咪唑安定对氯胺酮诱导的大鼠脑扣带回内c-fos表达的影响

目的观察咪唑安定对氯胺酮诱导大鼠扣带回c-fos基因表达的影响。方法SD大鼠20只，随机分为对照组、咪唑安定组、氯胺酮组和咪唑安定＋氯胺酮Ⅰ、Ⅱ组（MKI、Ⅱ组），每组4只。MKⅠ组、Ⅱ组分别腹腔注射眯唑安定2．5、5mg／kg，5min后，腹腔注射100mg／kg氯胺酮。对照组、氯胺酮组、眯唑安定组分别腹腔注射生理盐水、100mg／kg氯胺酮、咪唑安定5mg／kg。2h后，取脑，冰冻切片，进行Fos蛋白免疫组织化学染色。结果氯胺酮组Fos蛋白免疫组织化学阳性神经元（FLIN）明显多于对照组、咪唑安定组（P〈0．01）；MKⅠ组、Ⅱ组FLIN均少于氯胺酮组（P〈0．01），而且MKII组明显少于MKI组（P〈0．01）。结论咪唑安定可能通过剂量依赖的抑制氯胺酮诱导的c-fos在扣带回的表达，减轻或消除氯胺酮的精神副作用。     

阿托伐他汀对ApoE基因敲除小鼠动脉粥样硬化病变中TRPC5表达的影响

目的:观察载脂蛋白E基因敲除(Apo E-/-)小鼠动脉粥样硬化斑块形成过程中血管平滑肌细胞瞬时受体电位通道5(TRPC5)蛋白的表达变化,以及阿托伐他汀药物干预对TRPC5的影响并探讨其作用机制。方法:将40只6周龄雄性Apo E-/-小鼠随机分为模型组和他汀干预组,高脂饲料喂养建立动脉粥样硬化模型。他汀干预组给予阿托伐他汀(20 mg·kg-1·d-1)灌胃,模型组给予等量生理盐水灌胃。20只同龄雄性野生型C57BL/6J小鼠给予普通饲料喂养作为正常对照组。各组小鼠分别喂养至20和30周龄,分别取10只取血并处死。取主动脉根部做石蜡切片行HE染色形态学观察,测量并计算斑块相对面积;免疫组织化学染色检测各组小鼠TRPC5蛋白表达变化。取胸腹段主动脉行实时荧光定量PCR,检测主动脉中TRPC5通道蛋白mRNA的表达水平。结果:与模型组相比,阿托伐他汀干预组的血脂明显下降,斑块总面积明显减小,TRPC5蛋白水平及mRNA含量明显下降;30周龄模型组的TRPC5蛋白表达稍高于20周龄模型组,但差异无统计学意义;30周干预组较20周干预组相比,TRPC5水平有降低趋势且差异有统计学意义。结论:阿托伐他汀可能通过下调TRPC5蛋白表达从而延缓动脉粥样硬化进程。     

表达PD-L1/PD-L2的人胎盘间充质干细胞对外周血T细胞分泌IL-17的拮抗作用

目的 探讨程序性死亡因子配体1(PD-L1)和PD-L2在人胎盘源性间充质干细胞(hPMSCs)上表达对外周血T细胞分泌IL-17的影响.方法 应用酶消化法分离人胎盘间充质干细胞(hPMSCs),并进行表型及分化鉴定;RT-PCR、激光扫描共聚焦显微镜技术(LSCM)及流式细胞术(FCM)检测hPMSCs上PD-L1及PD-L2的表达;应用化学合成的PD-L1 siRNA、PD-L2 siRNA沉默hPMSCs上PD-L1及PD-L2表达;密度梯度离心法分离纯化人外周血T细胞;细胞胞内因子染色法分析沉默PD-L1或PD-L2后hPMSCs对PMA活化的T细胞分泌IL-17的影响.结果 除PD-L1外,hPMSCs高表达PD-L2;siRNA能够有效阻断PD-L1和PD-L2在hPMSCs上的表达;胞内染色结果显示,hPMSCs能够上调T细胞IL-17的分泌,阻断PD-L1或PD-L2后,T细胞IL-17的分泌被进一步上调,且PD-L1和PD-L2具有叠加作用.结论 PD-L1和PD-L2在hPMSCs上表达,可拮抗hPMSCs刺激外周血T细胞分泌IL-17的作用.     

