虎杖结晶4号对大鼠工作心脏功能的影响

虎杖4号结晶(简称PD)对正常大鼠离体工作心脏有明显的正性肌力作用,但不加快心率,PD能对抗普萘洛尔的负性肌力作用。PD还能拮抗苯巴比妥钠所致心力衰竭。     

Polydatin Prevents Calcium Pyrophosphate Crystal-Induced Arthritis in Mice

Background: Polydatin is a stilbenoid with important antioxidant, anti-inflammatory, and immunomodulating properties. The aim of this study was to assess the anti-inflammatory preventive effect of polydatin in the mouse model of acute arthritis induced by calcium pyrophosphate (CPP) crystals. Methods: Acute arthritis was induced by the injection of a suspension of sterile CPP crystals into the ankle joint of Balb/c mice. Animals were randomized to receive polydatin or colchicine (the control drug) according to a prophylactic and a therapeutic protocol. The primary outcome was the variation of ankle swelling obtained after crystal injection and treatment, while histological parameters such as leukocyte infiltration, IL-1ß and CXCL1 levels and tissue expression were considered as secondary outcomes. Results: Prophylactic treatment with PD significantly diminished ankle swelling after 48 h from crystal injection. Secondary outcomes such as leukocyte infiltration, necrosis, edema, and synovitis were also decreased. PD caused a reduction in circulating levels of IL-1ß and CXCL1, as well as their tissue expression. By contrast, the therapeutic administration of PD did not have any beneficial effect. Conclusions: PD can effectively prevent acute inflammatory response to crystals in the mouse model of CPP crystal-induced arthritis. These results suggest that this bioactive compound might be used in the prevention of crystal-induced acute attacks in humans.     

白藜芦醇苷对缺氧性肺动脉高压的作用

目的研究白藜芦醇苷对急性缺氧性肺动脉高压的血流动力学、纤溶系统及肺功能的作用.方法建立猪缺氧性肺动脉高压模型,观察静脉注射白藜芦醇苷前后的血液动力学、肺功能及血中纤溶指标的变化,并与对照组比较.结果用白藜芦醇苷后肺动脉压与用药前比较及与对照组比较均有显著下降(P＜0.01);心搏指数与对照组比较有所增加(P＜0.05);组织型纤溶酶原激活剂(t-PA)与用药前比较及与对照组比较有所增加(P＜0.05),血浆纤溶酶原激活剂抑制物的含量(PAI)与用药前比较及与对照组比较有所下降(P＜0.05).结论白藜芦醇苷可明显降低缺氧引起的肺动脉高压,增加心输出量,增强纤溶系统活性.     

HPLC法测定藜芦中虎杖苷和白藜芦醇的含量

目的：建立HPLC法测定由甲醇加热回流和甲醇超声两种方法提取的藜芦中虎杖苷和白藜芦醇的含量的方法。方法；采用Spherigel C18色谱柱（150mm&;#215;4．6mm，5μm），流动相为四氢呋喃-乙腈-水（40：40：220），流速1．0mL&;#183;min^-1，检测波长303nm。结果：虎杖苷在0～50mg&;#183;L^-1内成良好线性关系，平均回收率甲醇加热回流提取102．4％，RSD1.1％；甲醇超声提取97．2％，RSD1．1％。白藜芦醇在0～100mg&;#183;L^-1内成良好线性关系，平均回收率甲醇加热回流提取96．6％，RSD1．5％；甲醇超声提取96．6％，RSD1．2％。结论：本法可作为藜芦质量控制的手段之一。     

白藜芦醇苷对内毒素休克大鼠肺组织中磷脂酶A2的影响

 目的 探讨白藜芦醇苷(PD)对内毒素休克大鼠肺组织中磷脂酶A₂(PLA₂)的影响。方法 将32只大鼠随机分为4组：单纯手术组(A)、内毒素休克组(B)、PD治疗组(C)和PD预防组（D)。采用酸式滴定法检测肺组织中PLA₂活性，RT-PCR法检测SPLA₂-ⅡA的基因表达。结果 PD可抑制内毒素所致的PLA₂活性增高及sPLA₂-ⅡAmRNA表达增强，减轻肺损伤的程度，并且预防性应用的效果优于治疗效果。结论 PD可通过抑制PLA2的活性增高和基因表达增强，从而对内毒素休克大鼠的肺脏具有保护作用。PD可能是一种PLA₂抑制剂。     

