Inhibition of human platelet aggregation by vitamin K.

Abstract:

:The effect of several vitamin K (Vit K) analogues on the aggregation of human platelets was examined. The analogues were potent inhibitors of aggregation induced by ADP, thrombin, collagen and arachidonate but were less active against aggregation induced by the calcium ionophore A23187. Vit K3 also prevented platelet membrane phosphatide breakdown induced by collagen. These effects were not due to a direct inhibition of enzymes involved in the liberation of arachidonate or its subsequent transformation. The analogues exerted no effects on enzymes regulating intraplatelet cAMP. However, these effects could be overcome by increasing extracellular Ca++ levels, indicating a possible interaction with Ca++ regulation in platelets.

journal_name

Thromb Res

journal_title

Thrombosis research

authors

Blackwell GJ,Radomski M,Moncada S

doi

10.1016/0049-3848(85)90037-4

subject

Has Abstract

pub_date

1985-01-01 00:00:00

pages

103-14

issue

1

eissn

0049-3848

issn

1879-2472

pii

0049-3848(85)90037-4

journal_volume

37

pub_type

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