鸢尾苷元对血管紧张素Ⅱ作用下心肌成纤维细胞增殖和凋亡的影响

目的探讨鸢尾苷元对血管紧张素Ⅱ(AngⅡ)作用下心肌成纤维细胞增殖和凋亡的影响及其机制。方法采用差速贴壁法获得纯化的大鼠心肌成纤维细胞,采用MTT法和原位末端标记法检测鸢尾苷元或磷脂肌醇-3-激酶(PI3K)/蛋白激酶B(Akt)信号通路对AngⅡ作用下心肌成纤维细胞增殖和凋亡的影响,采用RT-PCR检测鸢尾苷元对AngⅡ作用下心肌成纤维细胞中凋亡相关基因Bcl-2、Bax mRNA表达的影响,Western blot法检测鸢尾苷元对AngⅡ作用下心肌成纤维细胞中凋亡相关蛋白Bcl-2、Bax和PI3K/Akt信号通路相关蛋白p-Akt、T-Akt表达的影响。结果 AngⅡ能明显促进心肌成纤维细胞增殖,抑制细胞凋亡;给予50,100和200μmol·L^-1鸢尾苷元后,AngⅡ使心肌成纤维细胞促增殖和抑凋亡作用明显受到抑制,且200μmol·L^-1鸢尾苷元作用最显著。200μmol·L^-1鸢尾苷元能够明显抑制AngⅡ诱导的Bcl-2 mRNA和p-Akt、Bcl-2蛋白的表达;减弱AngⅡ对Bcl-2 mRNA和蛋白表达的...     

Salidroside protects PC12 cells from MPP-induced apoptosis via activation of the PI3K/Akt pathway

Oxidative stress plays an important role in the pathogenesis of Parkinson’s disease (PD). Salidroside (SAL), a phenylpropanoid glycoside isolated from Rhodiola rosea L., can exert potent antioxidant properties. In this study, we investigated the protective effects, and the possible mechanism of action, of SAL against 1-methyl-4-phenylpyridinium (MPP⁺)-induced cell damage in rat adrenal pheochromocytoma PC12 cells. Pretreatment of PC12 cells with SAL significantly reduced the ability of MPP⁺ to induce apoptosis in a dose and time-dependent manner. SAL significantly and dose-dependently inhibited MPP⁺-induced chromatin condensation and MPP⁺-induced release of lactate dehydrogenase by PC12 cells. SAL enhanced Akt phosphorylation in PC12 cells, and the protective effects of SAL against MPP⁺-induced apoptosis were abolished by LY294002, a specific inhibitor of phosphatidylinositol 3-kinase (PI3K) phosphorylation. These findings suggest that SAL prevents MPP⁺-induced apoptosis in PC12 cells, at least in part through activation of the PI3K/Akt pathway.     

表食子儿茶素没食子酸酯对皮质酮损伤神经细胞的保护效应及其作用机制

目的：研究表没食子儿茶素没食子酸酯（EGCG）对皮质酮损伤神经细胞的作用及对细胞内PI3K/Akt信号的影响。方法：用MTT法检测细胞损伤程度,构建皮质酮（CORT）应激损伤细胞模型;倒置显微镜下观察细胞形态变化;Hochest染色观察细胞凋亡情况;免疫印迹方法检测细胞p-Akt、Akt蛋白表达变化。结果：与正常对照组相比,模型组细胞存活率明显降低,细胞形态改变,突触收缩,凋亡增加,Akt磷酸化降低;当给予EGCG后,细胞存活率提高,细胞形态有所恢复,细胞凋亡减少,Akt磷酸化水平升高;先给予PI3K/Akt阻断剂后,EGCG对细胞存活率的升高作用和对细胞形态的缓解作用均被抑制。结论：EGCG能缓解CORT对PC12细胞的损伤作用,而PI3K/Akt信号在EGCG神经保护效应中具有重要作用。     

