Effect of platelet release products on cytosolic calcium in cardiac myocytes.

Abstract:

:The effect of platelet release products on cytosolic calcium [( Ca++]i) was examined by monitoring the fluorescence of chick embryonic heart cells loaded with the fluorescent calcium indicator indo-1 AM. Cell free filtrate of platelet release products was obtained from rabbit platelets activated with thrombin or collagen. This filtrate caused a rapid increase in both systolic and diastolic [Ca++]i in a dose-dependent manner. The effect was not blocked by pretreating the platelets with aspirin or a thromboxane synthetase inhibitor. It was not mimicked by a thromboxane analog, or by several substances known to be released from platelets including ADP, serotonin, or platelet activating factor. Apyrase or ATP-gamma S had no effect on the activity. The responsible product was heat-sensitive, trypsin-sensitive, and partitioned into the aqueous phase of a chloroform suspension. It has a low molecular weight (less than 3kD) and is sensitive to 2-mercaptoethanol. Protease inhibitor appears to prolong the activity. These results suggest that trypsin-sensitive peptide(s) released from activated platelets can increase [Ca++]i in cardiac cells.

authors

Chien WW,Mohabir R,Newman D,Leung LL,Clusin WT

doi

10.1016/0006-291x(90)90509-l

subject

Has Abstract

pub_date

1990-08-16 00:00:00

pages

1121-7

issue

3

eissn

0006-291X

issn

1090-2104

pii

0006-291X(90)90509-L

journal_volume

170

pub_type

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