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Interleukin-8 Induces Neutrophil Transendothelial Migration

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Journal Immunology
Date 1991 Jan 1
PMID 1997402
Citations 71
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Abstract

Interleukin-8 (IL-8) is a potent neutrophil chemotactic stimulant. We have used chemically synthesized IL-8 to investigate its role in human neutrophil adhesion and transendothelial migration. IL-8 enhanced the adhesiveness of human neutrophils to plastic, and to both unstimulated and tumour necrosis factor (TNF)-stimulated endothelial monolayers in vitro. Using a two-compartment model separated by a confluent endothelial monolayer, we have shown that IL-8 chemotactic stimulation induced transmigration across the monolayer of up to 87.4 +/- 2.1% of added neutrophils (compared to random unstimulated transmigration of 2.2 +/- 0.7%), while chemokinetic stimulation led to transmigration of 21 +/- 3.8% of neutrophils. Preincubation of endothelium with TNF also induced transmigration in this model, and was additive when combined with an IL-8 chemotactic stimulus. Endothelial permeability was increased at maximal rates of chemotactic transmigration, which may correlate with increased permeability of vessels at inflammatory sites in vivo. The property of IL-8 to stimulate movement of neutrophils across endothelial monolayers in vitro supports the concept of a central role for this molecule in the accumulation of neutrophils at inflammatory lesions in vivo.

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