Abstract
Sialoadhesin is a macrophage-restricted, sialic acid-dependent receptor of 185 kD that binds to the oligosaccharide sequence NeuAc alpha 2,3Gal on cell surface glycoconjugates. Recent cDNA cloning has shown that sialoadhesin is a new member of the immunoglobulin superfamily with sequence similarity to CD22, a sialic acid-dependent receptor of B lymphocytes. Sialoadhesin has been implicated in cellular interactions of stromal macrophages with developing myeloid cells. In this study, direct evidence for this interaction was obtained in cell-cell binding assays using both native and recombinant forms of the protein. In all assays, sialoadhesin exhibited specific, differential binding to various murine cell populations of hemopoietic origin. In rank order, sialoadhesin bound neutrophils > bone marrow cells = blood leukocytes > lymphocytes > thymocytes. Single-cell analyses confirmed that sialoadhesin selectively bound myeloid cells in complex cell mixtures obtained from the bone marrow and blood. In comparison, a recombinant Fc-chimeric form of murine CD22 showed high binding to B and T lymphocytes, but very low binding to immature and mature myeloid cells. These results are consistent with the notion that sialoadhesin in involved in interactions with granulocytes at different stages of their life histories.
MeSH Terms
Animals
Carbohydrate Conformation
Carbohydrate Sequence
Cell Adhesion Molecules/immunology,metabolism
Cell Line
Chlorocebus aethiops
Cloning, Molecular
DNA, Complementary
Epitopes/analysis
Erythrocytes/immunology,metabolism
Female
Glycoconjugates/chemistry,immunology,metabolism
Granulocytes/immunology,metabolism
Immunoglobulin Fab Fragments/pharmacology
Immunoglobulin G/pharmacology
Kinetics
Male
Membrane Glycoproteins/immunology,isolation & purification,metabolism
Mice
Mice, Inbred C57BL
Molecular Sequence Data
Receptors, Immunologic/immunology,isolation & purification,metabolism
Recombinant Proteins/immunology,isolation & purification,metabolism
Sialic Acid Binding Ig-like Lectin 1
Transfection
Chemicals
Cell Adhesion Molecules
DNA, Complementary
Epitopes
Glycoconjugates
Immunoglobulin Fab Fragments
Immunoglobulin G
Membrane Glycoproteins
Receptors, Immunologic
Recombinant Proteins
Sialic Acid Binding Ig-like Lectin 1
Siglec1 protein, mouse
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
Crocker P R
Imperial Cancer Research Fund Laboratories, University of Oxford, John Radcliffe Hospital, United Kingdom.
Freeman S
Gordon S
Kelm S
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