Publication Date:
1980-04-11
Description:
In cats anesthetized with chloralose-pentobarbital and artificially ventilated, electrical stimulation of the caudal end of the cut cervical vagus nerve has a biphasic effect on the bronchoconstriction induced by an intravenous infusion of serotonin. The response consists of a brief augmentation of bronchoconstriction followed by relatively prolonged bronchodilation. After muscarinic receptor blockade with atropine, vagal stimulation causes only bronchodilation. Vagally mediated bronchodilation is not affected by beta adrenergic blockade with propranolol, alpha adrenergic blockade with phenoxybenzamine, or adrenergic neuronal blockade with guanethidine, but is abolished by autonomic ganglionic blockade with hexamethonium. These findings support the conclusion that a nonadrenergic inhibitory nervous system is present in the pulmonary airways of the cat and that the system is supplied by preganglionic fibers in the cervical vagus nerves.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Diamond, L -- O'Donnell, M -- New York, N.Y. -- Science. 1980 Apr 11;208(4440):185-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7361114" target="_blank"〉PubMed〈/a〉
Keywords:
Airway Resistance/drug effects
;
Animals
;
Cats/anatomy & histology/*physiology
;
Electric Stimulation
;
Female
;
Guanethidine/pharmacology
;
Hexamethonium Compounds/pharmacology
;
Lung/*innervation
;
Lung Compliance/drug effects
;
Neural Pathways/physiology
;
Parasympathetic Nervous System/physiology
;
Phenoxybenzamine/pharmacology
;
Propranolol/pharmacology
;
Serotonin/pharmacology
;
Sympathetic Nervous System/physiology
;
Vagotomy
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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