Abstract
In the inner ear, there is considerable evidence that extracellular adenosine 5′-triphosphate (ATP) plays an important role in auditory neurotransmission as a neurotransmitter or a neuromodulator, although the potential role of adenosine signalling in the modulation of auditory neurotransmission has also been reported. The activation of ligand-gated ionotropic P2X receptors and G protein-coupled metabotropic P2Y receptors has been reported to induce an increase of intracellular Ca2+ concentration ([Ca2+]i) in inner hair cells (IHCs), outer hair cells (OHCs), spiral ganglion neurons (SGNs), and supporting cells in the cochlea. ATP may participate in auditory neurotransmission by modulating [Ca2+]i in the cochlear cells. Recent studies showed that extracellular ATP induced nitric oxide (NO) production in IHCs, OHCs, and SGNs, which affects the ATP-induced Ca2+ response via the NO-cGMP-PKG pathway in those cells by a feedback mechanism. A cross-talk between NO and ATP may therefore exist in the auditory signal transduction. In the present article, I review the role of NO on the ATP-induced Ca2+ signalling in IHCs and OHCs. I also consider the possible role of NO in the ATP-induced Ca2+ signalling in SGNs and supporting cells.
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Harada, N. Role of nitric oxide on purinergic signalling in the cochlea. Purinergic Signalling 6, 211–220 (2010). https://doi.org/10.1007/s11302-010-9186-7
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DOI: https://doi.org/10.1007/s11302-010-9186-7