-I cells stimulated in vivo, we demonstrated that Ag induced rapid LKLF down-regulation and that the factor is expressed by in vivo-derived memory T cells.
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