title: The relation between T-cell expression of LFA-1 and immunological memory.
abstract: Antibodies against isotypes of the leucocyte common antigen (LCA, CD45) can be used to identify largely reciprocal subsets of human peripheral T cells, characterized by differential ability to respond to recall antigen in vitro. The transition from naive, unprimed T cells to memory cells capable of responding to recall stimulating has been associated with a switch in surface expression of CD45 from the CD45RA isotype to CD45RO. It has been proposed that this transition is accompanied by the coordinated up-regulation of a number of cell-surface molecules involved in cellular adhesion and/or activation, including the leucocyte function-associated antigens (LFA). In the present study we have examined the expression of LFA-1 on subsets of human peripheral T cells, and related it to the expression of markers of cellular activation and CD45 isotypes, and thus to immunological memory. Our results suggest that the intensity of LFA-1 expression on the surface membrane of human peripheral T cells is not tightly associated with maturation status as judged by LCA isotype expression, but rather reflects the degree of cellular activation. This conclusion is supported by data of T-cell function in vitro, showing similar antigen- and mitogen-induced proliferative responses in T-cell subsets characterized by low as well as high surface expression of LFA-1.
authors.affiliation: Centre for Medical Parasitology at Institute for Medical Microbiology, University of Copenhagen, Denmark.
authors.forename: L
authors.initials: L
authors.lastname: Hviid
authors.forename: N
authors.initials: N
authors.lastname: Odum
authors.forename: T G
authors.initials: TG
authors.lastname: Theander
mesh_terms: D000328:Adult; D015703:Antigens, CD / Q000032:analysis; D018845:CD11 Antigens; D015815:Cell Adhesion Molecules / Q000032:analysis; D002478:Cells, Cultured; D006801:Humans; D007156:Immunologic Memory / Q000276:immunology*; D018799:Intercellular Adhesion Molecule-1; D017493:Leukocyte Common Antigens / Q000032:analysis; D016169:Lymphocyte Function-Associated Antigen-1 / Q000032:analysis*; D015375:Receptors, Interleukin-2 / Q000032:analysis; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D015703:Antigens, CD; D018845:CD11 Antigens; D015815:Cell Adhesion Molecules; D016169:Lymphocyte Function-Associated Antigen-1; D015375:Receptors, Interleukin-2; D018799:Intercellular Adhesion Molecule-1; D017493:Leukocyte Common Antigens