Abstract
Leucocytes and vascular cells interact closely in inflammation and immunity and cytokines are important mediators of this interaction. The present study was designed to define the capacity of human endothelial cells (HEC) to produce a monocyte-derived neutrophil chemotactic factor (provisionally termed IL-8). IL-8 is a polypeptide chemotactic for neutrophils originally identified in the culture supernatant of lipopolysaccharide (LPS)-stimulated monocytes. IL-1 induced high levels of production of neutrophil chemotactic activity in culture supernatants of HEC. Optimal stimulation of activity was observed when HEC were cultured with 10-100 ng/ml IL-1 beta for 16 hr. Anti-IL-8 antibody blocked the chemotactic activity for neutrophils of IL-1-activated HEC supernatants. IL-1-treated HEC expressed high levels of IL-8 mRNA transcripts, as assessed by Northern blot analysis. Tumour necrosis factor (TNF) and LPS, unlike the inflammatory monokine IL-6, also induced IL-8 expression. Nuclear run-off experiments revealed that IL-1 activated transcription of the IL-8 gene. The production of IL-8 may represent a mechanism whereby endothelial cells, exposed to inflammatory signals, participate in the regulation of neutrophil extravasation.
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