Journal article
Evidence for basolateral membrane potassium conductance in canine tracheal epithelium
The American journal of physiology, Vol.244(5), pp.C377-384
05/1983
DOI: 10.1152/ajpcell.1983.244.5.C377
PMID: 6846526
Abstract
The ionic dependence of the basolateral membrane conductance in canine tracheal epithelium was investigated using intracellular microelectrode techniques. Increasing the K+ concentration in the submucosal bathing solution depolarized the electrical potential difference across the basolateral membrane; neither alteration of the submucosal Na+ concentration nor the mucosal K+ concentration had a significant effect on the cellular electrical potential profile. An increase in the K+ concentration in the submucosal bathing solution also decreased the net rate of Cl-secretion. Addition of ouabain (10(-4) M) to the submucosal bathing solution decreased the short-circuit current and depolarized the intracellular voltage without altering transepithelial resistance or the cell membrane resistance ratio, suggesting that basolateral resistance was unchanged. These findings, together with the previous observation that there is no appreciable basolateral Cl- conductance, indicate that a K+ conductance accounts for the predominance of the electrical conductance at the basolateral membrane. The results also indicate that the basolateral membrane K+ conductance plays a critical role in the generation of the negative intracellular voltage that drives Cl- exit across the apical membrane and thus supports Cl- secretion.
Details
- Title: Subtitle
- Evidence for basolateral membrane potassium conductance in canine tracheal epithelium
- Creators
- Michael J Welsh
- Resource Type
- Journal article
- Publication Details
- The American journal of physiology, Vol.244(5), pp.C377-384
- DOI
- 10.1152/ajpcell.1983.244.5.C377
- PMID
- 6846526
- NLM abbreviation
- Am J Physiol
- ISSN
- 0002-9513
- eISSN
- 2163-5773
- Publisher
- United States
- Grant note
- HL-14388 / NHLBI NIH HHS HL-07159 / NHLBI NIH HHS
- Language
- English
- Date published
- 05/1983
- Academic Unit
- Neurology; Molecular Physiology and Biophysics; Pulmonary, Critical Care, and Occupational Medicine; Fraternal Order of Eagles Diabetes Research Center; Neurosurgery; Internal Medicine
- Record Identifier
- 9984020730302771
Metrics
24 Record Views