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J Appl Physiol 62: 2404-2409, 1987;
8750-7587/87 $5.00
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Journal of Applied Physiology, Vol 62, Issue 6 2404-2409, Copyright © 1987 by American Physiological Society

ARTICLES

Neural control of contraction in isolated submucosal gland from feline trachea

S. Shimura, T. Sasaki, H. Okayama, H. Sasaki and T. Takishima

To determine the autonomic innervation to myoepithelial cells of submucosal gland, we applied electrical field stimulation (FS) to the intrinsic nerves in isolated submucosal glands from feline tracheae. FS induced contraction that was voltage or frequency dependent and abolished by pretreatment with tetrodotoxin. DMPP (1,1-dimethyl-4-phenylpiperazinium iodide) did not produce any significant contraction, and pretreatment with hexamethonium did not alter the response to FS. Atropine inhibited the contractile response to FS and neostigmine augmented the response to FS. Serotonin also augmented the response to FS, whereas the response to methacholine remained unchanged in the presence of serotonin. Phentolamine reduced the response to FS by 15% of control, whereas propranolol induced no significant changes in the response to FS. No significant inhibitory responses were observed by FS. Our findings indicate that the contraction of tracheal submucosal glands is mediated mainly by cholinergic nerves via muscarinic receptors and in small part by adrenergic nerves via alpha-receptors, and serotonin potentiates the contractile response to FS at the postganglionic nerve.


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[Abstract] [Full Text] [PDF]


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