Disparate Localization of 55-kd and 75-kd Tumor Necrosis Factor Receptors in Human Endothelial Cells

Overview

Journal Am J Pathol

Publisher Elsevier

Specialty Pathology

Date 1995 Jan 1

PMID 7856733

Citations 36

Authors

J R Bradley

S Thiru

J S Pober

Affiliations

Soon will be listed here.

Abstract

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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