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- W2017993652 abstract "In the cochlea, afferent transmission between inner hair cells and auditory neurons is mediated by glutamate receptors. Glutamate transporters located near the synapse and in spiral ganglion neurons are thought to maintain low synaptic levels of glutamate. We analyzed three glutamate transporter blockers for their ability to alter the effects of glutamate, exogenously applied to the synapse via perfusion of the scala tympani of the mouse, and compared that action to their ability to alter the effects of intense acoustic stimulation. Threo-beta-benzyloxyaspartate (TBOA) is a broad-spectrum glutamate transporter antagonist, affecting all three transporters [glutamate/aspartate transporter (GLAST), glutamate transporter-1 (GLT1), and excitatory amino acid carrier 1 (EAAC1)]. l-serine- O-sulfate (SOS) blocks both GLAST and EAAC1 without effect on GLT1. Dihydrokainate (DHK) is selective for GLT1. Infusion of glutamate (10 μM for 220 min), TBOA (200 μM for 220 min), or SOS (100 μM for 180 min) alone did not alter auditory neural thresholds. When infused together with glutamate, TBOA and SOS produced significant neural threshold shifts, leaving otoacoustic emissions intact. In addition, both TBOA and SOS exacerbated noise-induced hearing loss by producing larger neural threshold shifts and delaying recovery. DHK did not alter glutamate- or noise-induced hearing loss. The evidence points to a major role for GLAST, both in protecting the synapse from exposure to excess extracellular glutamate and in attenuating hearing loss due to acoustic overstimulation." @default.
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- W2017993652 date "2010-05-01" @default.
- W2017993652 modified "2023-09-25" @default.
- W2017993652 title "Functional Roles of High-Affinity Glutamate Transporters in Cochlear Afferent Synaptic Transmission in the Mouse" @default.
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- W2017993652 doi "https://doi.org/10.1152/jn.00018.2010" @default.
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