title: Yersinia invasin, a bacterial beta1-integrin ligand, is a potent inducer of lymphocyte motility and migration to collagen type IV and fibronectin.
abstract: The Yersinia pseudotuberculosis invasin protein was found to be a potent inducer of pseudopodia formation and chemotactic and haptotactic migration in human T lymphocytes. Checkerboard analysis confirmed that migration was directional. The Yersinia invasin triggered migration of otherwise poorly migratory normal T cells on fibronectin and in particular on collagen type IV, and augmented the migration of leukemic T cell lines on these components. Invasin-induced lymphocyte migration was inhibited by staurosporin that selectively prevented pseudopodia formation but, noteworthy, augmented adhesion. The motogenic and attractant properties of invasin (Inv) were mediated via beta1-integrins, as shown by lack of effect of Inv on the motility of a beta1-integrin-negative lymphoid cell line and inhibition of invasin-induced lymphocyte motility by anti-beta1 Abs. Inv was markedly more effective than the extracellular matrix components fibronectin, collagen type IV, and laminin, which also interact with lymphocyte beta1-integrins, with respect to induction of pseudopodia, chemotaxis, and haptotaxis. Thus, Yersinia invasin is a model ligand for induction of lymphocyte motility via beta1-integrins. The extraordinary capacity of Inv to trigger and guide T lymphocyte motility and potentiate lymphocyte migration to extracellular matrix components may be of pathogenetic significance for the movement of lymphocytes to extraintestinal sites secondary to Yersinia infection.
authors.affiliation: Department of Clinical Immunology, University of Umeå, Sweden.
authors.forename: I
authors.initials: I
authors.lastname: Arencibia
authors.forename: N C
authors.initials: NC
authors.lastname: Suárez
authors.forename: H
authors.initials: H
authors.lastname: Wolf-Watz
authors.forename: K G
authors.initials: KG
authors.lastname: Sundqvist
mesh_terms: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins / Q000494:pharmacology*; D002465:Cell Movement; D003094:Collagen / Q000502:physiology*; D005353:Fibronectins / Q000502:physiology*; D006801:Humans; D019012:Integrin beta1 / Q000502:physiology*; D013601:T-Lymphocytes / Q000187:drug effects* / Q000502:physiology; D015007:Yersinia / Q000472:pathogenicity*
chemical_list: D018829:Adhesins, Bacterial; D001426:Bacterial Proteins; D005353:Fibronectins; D019012:Integrin beta1; C053476:invasin, Yersinia; D003094:Collagen