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ReportsDendritic Cell-Induced Memory T Cell Activation in Nonlymphoid TissuesSecondary lymphoid organs are dominant sites of T cell activation, although many T cells are subsequently retained within peripheral tissues. Currently, these nonlymphoid compartments are viewed as sites only of effector T cell function, without the involvement of renewed induction of immunity via the interactions with professional antigen-presenting cells. We describe a method of reactivation of herpes simplex virus to examine the stimulation of tissue-resident T cells during secondary challenge. The results revealed that memory CD8+ T cell responses can be initiated within peripheral tissues through a tripartite interaction that includes CD4+ T cells and recruited dendritic cells. These findings lend evidence for the existence of a sophisticated T cell response mechanism in extra-lymphoid tissues that can act to control localized infection.
1 Department of Microbiology and Immunology, University of Melbourne, Melbourne, Victoria 3010, Australia. * To whom correspondence should be addressed. E-mail: fcarbone{at}unimelb.edu.au (F.R.C.); heath{at}wehi.edu.au (W.R.H.)
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Science. ISSN 0036-8075 (print), 1095-9203 (online)