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Norepinephrine induces lung vascular prostacyclin synthesis via alpha 1-adrenergic receptors.
- Source :
-
Journal of applied physiology (Bethesda, Md. : 1985) [J Appl Physiol (1985)] 1989 Jul; Vol. 67 (1), pp. 330-8. - Publication Year :
- 1989
-
Abstract
- Sympathetic nerve stimulation can cause pulmonary vasoconstriction related to norepinephrine (NE) release. Because of recent reports that NE caused prostacyclin (PGI2) release from systemic arteries, we wondered whether NE caused pulmonary vascular PGI2 release and whether a feedback mechanism existed whereby PGI2 modulated NE-induced vasoconstriction. NE-induced PGI2 synthesis in rat main pulmonary artery rings was larger than that induced by KCl, passive stretch, or a thromboxane analogue, was alpha-adrenergic receptor dependent, and was enhanced by endothelium removal. The NE-induced PGI2 synthesis was not tightly coupled to the magnitude of the pulmonary artery ring contractile response, and inhibition of NE-induced PGI2 production by cyclooxygenase blockade in either the pulmonary artery ring preparation or in isolated rat lungs perfused with a physiological solution did not augment the magnitude of the contractile response. We concluded that NE is a potent stimulus for PGI2 synthesis in the rat main pulmonary artery ring and in the rat lung, yet PGI2 is not important as a modulator of NE-induced vasoconstriction in the rat lung.
- Subjects :
- 6-Ketoprostaglandin F1 alpha biosynthesis
Animals
In Vitro Techniques
Indomethacin pharmacology
Male
Nitroprusside pharmacology
Propranolol pharmacology
Pulmonary Artery metabolism
Rats
Rats, Inbred Strains
Epoprostenol biosynthesis
Norepinephrine pharmacology
Pulmonary Artery drug effects
Receptors, Adrenergic, alpha physiology
Subjects
Details
- Language :
- English
- ISSN :
- 8750-7587
- Volume :
- 67
- Issue :
- 1
- Database :
- MEDLINE
- Journal :
- Journal of applied physiology (Bethesda, Md. : 1985)
- Publication Type :
- Academic Journal
- Accession number :
- 2547750
- Full Text :
- https://doi.org/10.1152/jappl.1989.67.1.330