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

J Leukoc Biol. 2000 Jan;67(1):73-80. doi: 10.1002/jlb.67.1.73.


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.

Publication types

  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • Adult
  • Animals
  • CHO Cells
  • Cell Adhesion
  • Cricetinae
  • Humans
  • Membrane Glycoproteins / physiology*
  • Neutrophil Infiltration / physiology*
  • Neutrophils / cytology
  • Neutrophils / physiology*
  • P-Selectin / physiology*
  • Rabbits


  • Membrane Glycoproteins
  • P-Selectin
  • P-selectin ligand protein