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• W1971569771 abstract "Human cervical epithelial cells transfected and immortalized with human papillomavirus type 16 DNA (HCE16/3) can be, like many other epithelial cells, normally grown in medium supplemented with epidermal growth factor, cholera toxin, hydrocortisone, insulin, transferrin, thyroid hormone and serum. We found that hydrocortisone diminished tissue plasminogen activator (tPA) production to an undetectable level. The removal of hydrocortisone increased urokinase plasminogen activator (uPA) activity within 24-48 h and tPA activity within 48-72 h, and converted the cells to a more elongated and fibroblastic phenotype. Upregulation of uPA mRNA was seen as early as at 3 h and of tPA mRNA within 48-72 h. Higher molecular weight forms (97-110 kDa) of plasminogen activators were seen in zymograms, apparently complexed with PAI-1, starting at 6 h both in the presence and absence of hydrocortisone. Immunoprecipitation with a PAI-1 monoclonal antibody confirmed that both uPA and tPA were complexed. We also studied normal diploid human bronchial epithelial cells (NHBE) and NHBE cells transformed with an adeno-12/SV40 hybrid virus (BEAS-2B). In both types of nonmalignant epithelial cells, the removal of hydrocortisone increased uPA activity. The omission of hydrocortisone increased tPA levels significantly in BEAS-2B cell cultures, and in NHBE cell cultures tPA became detectable at 72 h. No PA complexes were seen in these two cell types. We conclude that normal and immortalized nonmalignant epithelial cells produce tPA, but only if hydrocortisone is omitted in the growth medium." @default.
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• W1971569771 date "2001-01-13" @default.
• W1971569771 modified "2023-09-23" @default.
• W1971569771 title "Elimination of Hydrocortisone from the Medium Enables Tissue Plasminogen Activator Gene Expression by Normal and Immortalized Nonmalignant Human Epithelial Cells" @default.
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• W1971569771 doi "https://doi.org/10.1515/bc.2001.191" @default.
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