虎杖苷对慢性阻塞性肺疾病大鼠PI3K/AKT/mTOR通路以及气道炎症的影响

目的 构建慢性阻塞性肺疾病（COPD）大鼠模型,探讨虎杖苷对COPD大鼠PI3K/AKT/mTOR通路以及气道炎症的影响。方法 100只Wistar大鼠随机分为对照组、模型组、地塞米松（0.2 mg/kg,阳性药）组和虎杖苷低、高剂量（30、60 mg/kg）组,每组20只。除对照组外,其他组熏香烟加气管注射内毒素法制备COPD模型,COPD造模前1 d开始ig给药,每天1次,持续30 d。ELISA法检测支气管肺泡灌洗液（BALF）中肿瘤坏死因子（TNF）-α和白细胞介素（IL）-6水平;RSE3020肺功能检测仪测定用力肺活量（FVC）、第1秒用力呼气容积（FEV₁）、呼气峰流速（PEF）;取肺组织4%甲醛固定后制作切片,HE染色,并进行肺组织损伤病理评分;Western blotting检测肺组织PI3K、AKT、mTOR蛋白表达。结果 虎杖苷高、低剂量组大鼠BALF中TNF-α和IL-6表达水平、肺组织损伤病理评分以及PI3K、AKT和mTOR蛋白表达均显著低于模型组（P<0.01）;虎杖苷高、低剂量组大鼠FVC、FEV1、PEF肺功能指标显著高于模型组（P<0.01）。结论 虎杖苷可以抑制COPD大鼠PI3K/AKT/mTOR通路,抑制气道炎症,发挥肺损伤保护作用。     

虎杖甙对兔肠缺血—再灌注损伤的保护作用

目的：观察虎杖甙（ＰＤ）对兔肠缺血再灌注损伤（ＩＲＩ）的保护作用。方法：采用兔ＩＲＩ模型与经ＰＤ处理的兔ＩＲＩ模型和正常对照组作比较。结果：ＰＤ处理组动物血压降低的程度比ＩＩＲＩ组轻，平均存活时间明显延长。再灌注后２．５小时，ＰＤ处理组动物红细胞压积的升高程度明显低于ＩＩＲＩ组；ＰＤ还可以防止小肠壁和粘膜重量减轻，使其中丙二醛含量升高程度降低。结论：ＰＤ可减轻肠缺血再灌注时肠道的损害和血液浓缩，进而防止血压降低，延长动物的平均存活时间。     

Ameliorative effect of polydatin on oxidative stress‐mediated testicular damage by chronic arsenic exposure in rats

Arsenic causes lipid peroxidation leading to alterations in antioxidant status in organisms. In this study, the reproductive effects of chronic exposure to arsenic and the protective effects of polydatin (PD) were evaluated in 35 Wistar male rats, which were divided equally into five groups. The control group received a normal diet and tap water, arsenic (100 mg l^?1, approximately 1/50 of oral LD₅₀) was given via drinking water to experimental groups except control group, and PD was orally given to the other groups at dose of 50, 100 and 200 mg kg^?1 for 60 days. Arsenic administration decreased sperm motility, glutathione level, superoxide dismutase and catalase activities in testicular tissue of rats. In contrast, malondialdehyde level and DNA damage were found to be high levels in arsenic‐treated group. Histopathologically, it was observed that decreased sperm concentration and degeneration of Sertoli cells in testicular tissue. PD administration, partially 200 mg kg^?1, reversed arsenic‐induced lipid peroxidation, DNA damage, antioxidant enzyme activity and cell integrity in testis of rats. These results demonstrate that PD decreases arsenic‐induced lipid peroxidation, enhances the antioxidant defence mechanism and regenerates tissue damage in testis of rats.     

