Physical and enzymatic perturbation of the architecture of the Tunica media destroys its inherent thromboresistance

Erzsebet Komorowicz, Robert D. McBane, David N. Fass

Research output: Contribution to journalArticle

4 Scopus citations

Abstract

The media layer of the arterial cryo-cross sections, is defective for vWf-dependent platelet adhesion. Exposure of the same layer by stripping off the most inner portions of the vessel wall results in a highly thrombogenic surface. Stripping or balloon dilation was applied to porcine arteries prior to functional assays. Cryosections of treated or untreated arteries were perfused with porcine blood at 3350 s-1 and platelet deposition was detected by indirect immunofluorescence. Following balloon dilation, vWf-dependent platelet deposition increased; covering 9.08 ± 1.36% of the total media surface area, this value for untreated vessels was 0.88 ± 0.14%. A 10-fold increase was also found in the binding of vWf-coated fluorescent beads to the media. In addition to mechanical procedures, treatment by serine-proteases like trypsin, chymotrypsin and proteinase 3, or by chondroitinase ABC, but not by heparitinase also resulted in a 7-10-fold increase in platelet coverage over the media. Collagen in the media may be complexed with another vessel wall component shielding the vWf-binding sites. Mechanical or biochemical processes unmask these sites, and increase the thrombogenicity of the vessel wall.

Original languageEnglish (US)
Pages (from-to)827-833
Number of pages7
JournalThrombosis and Haemostasis
Volume88
Issue number5
StatePublished - Nov 1 2002

Keywords

  • Collagen
  • Platelets
  • Proteoglycan
  • Vascular media
  • Von Willebrand factor

ASJC Scopus subject areas

  • Hematology

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