title: T cell interaction with ICAM-1-deficient endothelium in vitro: transendothelial migration of different T cell populations is mediated by endothelial ICAM-1 and ICAM-2.
abstract: The trafficking of T lymphocytes is carefully regulated by adhesive interactions with the vascular endothelium. Depending on their maturation and activation stage, T lymphocytes exhibit distinctive patterns of homing and recirculation, which is at least partly due to the selective expression of cell adhesion molecules (CAM) on the T cell surface. In order to define whether the differential usage of CAM during the steps of transendothelial migration is involved in organ-specific recirculation of different T cell subsets we compared the interaction of three different T cell populations with mouse endothelioma cell lines in vitro. Using a novel approach, where we directly compared T cell interaction with ICAM-1-deficient endothelium to wild-type endothelium, we recently demonstrated that endothelial ICAM-1 and ICAM-2 play a key role in mediating the transendothelial migration of CD4(+) memory T cells. Here we show that endothelial ICAM-1 and ICAM-2 are equally required for the transendothelial migration of other T cell populations such as thymocytes and T lymphoma cells, which differ from CD4(+) memory T cells in their maturation and activation stage, as well as in their surface expression of adhesion molecules. Our data therefore demonstrate that transendothelial migration of different T cell populations is mediated by the same endothelial CAM, i.e. ICAM-1 and ICAM-2, and thus subset-specific interaction of T cells with endothelial cells must be regulated prior to transendothelial migration.
authors.affiliation: W. G. Kerckhoff-Institut, Max-Planck-Institut für Physiologische und Klinische Forschung, Parkstrasse 1, 61231 Bad Nauheim, Germany.
authors.forename: Y
authors.initials: Y
authors.lastname: Reiss
authors.forename: B
authors.initials: B
authors.lastname: Engelhardt
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000502:physiology*; D002448:Cell Adhesion / Q000502:physiology*; D015815:Cell Adhesion Molecules / Q000502:physiology*; D002465:Cell Movement / Q000502:physiology*; D002478:Cells, Cultured; D004727:Endothelium / Q000473:pathology / Q000502:physiology*; D018799:Intercellular Adhesion Molecule-1 / Q000502:physiology*; D051379:Mice; D018345:Mice, Knockout; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000502:physiology*; D013950:Thymus Gland / Q000166:cytology; D019010:Vascular Cell Adhesion Molecule-1 / Q000502:physiology
chemical_list: D015703:Antigens, CD; D015815:Cell Adhesion Molecules; C065289:ICAM2 protein, human; D019010:Vascular Cell Adhesion Molecule-1; D018799:Intercellular Adhesion Molecule-1