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Binding of type 1 plasminogen activator inhibitor to the extracellular matrix of cultured bovine endothelial cells

Academic Article
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Overview

authors

  • Mimuro, J.
  • Loskutoff, David J.

publication date

  • March 1989

journal

  • Journal of Biological Chemistry  Journal

abstract

  • The binding of type 1 plasminogen activator inhibitor (PAI-1) to the extracellular matrix (ECM) of cultured bovine aortic endothelial cells was investigated using purified 125I-labeled or L-[35S]methionine-labeled PAI-1 as probes. Little specific binding of latent PAI-1 to ECM previously depleted of endogenous PAI-1 could be demonstrated. In contrast, the guanidine-activated form of PAI-1 bound to ECM in a dose- and time-dependent manner, and binding was saturable. The dissociation constant (Kd) for this interaction was estimated to be 60 nM by Scatchard analysis, and approximately 6 pmol of activated PAI-1 was bound per cm2 of ECM. Binding was relatively specific since unlabeled, activated PAI-1 competed with 35S-labeled PAI-1 for binding to ECM, but latent PAI-1 did not. Moreover, PAI-2, protein C inhibitor (i.e. PAI-3), protease nexin-1, and alpha 2-antiplasmin were not able to compete. Tissue-type plasminogen activator (tPA) also inhibited binding, but diisopropyl fluorophosphate-inactivated tPA did not. Pretreatment of ECM with tPA, urokinase-type PA, or thrombin had no effect on its ability to subsequently bind PAI-1, whereas trypsin, plasmin, and elastase pretreatment greatly reduced its ability to bind PAI-1. Guanidine-activated, radiolabeled PAI-1 resembled active endogenous PAI-1 since it was unstable in solution but stable when bound to ECM. In addition, it formed complexes with tPA that had a relatively low affinity for ECM. These data suggest that ECM of bovine aortic endothelial cells contains a protease-sensitive structure that binds active PAI-1 tightly and relatively selectively and that this association stabilizes PAI-1 against the spontaneous loss of activity that occurs in solution.

subject areas

  • Animals
  • Binding Sites
  • Cattle
  • Cells, Cultured
  • Endothelium, Vascular
  • Extracellular Matrix
  • Glycoproteins
  • Humans
  • Hydrolysis
  • Kinetics
  • Peptide Hydrolases
  • Plasminogen Activators
  • Plasminogen Inactivators
  • Tissue Plasminogen Activator
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Identity

International Standard Serial Number (ISSN)

  • 0021-9258

PubMed ID

  • 2494180
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Additional Document Info

start page

  • 5058

end page

  • 5063

volume

  • 264

issue

  • 9

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