Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies
The effects of a wide range of Prostacyclin (PGI2) concentrations on the Isometric Developed Tension (IDT) of isolated left auricles driven at different frequencies (0.8, 1.6 or 3.3 Hz) were explored. A comparison of the positive inotropism of PGI2, norepinephrine (NE), tyramine and phenylephrine (P...
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todo:paper_00281298_v313_n2_p95_SterinBorda2023-10-03T14:38:41Z Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies Sterin-Borda, L. Canga, L. Borda, E.S. Gimeno, M.F. Gimeno, A.L. Catecholamines Inotropic Effect Myocarium PGI2 Rate of Contraction 3',4' dihydroxy 2 methylpropiophenone cocaine noradrenalin normetadrenalin oxidopamine phenylephrine propranolol prostacyclin tyramine animal experiment controlled study drug comparison drug response heart heart atrium heart muscle contractility heart rate in vitro study inotropism rat Animals Cocaine Epoprostenol Heart Rate Male Myocardial Contraction Norepinephrine Phenylephrine Propranolol Prostaglandins Rats Stimulation, Chemical Sympathetic Nervous System Tyramine The effects of a wide range of Prostacyclin (PGI2) concentrations on the Isometric Developed Tension (IDT) of isolated left auricles driven at different frequencies (0.8, 1.6 or 3.3 Hz) were explored. A comparison of the positive inotropism of PGI2, norepinephrine (NE), tyramine and phenylephrine (Phenyl) indicated that PGI2, NE and tyramine enhanced peak tension significantly less at slow (0.8 and 1.6 Hz) than at higher rates (3.3 Hz); whereas Phenyl augmented equally the IDT at all of these three driving frequencies. The positive inotropism evoked by PGI2 was inhibited by (-)-propranolol and also by a treatment with 6-OHDA. Cocaine, normetanephrine and U-0521, augmented the positive inotropic influence of PGI2 on atria paced at a slow rate (0.8 Hz) but not at a faster one (3.3 Hz). These results suggest that the action of PGI2 on atrial contractions is apparently indirect and mediated by the release of tissue catecholamines. In addition the effect of PGI2 and NE at slow and fast rates appears associated with a different relative relevance of the processes which terminate the action of added sympathomimetic agonists, namely, neuronal or extraneuronal uptake as well as metabolization via COMT. These mechanisms seen to be more prominent at slower driving frequencies and could explain the diminished effect of PGI2 and NE on slowly paced atria. © 1980 Springer-Verlag. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00281298_v313_n2_p95_SterinBorda |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
Catecholamines Inotropic Effect Myocarium PGI2 Rate of Contraction 3',4' dihydroxy 2 methylpropiophenone cocaine noradrenalin normetadrenalin oxidopamine phenylephrine propranolol prostacyclin tyramine animal experiment controlled study drug comparison drug response heart heart atrium heart muscle contractility heart rate in vitro study inotropism rat Animals Cocaine Epoprostenol Heart Rate Male Myocardial Contraction Norepinephrine Phenylephrine Propranolol Prostaglandins Rats Stimulation, Chemical Sympathetic Nervous System Tyramine |
| spellingShingle |
Catecholamines Inotropic Effect Myocarium PGI2 Rate of Contraction 3',4' dihydroxy 2 methylpropiophenone cocaine noradrenalin normetadrenalin oxidopamine phenylephrine propranolol prostacyclin tyramine animal experiment controlled study drug comparison drug response heart heart atrium heart muscle contractility heart rate in vitro study inotropism rat Animals Cocaine Epoprostenol Heart Rate Male Myocardial Contraction Norepinephrine Phenylephrine Propranolol Prostaglandins Rats Stimulation, Chemical Sympathetic Nervous System Tyramine Sterin-Borda, L. Canga, L. Borda, E.S. Gimeno, M.F. Gimeno, A.L. Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| topic_facet |
Catecholamines Inotropic Effect Myocarium PGI2 Rate of Contraction 3',4' dihydroxy 2 methylpropiophenone cocaine noradrenalin normetadrenalin oxidopamine phenylephrine propranolol prostacyclin tyramine animal experiment controlled study drug comparison drug response heart heart atrium heart muscle contractility heart rate in vitro study inotropism rat Animals Cocaine Epoprostenol Heart Rate Male Myocardial Contraction Norepinephrine Phenylephrine Propranolol Prostaglandins Rats Stimulation, Chemical Sympathetic Nervous System Tyramine |
| description |
The effects of a wide range of Prostacyclin (PGI2) concentrations on the Isometric Developed Tension (IDT) of isolated left auricles driven at different frequencies (0.8, 1.6 or 3.3 Hz) were explored. A comparison of the positive inotropism of PGI2, norepinephrine (NE), tyramine and phenylephrine (Phenyl) indicated that PGI2, NE and tyramine enhanced peak tension significantly less at slow (0.8 and 1.6 Hz) than at higher rates (3.3 Hz); whereas Phenyl augmented equally the IDT at all of these three driving frequencies. The positive inotropism evoked by PGI2 was inhibited by (-)-propranolol and also by a treatment with 6-OHDA. Cocaine, normetanephrine and U-0521, augmented the positive inotropic influence of PGI2 on atria paced at a slow rate (0.8 Hz) but not at a faster one (3.3 Hz). These results suggest that the action of PGI2 on atrial contractions is apparently indirect and mediated by the release of tissue catecholamines. In addition the effect of PGI2 and NE at slow and fast rates appears associated with a different relative relevance of the processes which terminate the action of added sympathomimetic agonists, namely, neuronal or extraneuronal uptake as well as metabolization via COMT. These mechanisms seen to be more prominent at slower driving frequencies and could explain the diminished effect of PGI2 and NE on slowly paced atria. © 1980 Springer-Verlag. |
| format |
JOUR |
| author |
Sterin-Borda, L. Canga, L. Borda, E.S. Gimeno, M.F. Gimeno, A.L. |
| author_facet |
Sterin-Borda, L. Canga, L. Borda, E.S. Gimeno, M.F. Gimeno, A.L. |
| author_sort |
Sterin-Borda, L. |
| title |
Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| title_short |
Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| title_full |
Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| title_fullStr |
Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| title_full_unstemmed |
Inotropic effect of prostacyclin (PGI2) on isolated rat atria at different contraction frequencies |
| title_sort |
inotropic effect of prostacyclin (pgi2) on isolated rat atria at different contraction frequencies |
| url |
http://hdl.handle.net/20.500.12110/paper_00281298_v313_n2_p95_SterinBorda |
| work_keys_str_mv |
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