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Intracellular mechanisms in the activation of human platelets by low-density lipoproteins.


ABSTRACT: Low-density lipoproteins (LDL) have been shown to cause aggregation of human blood platelets at concentrations above 2 g of protein/l. The secretion of the contents of platelet dense granules was detected, but not that of the lysosomes. LDL gave rise to a mobilization of [3H]arachidonic acid from phospholipids and the appearance of products of the cyclo-oxygenase pathway after only 10 s. LDL-promoted aggregation was inhibited by both aspirin and indomethacin. There was an increase in 3H-labelled diacylglycerols and the phosphorylation of 47 kDa proteins. LDL therefore shares at least some of the mechanisms of stimulus/response coupling with those of other agonists.

SUBMITTER: Andrews HE 

PROVIDER: S-EPMC1147741 | biostudies-other | 1987 Mar

REPOSITORIES: biostudies-other

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