Density of motility-related charge in the outer hair cell of the guinea pig is inversely related to best frequency

Joseph Santos-Sacchi, Seiji Kakehata, Toshihiko Kikuchi, Yukio Katori, Tomonori Takasaka

Research output: Contribution to journalArticlepeer-review

73 Citations (Scopus)

Abstract

Whole cell voltage clamp and freeze fracture were used to study the electrophysiological and ultrastructural correlates of the outer hair cell (OHC) lateral membrane molecular motors. We find that specific voltage- dependent capacitance, which derives from motility-related charge movement, increases as cell length decreases. This increasing non-linear charge density predicts a corresponding increase in sensor-motor density. However, while OHC lateral membrane particle density increases, a quantitative correspondence is absent. Thus, the presumed equivalence of particle and motor is questionable. The data more importantly indicate that whereas the voltage driving OHC motility, i.e. the receptor potential, may decrease with frequency due to the OHC's low-pass membrane filter, the electrical energy (Q x V) supplied to the lateral membrane will tend to remain stable. This conservation of energy delivery is likely crucial for the function of the cochlear amplifier at high frequencies.

Original languageEnglish
Pages (from-to)155-158
Number of pages4
JournalNeuroscience Letters
Volume256
Issue number3
DOIs
Publication statusPublished - 1998 Nov 13

Keywords

  • Capacitance
  • Cochlea
  • Gating charge
  • Membranes
  • Motility
  • Outer hair cell

ASJC Scopus subject areas

  • Neuroscience(all)

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