Barrier function of porcine choroid plexus epithelial cells is modulated by cAMP-dependent pathways in vitro

In the present paper, we demonstrate that the barrier properties of primary cultured epithelial cells isolated from porcine choroid plexus are regulated by cAMP-dependent signal transduction pathways in vitro. Triggering cAMP-connected cascades in cell layers grown on permeable filters with cAMP-analogues or forskolin led to a significant increase of transepithelial electrical resistances and a pronounced reduction in the permeation rate of a 4 kDa-dextran probe. In dose-response experiments using the cAMP-analogue 8-(4-chlorophenylthio)-cAMP transepithelial electrical resistances were observed to increase above a threshold concentration ranging between 10(-5.5) and 10(-5) M. Additional impedance studies performed with confluent cell layers grown on gold-film electrodes revealed that the observed changes in transepithelial resistances and presumably also in macromolecular permeation rates were not entirely caused by a reinforcement of intercellular junctions but also contained contributions from changes in the cell-substrate adhesion pattern. These inherent contributions to the electrical resistance and macromolecular permeability are caused by a restricted diffusion pathway between basal plasma membrane and culture substrate that have to be considered in data analysis, especially when leaky cell layers on filter substrates with low pore densities are used.     

镀银导电纤维的制备和性能

对短切聚酯纤维进行化学镀银,制备了用于导电高分子材料的导电填料,探讨了氨水浓度、装载量及稳定剂对纤维化学镀银的影响。实验表明,φ=0.10的氨水有利于化学镀银;通过调整装载量,可提高纤维的增重量率和硝酸银的利用率;稳定剂的加入可阻止镀液自分解,但对包覆层的均匀性和致密性有影响。电性能测试表明,镀银纤维的体积电阻率可达3.35×1-0 3Ω.cm,以其作为导电橡胶填料,当含量为w=0.40时,其电阻率为1.54×1-0 1Ω.cm。     

在美欧非洲用中医治疗HIV、AIDS的体会

中医药具有纯天然、很少毒副作用和抗药性,并价廉适应面广特点,据笔者近10多年在美欧非洲几十个国家和地区的千余例HIV、AIDS病人的临床实践证实,中医中药、针灸对治疗HIV、AIDS疗效显著。     

试析He-Ne激光沿经络自动照射仪的应用

本文介绍He-Ne激光沿经络自动照射仪的结构、特点,分析了激光与组织相互作用的物理效应和生物效应,提出了该仪器在针灸临床中的应用。     

"双固一通"针刺法对糖尿病大鼠血浆神经肽Y的影响

目的观测"双固一通"针剌法针刺对糖尿病大鼠血浆NPY的影响.方法180～220g Wistar大鼠73只,13只为正常对照(A组),另60只行链脲左菌素腹腔注射造模,造模成功的大鼠随机分为模型组(B组)、"一通"针刺治疗组(C组)、"双固一通"针刺治疗组(D组)和常规针刺治疗组(E组),治疗2个疗程后用放射免疫分析法检测各组血浆胰岛素和NPY,用血糖仪检测各组血糖.结果C组使糖尿病大鼠血糖水平有降低趋势,NPY水平上升,但与模型组比较,无显著性差异(P＞0.05).D组和E组均明显降低糖尿病大鼠的血糖水平(P＜0.05),使糖尿病大鼠升高的血浆NPY水平降低(P＜0.05),对降低的胰岛素水平有升高的趋势,但与治疗前相比,无显著性差异(P＞0.05),在降低NPY水平方面,D组效果更好(P＜0.05).结论双固一通针刺法降低血糖的同时,使糖尿病大鼠的NPY水平降低,这可能是其防治糖尿病血管并发症的机制之一.     

针刺治疗对血脂影响的观察

目的 :观察醒脑开窍法针刺治疗动脉粥样硬化对高脂血症的影响。方法 :选取中风合并高血压患者 34例 ,另取年龄、性别相同其它条件相当的健康人群 34例作对照 ,观察针刺前两组 HDL、TC的差别及治疗组治疗前后的变化。结果 :治疗组治疗前与对照组相比 ,HDL - C明显降低 (P <0 .0 1) ,TC显著升高 (P <0 .0 1) ;治疗后 ,治疗组 HDL - C显著升高 (P <0 .0 1) ,TC明显降低 (P <0 .0 1)。结论 :醒脑开窍法针刺治疗中风合并高血压者可调节血脂的变化 ,从而起到治疗该病的作用。     

