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Vascular PG-M/versican variants promote platelet adhesion at low shear rates and cooperate with collagens to induce aggregation

In English

Författare

  • M Mazzucato
  • M R Cozzi
  • P Pradella
  • D Perissinotto
  • Anders Malmström
  • Matthias Mörgelin
  • P Spessotto
  • A Colombatti
  • L De Marco
  • R Perris

Summary, in English

We have identified a novel von Willebrand factor/fibrinogen/selectin-independent, platelet adhesion-promoting function of vascular PG-M/versicans that may be relevant in normal venous thrombosis and critical in atherosclerotic conditions. A purification scheme was devised to obtain vascular versicans, which by biochemical, immunochemical, and ultrastructural means were asserted to be 1) composed primarily of isoforms V1 and V2; 2) free of contaminants; 3) prevalently substituted with chondroitin-4-sulfate and dermatan sulfate (DS) chains; and 4) capable of binding hyaluronan to form link protein-stabilized ternary complexes. Real-time analysis of human platelet perfused under diverse shear forces showed that they largely failed to bind to several vascular and nonvascular proteoglycans (PGs). In contrast, they bound in a dose- and shear rate-dependent manner to vascular versicans, exhibiting a unique attachment-detachment kinetics and establishing a firm substrate tethering characterized with no significant aggregation. Digestion of these PGs with lyases and competition experiments with purified glycosaminoglycans revealed that platelet adhesion to vascular versicans was primarily mediated by their DS chains. Incorporation of the versicans into fibrillar collagen substrates augmented their adhesive activity and strongly promoted platelet aggregation at low and high shear rates. Affinity chromatography of platelet surfaces on DS columns identified a 120-140 kDa polypeptide complex that behaved as a specific vascular versican binding membrane ligand in solid-phase binding assays. These findings indicate that selective versican variants of the subendothelium may serve as ancillary GPIbalpha/integrin/selectin-independent platelet ligands in healthy and diseased vascular beds and may be directly responsible for the platelet accruing after rupture of atherosclerotic plaques., versican variants promote platelet adhesion at low shear rates and cooperate with collagens to induce aggregation.

Avdelning/ar

Publiceringsår

2002

Språk

Engelska

Sidor

1903-1916

Publikation/Tidskrift/Serie

FASEB Journal

Volym

16

Issue

14

Dokumenttyp

Artikel i tidskrift

Förlag

The Federation of American Societies for Experimental Biology

Ämne

  • Cell and Molecular Biology

Nyckelord

  • hemostasis
  • shear stress
  • proteoglycan

Status

Published

Forskningsgrupp

  • Matrix Biology

ISBN/ISSN/Övrigt

  • ISSN: 1530-6860