Nicotine alters fibronectin and factor VIII/vWF in human vascular endothelial cells

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Abstract
Summary. Primary cultured human endothelial cells derived from umbilical cord vein were exposed during the growth of the culture to medium containing nicotine at various concentrations (0.5‐200 μg/ml). Patterns of cellular fibronectin and factor VIII/vWF were compared to control by immunofluores‐cence technique. The levels of glycoproteins released in the culture medium were quantified by ELISA method. Treated cells showed an important decrease in fibronectin content with fragmentation of the fribronectin pericellular filaments, whereas the levels of secreted fibronectin were reduced in a dose‐dependent manner. This reduction of fibronectin availability was correlated with an elongation of cell shape as revealed with phase contrast microscopy. By immunofluorescence, factor VIII/vWF cytoplasmic granules appeared drastically reduced whereas the secretion of the protein was significantly increased. As shown by electron microscopy, there was a concomitant reduction in the number and size of Weibel‐Palade bodies. These studies indicate that nicotine modifies fibronectin and factor VIII/vWF distributions but in different ways.