Effects of ionic substitution on [Ca2+]i rises evoked by thrombin and PAF in human platelets.

Abstract:

:We have investigated the effects of substituting extracellular Na+ by choline or K+ on responses of quin2- and fura-2-loaded human platelets to thrombin and platelet-activating factor (PAF). Na+ substitution by choline did not affect the extent of the rise in [Ca2+]i evoked by either agonist. The response to thrombin, but not PAF, was slightly slowed. High K+ did not activate the cells, but the rises in [Ca2+]i evoked by both agonists were slowed and reduced. Shape change evoked by both agonists was little affected by either substitution. Aggregation evoked by PAF was reduced in high K+ but unaffected in choline. Thrombin-induced aggregation was unaffected by either substitution, even when the rise in [Ca2+]i was markedly reduced. The results suggest that the mechanism which generates Ca2+ fluxes in platelets is not voltage-dependent; but high K+ appears to interfere with the influx mechanism.

journal_name

Eur J Pharmacol

authors

Sage SO,Rink TJ

doi

10.1016/0014-2999(86)90563-7

subject

Has Abstract

pub_date

1986-08-22 00:00:00

pages

99-107

issue

1-2

eissn

0014-2999

issn

1879-0712

pii

0014-2999(86)90563-7

journal_volume

128

pub_type

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