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Am J Physiol Regul Integr Comp Physiol 276: R943-R953, 1999;
0363-6119/99 $5.00
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Vol. 276, Issue 4, R943-R953, April 1999

Electrical response properties of avian lagena type II hair cells: a model system for vestibular filtering

Anthony J. Ricci1 and Manning J. Correia1,2

Departments of 1 Otolaryngology and 2 Physiology and Biophysics, University of Texas Medical Branch at Galveston, Galveston, Texas 77555-1031

Data presented represent the first electrical recordings from avian lagena type II hair cells. The perforated-patch variant of the whole cell recording technique was used to investigate how the macroscopic currents shaped the voltage response of the hair cells. Voltage-clamp data separated cells into two broad classes on the basis of differences in activation rates, rates and degree of inactivation, and pharmacological sensitivity. Current-clamp recordings revealed low-quality membrane voltage oscillations (Qc < 1) during pulse current injections. Oscillation frequency correlated with activation rate of the macroscopic currents. The quality of membrane oscillations (Qc) varied linearly with frequency for cells with little inactivation. For cells with rapid inactivation, no relationship was found between Qc and frequency. Rapid inactivation may serve to extend the bandwidth of vestibular hair cells. The frequency measured from voltage responses to pulsed currents may reflect the corner frequency of the cell. The filtering properties of avian lagena hair cells are like those found in all other vestibular end organs, suggesting that the electrical membrane properties of these cells are not responsible for specializing them to a particular stimulus modality.

perforated patch; vestibular end organs; potassium channels; membrane filter; inactivation


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