Abstract:
:The effects of human activated protein C (APC) and thrombin on plasminogen activator inhibitor (PAI-1) released from cultured human umbilical endothelial cells, grown in serum-free 35S-methionine containing medium, were studied in two ways: measurement of PAI-1 activity with an amidolytic assay, and immunoprecipitation of the medium with anti-PAI-1 IgG, anti-protein C IgG or anti-thrombin IgG followed by SDS-PAGE and autoradiography. Addition of APC or thrombin to the endothelial cell conditioned medium results in a time and concentration dependent loss of PAI-1 activity and in the degradation of PAI-1 from 46 kD into a 42 kD product. After incubation of the medium with APC in the presence of cells, an additional band of 95 kD was found, which could be immunoprecipitated with both anti-PAI-1 IgG and anti-protein C IgG, indicating the formation of an APC-PAI-1 complex before degradation occurs. No complex could be detected after incubation of the medium with thrombin in the presence of endothelial cells. Blocking the active sites of APC and thrombin prevented both the formation of APC-PAI-1 complexes and the inactivation and degradation of PAI-1. After removal of the active PAI-1 from the medium, no degradation of the inactive PAI-1 by APC or thrombin could be found. It is concluded that both APC and thrombin react with the active PAI-1, resulting in inactivation and degradation of PAI-1.
journal_name
Thromb Haemostjournal_title
Thrombosis and haemostasisauthors
de Fouw NJ,van Hinsbergh VW,de Jong YF,Haverkate F,Bertina RMsubject
Has Abstractpub_date
1987-04-07 00:00:00pages
176-82issue
2eissn
0340-6245issn
2567-689Xjournal_volume
57pub_type
杂志文章abstract::The efficacy and safety of dabigatran for treatment of venous thromboembolism (VTE) were demonstrated in two trials. It is unclear if the results pertain to patients with cancer and VTE. Data from two randomised trials comparing dabigatran and warfarin for acute VTE were pooled. Primary efficacy outcome was symptomati...
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
pub_type: 临床试验,杂志文章,随机对照试验
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journal_title:Thrombosis and haemostasis
pub_type: 临床试验,杂志文章,随机对照试验
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
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pub_type: 杂志文章,评审
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
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journal_title:Thrombosis and haemostasis
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