益气活血方对脑缺血再灌注损伤模型大鼠脑组织细胞自噬及PI3K/Akt/mTOR信号通路的影响  

Effects of Yiqi-Huoxue formula on autophagy and PI3K/Akt/mTOR signaling pathway in rats with cerebral ischemia-reperfusion injury

作　　者：张田田 王瑾茜 毛果 商燕 李丽 何飘 张婷[3] 欧梁 胡国恒[3] ZHANG Tiantian;WANG Jinxi;MAO Guo;SHANG Yan;LI Li;HE Piao;ZHANG Ting;OU Liang;HU Guoheng(The Affiliated Hospital of Hunan Academy of Traditional Chinese Medicine,Changsha 410006,China;Hunan Academy of Chinese Medicine,Changsha 410013,China;The First Hospital of Hunan University of Chinese Medicine,Changsha 410007,China)

机构地区：[1]湖南省中医药研究院附属医院,湖南长沙410006 [2]湖南省中医药研究院,湖南长沙410013 [3]湖南中医药大学第一附属医院,湖南长沙410007

出　　处：《中国病理生理杂志》2024年第11期1993-2004,共12页Chinese Journal of Pathophysiology

基　　金：国家自然科学基金资助项目(No.81573941);国家中医药管理局“胡国恒全国名老中医药专家传承工作室”建设项目(国中医药函人教函〔2022〕75号);中国博士后基金资助项目(No.2023M731070);湖南省自然科学基金资助项目(No.2023JJ60118);湖南省教育厅科研项目(No.21C0255);长沙市自然科学基金资助项目(No.k92403132)。

摘　　要：目的:探究益气活血方(YQHXF)抗脑缺血再灌注损伤的可能作用机制。方法:雄性SD大鼠随机分为假手术组、模型组、YQHXF低、中、高剂量组、尼莫地平组。除假手术组外,其余各组大鼠建立大脑中动脉阻断/再灌注(MCAO/R)模型,造模成功后YQHXF低、中、高剂量组大鼠分别予以YQHXF 3.8、7.5、15 g∙kg^(-1)∙d^(-1)灌胃,尼莫地平组予以尼莫地平片12 mg∙kg^(-1)∙d^(-1)灌胃,假手术组和模型组予以蒸馏水10 mL∙kg^(-1)∙d^(-1)灌胃。药物干预14 d后,行大鼠神经功能评分;2,3,5-氯化三苯基四氮唑(TTC)染色测定脑梗死体积;苏木素-伊红(HE)染色观察脑组织病理学改变;透射电镜下观察各组自噬体变化;免疫荧光法检测脑皮层微管相关蛋白轻链3B(LC3B)蛋白表达;Western blot法检测缺血侧脑组织p-PI3K、PI3K、p-Akt、Akt、p-mTOR、mTOR、LC3B、P62、beclin-1及Atg5蛋白表达;RT-qPCR法检测缺血侧脑LC3、P62 mRNA表达情况。结果:与假手术组比较,模型组大鼠神经功能评分显著增高,TTC染色可见大片白色脑梗死区域,缺血侧皮层区脑组织病理损伤严重,细胞内可见大量自噬体形成,免疫荧光染色后可见大量LC3B阳性表达细胞(P<0.01),beclin-1、Atg5与LC3-II/LC3-I蛋白表达水平明显上调(P<0.01),P62蛋白表达水平明显下调(P<0.01),p-PI3K/PI3K、p-Akt/Akt和p-mTOR/mTOR蛋白比值亦显著降低(P<0.01);LC3 mRNA表达显著上调(P<0.01),P62 mRNA表达显著下调(P<0.01)。与模型组比较,YQHXF中、高剂量组在再灌注12 h后,LC3-II/LC3-I值上调(P<0.01),而在再灌注3 d、7 d、14 d后,LC3-II/LC3-I值(P<0.05)下调。此外,在再灌注14 d时,与模型组比较,YQHXF中、高剂量和尼莫地平灌胃治疗能够不同程度降低神经功能评分(P<0.01),缩小脑梗死体积(P<0.01),改善脑皮层区组织病理损害,减少自噬体形成,降低LC3B免疫荧光阳性细胞率(P<0.01),下调beclin-1、Atg5与LC3-II/LC3-I值与LC3 mRNA水平,上调P62蛋白表达及p62 mAIM:To explore the possible mechanism of Yiqi-Huoxue formula(YQHXF)in treating cerebral ischemia-reperfusion injury.METHODS:Male SD rats were randomly divided into six groups,namely,the sham,mod-el,nimodipine,and low-,middle-and high-dose YQHXF groups.The middle cerebral artery occlusion/reperfusion(MCAO/R)model was established in all groups except the sham group.After successful modeling,the YQHXF low-,me-dium-,and high-dose groups were given 3.8,7.5,and 15 g∙kg^(-1)∙d^(-1) of YQHXF,respectively,by gavage,while the ni-modipine group was given 12 mg∙kg^(-1)∙d^(-1) of nimodipine tablets by gavage.The sham and model groups were given 10 mL∙kg^(-1)∙d^(-1) of distilled water by gavage.After 14 days of drug intervention,the rats were euthanized and the neurological func-tion was evaluated.The infarct volume was assessed using 2,3,5-triphenyltetrazolium chloride(TTC)staining and brain histopathological changes were determined by hematoxylin-eosin(HE)staining.Transmission electron microscopy was used to investigate changes in autophagosomes,with immunofluorescence used to assess expression of microtubule-associ-ated protein 1 light chain 3(LC3)protein in the cerebral cortex,Western blot was used to measure protein levels of p-PI3K,PI3K,p-Akt,Akt,p-mTOR,mTOR,LC3B,p62,beclin-1,and Atg5,and RT-qPCR was used to determined LC3 and P62 mRNA expression.RESULTS:Compared with the sham group,the neural function scores of rats in the model group rats were significantly increased,and TTC staining revealed large areas of white cerebral infarction.There was severe pathological damage to the cerebral tissue in the ischemic cortical area,and large numbers of autophagosomes were seen inside the cells.Immunofluorescence staining showed significant numbers of LC3B-positive cells(P<0.01).Protein expression of beclin-1,Atg5,and LC3-II/LC3-I was significantly upregulated(P<0.01),while that of p62 was markedly downregulated(P<0.01).The expression of p-PI3K/PI3K,p-Akt/Akt,and p-mTOR/mTOR proteins was also significantly reduced(P<0.

关 键 词：益气活血方 脑缺血再灌注损伤 PI3K/Akt/mTOR信号通路 自噬 

分 类 号：R289.5[医药卫生—方剂学] R743.3[医药卫生—中药学] R363[医药卫生—中医学]