基于人工智能的高血压性脑出血医疗文本信息自动识别系统

目的 构建基于人工智能的高血压性脑出血医疗文本信息自动识别系统,快速识别和分析患者临床信息,高效地输出正确的诊疗方案。方法 基于国内外最新高血压性脑出血诊疗指南,经多位高年资神经外科医生和专业人工智能团队共同讨论,构建基于语言表征模型和专家模块的高血压性脑出血医疗文本信息自动识别及决策系统（即H系统）。随后将收集到的高血压性脑出血病例分为训练集、测试集和验证集,以数据库中病例的真实治疗方案为金标准,先总体评价H系统的准确性,再将其与神经外科医生进行对比,分析H系统的判读效率。结果 在测试集中,H系统所输出的治疗方案的准确率为94.0%（91.5%~96.5%）,特异度为91.8%（86.3%~97.3%）,灵敏度为95.5%（89.3%~98.2%）,曲线下面积（area under the curve,AUC）值为0.936（0.922~0.950）（P=0.000）;在验证集中,H系统所输出的治疗方案的准确率为93.3%（89.5%~97.1%）,特异度为 89.9%（83.4%~96.4%）,灵敏度为95.8%（92.3%~99.3%）,AUC值为0.928（0.891~0.966）（P=0.000）。在处理同样的70例病例时,H系统用时（334.60±4.46）s,而神经外科医生用时（12 550.28±95.45）s;在50 min内,H系统处理的病例数为（383±3）例,而神经外科医生处理的病例数为（11±4）例。结论 本研究所构建的H系统能够对高血压性脑出血患者的急诊病例进行自动识别和分析,并快速输出准确的诊疗方案,可协助医生对高血压脑出血进行急诊诊疗。     

In Vitro and In Vivo Effects of Nonsteroidal Anti-inflammatory Drugs and Aspirin on Rabbit Esophageal Epithelium

BackgroundGastroesophageal reflux disease has a high incidence of 23%, with 29% of those with gastroesophageal reflux disease consuming nonsteroidal anti-inflammatory drugs. There are insufficient data concerning the effects of nonsteroidal anti-inflammatory drugs on the esophageal tissue. We aimed to examine the effects of well-known nonsteroidal anti-inflammatory drugs using electrophysiologic criteria on the rabbit esophageal epithelium.MethodsEsophageal epithelium mounted on Ussing chambers enabled in vitro investigation of the electrophysiological properties. Doses of 1 mg/mL, 2.5 mg/mL, 5 mg/mL ibuprofen, naproxen, and aspirin were dissolved in dimethyl sulfoxide and added to the luminal side. Esophagi were cannulated from both sides for the administration of high-dose ibuprofen in vivo, and the potential difference was monitored.ResultsIbuprofen and aspirin inhibited tissue transport functions in a dose-dependent manner. pH 4 acid and 0.1 mg/mL ibuprofen alone were not harmful; however, the combination of these agents had an additive and significance effect: 78% decrease in the potential difference and 85% decrease in the short-circuited current (Isc). The change in the potential difference in the in vivo experiments (5 mg/mL ibuprofen) was similar (52 ± 7% decrease) with in vitro experiments in the first 30 minutes.ConclusionNonsteroidal anti-inflammatory drugs were harmful to the rabbit esophageal epithelium in both the in vitro and in vivo experiments. Even though aspirin and ibuprofen affected the transport mechanisms of the esophageal epithelium, the dose-dependent decrease of tissue potential difference and Isc with ibuprofen was more pronounced than those with aspirin. The combination of harmless doses of ibuprofen and acid demonstrated that even low acidic conditions can create a disruptive environment.     

火针配合拔罐的临床应用概况

综述近10余年来火针配合拔罐的临床应用概况。火针配合拔罐在皮肤科、骨伤科及外科得到了广泛的应用。今后可进一步提高其临床科研的设计水平,以充分体现火针配合拔罐的优势。     

氦-氖激光耳穴照射加针灸治疗寻常型痤疮36例

观察氦 氖激光耳穴照射加针灸治疗寻常型痤疮的临床疗效 ,6 8例寻常型痤疮患者随机分为观察组 (36例 ,以氦 氖激光耳穴照射加针灸治疗 )和对照组 (32例 ,单纯针灸治疗 )。结果 :观察组治愈率为 77 8% ,对照组为 4 6 9% ,P <0 0 5。提示氦 氖激光耳穴照射加针灸治疗寻常型痤疮疗效确切。