運動與芳香酶抑制劑誘發(fā)的記憶損傷關系研究
[Abstract]:Objective: aromatase inhibitors are widely used in the treatment of breast cancer. However, the inhibition of estrogen by aromatase inhibitors leads to the loss of estrogen in the brain of breast cancer patients, which leads to cognitive impairment in patients with breast cancer. The effect of exercise on the improvement of cognitive function has been widely recognized. At the same time, animal studies have confirmed that exercise can repair cognitive damage in ovariectomized rats. However, the effects of exercise on cognitive impairment induced by aromatase inhibitors are rarely reported. The purpose of this study was to establish an animal model of cognitive impairment induced by aromatase inhibitors and to explore the effects of moderate aerobic exercise on cognitive impairment induced by aromatase inhibitors. Methods: the model of mouse menopause was established by ovariectomy. The 3-month-old female C57BL/6 mice were randomly divided into five groups: (1) ovariectomized excipient group (OVX VEH SED); (_ 2) ovariectomized aromatase inhibitor injection quiet group (OVX LET SED); (_ 3) sham-operated excipient group (SHAM VEH SED); (_ 4) ovariectomy Excipient exercise group (OVX VEH EX); (5) Ovariectomized aromatase inhibitor injection exercise group (OVX LET EX). Two weeks after ovariectomy, mice in the aromatase inhibitor injection group were injected intraperitoneally with letrozole (80 渭 g/kg) for 4 weeks to establish a cognitive impairment model. At the same time, the mice in the exercise group were treated with moderate intensity passive treadmill exercise for 4 weeks (10 m / min / min 1 h / day). Then Y maze and Morris water maze were used to detect working memory and spatial navigation memory. 24 hours after the behavioral test, the mice were anesthetized and killed, blood and brain tissue were taken. Finally, the levels of serum estrogen in mice were detected by enzyme immunoassay (EIA) and the expression of brain-derived nerve growth factor (BDNF), transcription factor CREB and p-CREB in prefrontal cortex and hippocampus were detected by Western Blot. The results showed that: (1) compared with SHAM VEH SED group, serum estrogen content in OVX VEH SED group decreased significantly (p0.05); (2) in working memory test. The working memory of (OVX LET SED and OVX LET EX) mice in the aromatase inhibitor injection group was not significantly different from that of the (OVX VEH SED and OVX VEH EX) mice in the excipient injection group (p0.05); (3) at the stage of water maze acquired training. The spatial learning ability of (OVX LET SED and OVX LET EX) mice in the aromatase inhibitor injection group was not significantly different from that of the (OVX VEH SED and OVX VEH EX) mice in the excipient injection group (p0.05); (4). The exploration time in the target quadrant of (OVX LET SED and OVX LET EX) mice in the aromatase inhibitor injection group was significantly lower than the platform quadrant shuttle times in the (OVX VEH SED and OVX VEH EX); aromatase inhibitor injected quiet (OVX LET SED) mice in the excipient injection group. The expression of BDNF and the level of p-CREB/CREB in hippocampus of (OVX LET SED and OVX LET EX) mice in the aromatase inhibitor injection group were significantly lower than those in the excipient control group (OVX VEH SED and OVX VEH EX) (p0.05). There was no significant difference in protein level in prefrontal lobe (p0.05). Exercise had no significant effect on the expression of these proteins (p0.05). Conclusion: (1) aromatase inhibitors have brain region specificity for cognitive impairment: aromatase inhibitors have no significant effect on prefrontal lobe dependent memory in mice. (2) the damage of aromatase inhibitor to hippocampal associated memory function was related to the expression of BDNF and the decrease of CREB phosphorylation level in hippocampus. (3) 4 weeks of moderate treadmill exercise failed. To improve the impairment of learning and memory induced by aromatase inhibitor in mice.
【學位授予單位】:上海體育學院
【學位級別】:碩士
【學位授予年份】:2016
【分類號】:B842.3
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