Abstract:
:The normal balance between coagulation and fibrinolysis in the pleural cavity is poorly understood despite the critical role of the pleura in the movement of the lungs. To determine the fibrinolytic activity and the interaction between plasminogen activators and their inhibitors in the normal pleural space, we tested normal rat pleural leukocytes, principally macrophages and mast cells, and their supernatants, for activity in an [125I]fibrin degradation assay. It was found that pleural leukocytes did not release plasminogen activator, but the leukocytes and their supernatants inhibited the plasminogen-dependent fibrinolysis caused by both alveolar leukocytes and mesothelial cells. Further experiments demonstrated that pleural leukocytes produce a protein inhibitor primarily against urokinase-induced fibrinolysis in culture and that macrophages are the main source of the inhibitor. The lysate of mast cell-enriched population exhibited high plasminogen activator activity while no such activity could be determined in macrophage-enriched lysate. These data show that normal rat pleural leukocytes contain plasminogen activator inside the cells and synthesize a urokinase-type plasminogen activator inhibitor in culture that may be important in the fibrinolysis/coagulation balance in the pleural space.
journal_name
Lungjournal_title
Lungauthors
Li XY,Brown GM,Lamb D,Donaldson Kdoi
10.1007/BF02719708subject
Has Abstractpub_date
1990-01-01 00:00:00pages
309-22issue
6eissn
0341-2040issn
1432-1750journal_volume
168pub_type
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