Abnormal ion permeation through cystic fibrosis respiratory epithelium.

Abstract

The epithelium of nasal tissue excised from subjects with cystic fibrosis exhibited higher voltage and lower conductance than tissue from control subjects. Basal sodium ion absorption by cystic fibrosis and normal nasal epithelia equaled the short-circuit current and was amiloride-sensitive. Amiloride induced chloride ion secretion in normal but not cystic fibrosis tissue and consequently was more effective in inhibiting the short-circuit current in cystic fibrosis epithelia. Chloride ion-free solution induced a smaller hyperpolarization of cystic fibrosis tissue. The increased voltage and amiloride efficacy in cystic fibrosis reflect absorption of sodium ions across an epithelium that is relatively impermeable to chloride ions.

• Authors: M R Knowles, M J Stutts, A Spock, N Fischer, J T Gatzy, R C Boucher
• Journal: Science (New York, N.Y.) (Science) Vol. 221 Issue 4615 Pg. 1067-70 (Sep 09 1983) ISSN: 0036-8075 [Print] United States
• PMID: 6308769 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't, Research Support, U.S. Gov't, P.H.S.)

Chemical References

• Chlorides
• Ion Channels
• Amiloride
• Sodium

Topics

• Absorption
• Amiloride (pharmacology)
• Chlorides (metabolism)
• Cystic Fibrosis (metabolism)
• Humans
• Ion Channels (metabolism)
• Nasal Mucosa (metabolism)
• Sodium (metabolism)