Adrenergic stimulation of regional plasminogen activator release in rabbits

W. L. Chandler, S. C. Loo, D. Mornin

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The purpose of this study was to determine whether different regions of the rabbit vascular system show variations in the rate of plasminogen activator (PA) secretion. To start, we evaluated the time course, dose response and adrenergic specificity of PA release. Infusion of 1 μg/kg of epinephrine stimulated a 116 ± 60% (SD) increase in PA activity that peaked 30 to 60 s after epinephrine administration. Infusion of 1 μg/kg of norepinephrine, isoproterenol and phenylephrine had no effect on PA activity. Pretreatment with phentolamine, an alpha adrenergic antagonist, blocked the release of PA by epinephrine while pretreatment with the beta blocker propranolol had no effect. This suggests that PA release in the rabbit was mediated by some form of alpha receptor. Significant arterio-venous differences in basal PA activity were found across the pulmonary and splanchnic vascular beds but not the lower extremity/pelvic bed. After stimulation with epinephrine, PA activity increased 46% across the splanchnic bed while no change was seen across the lower extremity/pelvic bed. We conclude that several vascular beds contribute to circulating PA activity in the rabbit, and that these beds secrete PA at different rates under both basal and stimulated conditions.

Original languageEnglish (US)
Pages (from-to)545-549
Number of pages5
JournalThrombosis and Haemostasis
Volume68
Issue number5
DOIs
StatePublished - 1992
Externally publishedYes

ASJC Scopus subject areas

  • Hematology

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