title: RANTES stimulation of T lymphocyte adhesion and activation: role for LFA-1 and ICAM-3.
abstract: The chemokine RANTES is a potent chemoattractant and activator of T lymphocytes. Mechanisms underlying the RANTES-induced activation of T lymphocytes leading to adhesion and migration have not been fully analyzed. We investigate here the function of RANTES in the regulation of T cell adhesion, specifically the induction of homotypic aggregation. RANTES induced the expression of many important cell surface adhesion and activation receptors in a normal human T cell clone and peripheral blood T lymphocytes, including members of the beta 1 and beta 2 integrin family, CD44, CD50, and CD28. Up-regulation of these markers correlated with RANTES-stimulated homotypic adhesion of T cells. This homotypic aggregation event was RANTES dose-dependent, prolonged, and pertussis toxin-independent, but herbimycin A-sensitive, suggesting that it involves signaling through alternative (G alpha i protein-independent) pathways. Using specific monoclonal antibodies, the homotypic aggregation event was shown to be lymphocyte function-associated antigen-1 (LFA-1)-dependent, with no observable interaction through alpha 4 or beta 1 integrins. Intercellular adhesion molecule-3 (ICAM-3) and possibly ICAM-1 participate as LFA-1 ligands. Additionally, RANTES phosphorylated the beta chain of LFA-1 1-2 min following stimulation. These results imply a specific role for the chemokine RANTES in T cell activation and intercellular adhesion.
authors.affiliation: Department of Pathology, Digestive Disease Center, Stanford University School of Medicine CA, USA.
authors.forename: M C
authors.initials: MC
authors.lastname: Szabo
authors.forename: E C
authors.initials: EC
authors.lastname: Butcher
authors.forename: B W
authors.initials: BW
authors.lastname: McIntyre
authors.forename: T J
authors.initials: TJ
authors.lastname: Schall
authors.forename: K B
authors.initials: KB
authors.lastname: Bacon
mesh_terms: D000911:Antibodies, Monoclonal / Q000494:pharmacology; D015703:Antigens, CD; D000943:Antigens, Differentiation; D001667:Binding, Competitive / Q000276:immunology; D018821:CD18 Antigens / Q000187:drug effects / Q000378:metabolism; D002448:Cell Adhesion / Q000187:drug effects; D015815:Cell Adhesion Molecules / Q000096:biosynthesis / Q000502:physiology*; D002449:Cell Aggregation / Q000187:drug effects / Q000276:immunology; D002478:Cells, Cultured; D018946:Chemokine CCL5 / Q000378:metabolism / Q000494:pharmacology*; D002999:Clone Cells; D006801:Humans; D008213:Lymphocyte Activation / Q000187:drug effects*; D016169:Lymphocyte Function-Associated Antigen-1 / Q000096:biosynthesis / Q000502:physiology*; D010766:Phosphorylation / Q000187:drug effects; D011994:Recombinant Proteins / Q000494:pharmacology; D013601:T-Lymphocytes / Q000187:drug effects*
chemical_list: D000911:Antibodies, Monoclonal; D015703:Antigens, CD; D000943:Antigens, Differentiation; D018821:CD18 Antigens; D015815:Cell Adhesion Molecules; D018946:Chemokine CCL5; C483616:ICAM3 protein, human; D016169:Lymphocyte Function-Associated Antigen-1; D011994:Recombinant Proteins