噪聲對大鼠耳蝸基底膜AIF表達(dá)的影響
[Abstract]:Experiment 1: establish an animal model of noise-induced hearing impairment objective to observe the effects of noise on auditory brainstem response (auditorybrainstem response,) in rats by establishing an animal model of noise-induced hearing impairment. ABR) threshold and the morphological changes of outer hair cells in different frequency regions of the cochlear basement membrane. Methods 40 SD rats were randomly divided into normal control group and noise exposure group. The noise exposure group was exposed to 115dBSPL white noise for 2 hours a day for 3 days. The control group was not exposed to noise. ABR was detected on the 1st day before noise exposure, 1 day after exposure and 14 days after exposure, and the cochlea basement membrane of the two groups was stained with Phalloidin-FITC after the last ABR detection. Results compared with before and after noise exposure, the threshold of ABR frequency response reached the highest level on the first day after exposure, and gradually recovered with the passage of time, and tended to stabilize at 14 days, and the low frequency threshold of hearing shifted about 10 dB. High frequency threshold shifted to 30dB (P0.05); FITC staining showed that the basal membrane hair cells in the noise exposed group were more serious than those in the apical gyrus, and the cilia were disordered and fused, while in the control group, the hair cells were arranged neatly, and the cilia were V or W type. There was significant difference in the number of outer hair cells between the two groups (P0.05). Conclusion in the process of noise-induced hearing loss, there is a temporary threshold shift in the early stage of hearing loss, which tends to stabilize at about 14 days, and a permanent threshold shift occurs. The results of ABR showed that the redox reaction was the most intense one day after noise exposure and the oxidation damage in the high frequency region of the basal membrane of cochlea was more serious than that in the low frequency region and it was not easy to recover. Effects of noise on the expression of AIF in the basement membrane of rat cochlea at different frequencies 1 objective to investigate the expression of apoptosis-inducing factor (AIF) in rat hair cells with different return basal membranes before and after noise exposure. The relationship between high frequency hearing loss and noise deafness. Methods 40 SD rats were randomly divided into normal control group and noise exposure group. The noise exposure group was exposed to 115dBSPL white noise for 2 hours a day for 3 days. The control group was not exposed to noise, and the other conditions were the same as those in the noise exposure group. The next day after noise exposure, the basal membrane of cochlea was taken and prepared. The expression of AIF in different basal membrane of cochlea was observed qualitatively and quantitatively by RT-qPCR,Western blot and immunofluorescence staining. Results Immunofluorescence staining showed that AIF was expressed in the cytoplasm of basal membrane hair cells in the top and bottom gyrus, but not in the nucleus in the normal group, and AIF was at the top in the noise exposure group. The fluorescence intensity of basal membrane hair cells in the basal gyrus was stronger than that in the control group, and a small amount of AIF expression could be found in the nucleus. The results of RT-qPCR and Western blot showed that the expression of AIF in basal membrane of parietal gyrus was higher than that in basal gyrus under normal condition. After noise exposure, the expression of AIF in basal membrane of AIF top and bottom gyrus was higher than that in control group. The parietal gyrus was more significant than the bottom gyrus (P0.05). Conclusion under normal conditions, the expression of AIF in different basal membrane hair cells of cochlea is significantly different, but after noise exposure, the expression of AIF in different frequency regions of cochlea is significantly increased. In this process, the redox enzyme was mainly played, and the apoptosis-inducing activity was secondary, which indicated that the ability of the basement membrane to resist the redox reaction was significantly different in different regions of cochlea. This may be one of the molecular mechanisms of high frequency hearing vulnerability in noise deafness.
【學(xué)位授予單位】:第四軍醫(yī)大學(xué)
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2013
【分類號】:R764.433
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