Preventive Effect of Total Flavones of Choerospondias axillaries on Ischemia/Reperfusion-Induced Myocardial Infarction-Related MAPK Signaling Pathway

Choerospondias axillaris (Guangzao) is a medicinal plant used in Mongolia, and its fruit is commonly used for the treatment of cardiovascular diseases in clinic. The constituents responsible for this effect are always conceded to be the total flavonoids of C. axillaries (TFC). The present study was to evaluate the preventive effect of TFC on acute myocardial infarction induced by ischemia/reperfusion (I/R) in rats and the possible signaling pathway involved. The model of myocardial I/R was caused by occlusion of the left anterior descending coronary artery for 30 min followed by reperfusion for 2 h. Cardiac dysfunction, infarct size, pathologic histology and apoptosis were examined. Heart tissues were homogenized for biochemistry assays and Western blots analysis. The results indicated that pretreatment with TFC strongly improved cardiac function, obviously reduced heart pathologic lesion in I/R rat hearts. TFC also could protect the heart from I/R injury by increasing the levels of catalase, glutathione peroxidase and superoxide dismutase in heart homogenate, and decreasing that of malondialdehyde level. These beneficial effects were associated with the decrease in TUNEL-positive nuclear staining, Bax and caspase-3 levels, and the increase in Bcl-2 expression. Moreover, TFC counteracted the I/R-induced decreased activation of p38 mitogen-activated protein kinase (MAPK) and Jun N-terminal kinase. These data suggested that TFC improved I/R-induced myocardium impairment via anti-oxidative and anti-apoptotic activities, and this beneficial effects were intervened by MAPK signaling pathway.     

HU-308与nHA/PCL电纺丝膜对小鼠前成骨细胞生物学性能的影响

目的 探讨不同浓度HU-308与纳米羟基磷灰石与聚己内酯(nHA/PCL)电纺丝膜对小鼠前成骨细胞MC3T3-E1生物学性能的影响。方法 将静电纺丝膜制成圆形薄膜置于细胞培养板底部,使用含不同浓度HU-308(0、10^-10、10^-9、10^-8、10^-7、10^-6 mol/L)的培养液培养MC3T3-E1细胞;培养1、4、7 d,进行CCK-8检测增殖检测及碱性磷酸酶(ALP)活性的检测;Real Time-PCR检测培养7 d时细胞成骨相关基因OPG mRNA表达,观察培养24 h细胞骨架的形态。结果 培育1、4、7 d后,与对照组相比,各实验组间细胞增殖活性增强,P<0.05;随着培育时间的延长,同一实验组细胞增殖活性逐渐增强,P<0.05。随着培育时间的延长,同一实验组MC3T3-E1细胞中的ALP活性增加,P＜0.05。在相同时间点,与对照组比较,低浓度HU-308(10^-10 mol/L、10^-9 mol/L)促进OPG mRNA的表达,P＜0.05 ;高浓度HU-308对OPG mRNA的表达起抑制作用,且浓度越高抑制作用越明显,P＜0.05。成骨细胞随药物浓度的加大,细胞铺展面积有增大趋势且细胞骨架结构更加清晰,尤以10^-6 mol/L浓度组成骨细胞伸展范围最广。结论 HU-308和nHA/PCL电纺丝膜可促进MC3T3-E1细胞的黏附、增殖和分化。     

