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• W1990107804 abstract "Developmental changes in electrophysiological membrane properties of mouse cochlear inner hair cells (IHCs) were studied from just after terminal differentiation up to functional maturity. As early as embryonic day 14.5 (E14.5) newly differentiated IHCs express a very small outward K+ current that is largely insensitive to 4-aminopyridine (4-AP). One day later the inward rectifier, IK1, is first observed. These immature cells initially exhibit only slow graded voltage responses under current clamp. From E17.5 spontaneous action potentials occur. During the first week of postnatal development, the outward K+ current steadily increases in size and a progressively larger fraction of the current is sensitive to 4-AP. During the second postnatal week, the activation of the 4-AP-sensitive current, by now contributing about half of the outward K+ current, shifts in the hyperpolarizing direction. Together with an increase in size of IK1, this hyperpolarizes the cell, thus inhibiting the spontaneous spike activity, although spikes could still be evoked upon depolarizing current injection. Starting at about the onset of hearing (postnatal day 12, P12) immature IHCs make the final steps towards fully functional sensory receptors with fast graded voltage responses. This is achieved mainly by the expression of the large-conductance Ca2+-activated K+ current IK,f, but also of a current indistinguishable from the negatively activating IK,n previously described in mature outer hair cells (OHCs). The 4-AP-sensitive current continues to increase after the onset of hearing to form the major part of the mature delayed rectifier, IK,s. By P20 IHCs appear mature in terms of their complement of K+ conductances." @default.
• W1990107804 created "2016-06-24" @default.
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• W1990107804 date "2003-04-01" @default.
• W1990107804 modified "2023-10-11" @default.
• W1990107804 title "Developmental changes in the expression of potassium currents of embryonic, neonatal and mature mouse inner hair cells" @default.
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• W1990107804 doi "https://doi.org/10.1111/j.1469-7793.2003.00383.x" @default.
• W1990107804 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/2342842" @default.
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