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Related Experiment Videos

Intracellular calcium and outer hair cell electromotility.

M Szönyi1, D Z He, O Ribári

  • 1Auditory Physiology Laboratory, Departments of Communication Sciences and Disorders, Frances Searle Building, Northwestern University, 2299 North Campus Drive, Evanston, IL 60208, USA.

Brain Research
|December 4, 2001
PubMed
Summary
This summary is machine-generated.

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Increased intracellular calcium enhances outer hair cell (OHC) electromotility, a process dependent on calcium and calmodulin. This finding is crucial for understanding OHC function and hearing.

Area of Science:

  • Otoacoustic emissions
  • Cellular physiology
  • Biophysics

Background:

  • Outer hair cells (OHCs) are crucial for hearing.
  • OHC electromotility is a key mechanism for cochlear amplification.

Purpose of the Study:

  • To investigate the influence of intracellular calcium levels on OHC electromotility.
  • To determine the role of calcium and calmodulin in OHC electromotility.

Main Methods:

  • Transcellular electrical stimulation in a partitioning microchamber.
  • Measurement of OHC electromotile activity before and after ionomycin application.
  • Assessment of the effect of W7 (calmodulin antagonist) on ionomycin-induced changes.

Main Results:

Related Experiment Videos

  • Ionomycin increased OHC electromotility, indicating a role for calcium.
  • Dimethyl sulfoxide (DMSO), the ionomycin solvent, initially decreased electromotility.
  • The DMSO-induced decrease was counteracted and reversed by ionomycin.
  • W7 attenuated the ionomycin-induced increase, suggesting partial calmodulin mediation.

    • Conclusions:

    • Increased intracellular calcium enhances OHC electromotility.
    • The calcium-induced increase in OHC electromotility is partially dependent on calmodulin.
    • These findings elucidate the molecular mechanisms underlying OHC function.