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• W2077882371 startingPage "9508" @default.
• W2077882371 abstract "The encoding of auditory information with indefatigable precision requires efficient resupply of vesicles at inner hair cell (IHC) ribbon synapses. Otoferlin, a transmembrane protein responsible for deafness in DFNB9 families, has been postulated to act as a calcium sensor for exocytosis as well as to be involved in rapid vesicle replenishment of IHCs. However, the molecular basis of vesicle recycling in IHCs is largely unknown. In the present study, we used high-resolution liquid chromatography coupled with mass spectrometry to copurify otoferlin interaction partners in the mammalian cochlea. We identified multiple subunits of the adaptor protein complex AP-2 (CLAP), an essential component of clathrin-mediated endocytosis, as binding partners of otoferlin in rats and mice. The interaction between otoferlin and AP-2 was confirmed by coimmunoprecipitation. We also found that AP-2 interacts with myosin VI, another otoferlin binding partner important for clathrin-mediated endocytosis (CME). The expression of AP-2 in IHCs was verified by reverse transcription PCR. Confocal microscopy experiments revealed that the expression of AP-2 and its colocalization with otoferlin is confined to mature IHCs. When CME was inhibited by blocking dynamin action, real-time changes in membrane capacitance showed impaired synaptic vesicle replenishment in mature but not immature IHCs. We suggest that an otoferlin-AP-2 interaction drives Ca(2+)- and stimulus-dependent compensating CME in mature IHCs." @default.
• W2077882371 created "2016-06-24" @default.
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• W2077882371 date "2013-05-29" @default.
• W2077882371 modified "2023-10-01" @default.
• W2077882371 title "Otoferlin Couples to Clathrin-Mediated Endocytosis in Mature Cochlear Inner Hair Cells" @default.
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• W2077882371 doi "https://doi.org/10.1523/jneurosci.5689-12.2013" @default.
• W2077882371 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3676539" @default.
• W2077882371 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/23719817" @default.
• W2077882371 hasPublicationYear "2013" @default.
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