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 Pharmacoljournal_title
European journal of pharmacologyauthors
Sage SO,Rink TJdoi
10.1016/0014-2999(86)90563-7subject
Has Abstractpub_date
1986-08-22 00:00:00pages
99-107issue
1-2eissn
0014-2999issn
1879-0712pii
0014-2999(86)90563-7journal_volume
128pub_type
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journal_title:European journal of pharmacology
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