title: Rapid acquisition of tissue-specific homing phenotypes by CD4(+) T cells activated in cutaneous or mucosal lymphoid tissues.
abstract: Effector and memory T cells can be subdivided based on their ability to traffic through peripheral tissues such as inflamed skin and intestinal lamina propria, a property controlled by expression of 'tissue-specific' adhesion and chemoattractant receptors. However, little is known about the development of these selectively homing T cell subsets, and it is unclear whether activation in cutaneous versus intestinal lymphoid organs directly results in effector/memory T cells that differentially express adhesion and chemoattractant receptors targeting them to the corresponding nonlymphoid site. We define two murine CD4(+) effector/memory T cell subsets that preferentially localize in cutaneous or intestinal lymphoid organs by their reciprocal expression of the adhesion molecules P-selectin ligand (P-lig) and alpha 4 beta 7, respectively. We show that within 2 d of systemic immunization CD4(+) T cells activated in cutaneous lymph nodes upregulate P-lig, and downregulate alpha 4 beta 7, while those responding to antigen in intestinal lymph nodes selectively express high levels of alpha 4 beta 7 and acquire responsiveness to the intestinal chemokine thymus-expressed chemokine (TECK). Thus, during an immune response, local microenvironments within cutaneous and intestinal secondary lymphoid organs differentially direct T cell expression of these adhesion and chemoattractant receptors, targeting the resulting effector T cells to the inflamed skin or intestinal lamina propria.
authors.affiliation: Laboratory of Immunology and Vascular Biology, Department of Pathology, Stanford University School of Medicine, Stanford, CA 94305, USA. daniel@macampbell.com
authors.forename: Daniel J
authors.initials: DJ
authors.lastname: Campbell
authors.forename: Eugene C
authors.initials: EC
authors.lastname: Butcher
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology*; D002448:Cell Adhesion; D002634:Chemotaxis, Leukocyte / Q000276:immunology*; D007156:Immunologic Memory; D016023:Integrins / Q000096:biosynthesis; D007413:Intestinal Mucosa / Q000276:immunology*; D008213:Lymphocyte Activation; D008221:Lymphoid Tissue / Q000276:immunology*; D008562:Membrane Glycoproteins / Q000096:biosynthesis; D051379:Mice; D008807:Mice, Inbred BALB C; D012867:Skin / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology
chemical_list: D016023:Integrins; D008562:Membrane Glycoproteins; C084882:P-selectin ligand protein; C071777:integrin alpha4beta7