Coronary artery cyclic AMP content during adrenergic receptor stimulation
| Autor: | CL Seidel, HV Sparks, RL Schnarr |
|---|---|
| Rok vydání: | 1975 |
| Předmět: |
medicine.medical_specialty
Contraction (grammar) Adrenergic receptor Epinephrine Stimulation Propranolol Phenylephrine Phentolamine Dogs Physiology (medical) Internal medicine medicine Cyclic AMP Animals Dose-Response Relationship Drug Chemistry Muscle Smooth Aminophylline Coronary Vessels Myocardial Contraction Stimulation Chemical Receptors Adrenergic Coronary arteries Endocrinology medicine.anatomical_structure Bucladesine medicine.drug |
| Zdroj: | The American journal of physiology. 229(2) |
| ISSN: | 0002-9513 |
| Popis: | The purpose of this study was to test the hypothesis that the mechanical response of coronary smooth muscle following adrenergic receptor stimulation was mediated by changes in cyclic AMP content. Dibutyryl cyclic AMP caused relaxation of coronary artery strips. Aminophyline caused relaxation and a 254% elevation of cyclic AMP content (P less than 0.005). Phenylephrine caused contraction but no significant change in cyclic AMP content (P greater than 0.4). Epinephrine alone caused contraction and a 99% elevation of cyclic AMP content (P less than 0.001). The alpha blocker, phentolamine, reversed the mechanicaal response to epinephrine, but it did not significantly (P greater than 0.15) reduce the effect of epinephrine on cyclic AMP content. Propranolol enhanced the contractile response to epinephrine and attenuated the epinephrine-induced increase in cyclic AMP content. These results suggest that the contraction of coronary arteries associated with alpha-receptor stimulation is not mediated by changes in cyclic AMP content; however, relaxation associated with beta-receptor stimulation may be mediated by an increase in cyclic AMP content. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|