Distinct roles of ADP receptors in von Willebrand factor-mediated platelet signaling and activation under high flow.

Abstract:

:We have investigated the role of adenosine diphosphate (ADP) receptors in the adhesion, activation, and aggregation of platelets perfused over immobilized von Willebrand factor (VWF) under high shear stress. Blocking P2Y(1) prevented stable platelet adhesion and aggregation, indicative of a complete inhibition of alpha(IIb)beta(3) activation, and decreased the duration of transient arrests from 5.9 seconds +/- 2.8 seconds to 1.2 seconds +/- 0.8 seconds; in contrast, blocking P2Y(12) inhibited only the formation of larger aggregates. Moreover, blocking P2Y(1) decreased the proportion of platelets showing early intracytoplasmic Ca(++) elevations (alpha/beta peaks) from 20.6% +/- 1.6% to 14.6% +/- 1.5% (P < .01), and the corresponding peak ion concentration from 1543 nM +/- 312 nM to 1037 nM +/- 322 nM (P < .05); it also abolished the Ca(++) elevations seen in firmly attached platelets (gamma peaks). Blocking P2Y(12) had no effect on these parameters, and did not enhance the effect of inhibiting P2Y(1). Inhibition of phospholipase C had similar consequences as the blocking of P2Y(1), whereas inhibition of Src family kinases abolished both type alpha/beta and gamma Ca(++) oscillations, although the former effect required a higher inhibitor concentration. Our results demonstrate that, under elevated shear stress conditions, ADP signaling through P2Y(1) may contribute to the initial stages of platelet adhesion and activation mediated by immobilized VWF, and through P2Y(12) to sustained thrombus formation.

journal_name

Blood

journal_title

Blood

authors

Mazzucato M,Cozzi MR,Pradella P,Ruggeri ZM,De Marco L

doi

10.1182/blood-2004-03-1145

subject

Has Abstract

pub_date

2004-11-15 00:00:00

pages

3221-7

issue

10

eissn

0006-4971

issn

1528-0020

pii

2004-03-1145

journal_volume

104

pub_type

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