Abstract
An inducible carboxypeptidase activity in human plasma delays tissue-type plasminogen activator (TPA)-induced clot lysis in vitro. We investigated whether carboxypeptidase activity is induced in vivo during thrombosis and thrombolytic therapy in a canine model of myocardial infarction. By use of synthetic substrate assays, dog plasma was shown to contain an inducible carboxypeptidase activity that is efficiently inhibited by potato carboxypeptidase inhibitor. This inhibitor accelerates TPA-mediated clot lysis in vitro by an average of 27% (n = 5, P = .046). Analysis of the inducible carboxypeptidase activity in plasma samples of dogs with electrically induced thrombosis of the circumflex coronary artery treated with TPA revealed that (1) inducible carboxypeptidase activity is increased during thrombosis (8.7 +/- 2.0 U/L, P < .013) and thrombolytic therapy (9.9 +/- 1.8 U/L, P < .024) compared with baseline (3.2 +/- 2.0 U/L); (2) thrombosis is a prerequisite of carboxypeptidase induction during and after TPA infusion, since carboxypeptidase levels were lower in dogs without a coronary thrombus; and (3) a significant positive correlation (r = .6, P < .0069) of carboxypeptidase activity with time to restoration of blood flow was observed. These data indicate that carboxypeptidase activity is induced in vivo and may influence thrombolysis.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
