Inflammatory potential of neutrophils detected in sickle cell disease

Aaron F H Lum, Ted Wun, Donald Staunton, Scott I. Simon

Research output: Contribution to journalArticle

37 Scopus citations

Abstract

An early event in the inflammatory response is neutrophil recruitment to endothelium in response to chemotactic stimulation, which in turn activates CD18-integrin, which anchors neutrophils to the vessel wall under the shear force of blood flow. Activated neutrophils circulating in sickle cell disease (SCD) patients may significantly contribute to vascular occlusions (VOC) as neutrophils adherent to inflamed endothelium recruit sickle red blood cells inducing VOC. To elucidate the mechanisms by which neutrophils may participate in VOC in SCD, CD18-integrin expression and function in fresh blood samples of non-crisis patients were measured by flow cytometry. CD11b/CD18 membrane expression was ∼70% higher on unstimulated SCD neutrophils than controls, which correlated with a 1-fold higher rate of adhesion to ligand. Unstimulated SCD neutrophils expressed ∼30,000 active CD18 per cell, while controls expressed ∼6,000. Stimulation with a low concentration of IL-8 (0.1 nM) upregulated 100% more active CD18 and induced 60% more adhesion of SCD than control neutrophils. These data demonstrate that neutrophils from SCD patients constitutively express active CD18 in blood and respond with enhanced sensitivity to chemokine activation of adhesion, thus increasing their propensity for exuberant adhesion.

Original languageEnglish (US)
Pages (from-to)126-133
Number of pages8
JournalAmerican Journal of Hematology
Volume76
Issue number2
DOIs
StatePublished - Jun 2004

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Keywords

  • Activation
  • Inflammation
  • Integrin
  • Neutrophil
  • Sickle cell

ASJC Scopus subject areas

  • Hematology

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