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• W1515959698 abstract "Abstract After incubation of confluent monolayer cultures of human HT-1080 fibrosarcoma cells with purified native human plasminogen in plasminogen-depleted serum-containing medium, bound plasmin activity could be specifically eluted from the cells with tranexamic acid, an analogue of lysine. Dexamethasone reduced the amount of recoverable bound plasmin activity in a dose-dependent manner. Dexamethasone was also found to induce a time- and dose-dependent decrease in the ability of the cells to bind added plasmin. Untreated HT-1080 cells bound added plasmin with a high capacity (600,000 molecules bound per cell), and this decreased to an undetectable level after treatment with 100 nM dexamethasone. The kinetics of the loss of plasmin binding by the dexamethasone-treated sarcoma cells, a clear decrease after 4 h, correlated with those for the loss of cell-bound urokinase (u-PA) activity. Plasmin was not, however, bound to the active site of u-PA: an anti-catalytic monoclonal antibody to u-PA had no effect on plasmin binding. Other glucocorticoids, such as hydrocortisone and corticosterone, had a similar effect to dexamethasone on plasmin binding to HT-1080 cells. The effect of glucocorticoids on the plasmin receptor seemed to occur at least partly via a decrease in the affinity for plasmin, since the Kd for plasmin with untreated cells was 5.4 x 10(-9) M, and with cells treated with 5 nM dexamethasone, the Kd value for plasmin was 1.2 x 10(-7) M. These results show that glucocorticoids induce down-regulation of plasmin receptors on the surface of HT-1080 cells: a novel mechanism, in addition to the known effects of glucocorticoids on u-PA and PA inhibitors, by which human tumor cells may be disarmed of their pericellular proteolytic activity." @default.
• W1515959698 created "2016-06-24" @default.
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• W1515959698 date "1989-04-01" @default.
• W1515959698 modified "2023-09-30" @default.
• W1515959698 title "Down-regulation of Plasmin Receptors on Human Sarcoma Cells by Glucocorticoids" @default.
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• W1515959698 doi "https://doi.org/10.1016/s0021-9258(18)83594-3" @default.
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