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• W3006665155 endingPage "107913" @default.
• W3006665155 startingPage "107913" @default.
• W3006665155 abstract "The tectorial membrane (TM), a complex acellular structure that covers part of the organ of Corti and excites outer hair cells, is required for normal hearing. It consists of collagen fibrils and various glycoproteins, which are synthesized in embryonic and postnatal development by different cochlear cell types including the interdental cells (IDCs). At its modiolar side, the TM is fixed to the apical surfaces of IDCs, which form the covering epithelium of the spiral limbus. We performed confocal membrane imaging and Ca2+ imaging in IDCs of the developing mouse cochlea from birth to postnatal day 18 (P18). Using the fluorescent membrane markers FM 4–64 and CellMask™ Deep Red on explanted whole-mount cochlear epithelium, we identified the morphology of IDCs at different z-levels of the spiral limbus. Ca2+ imaging of Fluo-8 AM-loaded cochlear epithelia revealed spontaneous intracellular Ca2+ transients in IDCs at P0/1, P4/5, and P18. Their relative frequency was lowest on P0/1, increased by a factor of 12.5 on P4/5 and decreased to twice the initial value on P18. At all three ages, stimulation of IDCs with the trinucleotides ATP and UTP at 1 and 10 μM elicited Ca2+ transients of varying amplitude and shape. Before the onset of hearing, IDCs responded with robust Ca2+ oscillations. At P18, after the onset of hearing, ATP stimulation either caused Ca2+ oscillations or an initial Ca2+ peak followed by a plateau while the UTP response was unchanged from that at pre-hearing stage. Parameters of spontaneous and nucleotide-evoked Ca2+ transients such as amplitude, decay time and duration were markedly reduced during cochlear development, whereas the kinetics of the Ca2+ rise did not show relevant changes. Whether low-frequency spontaneous Ca2+ transients are necessary for the formation and maintenance of the tectorial membrane e.g. by regulating gene transcription needs to be elucidated in further studies." @default.
• W3006665155 created "2020-02-24" @default.
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• W3006665155 date "2020-04-01" @default.
• W3006665155 modified "2023-09-26" @default.
• W3006665155 title "Calcium signaling in interdental cells during the critical developmental period of the mouse cochlea" @default.
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• W3006665155 doi "https://doi.org/10.1016/j.heares.2020.107913" @default.
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