title: Requirement for CD44 in activated T cell extravasation into an inflammatory site.
abstract: Leukocytes extravasate from the blood into inflammatory sites through complementary ligand interactions between leukocytes and endothelial cells. Activation of T cells increases their binding to hyaluronate (HA) and enables CD44-mediated primary adhesion (rolling). This rolling could be induced in vivo in murine Vbeta8(+) T cells in response to specific superantigen stimulation; it was initially found in lymph nodes, then in peripheral blood, and finally within the peritoneum, the original inflamed site. The migration of Vbeta8(+) cells into the peritoneal cavity was dependent on CD44 and HA, as shown by inhibition studies. Thus, CD44-HA interactions can target lymphocytes to specific extralymphoid effector sites.
authors.affiliation: Laboratory of Molecular Pathology, Department of Pathology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75235, USA.
authors.forename: H C
authors.initials: HC
authors.lastname: DeGrendele
authors.forename: P
authors.initials: P
authors.lastname: Estess
authors.forename: M H
authors.initials: MH
authors.lastname: Siegelman
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D002448:Cell Adhesion; D002465:Cell Movement; D004768:Enterotoxins / Q000276:immunology; D018960:Hyaluronan Receptors / Q000378:metabolism*; D006820:Hyaluronic Acid / Q000378:metabolism; D008024:Ligands; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D010529:Peritoneal Cavity / Q000166:cytology; D010538:Peritonitis / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000032:analysis*; D016693:Receptors, Antigen, T-Cell, alpha-beta; D018089:Superantigens / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000502:physiology*
chemical_list: D000911:Antibodies, Monoclonal; D004768:Enterotoxins; D018960:Hyaluronan Receptors; D008024:Ligands; D011948:Receptors, Antigen, T-Cell; D016693:Receptors, Antigen, T-Cell, alpha-beta; D018089:Superantigens; C075784:T cell receptor Vbeta8; C031818:enterotoxin B, staphylococcal; D006820:Hyaluronic Acid