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Inhibition of aggregation of rabbit and human platelets induced by adrenaline and 5-hydroxytryptamine by KB-R7943, a Na(+)/Ca(2+) exchange inhibitor.

Abstract：

:1. We investigated the effect of KB-R7943, a Na(+)/Ca(2+) exchange inhibitor, on the aggregation response induced by adrenaline and 5-hydroxytryptamine (5-HT), alone or in combination in human and rabbit platelets in the presence or absence of ouabain. 2. KB-R7943 inhibited aggregation induced by the combination of adrenaline and 5-HT in a concentration-dependent manner. The IC(50) values of KB-R7943 were 4.2+/-2.0 or 3.0+/-0.7 microM with washed rabbit platelets with or without ouabain pretreatment, respectively. 3. In platelet-rich human plasma, the aggregation was biphasic. The IC(50) value of KB-R7943 was 17.2+/-4.4 microM for the first phase aggregation. 4. KB-R7943 did not inhibit the first phase of aggregation induced by adrenaline alone, or the monophasic aggregation induced by 5-HT alone. 5. The aggregation of rabbit platelets depended on the presence of K(+) in the medium, and K(+)-dependent and K(+)-independent Ca(2+) influx were observed in resting platelets. Ouabain treatment increased only the K(+)-dependent but not the K(+)-independent Ca(2+) influx. 6. KB-R7943 inhibited K(+)-dependent Ca(2+) influx with or without ouabain pretreatment, but not K(+)-independent Ca(2+) influx. 7. From these results, we conclude that KB-R7943 inhibits the adrenaline plus 5-HT induced aggregation of rabbit and human platelets by inhibiting K(+)-dependent Na(+)/Ca(2+) exchange (NCKX). Our results suggest that NCKX plays an important role in platelet aggregation.

journal_name

Br J Pharmacol

journal_title

British journal of pharmacology

authors

Takano S,Kimura J,Ono T

doi

10.1038/sj.bjp.0703928

subject

Has Abstract

pub_date

2001-04-01 00:00:00

pages

1383-8

issue

7

eissn

0007-1188

issn

1476-5381

journal_volume

132

pub_type

杂志文章

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