Macromolecular and electrical coupling between inner hair cells in the rodent cochlea
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.
Medienart: |
E-Artikel |
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Erscheinungsjahr: |
2020 |
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Erschienen: |
2020 |
Enthalten in: |
Zur Gesamtaufnahme - volume:11 |
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Enthalten in: |
Nature communications - 11(2020), 1 vom: 25. Juni, Seite 3208 |
Sprache: |
Englisch |
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Beteiligte Personen: |
Jean, Philippe [VerfasserIn] |
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Anmerkungen: |
Date Completed 28.08.2020 Date Revised 25.06.2021 published: Electronic Citation Status MEDLINE |
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doi: |
10.1038/s41467-020-17003-z |
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funding: |
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Förderinstitution / Projekttitel: |
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PPN (Katalog-ID): |
NLM311655351 |
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520 | |a 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 | ||
650 | 4 | |a Journal Article | |
650 | 4 | |a Research Support, Non-U.S. Gov't | |
700 | 1 | |a Anttonen, Tommi |e verfasserin |4 aut | |
700 | 1 | |a Michanski, Susann |e verfasserin |4 aut | |
700 | 1 | |a de Diego, Antonio M G |e verfasserin |4 aut | |
700 | 1 | |a Steyer, Anna M |e verfasserin |4 aut | |
700 | 1 | |a Neef, Andreas |e verfasserin |4 aut | |
700 | 1 | |a Oestreicher, David |e verfasserin |4 aut | |
700 | 1 | |a Kroll, Jana |e verfasserin |4 aut | |
700 | 1 | |a Nardis, Christos |e verfasserin |4 aut | |
700 | 1 | |a Pangršič, Tina |e verfasserin |4 aut | |
700 | 1 | |a Möbius, Wiebke |e verfasserin |4 aut | |
700 | 1 | |a Ashmore, Jonathan |e verfasserin |4 aut | |
700 | 1 | |a Wichmann, Carolin |e verfasserin |4 aut | |
700 | 1 | |a Moser, Tobias |e verfasserin |4 aut | |
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