title: Complex memory T-cell phenotypes revealed by coexpression of CD62L and CCR7.
abstract: Antigen-experienced T cells have been divided into CD62L+ CCR7+ central memory (TCM) and CD62L- CCR7- effector memory (TEM) cells. Here, we examined coexpression of CD62L and CCR7 in lymphocytic choriomeningitis virus-specific memory CD8 T cells from both lymphoid and nonlymphoid tissues. Three main points emerged: firstly, memory cells frequently expressed a mixed CD62L- CCR7+ phenotype that differed from the phenotypes of classical TEM and TCM cells; secondly, TCM cells were not restricted to lymphoid organs but were also present in significant numbers in nonlymphoid tissues; and thirdly, a major shift from a TCM to TEM phenotype was found in memory cells that had been stimulated repetitively with antigen.
authors.affiliation: Institute for Medical Microbiology and Hygiene, Department of Immunology, University of Freiburg, Freiburg, Germany.
authors.forename: Heike
authors.initials: H
authors.lastname: Unsoeld
authors.forename: Hanspeter
authors.initials: H
authors.lastname: Pircher
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D007156:Immunologic Memory; D019041:L-Selectin / Q000032:analysis*; D008217:Lymphocytic choriomeningitis virus / Q000276:immunology*; D008221:Lymphoid Tissue / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D010641:Phenotype; D054400:Receptors, CCR7; D019707:Receptors, Chemokine / Q000032:analysis*
chemical_list: C515371:Ccr7 protein, mouse; D054400:Receptors, CCR7; D019707:Receptors, Chemokine; D019041:L-Selectin