保和消积方体外对胃癌细胞增殖和迁移的影响及其机制研究

目的：探讨保和消积方对胃癌SGC-7901细胞增殖和迁移的影响,在mRNA和蛋白水平上阐明其分子机制。方法：选取对数生长期的胃癌SGC7901细胞作为研究对象,分为空白对照组和不同浓度（0.5、1、2、4、8、12和16 mg/mL）组,采用噻唑蓝（MTT）法检测不同时间（24、48、72 h）SGC7901细胞增殖情况;采用Transwell小室迁移试验检测SGC7901细胞的迁移能力;利用流式细胞仪检测SGC7901细胞凋亡情况;定量PCR和蛋白质免疫印迹法分别检测胃癌SGC7901细胞增殖、迁移、血管生成相关的磷脂酰肌醇3-激酶（PI3K）、蛋白激酶B（AKT）、哺乳动物雷帕霉素靶蛋白（mTOR）、血管内皮生长因子（VEGF）mRNA和蛋白表达水平。结果：与空白对照组比较,作用不同时间后不同浓度的保和消积方组的胃癌SGC7901细胞增殖抑制率显著增加（均P<0.05）,穿膜细胞数显著降低（均P<0.05）,显著抑制了微管的形成（均P<0.05）,AKT、mTOR、PI3K、VEGF mRNA和蛋白表达水平显著降低（均P<0.05）。结论：保和消积方通过抑制AKT、mTOR、PI3K、VEGF的mRNA和蛋白表达,从而抑制了SGC7901胃癌细胞增殖、迁移,促进了胃癌细胞的凋亡。     

丹参素经PI3K/AKT信号通路改善血管性痴呆小鼠认知功能的机制研究

目的：基于磷脂酰肌醇-3-激酶（PI3K）/蛋白激酶B（AKT）信号通路探讨丹参素对血管性痴呆小鼠认知功能的改善情况。方法：将60只昆明种小鼠按随机数字表法分为6组：正常对照组、模型组、阳性对照组（尼莫地平注射液,2 mg·kg-1）、丹参素低（10 mg·kg -1）、中（20 mg·kg -1）、高（30 mg·kg -1）剂量组,每组10只。模型组、阳性对照组、丹参素低、中、高剂量组小鼠构建血管性痴呆模型。建模成功后,从第1天开始丹参素各剂量组和阳性对照组腹腔注射相应的药物,正常对照组和模型组腹腔注射等量生理盐水,每天1次,持续28d。给药结束后对小鼠进行水迷宫实验,检测小鼠脑损伤相关因子血清星形胶质源性蛋白（S-100β）、神经元特异性烯醇化酶（NSE）含量,苏木精-伊红（HE）染色观察小鼠脑组织结构,蛋白免疫印迹（Western blot）法检测小鼠脑组织中PI3K、AKT蛋白水平。结果：正常对照组小鼠脑组织结构正常,细胞排列整齐,无明显空泡结构;模型组可见明显的脑白质受损,细胞排列紊乱,视野中大量空泡结构;在给予丹参素干预后,随着丹参素给药剂量的增加,可见脑组织细胞排列逐渐变整齐,空泡结构逐渐减少。与正常对照组比较,模型组小鼠逃避潜伏期、血清S-100β、NSE含量显著升高,脑组织中PI3K、AKT蛋白表达水平显著降低（P<0.05）;与模型组比较,丹参素低、中、高剂量组和阳性对照组小鼠逃避潜伏期、血清S-100β、NSE含量显著降低,脑组织中PI3K、AKT蛋白表达水平显著升高（P<0.05）;随着丹参素给药剂量的增加,小鼠逃避潜伏期、血清S-100β、NSE含量逐渐降低,脑组织中PI3K、AKT蛋白表达水平逐渐升高,具有量-效关系（P<0.05）;丹参素高剂量组和阳性对照组上述指标差异无统计学意义（P＞0.05）。结论：丹参素可通过调节PI3K/AKT信号通路及相关细胞因子,改善血管性痴呆小鼠的认知功能障碍。     

Change of Pulsatility Index of the Fetal Middle Cerebral Artery after Auditory Stimulation in No Risk Pregnancies and in Pregnancies with Gestational Hypertension

Purpose: An aim was to determine the degree and the mode of variation of PI of middle cerebral artery in no risk pregnancies and in pregnancies with gestational hypertension, after the constant sound stimuli. Method: Study included 343 patients divided in two groups. Group 1: low risk pregnancies and group 2: gestational hypertension. Ultrasound prenatal auditory screening was performed after the 27th week of gestation. Results: The percentage of fetuses with increase of cerebral blood flow was slightly higher in the pregnancies with hypertension. Conclusion: An average change of PI of median cerebral artery was higher in this group.     

