title: Identification of sialoadhesin as a dominant lymph node counter-receptor for mouse macrophage galactose-type C-type lectin 1.
abstract: In the sensitization phase of contact hypersensitivity in mice, dermal macrophages (MOs) expressing MO galactose-type C-type lectin1 (MGL1) are known to migrate from the dermis to lymph nodes (LNs) where they accumulate in the subcapsular sinus, interfollicular regions, and areas surrounding high endothelial venules. We hypothesize that the interactions between MGL1 and its ligands determine the localizations of MGL1-positive cells within the LNs. In the present study, our major aim was to isolate MGL1 counter-receptor(s) from lysates of LNs using affinity chromatography with immobilized recombinant MGL1. Fractions bound and eluted with EDTA were analyzed by SDS-PAGE and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. One of the predominant components was sialoadhesin (Sn, Siglec-1). Sn from lysates of LNs was immobilized on microtiter plates precoated with anti-Sn monoclonal antibody, and binding of recombinant MGL1 and adhesion of cells expressing MGL1 were tested. The binding of recombinant MGL1 to Sn was shown to be dependent on Ca2+ and N-glycans on Sn. MGL1-transfected Chinese hamster ovary cells adhered to the Sn-coated plates, whereas mock transfectants did not. Immunohistochemical localization of anti-Sn monoclonal antibody in LN coincided with the subcapsular sinus area to which recombinant MGL1 was bound. Furthermore, the distribution of MGL1+ cells after sensitization with FITC was demonstrated to overlap with that of Sn within the subcapsular sinus of draining LNs. These results suggest that Sn acts as an endogenous counter-receptor for MGL1.
authors.affiliation: Graduate School of Pharmaceutical Sciences, The University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kumamoto
authors.forename: Nobuaki
authors.initials: N
authors.lastname: Higashi
authors.forename: Kaori
authors.initials: K
authors.lastname: Denda-Nagai
authors.forename: Makoto
authors.initials: M
authors.lastname: Tsuiji
authors.forename: Koji
authors.initials: K
authors.lastname: Sato
authors.forename: Paul R
authors.initials: PR
authors.lastname: Crocker
authors.forename: Tatsuro
authors.initials: T
authors.lastname: Irimura
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000737:chemistry; D001212:Asialoglycoproteins; D001665:Binding Sites; D015153:Blotting, Western; D016466:CHO Cells; D002118:Calcium / Q000737:chemistry; D002241:Carbohydrates / Q000737:chemistry; D002448:Cell Adhesion; D002465:Cell Movement; D002846:Chromatography, Affinity; D006224:Cricetinae; D018076:DNA, Complementary / Q000378:metabolism; D004492:Edetic Acid; D004591:Electrophoresis, Polyacrylamide Gel; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005434:Flow Cytometry; D007150:Immunohistochemistry; D037102:Lectins / Q000737:chemistry; D037181:Lectins, C-Type / Q000378:metabolism*; D008024:Ligands; D008198:Lymph Nodes / Q000378:metabolism*; D008264:Macrophages / Q000378:metabolism*; D008562:Membrane Glycoproteins / Q000737:chemistry / Q000502:physiology*; D008565:Membrane Proteins / Q000378:metabolism*; D051379:Mice; D011134:Polysaccharides / Q000737:chemistry; D011485:Protein Binding; D011971:Receptors, Immunologic / Q000737:chemistry / Q000502:physiology*; D011994:Recombinant Proteins / Q000737:chemistry; D063267:Sialic Acid Binding Ig-like Lectin 1; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013997:Time Factors; D014162:Transfection
chemical_list: D000911:Antibodies, Monoclonal; D001212:Asialoglycoproteins; D002241:Carbohydrates; C064720:Clec10a protein, mouse; D018076:DNA, Complementary; D037102:Lectins; D037181:Lectins, C-Type; D008024:Ligands; D008562:Membrane Glycoproteins; D008565:Membrane Proteins; D011134:Polysaccharides; D011971:Receptors, Immunologic; D011994:Recombinant Proteins; D063267:Sialic Acid Binding Ig-like Lectin 1; C571167:Siglec1 protein, mouse; D004492:Edetic Acid; D002118:Calcium