Journal of Applied Physiology AJP: Renal Physiology
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J Appl Physiol 65: 1895-1901, 1988;
8750-7587/88 $5.00
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Journal of Applied Physiology, Vol 65, Issue 4 1895-1901, Copyright © 1988 by American Physiological Society

ARTICLES

Regulation of ciliary beat frequency by autonomic mechanisms: in vitro

L. B. Wong, I. F. Miller and D. B. Yeates
Department of Medicine, University of Illinois, Chicago 60680.

The ciliated epithelium of the mammalian trachea separates the neurohumoral milieu of the tissue from that of the environment of the airway lumen. To determine whether specific autonomic receptors regulating ciliary beat frequency (CBF) were located on mucosal or serosal sides, we measured CBF by heterodyne mode correlation analysis laser light scattering in bovine tracheal tissues mounted in a two-sided chamber. A beta 2-adrenergic agonist, fenoterol, at 10(-7) M, stimulated serosal CBF from 7.9 +/- 1.3 to 20.2 +/- 5.8 Hz (P less than 0.01) and mucosal CBF from 6.6 +/- 0.9 to 14.7 +/- 4.6 Hz (P less than 0.01). A muscarinic cholinergic agonist, methacholine, at 10(-7) M, increased mucosal CBF from 8.4 +/- 1.0 to 19.5 +/- 5.5 Hz (P less than 0.01) and serosal CBF from 8.0 +/- 0.9 to 15.4 +/- 5.0 Hz (P less than 0.01). The differences in stimulation of CBF on the mucosal and serosal sides between fenoterol and methacholine were significant (P less than 0.01). Studies in which these autonomic agonist stimulating effects were inhibited by their respective antagonists, propranolol and atropine sulfate, demonstrated that CBF can be regulated independently by mediators both in the submucosa and within the mucus lining.


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