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Matches in SemOpenAlex for { <https://semopenalex.org/work/W1969076670> ?p ?o ?g. }

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• W1969076670 abstract "Although platelets contain approximately 90% of the total amount of plasminogen activator inhibitor type-1 (PAI-1) present in blood, the functional significance of PAI-1 in platelets has been controversial. Most assessments of platelet PAI-I have been performed with platelet lysates in which the PAI-I derived from platelets may have been inactivated during the course of lysis. This study was performed to determine whether elaboration of PAI-1 from platelets activated physiologically by thrombolysis of pre-formed clots inhibits activation of plasminogen by tissue-type plasminogen activator (t-PA). Human whole blood clots were formed in Chandler tubes, and release of PAI-1 from platelets was quantified during and after clot formation. Subsequently, clots were placed in different Chandler tubes, and the effects of platelet PAI-1 on lysis induced by t-PA were characterized. Both the activity and concentrations of PAI-1 elaborated from platelets peaked approximately 15 min after induction of clotting. Induction of clot lysis with t-PA, 1,000 to 5,000 ng/ml, was inhibited by platelet-rich compared with platelet-poor plasma. Platelets inhibited lysis of preformed clots by t-PA and plasminogen in buffer solutions as well. Both the inhibition of clot lysis and accumulation of PAI-1 released from platelets were prevented by attenuation of thrombin-mediated activation of platelets with hirudin. Furthermore, the PAI-I mediated inhibition was obviated by blockade of PAI-1 activity with a neutralizing monoclonal antibody to PAI-1. These results indicate that platelets inhibit clot lysis induced by t-PA by releasing functionally active PAI-1." @default.
• W1969076670 created "2016-06-24" @default.
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• W1969076670 creator A5035615314 @default.
• W1969076670 date "1993-12-01" @default.
• W1969076670 modified "2023-09-26" @default.
• W1969076670 title "Attenuation of thrombolysis by release of plasminogen activator inhibitor type-1 from platelets" @default.
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• W1969076670 doi "https://doi.org/10.1016/0049-3848(93)90241-f" @default.
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