title: Coordinated redistribution of leukocyte LFA-1 and endothelial cell ICAM-1 accompany neutrophil transmigration.
abstract: The leukocyte integrin lymphocyte function-associated antigen 1 (LFA-1) and its endothelial ligand intercellular adhesion molecule (ICAM)-1 play an important role in transmigration as demonstrated by in vivo and in vitro models of inflammation. Despite the prominent role, little is known concerning the distribution and dynamic behavior of these adhesion molecules during leukocyte transmigration. Therefore, we examined the spatial and temporal distribution of LFA-1 on neutrophils actively transmigrating tumor necrosis factor-alpha-activated human umbilical vein endothelial monolayers under shear flow. Upon neutrophil arrest, LFA-1 was evenly distributed. However, once neutrophils initiated transmigration, LFA-1 rapidly redistributed to form a ringlike cluster at the neutrophil-endothelial junctional interface through which transmigration occurred. As transmigration was completed, LFA-1 redistributed to the neutrophil uropod. Endothelial ICAM-1 and JAM-A both colocalized with the ringlike LFA-1 cluster. Further analysis of PMA-stimulated neutrophils, which increase mobility of LFA-1, showed a rapid redistribution of LFA-1 and ICAM-1, but not endothelial JAM-A. Thus, endothelial JAM-A does not appear to contribute to adhesion or transmigration in this system. This is the first demonstration that neutrophil LFA-1 rapidly redistributes to form a ringlike structure that coclusters with endothelial ICAM-1 as the neutrophil transmigrates.
authors.affiliation: Dept. of Pathology, Center for Excellence in Vascular Biology, Brigham and Women's Hospital and Harvard Medical School, 77 Louis Pasteur Ave., Boston, MA 02115, USA.
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Shaw
authors.forename: Shuo
authors.initials: S
authors.lastname: Ma
authors.forename: Michael B
authors.initials: MB
authors.lastname: Kim
authors.forename: Ravi M
authors.initials: RM
authors.lastname: Rao
authors.forename: Charles U
authors.initials: CU
authors.lastname: Hartman
authors.forename: Richard M
authors.initials: RM
authors.lastname: Froio
authors.forename: Lin
authors.initials: L
authors.lastname: Yang
authors.forename: Todd
authors.initials: T
authors.lastname: Jones
authors.forename: Yuan
authors.initials: Y
authors.lastname: Liu
authors.forename: Asma
authors.initials: A
authors.lastname: Nusrat
authors.forename: Charles A
authors.initials: CA
authors.lastname: Parkos
authors.forename: F William
authors.initials: FW
authors.lastname: Luscinskas
mesh_terms: D002273:Carcinogens / Q000494:pharmacology; D002448:Cell Adhesion / Q000187:drug effects / Q000502:physiology; D002465:Cell Movement / Q000187:drug effects / Q000502:physiology*; D002478:Cells, Cultured; D042783:Endothelial Cells / Q000502:physiology; D006801:Humans; D018799:Intercellular Adhesion Molecule-1 / Q000378:metabolism*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000378:metabolism*; D018375:Neutrophil Activation / Q000187:drug effects / Q000502:physiology; D009504:Neutrophils / Q000502:physiology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology; D014471:Umbilical Veins / Q000166:cytology / Q000502:physiology
chemical_list: D002273:Carcinogens; D016169:Lymphocyte Function-Associated Antigen-1; D014409:Tumor Necrosis Factor-alpha; D018799:Intercellular Adhesion Molecule-1; D013755:Tetradecanoylphorbol Acetate