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Direct evidence for the modulation of human platelet cytosolic free Ca2+ by intracellular cyclic AMP produced with a photoactivatable derivative.

Abstract：

:We have previously reported that intraplatelet "cyclic AMP jumps" produced with newly synthesized photoactivatable cyclic AMP analogue, inhibited washed rat platelet aggregation and serotonin release as induced by thrombin. Using the same approach on human platelets, thrombin-induced platelet aggregation was dose-dependently inhibited only when a flash was delivered. The mechanism of action of intraplatelet cyclic AMP as resulting from photolysis could be by controlling the level of cytosolic Ca2+. In order to test this hypothesis, the same protocol was used on human platelets preloaded with the internal Ca2+ fluorescent indicator, Quin 2, we found that the extent and the rate of the rise of the cytosolic Ca2+ induced by thrombin were dramatically decreased, in the presence of the photoactivatable cyclic AMP, only following photoirradiation. In addition, the flashes were produced, in the presence of photoactivatable cyclic AMP, after the thrombin-induced rise of internal Ca2+ had reached its peak. In these conditions, photoirradiation caused a rapid fall in fluorescence. These experiments provide the first direct evidence that intracellular cyclic AMP is involved in the control of platelet cytosolic Ca2+ by inhibition of its mobilization and by stimulation of its sequestration.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Blache D,Ciavatti M,Ponsin G,Nargeot J

doi

10.1016/0006-291x(87)90728-5

subject

Has Abstract

pub_date

1987-07-15 00:00:00

pages

321-31

issue

1

eissn

0006-291X

issn

1090-2104

pii

0006-291X(87)90728-5

journal_volume

146

pub_type

杂志文章

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