Abstract：
:Inner hair cells (IHCs) are the primary receptors for hearing. They are housed in the cochlea and convey sound information to the brain via synapses with the auditory nerve. IHCs have been thought to be electrically and metabolically independent from each other. We report that, upon developmental maturation, in mice 30% of the IHCs are electrochemically coupled in 'mini-syncytia'. This coupling permits transfer of fluorescently-labeled metabolites and macromolecular tracers. The membrane capacitance, Ca2+-current, and resting current increase with the number of dye-coupled IHCs. Dual voltage-clamp experiments substantiate low resistance electrical coupling. Pharmacology and tracer permeability rule out coupling by gap junctions and purinoceptors. 3D electron microscopy indicates instead that IHCs are coupled by membrane fusion sites. Consequently, depolarization of one IHC triggers presynaptic Ca2+-influx at active zones in the entire mini-syncytium. Based on our findings and modeling, we propose that IHC-mini-syncytia enhance sensitivity and reliability of cochlear sound encoding.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Jean P,Anttonen T,Michanski S,de Diego AMG,Steyer AM,Neef A,Oestreicher D,Kroll J,Nardis C,Pangršič T,Möbius W,Ashmore J,Wichmann C,Moser Tdoi
10.1038/s41467-020-17003-zsubject
Has Abstractpub_date
2020-06-25 00:00:00pages
3208issue
1issn
2041-1723pii
10.1038/s41467-020-17003-zjournal_volume
11pub_type
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