title: The role of chemokines and extracellular matrix components in the migration of T lymphocytes into three-dimensional substrata.
abstract: The role of chemokines and their interactions with extracellular matrix components (ECM) or the capacity of T cells to migrate into and accumulate within three-dimensional (3D) collagen type 1 substrata was studied. We examined the influence of chemokines and fibronectin on the infiltration properties of non-infiltrative (do not migrate into 3D substrata) and spontaneously infiltrative (migrate into 3D substrata) T-cell lines. Infiltrative and non-infiltrative T-acute lymphocytic leukaemic cell lines exhibited no consistent differences with respect to the expression of various chemokine receptors or beta(1)-integrins. Chemokines presented inside the collagen increased the depth of migration of infiltrative T-cell lines, but did not render non-infiltrative T-cell lines infiltrative, although they augmented the attachment of non-infiltrative T-cell lines to the upper surface of the collagen. The presence of fibronectin inside the collagen did not render non-infiltrative T-cell lines infiltrative, but markedly augmented the migration of 'infiltrative' T-cell lines into collagen. Both infiltrative and non-infiltrative T-cell lines showed migratory responses to chemokines in Boyden assays (migration detected on 2D substrata). These results indicate that the process of T-cell infiltration/migration into 3D substrata depends on a tissue penetration mechanism distinguishable from migration on 2D substrata and that the basic capacity of T cells to infiltrate is independent of chemokines and ECM components applied as attractants.
authors.affiliation: Department of Clinical Immunology, University of Umeå, Umeå, Sweden.
authors.forename: Jyrki
authors.initials: J
authors.lastname: Ivanoff
authors.forename: Toomas
authors.initials: T
authors.lastname: Talme
authors.forename: Karl-Gösta
authors.initials: KG
authors.lastname: Sundqvist
mesh_terms: D002448:Cell Adhesion / Q000276:immunology; D002478:Cells, Cultured; D018925:Chemokines / Q000276:immunology*; D002634:Chemotaxis, Leukocyte / Q000276:immunology*; D003094:Collagen / Q000378:metabolism; D005109:Extracellular Matrix / Q000276:immunology*; D006801:Humans; D015458:Leukemia, T-Cell / Q000276:immunology; D019707:Receptors, Chemokine / Q000378:metabolism; D013601:T-Lymphocytes / Q000276:immunology*; D014407:Tumor Cells, Cultured
chemical_list: D018925:Chemokines; D019707:Receptors, Chemokine; D003094:Collagen