title: Reciprocal and dynamic control of CD8 T cell homing by dendritic cells from skin- and gut-associated lymphoid tissues.
abstract: T cell activation by intestinal dendritic cells (DC) induces gut-tropism. We show that, reciprocally, DC from peripheral lymph nodes (PLN-DC) induce homing receptors promoting CD8 T cell accumulation in inflamed skin, particularly ligands for P- and E-selectin. Differential imprinting of tissue-tropism was independent of Th1/Th2 cytokines and not restricted to particular DC subsets. Fixed PLN-DC retained the capacity to induce selectin ligands on T cells, which was suppressed by addition of live intestinal DC. By contrast, fixed intestinal DC failed to promote gut-tropism and instead induced skin-homing receptors. Moreover, the induction of selectin ligands driven by antigen-pulsed PLN-DC could be suppressed "in trans" by adding live intestinal DC, but PLN-DC did not suppress gut-homing receptors induced by intestinal DC. Reactivation of tissue-committed memory cells modified their tissue-tropism according to the last activating DC's origin. Thus, CD8 T cells activated by DC acquire selectin ligands by default unless they encounter fixation-sensitive signal(s) for gut-tropism from intestinal DC. Memory T cells remain responsive to these signals, allowing for dynamic migratory reprogramming by skin- and gut-associated DC.
authors.affiliation: The CBR Institute for Biomedical Research, Harvard Medical School, Boston, MA 02115, USA.
authors.forename: J Rodrigo
authors.initials: JR
authors.lastname: Mora
authors.forename: Guiying
authors.initials: G
authors.lastname: Cheng
authors.forename: Dominic
authors.initials: D
authors.lastname: Picarella
authors.forename: Michael
authors.initials: M
authors.lastname: Briskin
authors.forename: Natasha
authors.initials: N
authors.lastname: Buchanan
authors.forename: Ulrich H
authors.initials: UH
authors.lastname: von Andrian
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000378:metabolism*; D002465:Cell Movement / Q000502:physiology*; D016207:Cytokines / Q000378:metabolism; D003713:Dendritic Cells / Q000378:metabolism*; D041981:Gastrointestinal Tract / Q000378:metabolism; D007249:Inflammation / Q000378:metabolism; D008221:Lymphoid Tissue / Q000378:metabolism*; D051379:Mice; D008810:Mice, Inbred C57BL; D012333:RNA, Messenger / Q000378:metabolism; D012867:Skin / Q000378:metabolism; D018417:Th1 Cells / Q000378:metabolism; D018418:Th2 Cells / Q000378:metabolism; D014699:Venules / Q000378:metabolism
chemical_list: D016207:Cytokines; D012333:RNA, Messenger