Cell surface lectins of human granulocytes: their expression is modulated by mononuclear cells and granulocyte/macrophage colony-stimulating factor.
This paper presents the characterization of a sugar-specific receptor on the surface of human circulating polymorphonuclear cells. With the help of fluorescent neoglycoproteins and flow cytometry, a receptor was identified as being specific for alpha-L-rhamnosyl residues. The number of receptors was 55,000/cell and their affinity reached 2 x 10(8) l mol-1. This number changed as a function of the biological state of the cells. Indeed, receptor expression was modulated by the presence of other cells. T cells and B cells increased the number of receptors on the granulocyte surface. Expression of the alpha-L-rhamnose-specific lectin was dependent on lymphocyte derived soluble factor(s), which induce(s) growth and differentiation of polymorphonuclear phagocytes. Granulocyte/macrophage colony-stimulating factor (GM-CSF) specifically produced a significant increase in the number of receptors for alpha-L-rhamnose (2-10-fold/cell). This modulation was independent of protein kinase C activators such as phorbol ester, which produced no effect on alpha-L-rhamnose receptor expression. These findings demonstrate that GM-CSF may stimulate post differentiation functions and properties of mature granulocytes.
Grillon
C
C
Département de Biochimie des glycoconjugés et lectines endogènes, CNRS, Orleans, France.
Monsigny
M
M
Kieda
C
C
D000911:Antibodies, Monoclonal; D001402:B-Lymphocytes / Q000276:immunology*; D002469:Cell Separation / Q000379:methods; D002478:Cells, Cultured; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000494:pharmacology*; D006098:Granulocytes / Q000187:drug effects / Q000276:immunology*; D006801:Humans; D007700:Kinetics; D007963:Leukocytes, Mononuclear / Q000502:physiology*; D011975:Receptors, Mitogen / Q000187:drug effects / Q000378:metabolism*; D012016:Reference Values; D013601:T-Lymphocytes / Q000276:immunology*; D013755:Tetradecanoylphorbol Acetate / Q000494:pharmacology
D000911:Antibodies, Monoclonal; D011975:Receptors, Mitogen; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D013755:Tetradecanoylphorbol Acetate