Abstract:
:The activation of factor XI by meizothrombin was investigated using recombinant meizothrombin (R155A meizothrombin) that is resistant to autocatalytic removal of fragment 1. Meizothrombin was capable of activating factor XI at an activation rate similar to that of thrombin. Dextran sulphate and heparin, known cofactors of thrombin-mediated factor XI activation, did not stimulate the activation of factor XI by meizothrombin. However, the activation of factor XI by meizothrombin was markedly enhanced by vesicles containing phosphatidylcholine (PC), phosphatidylserine (PS) and phosphatidylethanolamine (PE), whereas PC/PS or PC/PE vesicles only had a minor effect on the activation. Thrombin-mediated factor XI activation was not influenced by phospholipids. The effect of PC/PS/PE and PC/PS vesicles was studied in a factor XI dependent clot lysis assay. In this assay, factor XI inhibits clot lysis by a feedback loop in the intrinsic pathway via thrombin-mediated factor XI activation. Removal of endogenous phospholipids in plasma by centrifugation resulted in an increased clot lysis, which could be restored to the pre-centrifugation level by the addition of PC/PS/PE vesicles, but not by PC/PS vesicles. When clot lysis was initiated by factor IXa in the presence of a factor XIa blocking antibody, there was no difference in inhibitory effect of PC/PS/PE or PC/PS vesicles. These data suggested that the differences in clot lysis inhibition observed between PC/PS/PE and PC/PS vesicles were caused by factor XI activation by meizothrombin. Meizothrombin-mediated factor XI activation may therefore play an important role in the antifibrinolytic feedback loop in the intrinsic pathway.
journal_name
Thromb Haemostjournal_title
Thrombosis and haemostasisauthors
von dem Borne PA,Mosnier LO,Tans G,Meijers JC,Bouma BNsubject
Has Abstractpub_date
1997-08-01 00:00:00pages
834-9issue
2eissn
0340-6245issn
2567-689Xjournal_volume
78pub_type
杂志文章abstract::We studied human platelet aggregation and beta-TG/PF4 release induced by heparin and related GAGs in vitro both in normal PRP and in PRP after aspirin. In our experimental conditions, heparin and related GAGs always caused PF4 release in vitro from normal platelets, whether or not there was measurable platelet aggrega...
journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:1984-02-28 00:00:00
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journal_title:Thrombosis and haemostasis
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journal_title:Thrombosis and haemostasis
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doi:10.1160/TH03-10-0657
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:1997-12-01 00:00:00
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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,多中心研究
doi:
更新日期:2000-11-01 00:00:00
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:10.1160/TH15-05-0381
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:1976-04-30 00:00:00
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:1980-02-29 00:00:00
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pub_type: 杂志文章
doi:10.1160/TH14-12-1014
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journal_title:Thrombosis and haemostasis
pub_type: 指南,杂志文章
doi:
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:1985-06-24 00:00:00
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
更新日期:2002-09-01 00:00:00
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:10.1160/TH03-10-0618
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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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doi:
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章
doi:
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journal_title:Thrombosis and haemostasis
pub_type: 杂志文章,评审
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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
pub_type: 杂志文章
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