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J Appl Physiol 75: 1171-1179, 1993;
8750-7587/93 $5.00
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Journal of Applied Physiology, Vol 75, Issue 3 1171-1179, Copyright © 1993 by American Physiological Society

ARTICLES

Isoproterenol antagonizes endothelial permeability induced by thrombin and thrombin receptor peptide

F. L. Minnear, M. A. DeMichele, S. Leonhardt, T. T. Andersen and M. Teitler
Department of Physiology and Cell Biology, Albany Medical College of Union University, New York 12208.

We determined whether 1) amino-terminal peptides of the thrombin receptor increase endothelial permeability to a comparable extent as alpha-thrombin does, 2) isoproterenol attenuates the thrombin-induced increase in endothelial permeability by an antagonistic action to that of thrombin or by lowering baseline permeability, and 3) isoproterenol decreases permeability via stimulation of the beta 2-adrenergic receptor. Permeability across monolayers of bovine pulmonary artery endothelial cells (CCL 209) was assessed by the clearance of 125I-labeled albumin. Thrombin receptor peptides increased permeability at 1 microM but required a dose of between 10 and 100 microM to equal the permeability response of 1 microM alpha-thrombin. Dose-response experiments demonstrated that isoproterenol antagonized the action of alpha-thrombin and a thrombin receptor peptide on endothelial permeability and that it lowered baseline permeability. This permeability-decreasing action of isoproterenol occurred via stimulation of the beta 2-adrenergic receptor. Terbutaline, a partial beta 2-agonist, prevented the thrombin-induced permeability, but dobutamine, a partial beta 1-agonist, did not. The active stereoisomer of terbutaline and the racemic form mimicked the action of isoproterenol, but the inactive stereoisomer had no effect. ICI-118,551, a specific beta 2-receptor antagonist, prevented the permeability-decreasing action of isoproterenol, whereas ICI-89,406, a specific beta 1-receptor antagonist, did not. Competitive binding studies of 125I-pindolol with ICI-118,551 or ICI-89,406 demonstrated the presence of beta-adrenergic receptors, predominantly beta 2-receptors, on cell membrane homogenates.(ABSTRACT TRUNCATED AT 250 WORDS)


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