白藜芦醇苷对脑缺血再灌注损伤小鼠血脑屏障的 保护作用研究

目的:观察白藜芦醇苷（PD）对脑缺血再灌注损伤小鼠血脑屏障的保护作用及对紧密连接蛋白的影响。方法:CD-1 小鼠 （102 只）应用线栓法制作短暂性大脑中动脉闭塞（tMCAO）模型。随机将实验动物分成4 组:假手术组（28 只）、缺血再灌注 组（28只）、白藜芦醇苷低剂量组（30 mg/kg,18只）,白藜芦醇苷高剂量组（60 mg/kg,28只）。于缺血再灌注后24 h 进行行为学评 分、TTC 染色、干湿重测定、伊文思蓝染色,应用Western 印迹、免疫荧光检测内皮细胞标志物血小板内皮细胞黏附分子-1（CD- 31）、紧密连接蛋白闭锁小带蛋白-1（ZO-1）、咬合蛋白（Occludin）、闭合蛋白-5（Claudin-5）的表达情况。结果:（1）与缺血再灌注 组相比,白藜芦醇苷高剂量组改善了缺血再灌注小鼠行为学评分、减少了脑梗死体积[（33.76%± 13.27%）vs.（57.47%±9.53%）, P<0.05]、减轻了缺血再灌注小鼠脑水肿程度[（75.62%±7.95%）vs.（85.72%±6.20%）,P<0.05]、降低了伊文思蓝渗出量[（1.49±0.47） vs.（2.13±0.44）,P<0.05]。（2）Western印迹结果显示白藜芦醇苷上调了ZO-1、Occludin、Claudin-5（均P<0.05）的表达水平。（3）免 疫荧光结果显示:白藜芦醇苷组上调了CD-31 在皮层缺血半暗带区的表达,且可见微血管形态相较缺血再灌注组更加光滑、完 整,同时白藜芦醇苷减少了ZO-1、Claudin-5 的破坏。结论:白藜芦醇苷的干预对缺血再灌注损伤小鼠起到了保护血脑屏障的作 用,上调了紧密连接蛋白ZO-1、Occludin、Claudin-5 的表达水平。     

虎杖苷减轻大鼠创伤性颅脑损伤后的肠损伤：基于激活Sirt1介导的SOD2和HMGB1去乙酰化抑制氧化应激和炎症反应

目的 探讨虎杖苷（PD）对创伤性颅脑损伤（TBI）后大鼠肠粘膜损伤的保护作用及其机制。方法 采用液压冲击损伤（FPI）方法用SD大鼠复制TBI动物模型,分别在TBI后12、24、48、72 h收集标本,每组5只;另将大鼠随机分为Sham组（n=5,除了FPI操作其他均进行）、TBI+NS组（n=5,TBI后给予和PD组等容积的生理盐水）和TBI+PD组（n=5,TBI后给予30 mg/kg的PD）。记录大鼠体质量和粪便含水量,观察空肠组织病理,检测D-乳酸（D-LAC）、二胺氧化酶（DAO）、ZO-1和claudin-5水平,测定活性氧自由基（ROS）、过氧化脂质（LPO）和超氧化物岐化酶2（SOD2）含量,检测空肠促炎因子表达水平,检测Sirt1活性,SOD2和HMGB1乙酰化水平。结果 TBI大鼠体质量下降,粪便含水量减少,血清D-LAC、DAO水平进行性升高（P<0.05）。空肠组织损伤加重,ZO-1、claudin-5、SOD2、Sirt1活性明显下降（P<0.05）,LPO、ROS、促炎细胞因子、SOD2和HMGB1乙酰化水平增高（P< 0.05）;与TBI+NS组相比,TBI+PD组大鼠体质量恢复,粪便含水量增加,D-LAC和DAO水平降低（P<0.05）,空肠组织病理损伤减轻,ZO-1、claudin-5、SOD2表达水平、Sirt1活性增加,ROS、LPO、促炎细胞因子、SOD2和HMGB1乙酰化水平降低（P<0.05）。结论 PD通过激活Sirt1介导的SOD2和HMGB1去乙酰化减轻氧化应激及炎症反应,改善TBI大鼠肠粘膜损伤。