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Journal of Cell Science, Vol 102, Issue 4 821-832, Copyright © 1992 by Company of Biologists
JOURNAL ARTICLES |
NJ Klein, GI Shennan, RS Heyderman and M Levin
Department of Paediatrics, St Mary's Hospital Medical School, London, England.
There is increasing evidence that the glycosaminoglycan (GAG) component of the vascular endothelium is important in regulating vascular permeability, thromboresistance and cellular interactions. We have investigated the GAG metabolism of cultured human umbilical vein endothelial cells (HUVEC) in response to a range of inflammatory stimuli. Using both chemical measurement of cellular and supernatant GAGS and 35S labelling to identify newly synthesised GAGS, interleukin 1 (IL1), tumour necrosis factor (TNF) and interferon gamma (IFN gamma) were shown to influence sulphated GAG metabolism significantly. IL1 and TNF caused a marked increase in culture supernatant GAGS and a concomitant reduction in cell-associated GAGS. This was shown histochemically to be associated with a marked reduction and redistribution of endothelial surface anionic sites. The addition of neutrophils to HUVEC pretreated with Escherichia coli endotoxin, IL1 or TNF resulted in a further reduction in both cellular GAGS and surface anionic sites. These results suggest that changes in endothelial cell GAG metabolism during inflammation may contribute to the disturbance of vascular endothelial homeostasis associated with infectious and inflammatory states.
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