Platelets release active matrix metalloproteinase-2 in vivo in humans at a site of vascular injury: lack of inhibition by aspirin.

Abstract:

:When stimulated in vitro, human platelets release matrix metalloproteinase-2 (MMP-2) that, in turn, potentiates platelet activation. The present study investigated if MMP-2 is released from activated platelets in vivo in humans and whether aspirin inhibits this release. MMP-2 levels were measured by zymography, immunoblotting, flow-cytometry and an activity assay system, in plasma prepared from blood emerging from a skin wound inflicted for the measurement of the bleeding time (shed blood) and simultaneously from venous blood in 27 healthy human volunteers. In a subgroup, the same measurements were carried out before and 1 h after aspirin intake. MMP-2 was significantly higher in shed blood than in venous blood and increased progressively, consistent with ongoing platelet activation. A significant correlation was evident between platelet number and MMP-2 in shed blood; platelet MMP-2 content in shed blood was lower than that of platelets in venous blood. The level of active MMP-2 released by activated platelets in vivo was within the range of concentrations that potentiate platelet activation. Aspirin did not reduce MMP-2 release in vivo. In conclusion, MMP-2 is released from platelets in vivo in humans at a localised site of vessel wall damage in amounts sufficient to potentiate platelet aggregation; aspirin does not reduce this release.

journal_name

Br J Haematol

authors

Falcinelli E,Giannini S,Boschetti E,Gresele P

doi

10.1111/j.1365-2141.2007.06632.x

subject

Has Abstract

pub_date

2007-07-01 00:00:00

pages

221-30

issue

2

eissn

0007-1048

issn

1365-2141

pii

BJH6632

journal_volume

138

pub_type

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