Cochlear hair cell mechanotransduction (MET) channel complex

Cochlear mechanoreceptors refer to specialized hair cells in the cochlea that detect sound-induced vibrations via a complex mechanotransduction process.[5][1][2][3] These are not single protein targets, but rather sensory cells whose mechanosensitivity depends on a multi-protein complex, primarily the mechanically gated MET (mechanoelectrical transduction) ion channel complex in stereocilia. The MET channel likely includes or is regulated by several key proteins: transmembrane channel-like proteins TMC1/TMC2 (candidate pore-formers), LHFPL5 (TMHS), TMIE, cadherin 23 (CDH23), and protocadherin 15 (PCDH15), together with additional scaffold and regulatory elements such as harmonin, sans, and myosin VIIa[1][2]. Tip links formed by CDH23 and PCDH15 transmit mechanical force to open the MET channel when stereocilia bundles are deflected by sound, rapidly converting mechanical energy into an electrical signal (mechanoelectrical transduction)[1][2][3]. Dysfunction or mutation in any component can cause congenital deafness (e.g., Usher Syndrome, non-syndromic deafness)[2]. While aminoglycoside antibiotics like dihydrostreptomycin and gentamicin block these channels and cause hair cell death (ototoxicity), there are no approved drugs that positively target or modulate these receptors for therapy[2]. "Cochlear mechanoreceptors" does not refer to a single molecular entity, so this is not a canonical drug target and cannot be accurately mapped to a unique molecular structure or gene[1][2][3]. Key clarification: “Cochlear mechanoreceptors” is a broad anatomical/physiological term for a class of cells in the cochlea (hair cells containing a mechanotransduction complex), not a canonical molecule or validated drug target. The actual therapeutic targets are specific proteins (e.g., TMC1, PCDH15, CDH23, etc.) within the mechanotransduction apparatus[1][2].

Other names

cochlear hair cell mechanoreceptorcochlear hair cellsensory hair cellcochlear mechanotransduction channelmechanosensitive ion channel (hair cell)MET channel

Channel blockade (aminoglycosides block/inhibit the MET channel pore, causing hair cell toxicity and hearing loss)