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• W2077488185 abstract "1. The patch-clamp technique was used to characterize chloride channels from the apical membranes of bovine tracheal epithelial cells. Application of GTP gamma S or NaF to excised patches revealed the existence of a novel type of Cl- channel regulated by G-proteins in a membrane-delimited manner. 2. The channel had a linear current-voltage relationship, with a conductance of 100-120 pS. Its open probability was independent of voltage. 3. The channel was highly anion selective (permeability ratio, PNa/PCl = 0.06 +/- 0.04) and had the halide permeability sequence: I- > Br- > or = Cl- > F-, corresponding to the Eisenman I sequence. This suggested that neither ionic size nor diffusion rate determined ion permeation through the channel. 4. The mole fraction behaviour was studied using fluoride and chloride ions. Mixtures of ions produced currents that would be expected from the linear combination of the two ions acting independently, indicating relatively simple permeation through the pore and compatible with a single ion binding site. 5. The channel was inhibited by the stilbene disulphonates SITS (4-acetamido-4'-isothiocyanatostilbene-2, 2'-disulphonic acid) and DNDS (4,4'-dinitrostilbene-2,2'-sulphonic acid). SITS introduced voltage dependence to channel gating and indicated the possible involvement of lysine residues in the channel permeation pathway. 6. NaF was unable to activate Cl- channels in the presence of the aluminum chelator, deferoxamine mesylate. This indicates that Al3+ ions play an important role in chloride channel activation by fluoride. NaF activation was not dependent on the presence of calcium ions. 7. The channel was insensitive to alkaline phosphatase and to the specific inhibitors of protein phosphatase types I and 2A, okadaic acid and calyculin A. 8. The channels could be activated by GTP gamma S or by NaF in the presence of the phospholipase A2 inhibitor quinacrine, indicating that this enzyme is not involved in channel regulation." @default.
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• W2077488185 date "1995-11-15" @default.
• W2077488185 modified "2023-09-26" @default.
• W2077488185 title "Characterization and regulation of a chloride channel from bovine tracheal epithelium." @default.
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• W2077488185 doi "https://doi.org/10.1113/jphysiol.1995.sp021032" @default.
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