穹窿海马伞切断大鼠不同脑区酪氨酸激酶A表达的变化

背景胆碱能神经系统存在胆碱与神经生长因子受体酪氨酸激酶A共同作用的位点,胆碱能损伤是否影响到酪氨酸激酶A的变化,对于能否应用神经生长因子干预认知障碍疾病具有重要意义.目的观察双侧穹窿海马伞切断大鼠脑内不同部位酪氨酸激酶A表达的变化,了解穹窿海马伞切断对神经生长因子受体系统的影响.设计以动物为观察对象,完全随机对照实验.单位青岛大学医学院附属医院脑血管病研究所.材料实验于2003-03/12在青岛大学医学院附属医院脑血管病研究所完成.14只雌性Wistar大鼠随机分为对照组、模型组两组,每组7只.方法模型组大鼠行双侧穹窿海马伞切断,对照组同样手术,但不切断穹窿海马伞.两组大鼠术后观察28 d后麻醉状态下处死,取脑,行免疫组化染色.主要观察指标两组大鼠脑海马CA1区、皮质区、杏仁复合体区、基底前脑Meynert核区酪氨酸激酶A阳性细胞数量.结果14只大鼠全部进入结果分析.模型组大鼠大脑皮质区、脑海马CA1区、杏仁复合体区、Meynert核区酪氨酸激酶A阳性细胞数显著少于对照组[(18.91±6.27),(15.17±5.23),(18.71±9.05),(8.03±2.33)个;(54.77±11.84),(59.69±10.40),(49.23±15.84),(21.49±15.54)个,t=4.17～10.00;P＜0.01].结论穹窿海马伞切断大鼠脑内多部位酪氨酸激酶A表达减少,这种病理变化可能是认知障碍和老年性痴呆的原因之一.

Expression variety of tyrosine kinase A in different cerebral regions of rats with fimbria/fornix transection

BACKGROUND: Cholinergic nervous system has a site which is affected by both blineurine and nerve growth factor receptor tyrosine kinase A (NGF-RTK-A). Whether cholinergic injury can affect the changes of tyrosine kinase A (TrKA) is significant to the application of nerve growth factor (NGF) to interfere cognitive disorder disease.OBJECTIVE: To observe the expressive variety of TrKA in different cerebral regions of rats with bilateral fimbria/fornix transection, and comprehend the effect of fimbria/fornix transection on nerve growth factor receptor system.DESIGN: A completely randomized and controlled study on the basis of animals.SETTING: Institute of Cerebrovascular Disease, Affiliated Hospital of Qingdao University Medical College.MATERIALS: The experiment was completed in the Institute of Cerebrovascular Disease, Affiliated Hospital of Qingdao University Medical College from March to December 2003. Totally 14 male Wistar rats were randomly divided into control group and model group with 7 in each group.METHODS: The bilateral fimbria/fornix transection was performed on rats in the model group, but rats in the control group were treated with the same methods except fimbria/fornix transection. Twenty eight days after operation, rats in the two groups were killed under anesthesia to take out brain tissues to stain with immunohistochemical staining.MAIN OUTCOME MEASURES: The number of positive TrKA cells in the hippocammpal CA1, cortex, amygdala and Meynert of the basal forebrain of rats in both groups.RESULTS: Totally 14 rats entered the final analysis. The numbers of positive TrKA cells in the hippocammpal CA1, cortex, amygdala and Meynert of the basal forebrain of rats in the model group were obviously smaller than those in the control group [(18.91 ±6.27), (15.17±5.23),(18.71±9.05), (8.03±2.33); (54.77±11.84), (59.69±10.40), (49.23±15.84),(21.49±15.54), t=4.17-10.00; P ＜ 0.01].CONCLUSION: The expression of TrkA positive neurons is decreased in many sections of the brain in the rats with fimbria/fornix transection.Possibly it is the cause leading to the cognitive disorder and senile dementia.