PMID: 8608343Dec 1, 1995Paper

tPA of human keratinocytes: contribution to cell surface-associated plasminogen activation and upregulation by retinoic acid

Experimental Dermatology
F BuesseckerM D Kramer

Abstract

We tested distinct variants of a human keratinocyte line (HaCaT) for the expression of tissue-type plasminogen activator (tPA)-specific mRNA, as well as cell surface-associated and secreted tPA. Cells of early passages (passage no. 22) only expressed urokinase plasminogen activator (uPA)- but not tPA-specific mRNA. Cells after prolonged culture (passage no. 44) expressed uPA- and tPA-specific mRNA, but did not release tPA in the extracellular space and did not display surface-associated tPA. HaCaT cells transformed with the c-Ha-ras oncogene (HaCaTras) showed both secreted and surface-associated tPA antigen. The secreted and the surface-associated plasminogen activator (PA)-activity of HaCaTras cells were in part inhibitable by anticatalytic anti-tPA antibodies, thus indicating that tPA contributes to extracellular and surface-associated plasminogen activation. Finally, we demonstrate that tPA secretion of HaCaT 44 cells can be induced by retinoic acid, most likely via interaction of retinoic acid with nuclear-associated retinoic acid-receptor(s).

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Citations

Aug 1, 1996·Archives of Dermatological Research·J M RoxM D Kramer
May 25, 2021·Research and Practice in Thrombosis and Haemostasis·Dino MehicJohanna Gebhart

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