Mechanosensory hair cells express two molecularly distinct mechanotransduction channels

Zizhen Wu, Nicolas Grillet, Bo Zhao, Christopher Cunningham, Sarah Harkins-Perry, Bertrand Coste, Sanjeev Ranade, Navid Zebarjadi, Maryline Beurg, Robert Fettiplace, Ardem Patapoutian, Ulrich Müller

Research output: Contribution to journalArticlepeer-review

Abstract

Auditory hair cells contain mechanotransduction channels that rapidly open in response to sound-induced vibrations. We report here that auditory hair cells contain two molecularly distinct mechanotransduction channels. One ion channel is activated by sound and is responsible for sensory transduction. This sensory transduction channel is expressed in hair cell stereocilia, and previous studies show that its activity is affected by mutations in the genes encoding the transmembrane proteins TMHS, TMIE, TMC1 and TMC2. We show here that the second ion channel is expressed at the apical surface of hair cells and that it contains the Piezo2 protein. The activity of the Piezo2-dependent channel is controlled by the intracellular Ca 2+ concentration and can be recorded following disruption of the sensory transduction machinery or more generally by disruption of the sensory epithelium. We thus conclude that hair cells express two molecularly and functionally distinct mechanotransduction channels with different subcellular distributions.

Original languageEnglish (US)
Pages (from-to)24-33
Number of pages10
JournalNature neuroscience
Volume20
Issue number1
DOIs
StatePublished - Jan 1 2017

ASJC Scopus subject areas

  • Neuroscience(all)

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