烟台地区病毒性脑炎病毒分离与病原学分析

目的了解烟台地区病毒性脑炎病原谱及其基因特征。方法采集烟台地区病毒性脑炎患者脑脊液46份及粪便标本10份,通过细胞培养分离病毒,RT-PCR扩增肠道病毒VP1区并测序,进行基因序列分析。结果从46例病毒性脑炎患者脑脊液标本中分离到11株病毒,分离率为23.91%,10份粪便标本中分离病毒5株。16株病毒经鉴定7株为肠道病毒,其中EV71型4株。EV71与其他地区流行株VP1区序列差异较小。结论烟台市病毒性脑炎以肠道病毒为主,有EV71型流行,与其他地区流行株相比,EV71型VP1区基因变异较小。     

Increased Neuronal Apoptosis in Medial Prefrontal Cortex is Accompanied with Changes of Bcl-2 and Bax in a Rat Model of Post-Traumatic Stress Disorder

Post-traumatic stress disorder (PTSD) is an anxiety disorder caused by traumatic experience, which affects a patient’s quality of life and social stability. The objective of this study was to determine the apoptosis-related genes B-cell lymphoma 2 (Bcl-2) and BCL2-associated X (Bax) expressions and medial prefrontal cortex (mPFC) neuronal apoptosis after PTSD in rat model and therefore to provide experimental evidence to reveal PTSD pathogenesis. The single-prolonged stress (SPS) method was used to set up the rat PTSD models. Chemiluminescence was used to determine serum corticosterone levels. Neuronal apoptosis was detected using transmission electron microscopy, Hoechst staining, and terminal deoxynucleotidyl transferase dUTP nick end labeling staining. Immunohistochemistry, immunofluorescence, RT-PCR, and Western blot were used to detect the expressions of Bcl-2 and Bax protein in mPFC. Our results showed an increased mPFC neuronal apoptosis after SPS stimulation. The number of apoptotic cells peaked on day 7. The expressions of Bcl-2 and Bax peaked on days 4 and 7. The Bcl-2/Bax ratio elevated on days 1 and 4 but decreased markedly on day 7. These results indicated that SPS stimulation increased the number of apoptotic neurons, up-regulated the expressions of Bcl-2 and Bax, and altered the Bcl-2/Bax ratio in the mPFC of PTSD rats.     

基于多源信息融合的中药质量标志物与质量评价研究模式

中药具有成分复杂性、功效多样性、成分间相互作用难以预测性的特点。因此,多学科交叉、多源信息融合的评价模式是中药质量标准创新性的研究思路。提出建立多源信息融合的中药质量标志物研究模式。根据中药质量整体性和功效特异性的属性,以质量标志物为核心,通过多源信息融合方法,整合传统的中药性状鉴别,融合有机成分和无机元素的多维物质基础分析方法,从影响药材质量的多维变量体系中辨识真正对中药功效产生矢量贡献的质量标识物,量化其药效贡献度,构建体现中药质量整体性和功效特异性的全方位质量评价体系。     

人工智能辅助手术规划系统在个体化全髋关节假体精准植入中的应用

目的 与传统二维胶片模板测量术前计划比较,探讨人工应用智能辅助三维数字化手术规划系统在个体化全髋关节置换术（total hip arthroplasty,THA）假体植入中应用的准确性。方法 回顾性分析88例行单侧THA手术病人的临床资料,其中传统模板组（44例）,人工智能组（44例）,记录比较两组在假体型号大小选择、植入位置、患侧偏心距、双下肢等长重建等方面的差异。结果 人工智能组髋臼杯和股骨柄假体型号的预测吻合率分别为95.5%、88.6%,均高于传统模板组的75.0%、65.9%,差异有统计学意义（P＜0.05）。人工智能组手术后偏心距和肢体长度的差值分别为（4.73±2.97） mm、（3.42±2.32） mm,均较传统模板组更小,差异有统计学意义（P＜0.05）。结论 人工智能辅助手术规划系统对人工髋关节假体型号的预测、患侧肢体偏心距的恢复、双下肢等长重建更加精准。