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Science 1 August 1986:
Vol. 233. no. 4763, pp. 558 - 560
DOI: 10.1126/science.2425436
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Articles

Science, Vol 233, Issue 4763, 558-560
Copyright © 1986 by American Association for the Advancement of Science

articles

Altered regulation of airway epithelial cell chloride channels in cystic fibrosis

RA Frizzell, G Rechkemmer, and RL Shoemaker

In many epithelial cells the chloride conductance of the apical membrane increases during the stimulation of electrolyte secretion. Single-channel recordings from human airway epithelial cells showed that beta-adrenergic stimulation evoked apical membrane chloride channel activity, but this response was absent in cells from patients with cystic fibrosis (CF). However, when membrane patches were excised from CF cells into media containing sufficient free calcium (approximately 180 nanomolar), chloride channels were activated. The chloride channels of CF cells were similar to those of normal cells as judged by their current-voltage relations, ion selectivity, and kinetic behavior. These findings demonstrate the presence of chloride channels in the apical membranes of CF airway cells. Their regulation by calcium appears to be intact, but cyclic adenosine monophosphate (cAMP)-dependent control of their activity is defective.


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