Effect of capsaicin on potassium conductance and electromotility of the guinea pig outer hair cell

T. Wu, L. Song, X. Shi, Z. Jiang, J. Santos-Sacchi, A. L. Nuttall

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Capsaicin, the classic activator of TRPV-1 channels in primary sensory neurons, evokes nociception. Interestingly, auditory reception is also modulated by this chemical, possibly by direct actions on outer hair cells (OHCs). Surprisingly, we find two novel actions of capsaicin unrelated to TRPV-1 channels, which likely contribute to its auditory effects in vivo. First, capsaicin is a potent blocker of OHC K conductances (IK and IK,n). Second, capsaicin substantially alters OHC nonlinear capacitance, the signature of electromotility - a basis of cochlear amplification. These new findings of capsaicin have ramifications for our understanding of the pharmacological properties of OHC IK, IK,n and electromotility and for interpretation of capsaicin pharmacological actions.

Original languageEnglish (US)
Pages (from-to)117-124
Number of pages8
JournalHearing Research
Volume272
Issue number1-2
DOIs
StatePublished - Feb 2011

ASJC Scopus subject areas

  • Sensory Systems

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