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Fast Adaptation and Ca2+ Sensitivity of theMechanotransducer Require Myosin-XVa in Inner But Not Outer Cochlear Hair Cells.
- Source :
-
Journal of Neuroscience . 4/1/2009, Vol. 29 Issue 13, p4023-4034. 12p. 10 Graphs. - Publication Year :
- 2009
-
Abstract
- In inner ear hair cells, activation of mechanotransduction channels is followed by extremely rapid deactivation that depends on the influx of Ca2+ through these channels. Although the molecular mechanisms of this "fast" adaptation are largely unknown, the predominant models assume Ca22+ sensitivity as an intrinsic property of yet unidentified mechanotransduction channels. Here, we examined mechanotransduction in the hair cells of young postnatal shaker 2 mice (Myo15sh2/sh2). These mice have no functional myosin-XVa, which is critical for normal growth of mechanosensory stereocilia of hair cells. Although stereocilia of both inner and outer hair cells of Myo15sh2/sh2 mice lack myosin-XVa and are abnormally short, these cells have dramatically different hair bundle morphology. Myo15sh2/sh2 outer hair cells retain a staircase arrangement of the abnormally short stereocilia and prominent tip links. Myo15sh2/sh2 inner hair cells do not have obliquely oriented tip links, and their mechanosensitivity is mediated exclusively by "top-to-top" links between equally short stereocilia. In both inner and outer hair cells of Myo15sh2/sh2 mice, we found mechanotransduction responses with a normal "wild-type" amplitude and speed of activation. Surprisingly, only outer hair cells exhibit fast adaptation and sensitivity to extracellular Ca22+. In Myo15sh2/sh2 inner hair cells, fast adaptation is disrupted and the transduction current is insensitive to extracellular Ca22+.We conclude that the Ca22+ sensitivity of the mechanotransduction channels and the fast adaptation require a structural environment that is dependent on myosin-XVa and is disrupted in Myo15sh2/sh2 inner hair cells, but not in Myo15sh2/sh2 outer hair cells. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 02706474
- Volume :
- 29
- Issue :
- 13
- Database :
- Academic Search Index
- Journal :
- Journal of Neuroscience
- Publication Type :
- Academic Journal
- Accession number :
- 37599246
- Full Text :
- https://doi.org/10.1523/JNEUROSCI.4566-08.2009