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Scientific article
Open access
English

A comparative study of amyloid-beta (1-42) as a cofactor for plasminogen activation by vampire bat plasminogen activator and recombinant human tissue-type plasminogen activator

Published inThrombosis and haemostasis, vol. 92, no. 3, p. 559-567
Publication date2004
Abstract

The activity of both human tissue-type plasminogen activator (t-PA) and the PA from the saliva of the vampire bat, Desmodus rotundus, (DSPA) is critically dependent on the presence of a cofactor. The most efficient cofactor for both PAs is fibrin, but fibrinogen and amyloid beta peptides also have cofactor activities for human t-PA. Compared to t-PA, DSPA has a more stringent requirement for fibrin as a cofactor. The present study was undertaken to compare cofactor activities of amyloid beta 1-42 (Abeta1-42) for plasminogen activation by DSPA-alpha1 or by t-PA. The two PAs were incubated with different concentrations of glu-plasminogen, a chromogenic substrate for plasmin and 100 micro g mL (-1) of Abeta1-42, fibrinogen or fibrin as cofactor. Using the kinetic parameters directly determined from the chromogenic substrate conversion curves, we derived the relative efficacies of DSPA or t-PA in the presence of cofactor at the physiological plasminogen concentration of 2 micro M. In the presence of fibrin, the activity of DSPA was comparable to that of t-PA and 23,270-fold higher than its activity without cofactor, whereas fibrin induced only a 248-fold increase in t-PA activity. The activity of DSPA with Abeta1-42 or fibrinogen as cofactor was 485-fold lower than its activity in the presence of fibrin, while for t-PA this difference was only 26-fold. The much lower activity of DSPA as compared to t-PA with Abeta1-42 or fibrinogen might lead to fewer side effects when used for the thrombolytic therapy of stroke.

Keywords
  • Amyloid beta-Peptides/pharmacology
  • Animals
  • Chiroptera
  • Fibrin/pharmacology
  • Fibrinolysin/pharmacology
  • Fibrinolytic Agents/pharmacology
  • Humans
  • Kinetics
  • Peptide Fragments/pharmacology
  • Plasminogen/drug effects/metabolism
  • Plasminogen Activators/pharmacology
  • Recombinant Proteins/pharmacology
  • Tissue Plasminogen Activator/pharmacology
Citation (ISO format)
KRUITHOF, Egbert, SCHLEUNING, Wolf-Dieter. A comparative study of amyloid-beta (1-42) as a cofactor for plasminogen activation by vampire bat plasminogen activator and recombinant human tissue-type plasminogen activator. In: Thrombosis and haemostasis, 2004, vol. 92, n° 3, p. 559–567. doi: 10.1267/THRO04090000
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Article (Published version)
accessLevelPublic
Identifiers
ISSN of the journal0340-6245
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