title: CD8 T cells activated in distinct lymphoid organs differentially express adhesion proteins and coexpress multiple chemokine receptors.
abstract: Previous work from this laboratory showed that generation of memory CD8 T cells by different immunization routes correlates with control of tumors growing in distinct sites. We hypothesized that effector CD8 T cell expression of adhesion proteins and chemokine receptors would be influenced by activation in different secondary lymphoid organs. In this report, CD8 T cells were activated by immunization with bone marrow-derived dendritic cells via i.p., i.v., or s.c. routes. Three distinct populations of activated CD8 T cells arise in mesenteric, axillary/brachial, and mediastinal lymph nodes and spleen based on differential expression of alpha4beta7 integrin, E-selectin ligand, and alpha4beta1 integrin, respectively. In contrast, three subsets of CD8 T cells defined by differential expression of P-selectin ligand and chemokine receptors were induced irrespective of activation site. The majority of activated CD8 T cells expressed CXCR3, with one subset additionally expressing P-selectin ligand, and another subset additionally expressing CCR3, CCR4, CCR5, CCR6, and CCR9. In the mesenteric lymph node, a fourth subset expressed CCR9 and CXCR3 in the absence of CCR5. Similar homing receptor profiles were induced in the same sites after localized vaccinia immunization. Homing receptor expression on CD8 T cells activated in vitro was distinct, revealing influences of both dendritic cells and the lymphoid microenvironment. Collectively, these results identify previously undescribed populations of activated CD8 T cells based on adhesion protein expression and coexpression of chemokine receptors that arise after activation in distinct secondary lymphoid organs.
authors.affiliation: Department of Microbiology, Carter Immunology Center, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.
authors.forename: Andrew R
authors.initials: AR
authors.lastname: Ferguson
authors.forename: Victor H
authors.initials: VH
authors.lastname: Engelhard
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000378:metabolism* / Q000473:pathology / Q000821:virology; D005786:Gene Expression Regulation / Q000276:immunology; D007249:Inflammation / Q000276:immunology / Q000378:metabolism / Q000821:virology; D018836:Inflammation Mediators / Q000378:metabolism / Q000502:physiology; D008198:Lymph Nodes / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000821:virology; D008213:Lymphocyte Activation / Q000235:genetics / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D019707:Receptors, Chemokine / Q000096:biosynthesis* / Q000235:genetics; D013154:Spleen / Q000276:immunology* / Q000378:metabolism / Q000473:pathology / Q000821:virology; D014616:Vaccinia virus / Q000276:immunology
chemical_list: D018836:Inflammation Mediators; D008562:Membrane Glycoproteins; C084882:P-selectin ligand protein; D019707:Receptors, Chemokine