Fast adaptation of mechanoelectrical transducer channels in mammalian cochlear hair cells - PubMed (original) (raw)
Fast adaptation of mechanoelectrical transducer channels in mammalian cochlear hair cells
Helen J Kennedy et al. Nat Neurosci. 2003 Aug.
Abstract
Outer hair cells are centrally involved in the amplification and frequency tuning of the mammalian cochlea, but evidence about their transducing properties in animals with fully developed hearing is lacking. Here we describe measurements of mechanoelectrical transducer currents in outer hair cells of rats between postnatal days 5 and 18, before and after the onset of hearing. Deflection of hair bundles using a new rapid piezoelectric stimulator evoked transducer currents with ultra-fast activation and adaptation kinetics. Fast adaptation resembled the same process in turtle hair cells, where it is regulated by changes in stereociliary calcium. It is argued that sub-millisecond transducer adaptation can operate in outer hair cells under the ionic, driving force and temperature conditions that prevail in the intact mammalian cochlea.
Comment in
- Fast adaptation in the mammalian cochlea: a conserved mechanism for cochlear amplification.
Strassmaier M, Gillespie PG. Strassmaier M, et al. Nat Neurosci. 2003 Aug;6(8):790-1. doi: 10.1038/nn0803-790. Nat Neurosci. 2003. PMID: 12886223 No abstract available.
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