端粒縮短與P53激活在大鼠耳蝸老化中作用的研究
[Abstract]:Aim: to investigate the possible role of telomere dysfunction and activation of p53 pathway in cochlear aging in rats and to explore the possible pathogenesis of presbycusis. Methods: 72 1-month old SD rats with sensitive auricle reflex were randomly divided into two groups: normal saline control group, D- galactose group. D- galactose group received subcutaneous injection of 50g/L (500mg/Kg body weight) into the neck for 8 weeks. Saline control group received subcutaneous injection of the same volume of saline into the neck for 8 weeks. Each group was divided into three subgroups with 12 rats in each subgroup. The relative length of telomere and the expression of p53 gene mRNA were detected by real-time quantitative PCR. Western-blotting was used to detect the relative expression of p53 protein. Results: there was no significant difference in telomere relative length between Dgalactose group and normal saline control group at 3 months, 6 months and 9 months after administration. However, the relative length of telomere in the control group was shorter than that in the control group (P 0.05). The relative length of telomere was also shorter in the Dgalactose group than in the control group in 9 months after administration and 3 months after administration. The difference was statistically significant (P0.05). The expression of p53 in D- galactose group was higher than that in control group in 3 months and 6 months after administration. There was no significant difference in p53 expression between Dgalactose group and control group in 9 months after administration (P0.05), but the expression of p53 in saline group showed an increasing trend in 3 months, 6 months and 9 months after administration of normal saline, and there was no significant difference in p53 expression between Dgalactose group and control group (P0.05). The expression of p53 in Dgalactose group was also increased in 6 months, September and 3 months after administration (P0.05), and there was a significant difference in p53 expression between 9 months after administration and 3 months after administration (P0.05). Conclusion: telomere shortening may lead to dysfunction and activation of p53 gene during natural aging of inner ear tissue. The results suggest that telomere p53 pathway may be involved in the course of ARHL. D- galactose induced pseudo aging model of inner ear has no significant change in telomere relative length, but p53 is activated to a certain extent, and telomere shortening is related to the number of cell division. We believe that the changes in p53 expression may occur before telomere changes, and telomere shortening may take longer time to induce pseudoaging of the inner ear induced by D-galactose, which may affect p53 and its downstream signaling molecules in other ways. However, the continuous activation of p53 is limited, and there may be a plateau phase, which may be the result of the interaction between mitochondrial DNA mutation induced by D-galactose and p53 dependent cell repair.
【學(xué)位授予單位】:華中科技大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2013
【分類號(hào)】:R764.35
【共引文獻(xiàn)】
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