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Abstract
Cultures of human endothelial cells (EC) incubated for periods up to 24 h with highly purified thrombin (2 NIH u/ml) contained considerably less cell-associated fibronectin fibrils than corresponding controls. The loss of fibronectin fibrils was evident after 4 h and was accompanied by a 2–3 fold increase in the concentration of fibronectin in the incubation medium. Hirudin inhibited the effects of thrombin. Thrombin also induced characteristic shape changes of EC. These shape changes were reversible within a 4–6 h period and could not be reinvoked by new additions of thrombin. Thus, structural refractoriness to thrombin coincided temporally with a period when EC-associated fibronectin fibrils were markedly reduced.
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