| Autor: |
A M Dosne, L Chedid, F Dubor |
| Rok vydání: |
1987 |
| Předmět: |
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| Zdroj: |
XIth International Congress on Thrombosis and Haemostasis. |
| ISSN: |
2567-689X |
| DOI: |
10.1055/s-0038-1643191 |
| Popis: |
After treatment with PMA the human promyelocytic HL60 cells were induced to differentiate into a monocyte-macrophage population and to produce a high amount of plasminogen activator in the supernatant. This response was detected from 0,5 ng/ml of PMA and culminated at 5 ng. The plasminogen activator appeared of urokinase-type as showed by fibrinenzymographic analysis : the enzymatic profile of cell supernatant showed 2 lysis band (Mr 33.000 and 55.000) corresponding to those of urokinase of low and high mol. weight. Dexamethasone (100 pM) suppressed the production of this macrophage u-PA without evidence of plasminogen activator inhibitor (PAI) generation in the supernatant : free PAI was not detected in urokinase inhibition assays ; complexes of u-PA-PAI were not observed in fibrinoenzymographic studies. Supernatant of human endothelial cells added to HL60 cell supernatant neutralized the two molecular species of macrophage u-PA and gave rise to complexes (Mr 110.000 and 84.000) detected by fibrinoenzymography. These results suggested different possible levels for controlling u-PA of inflammatory macrophages including interaction with endothelial cells secretion since endothelial PAI is increased by some inflammatory monokine and also by dexamethasone, it appears that endothelium could have a regulatory role on inflammatory fibrinolysis. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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