title: Pharmacological actions of a new  -adrenoceptor agonist, MJ-9184-1, in anaesthetized cats.
abstract: 1. The effects of (-)-isoprenaline and the new beta-adrenoceptor agonist, MJ-9184-1, on the lungs, on the cardiovascular system, and on slow contracting skeletal muscle have been compared in cats under chloralose anaesthesia.2. Both amines reduced the increases in airways resistance produced by 5-HT, depressed incomplete tetanic contractions of the soleus muscle, lowered the blood pressure and produced an increase in heart rate. In comparison with (-)-isoprenaline, MJ-9184-1 had a long duration of action.3. The effects of MJ-9184-1 and (-)-isoprenaline were antagonized by the beta-adrenoceptor antagonist, propranolol.4. MJ-9184-1 was approximately half as potent as (-)-isoprenaline in its effects on pulmonary resistance and soleus muscle contractility, and one seventh as potent in producing chronotropic effects in the heart.5. These results suggest that MJ-9184-1 possesses some specificity as a beta(2) receptor stimulant.
mesh_terms: D000318:Adrenergic beta-Agonists / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D000403:Airway Resistance / Q000187:drug effects; D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D001980:Bronchi / Q000187:drug effects; D002319:Cardiovascular System / Q000187:drug effects*; D002415:Cats; D004983:Ethanolamines / Q000494:pharmacology*; D005260:Female; D006339:Heart Rate / Q000187:drug effects; D007545:Isoproterenol / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D008168:Lung / Q000187:drug effects*; D008297:Male; D009119:Muscle Contraction / Q000187:drug effects*; D009130:Muscle, Smooth / Q000187:drug effects; D012702:Serotonin Antagonists; D013449:Sulfonamides / Q000494:pharmacology
chemical_list: D000318:Adrenergic beta-Agonists; D004983:Ethanolamines; D012702:Serotonin Antagonists; D013449:Sulfonamides; C002904:zinterol; D007545:Isoproterenol