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- W2079071744 abstract "Cochlear and type I vestibular hair cells of mammals express negatively activating potassium (K(+)) conductances, called g(K,n) and g(K,L) respectively, which are important in setting the hair cells' resting potentials and input conductances. It has been suggested that the channels underlying both conductances include KCNQ4 subunits from the KCNQ family of K(+) channels. In whole-cell recordings from rat hair cells, we found substantial differences between g(K,n) and g(K,L) in voltage dependence, kinetics, ionic permeability, and stability during whole-cell recording. Relative to g(K,L), g(K,n) had a significantly broader and more negative voltage range of activation and activated with less delay and faster principal time constants over the negative part of the activation range. Deactivation of g(K,n) had an unusual sigmoidal time course, while g(K,L) deactivated with a double-exponential decay. g(K,L), but not g(K,n), had appreciable permeability to Cs(+). Unlike g(K,L), g(K,n)'s properties did not change (wash out) during the replacement of cytoplasmic solution with pipette solution during ruptured-patch recordings. These differences in the functional expression of g(K,n) and g(K,L) channels suggest that there are substantial differences in their molecular structure as well." @default.
- W2079071744 created "2016-06-24" @default.
- W2079071744 creator A5025723438 @default.
- W2079071744 creator A5070915244 @default.
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- W2079071744 date "2004-06-24" @default.
- W2079071744 modified "2023-10-15" @default.
- W2079071744 title "Differences Between the Negatively Activating Potassium Conductances of Mammalian Cochlear and Vestibular Hair Cells" @default.
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- W2079071744 doi "https://doi.org/10.1007/s10162-004-4051-4" @default.
- W2079071744 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2504553" @default.
- W2079071744 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/15492886" @default.
- W2079071744 hasPublicationYear "2004" @default.
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