Secretion of plasminogen activator inhibitor by cultured human epidermal cells

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Abstract
A conditioned medium from cultured human epidermal cells was observed to inhibit the activity of exogenous urokinase. By reverse fibrin autography after SDS polyacrylamide gel electrophoresis, a plasminogen activator inhibitor was detected with a molecular weight of 46000. Using Mr‐ 33000 [125I]‐labelled urokinase we observed the formation of an enzyme‐ligand complex. The molecular weight of this complex was 79000. These results indicate that cultured human epidermal cells secrete a plasminogen activator inhibitor (urokinase inhibitor) with a molecular weight of 46000.