Two K+ channel types, muscarinic agonist-activated and inwardly rectifying, in a Cl- secretory epithelium

The Avian salt gland

N. W. Richards, R. J. Lowy, S. A. Ernst, D. C. Dawson

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Pathces of membrane on cells isolated from the nasal salt gland of the domestic duck typically contained two types of K+ channel. One was a large-conductance ('maxi') K+ channel which was activated by intracellular calcium and/or depolarizing membrane voltages, and the other was a smaller-conductance K+ channel which exhibited at least two conductance levels and displayed pronounced inward rectification. Barium blocked both channels, but tetraethylammonium chloride and quinidine selectively blocked the larger K+ channel. The large K+ channel did not appear to open under resting conditions but could be activated by application of the muscarinic agonist, carbachol. The smaller channels were open under resting conditions but the gating was not affected by carbachol. Both of these channels reside in the basolateral membranes of the Cl- secretory cells but they appear to play different roles in the life of the cell.

Original languageEnglish (US)
Pages (from-to)1171-1194
Number of pages24
JournalJournal of General Physiology
Volume93
Issue number6
StatePublished - 1989
Externally publishedYes

Fingerprint

Salt Gland
Muscarinic Agonists
Carbachol
Epithelium
Large-Conductance Calcium-Activated Potassium Channels
Tetraethylammonium
Quinidine
Membranes
Ducks
Barium
Nose
Cell Membrane
Calcium

ASJC Scopus subject areas

  • Physiology

Cite this

Two K+ channel types, muscarinic agonist-activated and inwardly rectifying, in a Cl- secretory epithelium : The Avian salt gland. / Richards, N. W.; Lowy, R. J.; Ernst, S. A.; Dawson, D. C.

In: Journal of General Physiology, Vol. 93, No. 6, 1989, p. 1171-1194.

Research output: Contribution to journalArticle

Richards, N. W. ; Lowy, R. J. ; Ernst, S. A. ; Dawson, D. C. / Two K+ channel types, muscarinic agonist-activated and inwardly rectifying, in a Cl- secretory epithelium : The Avian salt gland. In: Journal of General Physiology. 1989 ; Vol. 93, No. 6. pp. 1171-1194.
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