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. 1991 Dec;104(4):1050–1056. doi: 10.1111/j.1476-5381.1991.tb12548.x

Endothelin-1 inhibits pre-stimulated tracheal submucosal gland secretion and epithelial albumin transport.

E Yurdakos 1, S E Webber 1
PMCID: PMC1908815  PMID: 1810592

Abstract

1. Endothelin-1 potently contracts smooth muscle, including that in the airways. However, its effect on airway mucosal function has not so far been studied. 2. We have used the ferret whole trachea in vitro to examine the effect of endothelin-1 on tracheal smooth muscle tone, transepithelial potential difference (p.d.), submucosal gland secretion (including lysozyme secretion from serous cells) and active epithelial albumin transport. In addition we have examined the effects of endothelin on submucosal gland secretion and albumin transport pre-stimulated with the muscarinic agonist methacholine and the alpha-adrenoceptor agonist phenylephrine. The effects of the Ca2+ channel blocker nifedipine on the responses to endothelin have also been assessed. 3. Endothelin (0.1-100 nM) produced concentration-dependent increases in intraluminal tracheal pressure indicating smooth muscle contraction, and in the negativity of the transepithelial p.d. These effects were partially inhibited by nifedipine (10 microM). 4. Endothelin (0.01-100 nM) had no significant effect on baseline rates of mucus, lysozyme or albumin outputs, but produced concentration-dependent reductions in maintained methacholine- and phenylephrine-induced mucus, lysozyme and albumin outputs. In general endothelin was more potent against methacholine-induced effects. All of the concentration-response curves for endothelin were shallow and some appeared to be biphasic, suggesting the possibility of more than one mechanism of action of endothelin. 5. The effects of endothelin (at concentrations greater than 1 nM) on phenylephrine-induced mucus volume, lysozyme and albumin outputs were significantly inhibited by nifedipine. Similarly the effect of endothelin (greater than 1 nM) on methacholine-induced mucus volume and albumin outputs (but not lysozyme output) was attenuated by nifedipine.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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