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Abstract
The causes for reduced platelet thromboxane synthesis in patients with acquired platelet
storage pool disease are incompletely understood. The present study was designed to
define the nature of the defect(s) underlying diminished thromboxane synthesis in
human platelets previously exposed to thrombin in vitro. Platelets pretreated with
high concentrations of thrombin were unable to form measurable amounts of thromboxane
in response to a second stimulation with thrombin. In contrast, thrombin-pretreated
platelets formed additional thromboxane in response to arachidonate, collagen, or
A23,187. Thrombin pretreated platelets did not recover with respect to thrombin inducible
thromboxane synthesis when incubated for two hours in plasma either in the presence
or absence of added arachidonic acid. These observations suggest that neither inactivation
of cyclooxygenase nor depletion of endogenous arachidonic acid is responsible for
the impaired thrombin-induced thromboxane synthesis in thrombinprestimulated platelets.
Impaired thrombin-induced thromboxane synthesis in these platelets may be due to agonist-specific,
irreversible receptor uncoupling.
Keywords
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Article info
Publication history
Accepted:
September 30,
1987
Received:
August 27,
1987
Identification
Copyright
© 1987 Published by Elsevier Inc.