Mussel oligopeptides ameliorate cognition deficit and attenuate brain senescence in d-galactose-induced aging mice

Dietary supplementation exerts beneficial effects in reducing incidence of chronic neurodegenerative diseases. The purpose of this study was to examine protective effects of mussel (Mytilus edulis) oligopeptides supplementation on brain function in d-galactose induced aging mice. Sixty female 8-month-old mice were randomly divided into five groups: vehicle control, d-galactose, and d-galactose combined with 200, 500, 1000 mg/kg mussel oligopeptides. The results showed that mussel oligopeptides could improve cognitive learning and memory ability and protect the hippocampal neurons. In addition, GSH, SOD and GSH-pX activities were increased and MDA level was significantly decreased in mice fed with mussel oligopeptides. It was also found that mussel oligopeptides supplementation prevented d-galactose-induced elevations of iNOS activity and NO production and lactate acid levels in brain. Moreover, PI3K and Akt genes were up-regulated by mussel oligopeptides supplementation. These findings suggest that mussel oligopeptides are able to enhance exercise capacity and protect against oxidative damage caused by d-galactose in aging model mice through regulating oxidation metabolism and PI3K/Akt/NOS signal pathway. Therefore, mussel oligopeptides are good materials for future development of healthcare products to combat age-related brain dysfunction and to improve healthy life span.     

PI3K/AKT信号通路轴在肿瘤上皮细胞间质转化中作用的研究进展

肿瘤上皮间质转化（epithelial-mesenchymal transition,EMT）与肿瘤耐药、侵袭、迁移、发生远处转移等生物学行为密切相关.肿瘤微环境中多种细胞因子及其激活的信号通路均参与细胞的EMT.近年来,越来越多的文献报道PI3K/AKT信号转导途径在肿瘤细胞发生EMT过程中的作用尤为重要.本文将重点讨论PI3K/AKT途径在对E-钙黏蛋白（E-cadherin,E-Cad）的调控及其与其他信号通路协同诱发EMT过程中的作用,并对PI3 K/AKT抑制剂在肿瘤治疗的研究进行回顾.     

基于网络药理学-分子对接探讨益气养阴通络方抗类风湿关节炎的作用机制

[目的]采用网络药理学与分子对接探究益气养阴通络方干预类风湿关节炎（RA）的作用机制。[方法]通过中药系统药理学数据库及分析平台（TCMSP）、本草组鉴（HERB）和文献查阅获得复方活性成分与靶点,采用Genecards、在线人类孟德尔遗传数据库（OMIM）等数据库获得疾病靶点,然后采用数据库计算出益气养阴通络复方成分与疾病的交集靶点。对交集靶点施行功能和通路富集分析,选取益气养阴通络方核心药物靶点与关键化合物施行分子对接。[结果]网络药理学共筛选出益气养阴通络方的83种活性成分和779个潜在靶点,RA相关靶点5 393个,交集靶点465个,其中交集核心靶点9个（分别为SRC、STAT3、MAPK3、MAPK1、HSP90AA1、PIK3R1、GRB2、AKT1、PIK3CA）。富集得出PI3K-AKT、癌症相关及神经活性配体-受体相互作用等通路,其中PI3K-AKT信号通路可能是复方干预RA的关键通路之一。对接计算表明,益气养阴通络方的11种主要活性成分与关键靶点SRC、STAT3、PIK3R1、AKT1均有较稳定的结合,其中与AKT的结合可能最大。[结论]益气养阴通络方通过多成分-...