Nov 1, 1989

Identification of and partial characterization of platelet vitronectin: evidence for complex formation with platelet-derived plasminogen activator inhibitor-1

Blood
Klaus T PreissnerG Müller-Berghaus

Abstract

Vitronectin (VN; = complement S-protein), a plasma glycoprotein that is also associated with extracellular sites, was identified in washed human platelets contaminated with less than 0.05% of plasma VN. A specific enzyme-linked immunosorbent assay (ELISA) for VN has been developed and was used to detect and to quantitate VN in detergent extracts of washed platelets with 8.1 +/- 4.6 micrograms/10(9) platelets (n = 10), representing about 0.8% of the plasma VN pool. Platelet and plasma VN were similar by immunochemical criteria using Western-blot analysis, although platelet VN was mainly found as partially proteolyzed polypeptide. Total release of platelet VN occurred at optimal doses of Ca-ionophore 23187 or thrombin, whereas no VN was released by platelet treatment with digitonin or Staphylococcus alpha-toxin. During stimulation of washed platelets with various concentrations of thrombin, the nearly concomitant release of VN and plasminogen activator inhibitor-1 (PAI-1) together with platelet factor 4 indicated the association of VN with inner-platelet storage granules. Furthermore, platelet VN and PAI-1 in Ca-ionophore releasates comigrated during ultracentrifugation in high mol wt fractions of sucrose density gradients, indic...Continue Reading

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Mentioned in this Paper

VTN
Extracellular
Platelet Factor 4
Bacterial Toxins
Unspecified Staphylococcus Infection in Conditions Classified Elsewhere and of Unspecified Site
F2 gene
Digitonin
Thrombin
Platelet Factor 4 Assay
SERPINE1 wt Allele

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