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- W2087982528 abstract "In order to delineate mechanisms of noise-induced hearing loss, we assessed noise trauma and its pharmacological modulation in the guinea pig. Auditory threshold shifts (measured by auditory brainstem responses), hair cell loss and lipid peroxidation (8-isoprostane formation) were determined in the absence or presence of agents known to influence the formation or action of reactive oxygen species (ROS): the non-specific N-methyl-D-aspartate (NMDA) receptor antagonist (+)-MK-801, its inactive isomer (-)-MK-801, the selective NR1/2B NMDA receptor antagonist PD 174494, the nitric oxide synthase (NOS) inhibitor L-N(omega)-Nitroarginine methyl ester (L-NAME) and the anti-oxidant N-acetylcysteine (NAC). (+)-MK-801 and NAC attenuated threshold shifts and hair cell loss effectively while PD 174494 did so partially. L-NAME attenuated threshold shifts at 2 kHz but increased them at 20 kHz, and (-)-MK-801 was ineffective. Noise-induced elevation in 8-isoprostane in the cochlea was significantly attenuated by (+)-MK-801 and PD 174494 in the organ of Corti and modiolar core, by L-NAME in the lateral wall and modiolar core, and by NAC in all three regions. (-)-MK-801 did not influence noise-induced 8-isoprostane formation. There was a significant correlation between threshold shifts at 4 kHz, hair cell loss and the level of 8-isoprostane formed in the organ of Corti, but not in the lateral wall tissues. This finding suggests a causal relationship between ROS formation and functional and morphological damage. NMDA receptors and, to some extent, NOS may be involved in noise-induced ROS formation. The data also indicate that lipid peroxidation in the lateral wall tissues does not influence permanent threshold shifts." @default.
- W2087982528 created "2016-06-24" @default.
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- W2087982528 date "2003-03-01" @default.
- W2087982528 modified "2023-10-10" @default.
- W2087982528 title "Protection from noise-induced lipid peroxidation and hair cell loss in the cochlea" @default.
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- W2087982528 doi "https://doi.org/10.1016/s0006-8993(02)04205-1" @default.
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