朱波,杨艳,苏仁意,许细平,孙乾朕

• 1:湖北医药学院附属襄阳市第一人民医院

摘要(Abstract)：

目的观察丹参酮ⅡA注射液对缺血缺氧性脑损伤新生大鼠皮质神经元自噬及Akt-mTOR通路影响并探讨其机制。方法 7日龄SD新生大鼠80只,随机平均分为5组,分别为假手术组、模型组及经丹参酮ⅡA处理的高剂量组(0.1 mg/g)、中剂量组(0.05 mg/g)、低剂量组(0.02 mg/g)。Rice法造模,透射电镜观察新生大鼠大脑皮质神经元变化情况,TTC染色检测脑梗死情况,蛋白免疫印迹检测脑组织LC3-Ⅰ、LC3-Ⅱ、Beclin-1、p-Akt、p-mTOR、p-S6蛋白表达情况。结果假手术组神经元结构正常,模型组中观察到皮质神经元中存在大量的自噬体和自噬溶酶体,其中泡状自噬体中包裹有可见的细胞质结构。相较于模型组,高剂量组、中剂量组、低剂量组中自噬体数量明显减少,且呈一定的剂量依赖性(P <0.05)。与假手术组相比,模型组中幼鼠脑梗死面积显著增加(P <0.05)。与模型组相比,高剂量组、中剂量组、低剂量组中脑梗死面积显著减小,且呈一定的剂量依赖性(P <0.05)。与假手术组相比,模型组中LC3-Ⅰ/(LC3-Ⅰ+LC3-Ⅱ)的比值与Beclin-1蛋白表达水平显著增高(P <0.05)。与模型组相比,高剂量组、中剂量组、低剂量组中LC3-Ⅰ/(LC3-Ⅰ+LC3-Ⅱ)的比值与Beclin-1蛋白表达水平显著降低,且呈剂量依赖性(P <0.05)。与假手术组相比,模型组中pAkt、p-mTOR、p-S6蛋白表达水平均显著降低(P <0.05)。与模型组相比,高剂量组、中剂量组、低剂量组中pAkt、p-mTOR、p-S6蛋白表达水平均显著增加,且呈剂量依赖性(P <0.05)。结论丹参酮ⅡA对新生大鼠缺血缺氧性脑损伤大脑皮质神经元自噬具有显著的抑制作用,推测其机制可能为通过激活Akt-mTOR信号转导通路实现的。

关键词(KeyWords)： 缺血缺氧性脑损伤;丹参酮ⅡA;皮质神经元;自噬;Akt-mTOR通路

Abstract:

Keywords:

基金项目(Foundation): 湖北省自然科学基金项目(2015CKB139)

作者(Author): 朱波,杨艳,苏仁意,许细平,孙乾朕

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