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American Journal of Pathology, Vol 146, 27-32, Copyright © 1995 by American Society for Investigative Pathology
REGULAR ARTICLES |
JR Bradley, S Thiru and JS Pober
Department of Medicine, University of Cambridge School of Clinical Medicine, Addenbrooke's Hospital, United Kingdom.
We have used confocal immunofluorescence microscopy and immunogold electron microscopy to localize tumor necrosis factor (TNF) receptors in cultured human umbilical vein endothelial cells. The 75-kd receptor is largely expressed on the cell surface and undergoes endocytosis and transport to lycosomes through coated pits and coated vesicles. TNF may accelerate receptor clustering and internalization. The 55-kd receptor is expressed at much lower levels on the cell surface than the 75-kd receptor but is more abundant overall. It is predominantly localized to the Golgi apparatus and, to a lesser extent, cytoplasmic vacuoles. The cellular distribution of the 55-kd receptor is largely unaffected by TNF. These results have implications for TNF-mediated endothelial cell activation and for interactions between 75- and 55-kd TNF receptors.
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