title: Selectin- and integrin-mediated T-lymphocyte rolling and arrest on TNF-alpha-activated endothelium: augmentation by erythrocytes.
abstract: The adhesive and hemodynamic forces that lead to lymphocyte rolling and arrest on activated endothelium and the biophysical role of various adhesion molecules and blood elements in this process are poorly understood. By quantifying their behaviour both in vivo and in vitro, we show here that erythrocytes facilitate selectin- and integrin-mediated rolling and binding of T-lymphocytes on tumor necrosis factor alpha-activated endothelium. The relative contribution of selectins and integrins to this process can be distinguished by using a simple mathematical expression of lymphocyte capture within the range of physiological shear stress. The need for selectin participation in lymphocyte capture increases with shear stress (> 1 dyn/cm2), and both beta 1 and beta 2 integrins act in synergy to produce adhesive drag on captured cells. These findings are potentially useful in developing strategies for intervening with T-cells in a variety of normal and pathological responses as well as for the delivery of genetically modified T-cells to their targets in vivo.
authors.affiliation: Steele Laboratory of Tumor Biology, Department of Radiation Oncology, Massachusetts General Hospital, Boston 02114, USA.
authors.forename: R J
authors.initials: RJ
authors.lastname: Melder
authors.forename: L L
authors.initials: LL
authors.lastname: Munn
authors.forename: S
authors.initials: S
authors.lastname: Yamada
authors.forename: C
authors.initials: C
authors.lastname: Ohkubo
authors.forename: R K
authors.initials: RK
authors.lastname: Jain
mesh_terms: D000818:Animals; D055592:Biophysical Phenomena; D001703:Biophysics; D002448:Cell Adhesion / Q000502:physiology*; D015815:Cell Adhesion Molecules / Q000502:physiology; D002465:Cell Movement / Q000502:physiology; D004730:Endothelium, Vascular / Q000166:cytology / Q000187:drug effects / Q000502:physiology*; D004912:Erythrocytes / Q000502:physiology*; D006439:Hemodynamics / Q000502:physiology; D006801:Humans; D066298:In Vitro Techniques; D016023:Integrins / Q000502:physiology; D051379:Mice; D016513:Mice, SCID; D019087:Selectins / Q000502:physiology; D013601:T-Lymphocytes / Q000166:cytology / Q000502:physiology*; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D015815:Cell Adhesion Molecules; D016023:Integrins; D019087:Selectins; D014409:Tumor Necrosis Factor-alpha