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- W2023003790 abstract "Hair cell death caused by acute acoustic trauma (AAT) reaches a secondary maximum at 7-10 days after noise exposure due to a second oxidative stress. Therefore, this study tested the effects of a combination of hydroxylated alpha-phenyl-tert-butylnitrone (4-OHPBN), N-acetyl-L-cysteine (NAC) and acetyl-L-carnitine (ALCAR) on AAT when the duration of treatment was extended over the period of 7-10 days after noise exposure as well as when the initial treatment was delayed 24 to 48 h after noise exposure.Thirty chinchilla were exposed to a 105 dB octave-band noise centred at 4 kHz for 6 h and received the following treatments: (1) noise + saline (2-5) 4-OHPBN (20 mg/kg) + NAC (50 mg/kg) + ALCAR (20 mg/kg) intraperitoneally injected beginning 24 or 48 h after noise exposure twice daily for the next 2, 8 or 9 days. Auditory brainstem response (ABR) threshold shifts, outer hair cell (OHC) counts and organ of Corti immunohistochemistry were analyzed.The combination administration decreased ABR threshold shifts, inhibited OHC loss and reduced 4-hydroxynonenal (4-HNE) immunostaining. Significant decreases in the threshold shifts and reduction in OHC loss were observed with a shorter delay before starting treatment (24 h) and longer duration (9 days) treatment.These results demonstrate that the administration of antioxidant drugs extended up to 10 days after noise exposure can effectively treat AAT in a chinchilla model. This may provide significant and potentially clinically important information about the effective therapeutic window for AAT treatment." @default.
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- W2023003790 date "2011-08-10" @default.
- W2023003790 modified "2023-10-06" @default.
- W2023003790 title "Effects of delayed and extended antioxidant treatment on acute acoustic trauma" @default.
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- W2023003790 doi "https://doi.org/10.3109/10715762.2011.605360" @default.
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