کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4356073 1615658 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Age-related hearing loss in the Fischer 344/NHsd rat substrain
موضوعات مرتبط
علوم زیستی و بیوفناوری علم عصب شناسی سیستم های حسی
پیش نمایش صفحه اول مقاله
Age-related hearing loss in the Fischer 344/NHsd rat substrain
چکیده انگلیسی

Studies of the F344 rat have shown a variety of age-related auditory anatomy and physiology changes. The current study was undertaken to clarify the ARHL in the F344 rat, by examining the auditory pathway of the F344/NHsd substrain that is distributed by Harlan Laboratories for research in the United States. The F344/NHsd rat begins to lose its hearing at about 12 months, and by 24 months, there are 50–60 dB auditory brainstem response threshold shifts at 20 and 40 kHz and 20 dB losses at 5–10 kHz. Distortion product otoacoustic emissions (DPOAE) amplitudes at 1.8–12 kHz stimuli were depressed in the older (18–24 months) rats. Amplitude input–output functions of the compound action potential (CAP) were also depressed across frequency. The endocochlear potential (EP) was 90–100 mV in the 3 month old rats. All but one of the 24 month old rats’ EPs were in the +75–85 mV range. Tympanometry revealed no differences in middle ear function between the young and older rats. Collectively, these findings suggest damage to the outer hair cells, but anatomical examination of the outer hair cells revealed a relative lack of cell loss compared to the magnitude of the hearing and DPOAE loss.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Hearing Research - Volume 241, Issues 1–2, July 2008, Pages 26–33
نویسندگان
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