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- W2091294276 abstract "Abstract Sound is an important part of man's contact with the environment and has served as critical means for survival throughout his evolution. As a result of exposure to noise, physiological functions such as those involving structures of the auditory and non‐auditory systems might be damaged. We have previously reported that noise‐exposed developing rats elicited hippocampal‐related histological, biochemical and behavioral changes. However, no data about the time lapse of these changes were reported. Moreover, measurements of auditory pathway function were not performed in exposed animals. Therefore, with the present work, we aim to test the onset and the persistence of the different extra‐auditory abnormalities observed in noise‐exposed rats and to evaluate auditory pathway integrity. Male Wistar rats of 15 days were exposed to moderate noise levels (95–97 dB SPL, 2 h a day) during one day (acute noise exposure, ANE) or during 15 days (sub‐acute noise exposure, SANE). Hippocampal biochemical determinations as well as short (ST) and long term (LT) behavioral assessments were performed. In addition, histological and functional evaluations of the auditory pathway were carried out in exposed animals. Our results show that hippocampal‐related behavioral and biochemical changes (impairments in habituation, recognition and associative memories as well as distortion of anxiety‐related behavior, decreases in reactive oxygen species (ROS) levels and increases in antioxidant enzymes activities) induced by noise exposure were almost completely restored by PND 90. In addition, auditory evaluation shows that increased cochlear thresholds observed in exposed rats were re‐established at PND 90, although with a remarkable supra‐threshold amplitude reduction. These data suggest that noise‐induced hippocampal and auditory‐related alterations are mostly transient and that the effects of noise on the hippocampus might be, at least in part, mediated by the damage on the auditory pathway. However, we cannot exclude that a different mechanism might be responsible for the observed hippocampal‐related changes." @default.
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- W2091294276 date "2014-06-06" @default.
- W2091294276 modified "2023-10-06" @default.
- W2091294276 title "Long‐term recovery from hippocampal‐related behavioral and biochemical abnormalities induced by noise exposure during brain development. Evaluation of auditory pathway integrity" @default.
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- W2091294276 doi "https://doi.org/10.1016/j.ijdevneu.2014.06.002" @default.
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