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Small linear chloride channels are endogenous to nonepithelial cells.
S E Gabriel1, E M Price, R C Boucher
1Department of Medicine, University of North Carolina, Chapel Hill 27599.
The American Journal of Physiology
|September 1, 1992
Summary
Endogenous chloride channels in Sf9, 3T3, and CHO cells exhibit properties similar to cystic fibrosis transmembrane conductance regulator (CFTR) channels. These findings suggest previous studies may have misattributed CFTR activity to these native channels.
Area of Science:
- Cell biology
- Ion channel physiology
Background:
- Cystic fibrosis transmembrane conductance regulator (CFTR) is a crucial chloride channel.
- Characterizing endogenous channels is vital for understanding cellular ion transport.
Purpose of the Study:
- To investigate endogenous chloride channels in Sf9, 3T3, and Chinese hamster ovary (CHO) cells.
- To compare the properties of these endogenous channels with those of CFTR.
Main Methods:
- Utilized single-channel and whole-cell patch-clamp electrophysiology.
- Analyzed current-voltage relationships, conductance, and channel kinetics.
Main Results:
- Observed low-conductance (4-11 ps) anion channels in all tested cell types.
- These channels displayed linear current-voltage relationships and minimal time/voltage dependence.
- Properties closely resembled those of previously reported CFTR-associated channels.
Conclusions:
- Endogenous chloride channels are present in Sf9, 3T3, and CHO cells.
- These native channels may confound studies investigating expressed CFTR.
- Re-evaluation of previous CFTR studies is warranted due to potential contributions from endogenous channels.