title: Sialoadhesin on macrophages: its identification as a lymphocyte adhesion molecule.
abstract: In this study we present evidence that the mouse and rat sialoadhesin (originally named sheep erythrocyte receptor) on macrophages can function as a lymphocyte adhesion molecule. Lymphocytes were shown to bind to the splenic marginal zone, and lymph node subcapsular sinus and medulla in a frozen section assay. Selective depletion experiments showed that binding was mediated by macrophages. Adhesion was blocked by preincubation of the sections with monoclonal antibodies against mouse or rat sialoadhesin. Binding was temperature dependent, divalent cation independent, and involved sialic acid residues on the lymphocyte, as it could be inhibited by prior neuraminidase treatment or addition of the ganglioside GD1a. Binding to sialoadhesin was confirmed using the purified receptor and was observed among T cells, T blasts, B cells, and B blasts. Isolated macrophages or dendritic cells showed little binding. Sialoadhesin provides the first example of a macrophage-restricted lymphocyte adhesion molecule.
authors.affiliation: Department of Cell Biology, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands.
authors.forename: T K
authors.initials: TK
authors.lastname: van den Berg
authors.forename: J J
authors.initials: JJ
authors.lastname: Brevé
authors.forename: J G
authors.initials: JG
authors.lastname: Damoiseaux
authors.forename: E A
authors.initials: EA
authors.lastname: Döpp
authors.forename: S
authors.initials: S
authors.lastname: Kelm
authors.forename: P R
authors.initials: PR
authors.lastname: Crocker
authors.forename: C D
authors.initials: CD
authors.lastname: Dijkstra
authors.forename: G
authors.initials: G
authors.lastname: Kraal
mesh_terms: D000818:Animals; D015153:Blotting, Western; D015815:Cell Adhesion Molecules / Q000032:analysis* / Q000378:metabolism; D002478:Cells, Cultured; D007124:Immunoenzyme Techniques; D008214:Lymphocytes / Q000166:cytology; D008264:Macrophages / Q000737:chemistry* / Q000378:metabolism; D008297:Male; D008562:Membrane Glycoproteins; D051379:Mice; D008807:Mice, Inbred BALB C; D009928:Organ Specificity; D051381:Rats; D011919:Rats, Inbred Strains; D011971:Receptors, Immunologic / Q000032:analysis* / Q000378:metabolism; D063267:Sialic Acid Binding Ig-like Lectin 1
chemical_list: D015815:Cell Adhesion Molecules; D008562:Membrane Glycoproteins; D011971:Receptors, Immunologic; D063267:Sialic Acid Binding Ig-like Lectin 1; C571167:Siglec1 protein, mouse