Neonatal neutrophil interaction with P-selectin: Contribution of P- selectin glycoprotein ligand-1 and sialic acid

M. Hossein Tcharmtchi, C. Wayne Smith, M. Michele Mariscalco

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Previously we had determined that neonatal neutrophils had decreased interaction with monolayers expressing P-selectin compared to adult cells. In this study we examined the function of neonatal P-selectin glycoprotein ligand-1 (PSGL-1). A rabbit polyclonal antibody directed against the amino terminus of human PSGL-1 was produced and purified (3RB-PSGL-1). Neonatal neutrophils expressed the epitope recognized by 3RB-PSGL-1 and expression was decreased compared with adult neutrophils (20%, P < 0.05). In addition neonatal neutrophils had decreased interaction with Chinese hamster ovary (CHO)-P-selectin under both shear conditions and static adhesion (P < 0.05). Treatment of both neonatal and adult neutrophils with 3RB-PSGL-1 similarly inhibited the interaction with P-selectin monolayers under shear conditions, effects similar to treatment with O-sialoglycoprotein endopeptidase (OSGE). Neuraminidase treatment of neonatal and adult cells also markedly inhibited the interaction. In a detachment assay marked differences were noted between neonatal and adult cells treated with either 3RB-PSGL-1 or neuraminidase. Such treatments had little effect on adult neutrophils until shear stress exceeded 2.8 dynes/cm2. Treated neonatal neutrophils were exquisitely sensitive to shear stress with a marked decrease in interaction noted at a shear stress as low as 0.6 dynes/cm2. Thus the adhesive mechanisms that remain after treatment with neuraminidase or 3RB-PSGL-1 have a relatively low avidity and function less well in neonatal neutrophils compared to adult neutrophils. We speculate that this may account for the less efficient adhesion of neonatal neutrophils to P-selectin under conditions of flow.

    Original languageEnglish (US)
    Pages (from-to)73-80
    Number of pages8
    JournalJournal of Leukocyte Biology
    Volume67
    Issue number1
    DOIs
    StatePublished - 2000

    Keywords

    • Adhesion molecules
    • Cell trafficking
    • Human
    • Ontogeny

    ASJC Scopus subject areas

    • Immunology and Allergy
    • Immunology
    • Cell Biology

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